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1082 lines
30 KiB
1082 lines
30 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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* ispstat.c |
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* |
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* TI OMAP3 ISP - Statistics core |
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* |
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* Copyright (C) 2010 Nokia Corporation |
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* Copyright (C) 2009 Texas Instruments, Inc |
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* |
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* Contacts: David Cohen <[email protected]> |
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* Laurent Pinchart <[email protected]> |
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* Sakari Ailus <[email protected]> |
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*/ |
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|
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#include <linux/dma-mapping.h> |
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#include <linux/slab.h> |
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#include <linux/timekeeping.h> |
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#include <linux/uaccess.h> |
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|
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#include "isp.h" |
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|
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#define ISP_STAT_USES_DMAENGINE(stat) ((stat)->dma_ch != NULL) |
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|
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/* |
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* MAGIC_SIZE must always be the greatest common divisor of |
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* AEWB_PACKET_SIZE and AF_PAXEL_SIZE. |
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*/ |
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#define MAGIC_SIZE 16 |
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#define MAGIC_NUM 0x55 |
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|
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/* HACK: AF module seems to be writing one more paxel data than it should. */ |
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#define AF_EXTRA_DATA OMAP3ISP_AF_PAXEL_SIZE |
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|
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/* |
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* HACK: H3A modules go to an invalid state after have a SBL overflow. It makes |
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* the next buffer to start to be written in the same point where the overflow |
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* occurred instead of the configured address. The only known way to make it to |
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* go back to a valid state is having a valid buffer processing. Of course it |
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* requires at least a doubled buffer size to avoid an access to invalid memory |
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* region. But it does not fix everything. It may happen more than one |
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* consecutive SBL overflows. In that case, it might be unpredictable how many |
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* buffers the allocated memory should fit. For that case, a recover |
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* configuration was created. It produces the minimum buffer size for each H3A |
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* module and decrease the change for more SBL overflows. This recover state |
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* will be enabled every time a SBL overflow occur. As the output buffer size |
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* isn't big, it's possible to have an extra size able to fit many recover |
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* buffers making it extreamily unlikely to have an access to invalid memory |
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* region. |
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*/ |
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#define NUM_H3A_RECOVER_BUFS 10 |
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|
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/* |
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* HACK: Because of HW issues the generic layer sometimes need to have |
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* different behaviour for different statistic modules. |
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*/ |
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#define IS_H3A_AF(stat) ((stat) == &(stat)->isp->isp_af) |
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#define IS_H3A_AEWB(stat) ((stat) == &(stat)->isp->isp_aewb) |
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#define IS_H3A(stat) (IS_H3A_AF(stat) || IS_H3A_AEWB(stat)) |
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|
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static void __isp_stat_buf_sync_magic(struct ispstat *stat, |
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struct ispstat_buffer *buf, |
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u32 buf_size, enum dma_data_direction dir, |
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void (*dma_sync)(struct device *, |
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dma_addr_t, unsigned long, size_t, |
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enum dma_data_direction)) |
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{ |
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/* Sync the initial and final magic words. */ |
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dma_sync(stat->isp->dev, buf->dma_addr, 0, MAGIC_SIZE, dir); |
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dma_sync(stat->isp->dev, buf->dma_addr + (buf_size & PAGE_MASK), |
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buf_size & ~PAGE_MASK, MAGIC_SIZE, dir); |
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} |
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|
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static void isp_stat_buf_sync_magic_for_device(struct ispstat *stat, |
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struct ispstat_buffer *buf, |
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u32 buf_size, |
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enum dma_data_direction dir) |
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{ |
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if (ISP_STAT_USES_DMAENGINE(stat)) |
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return; |
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|
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__isp_stat_buf_sync_magic(stat, buf, buf_size, dir, |
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dma_sync_single_range_for_device); |
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} |
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|
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static void isp_stat_buf_sync_magic_for_cpu(struct ispstat *stat, |
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struct ispstat_buffer *buf, |
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u32 buf_size, |
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enum dma_data_direction dir) |
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{ |
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if (ISP_STAT_USES_DMAENGINE(stat)) |
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return; |
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|
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__isp_stat_buf_sync_magic(stat, buf, buf_size, dir, |
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dma_sync_single_range_for_cpu); |
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} |
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|
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static int isp_stat_buf_check_magic(struct ispstat *stat, |
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struct ispstat_buffer *buf) |
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{ |
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const u32 buf_size = IS_H3A_AF(stat) ? |
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buf->buf_size + AF_EXTRA_DATA : buf->buf_size; |
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u8 *w; |
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u8 *end; |
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int ret = -EINVAL; |
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|
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isp_stat_buf_sync_magic_for_cpu(stat, buf, buf_size, DMA_FROM_DEVICE); |
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|
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/* Checking initial magic numbers. They shouldn't be here anymore. */ |
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for (w = buf->virt_addr, end = w + MAGIC_SIZE; w < end; w++) |
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if (likely(*w != MAGIC_NUM)) |
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ret = 0; |
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|
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if (ret) { |
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dev_dbg(stat->isp->dev, |
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"%s: beginning magic check does not match.\n", |
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stat->subdev.name); |
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return ret; |
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} |
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|
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/* Checking magic numbers at the end. They must be still here. */ |
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for (w = buf->virt_addr + buf_size, end = w + MAGIC_SIZE; |
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w < end; w++) { |
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if (unlikely(*w != MAGIC_NUM)) { |
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dev_dbg(stat->isp->dev, |
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"%s: ending magic check does not match.\n", |
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stat->subdev.name); |
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return -EINVAL; |
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} |
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} |
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|
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isp_stat_buf_sync_magic_for_device(stat, buf, buf_size, |
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DMA_FROM_DEVICE); |
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|
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return 0; |
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} |
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|
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static void isp_stat_buf_insert_magic(struct ispstat *stat, |
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struct ispstat_buffer *buf) |
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{ |
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const u32 buf_size = IS_H3A_AF(stat) ? |
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stat->buf_size + AF_EXTRA_DATA : stat->buf_size; |
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|
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isp_stat_buf_sync_magic_for_cpu(stat, buf, buf_size, DMA_FROM_DEVICE); |
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|
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/* |
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* Inserting MAGIC_NUM at the beginning and end of the buffer. |
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* buf->buf_size is set only after the buffer is queued. For now the |
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* right buf_size for the current configuration is pointed by |
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* stat->buf_size. |
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*/ |
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memset(buf->virt_addr, MAGIC_NUM, MAGIC_SIZE); |
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memset(buf->virt_addr + buf_size, MAGIC_NUM, MAGIC_SIZE); |
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|
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isp_stat_buf_sync_magic_for_device(stat, buf, buf_size, |
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DMA_BIDIRECTIONAL); |
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} |
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|
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static void isp_stat_buf_sync_for_device(struct ispstat *stat, |
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struct ispstat_buffer *buf) |
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{ |
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if (ISP_STAT_USES_DMAENGINE(stat)) |
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return; |
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|
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dma_sync_sg_for_device(stat->isp->dev, buf->sgt.sgl, |
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buf->sgt.nents, DMA_FROM_DEVICE); |
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} |
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|
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static void isp_stat_buf_sync_for_cpu(struct ispstat *stat, |
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struct ispstat_buffer *buf) |
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{ |
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if (ISP_STAT_USES_DMAENGINE(stat)) |
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return; |
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|
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dma_sync_sg_for_cpu(stat->isp->dev, buf->sgt.sgl, |
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buf->sgt.nents, DMA_FROM_DEVICE); |
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} |
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|
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static void isp_stat_buf_clear(struct ispstat *stat) |
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{ |
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int i; |
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|
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for (i = 0; i < STAT_MAX_BUFS; i++) |
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stat->buf[i].empty = 1; |
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} |
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|
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static struct ispstat_buffer * |
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__isp_stat_buf_find(struct ispstat *stat, int look_empty) |
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{ |
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struct ispstat_buffer *found = NULL; |
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int i; |
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|
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for (i = 0; i < STAT_MAX_BUFS; i++) { |
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struct ispstat_buffer *curr = &stat->buf[i]; |
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|
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/* |
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* Don't select the buffer which is being copied to |
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* userspace or used by the module. |
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*/ |
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if (curr == stat->locked_buf || curr == stat->active_buf) |
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continue; |
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|
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/* Don't select uninitialised buffers if it's not required */ |
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if (!look_empty && curr->empty) |
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continue; |
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|
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/* Pick uninitialised buffer over anything else if look_empty */ |
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if (curr->empty) { |
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found = curr; |
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break; |
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} |
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|
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/* Choose the oldest buffer */ |
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if (!found || |
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(s32)curr->frame_number - (s32)found->frame_number < 0) |
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found = curr; |
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} |
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|
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return found; |
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} |
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|
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static inline struct ispstat_buffer * |
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isp_stat_buf_find_oldest(struct ispstat *stat) |
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{ |
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return __isp_stat_buf_find(stat, 0); |
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} |
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|
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static inline struct ispstat_buffer * |
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isp_stat_buf_find_oldest_or_empty(struct ispstat *stat) |
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{ |
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return __isp_stat_buf_find(stat, 1); |
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} |
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|
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static int isp_stat_buf_queue(struct ispstat *stat) |
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{ |
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if (!stat->active_buf) |
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return STAT_NO_BUF; |
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|
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ktime_get_ts64(&stat->active_buf->ts); |
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|
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stat->active_buf->buf_size = stat->buf_size; |
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if (isp_stat_buf_check_magic(stat, stat->active_buf)) { |
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dev_dbg(stat->isp->dev, "%s: data wasn't properly written.\n", |
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stat->subdev.name); |
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return STAT_NO_BUF; |
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} |
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stat->active_buf->config_counter = stat->config_counter; |
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stat->active_buf->frame_number = stat->frame_number; |
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stat->active_buf->empty = 0; |
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stat->active_buf = NULL; |
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|
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return STAT_BUF_DONE; |
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} |
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|
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/* Get next free buffer to write the statistics to and mark it active. */ |
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static void isp_stat_buf_next(struct ispstat *stat) |
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{ |
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if (unlikely(stat->active_buf)) |
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/* Overwriting unused active buffer */ |
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dev_dbg(stat->isp->dev, |
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"%s: new buffer requested without queuing active one.\n", |
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stat->subdev.name); |
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else |
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stat->active_buf = isp_stat_buf_find_oldest_or_empty(stat); |
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} |
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|
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static void isp_stat_buf_release(struct ispstat *stat) |
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{ |
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unsigned long flags; |
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|
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isp_stat_buf_sync_for_device(stat, stat->locked_buf); |
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spin_lock_irqsave(&stat->isp->stat_lock, flags); |
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stat->locked_buf = NULL; |
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spin_unlock_irqrestore(&stat->isp->stat_lock, flags); |
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} |
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|
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/* Get buffer to userspace. */ |
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static struct ispstat_buffer *isp_stat_buf_get(struct ispstat *stat, |
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struct omap3isp_stat_data *data) |
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{ |
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int rval = 0; |
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unsigned long flags; |
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struct ispstat_buffer *buf; |
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|
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spin_lock_irqsave(&stat->isp->stat_lock, flags); |
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|
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while (1) { |
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buf = isp_stat_buf_find_oldest(stat); |
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if (!buf) { |
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spin_unlock_irqrestore(&stat->isp->stat_lock, flags); |
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dev_dbg(stat->isp->dev, "%s: cannot find a buffer.\n", |
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stat->subdev.name); |
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return ERR_PTR(-EBUSY); |
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} |
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if (isp_stat_buf_check_magic(stat, buf)) { |
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dev_dbg(stat->isp->dev, |
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"%s: current buffer has corrupted data\n.", |
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stat->subdev.name); |
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/* Mark empty because it doesn't have valid data. */ |
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buf->empty = 1; |
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} else { |
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/* Buffer isn't corrupted. */ |
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break; |
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} |
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} |
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stat->locked_buf = buf; |
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|
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spin_unlock_irqrestore(&stat->isp->stat_lock, flags); |
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|
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if (buf->buf_size > data->buf_size) { |
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dev_warn(stat->isp->dev, |
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"%s: userspace's buffer size is not enough.\n", |
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stat->subdev.name); |
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isp_stat_buf_release(stat); |
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return ERR_PTR(-EINVAL); |
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} |
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isp_stat_buf_sync_for_cpu(stat, buf); |
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|
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rval = copy_to_user(data->buf, |
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buf->virt_addr, |
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buf->buf_size); |
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|
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if (rval) { |
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dev_info(stat->isp->dev, |
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"%s: failed copying %d bytes of stat data\n", |
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stat->subdev.name, rval); |
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buf = ERR_PTR(-EFAULT); |
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isp_stat_buf_release(stat); |
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} |
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|
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return buf; |
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} |
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|
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static void isp_stat_bufs_free(struct ispstat *stat) |
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{ |
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struct device *dev = ISP_STAT_USES_DMAENGINE(stat) |
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? NULL : stat->isp->dev; |
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unsigned int i; |
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|
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for (i = 0; i < STAT_MAX_BUFS; i++) { |
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struct ispstat_buffer *buf = &stat->buf[i]; |
|
|
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if (!buf->virt_addr) |
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continue; |
|
|
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sg_free_table(&buf->sgt); |
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|
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dma_free_coherent(dev, stat->buf_alloc_size, buf->virt_addr, |
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buf->dma_addr); |
|
|
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buf->dma_addr = 0; |
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buf->virt_addr = NULL; |
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buf->empty = 1; |
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} |
|
|
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dev_dbg(stat->isp->dev, "%s: all buffers were freed.\n", |
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stat->subdev.name); |
|
|
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stat->buf_alloc_size = 0; |
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stat->active_buf = NULL; |
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} |
|
|
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static int isp_stat_bufs_alloc_one(struct device *dev, |
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struct ispstat_buffer *buf, |
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unsigned int size) |
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{ |
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int ret; |
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|
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buf->virt_addr = dma_alloc_coherent(dev, size, &buf->dma_addr, |
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GFP_KERNEL); |
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if (!buf->virt_addr) |
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return -ENOMEM; |
|
|
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ret = dma_get_sgtable(dev, &buf->sgt, buf->virt_addr, buf->dma_addr, |
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size); |
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if (ret < 0) { |
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dma_free_coherent(dev, size, buf->virt_addr, buf->dma_addr); |
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buf->virt_addr = NULL; |
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buf->dma_addr = 0; |
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return ret; |
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} |
|
|
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return 0; |
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} |
|
|
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/* |
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* The device passed to the DMA API depends on whether the statistics block uses |
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* ISP DMA, external DMA or PIO to transfer data. |
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* |
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* The first case (for the AEWB and AF engines) passes the ISP device, resulting |
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* in the DMA buffers being mapped through the ISP IOMMU. |
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* |
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* The second case (for the histogram engine) should pass the DMA engine device. |
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* As that device isn't accessible through the OMAP DMA engine API the driver |
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* passes NULL instead, resulting in the buffers being mapped directly as |
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* physical pages. |
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* |
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* The third case (for the histogram engine) doesn't require any mapping. The |
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* buffers could be allocated with kmalloc/vmalloc, but we still use |
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* dma_alloc_coherent() for consistency purpose. |
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*/ |
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static int isp_stat_bufs_alloc(struct ispstat *stat, u32 size) |
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{ |
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struct device *dev = ISP_STAT_USES_DMAENGINE(stat) |
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? NULL : stat->isp->dev; |
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unsigned long flags; |
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unsigned int i; |
|
|
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spin_lock_irqsave(&stat->isp->stat_lock, flags); |
|
|
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BUG_ON(stat->locked_buf != NULL); |
|
|
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/* Are the old buffers big enough? */ |
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if (stat->buf_alloc_size >= size) { |
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spin_unlock_irqrestore(&stat->isp->stat_lock, flags); |
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return 0; |
|
} |
|
|
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if (stat->state != ISPSTAT_DISABLED || stat->buf_processing) { |
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dev_info(stat->isp->dev, |
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"%s: trying to allocate memory when busy\n", |
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stat->subdev.name); |
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spin_unlock_irqrestore(&stat->isp->stat_lock, flags); |
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return -EBUSY; |
|
} |
|
|
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spin_unlock_irqrestore(&stat->isp->stat_lock, flags); |
|
|
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isp_stat_bufs_free(stat); |
|
|
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stat->buf_alloc_size = size; |
|
|
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for (i = 0; i < STAT_MAX_BUFS; i++) { |
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struct ispstat_buffer *buf = &stat->buf[i]; |
|
int ret; |
|
|
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ret = isp_stat_bufs_alloc_one(dev, buf, size); |
|
if (ret < 0) { |
|
dev_err(stat->isp->dev, |
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"%s: Failed to allocate DMA buffer %u\n", |
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stat->subdev.name, i); |
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isp_stat_bufs_free(stat); |
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return ret; |
|
} |
|
|
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buf->empty = 1; |
|
|
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dev_dbg(stat->isp->dev, |
|
"%s: buffer[%u] allocated. dma=%pad virt=%p", |
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stat->subdev.name, i, &buf->dma_addr, buf->virt_addr); |
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} |
|
|
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return 0; |
|
} |
|
|
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static void isp_stat_queue_event(struct ispstat *stat, int err) |
|
{ |
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struct video_device *vdev = stat->subdev.devnode; |
|
struct v4l2_event event; |
|
struct omap3isp_stat_event_status *status = (void *)event.u.data; |
|
|
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memset(&event, 0, sizeof(event)); |
|
if (!err) { |
|
status->frame_number = stat->frame_number; |
|
status->config_counter = stat->config_counter; |
|
} else { |
|
status->buf_err = 1; |
|
} |
|
event.type = stat->event_type; |
|
v4l2_event_queue(vdev, &event); |
|
} |
|
|
|
|
|
/* |
|
* omap3isp_stat_request_statistics - Request statistics. |
|
* @data: Pointer to return statistics data. |
|
* |
|
* Returns 0 if successful. |
|
*/ |
|
int omap3isp_stat_request_statistics(struct ispstat *stat, |
|
struct omap3isp_stat_data *data) |
|
{ |
|
struct ispstat_buffer *buf; |
|
|
|
if (stat->state != ISPSTAT_ENABLED) { |
|
dev_dbg(stat->isp->dev, "%s: engine not enabled.\n", |
|
stat->subdev.name); |
|
return -EINVAL; |
|
} |
|
|
|
mutex_lock(&stat->ioctl_lock); |
|
buf = isp_stat_buf_get(stat, data); |
|
if (IS_ERR(buf)) { |
|
mutex_unlock(&stat->ioctl_lock); |
|
return PTR_ERR(buf); |
|
} |
|
|
|
data->ts.tv_sec = buf->ts.tv_sec; |
|
data->ts.tv_usec = buf->ts.tv_nsec / NSEC_PER_USEC; |
|
data->config_counter = buf->config_counter; |
|
data->frame_number = buf->frame_number; |
|
data->buf_size = buf->buf_size; |
|
|
|
buf->empty = 1; |
|
isp_stat_buf_release(stat); |
|
mutex_unlock(&stat->ioctl_lock); |
|
|
|
return 0; |
|
} |
|
|
|
int omap3isp_stat_request_statistics_time32(struct ispstat *stat, |
|
struct omap3isp_stat_data_time32 *data) |
|
{ |
|
struct omap3isp_stat_data data64; |
|
int ret; |
|
|
|
ret = omap3isp_stat_request_statistics(stat, &data64); |
|
if (ret) |
|
return ret; |
|
|
|
data->ts.tv_sec = data64.ts.tv_sec; |
|
data->ts.tv_usec = data64.ts.tv_usec; |
|
memcpy(&data->buf, &data64.buf, sizeof(*data) - sizeof(data->ts)); |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* omap3isp_stat_config - Receives new statistic engine configuration. |
|
* @new_conf: Pointer to config structure. |
|
* |
|
* Returns 0 if successful, -EINVAL if new_conf pointer is NULL, -ENOMEM if |
|
* was unable to allocate memory for the buffer, or other errors if parameters |
|
* are invalid. |
|
*/ |
|
int omap3isp_stat_config(struct ispstat *stat, void *new_conf) |
|
{ |
|
int ret; |
|
unsigned long irqflags; |
|
struct ispstat_generic_config *user_cfg = new_conf; |
|
u32 buf_size = user_cfg->buf_size; |
|
|
|
mutex_lock(&stat->ioctl_lock); |
|
|
|
dev_dbg(stat->isp->dev, |
|
"%s: configuring module with buffer size=0x%08lx\n", |
|
stat->subdev.name, (unsigned long)buf_size); |
|
|
|
ret = stat->ops->validate_params(stat, new_conf); |
|
if (ret) { |
|
mutex_unlock(&stat->ioctl_lock); |
|
dev_dbg(stat->isp->dev, "%s: configuration values are invalid.\n", |
|
stat->subdev.name); |
|
return ret; |
|
} |
|
|
|
if (buf_size != user_cfg->buf_size) |
|
dev_dbg(stat->isp->dev, |
|
"%s: driver has corrected buffer size request to 0x%08lx\n", |
|
stat->subdev.name, |
|
(unsigned long)user_cfg->buf_size); |
|
|
|
/* |
|
* Hack: H3A modules may need a doubled buffer size to avoid access |
|
* to a invalid memory address after a SBL overflow. |
|
* The buffer size is always PAGE_ALIGNED. |
|
* Hack 2: MAGIC_SIZE is added to buf_size so a magic word can be |
|
* inserted at the end to data integrity check purpose. |
|
* Hack 3: AF module writes one paxel data more than it should, so |
|
* the buffer allocation must consider it to avoid invalid memory |
|
* access. |
|
* Hack 4: H3A need to allocate extra space for the recover state. |
|
*/ |
|
if (IS_H3A(stat)) { |
|
buf_size = user_cfg->buf_size * 2 + MAGIC_SIZE; |
|
if (IS_H3A_AF(stat)) |
|
/* |
|
* Adding one extra paxel data size for each recover |
|
* buffer + 2 regular ones. |
|
*/ |
|
buf_size += AF_EXTRA_DATA * (NUM_H3A_RECOVER_BUFS + 2); |
|
if (stat->recover_priv) { |
|
struct ispstat_generic_config *recover_cfg = |
|
stat->recover_priv; |
|
buf_size += recover_cfg->buf_size * |
|
NUM_H3A_RECOVER_BUFS; |
|
} |
|
buf_size = PAGE_ALIGN(buf_size); |
|
} else { /* Histogram */ |
|
buf_size = PAGE_ALIGN(user_cfg->buf_size + MAGIC_SIZE); |
|
} |
|
|
|
ret = isp_stat_bufs_alloc(stat, buf_size); |
|
if (ret) { |
|
mutex_unlock(&stat->ioctl_lock); |
|
return ret; |
|
} |
|
|
|
spin_lock_irqsave(&stat->isp->stat_lock, irqflags); |
|
stat->ops->set_params(stat, new_conf); |
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags); |
|
|
|
/* |
|
* Returning the right future config_counter for this setup, so |
|
* userspace can *know* when it has been applied. |
|
*/ |
|
user_cfg->config_counter = stat->config_counter + stat->inc_config; |
|
|
|
/* Module has a valid configuration. */ |
|
stat->configured = 1; |
|
dev_dbg(stat->isp->dev, |
|
"%s: module has been successfully configured.\n", |
|
stat->subdev.name); |
|
|
|
mutex_unlock(&stat->ioctl_lock); |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* isp_stat_buf_process - Process statistic buffers. |
|
* @buf_state: points out if buffer is ready to be processed. It's necessary |
|
* because histogram needs to copy the data from internal memory |
|
* before be able to process the buffer. |
|
*/ |
|
static int isp_stat_buf_process(struct ispstat *stat, int buf_state) |
|
{ |
|
int ret = STAT_NO_BUF; |
|
|
|
if (!atomic_add_unless(&stat->buf_err, -1, 0) && |
|
buf_state == STAT_BUF_DONE && stat->state == ISPSTAT_ENABLED) { |
|
ret = isp_stat_buf_queue(stat); |
|
isp_stat_buf_next(stat); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
int omap3isp_stat_pcr_busy(struct ispstat *stat) |
|
{ |
|
return stat->ops->busy(stat); |
|
} |
|
|
|
int omap3isp_stat_busy(struct ispstat *stat) |
|
{ |
|
return omap3isp_stat_pcr_busy(stat) | stat->buf_processing | |
|
(stat->state != ISPSTAT_DISABLED); |
|
} |
|
|
|
/* |
|
* isp_stat_pcr_enable - Disables/Enables statistic engines. |
|
* @pcr_enable: 0/1 - Disables/Enables the engine. |
|
* |
|
* Must be called from ISP driver when the module is idle and synchronized |
|
* with CCDC. |
|
*/ |
|
static void isp_stat_pcr_enable(struct ispstat *stat, u8 pcr_enable) |
|
{ |
|
if ((stat->state != ISPSTAT_ENABLING && |
|
stat->state != ISPSTAT_ENABLED) && pcr_enable) |
|
/* Userspace has disabled the module. Aborting. */ |
|
return; |
|
|
|
stat->ops->enable(stat, pcr_enable); |
|
if (stat->state == ISPSTAT_DISABLING && !pcr_enable) |
|
stat->state = ISPSTAT_DISABLED; |
|
else if (stat->state == ISPSTAT_ENABLING && pcr_enable) |
|
stat->state = ISPSTAT_ENABLED; |
|
} |
|
|
|
void omap3isp_stat_suspend(struct ispstat *stat) |
|
{ |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&stat->isp->stat_lock, flags); |
|
|
|
if (stat->state != ISPSTAT_DISABLED) |
|
stat->ops->enable(stat, 0); |
|
if (stat->state == ISPSTAT_ENABLED) |
|
stat->state = ISPSTAT_SUSPENDED; |
|
|
|
spin_unlock_irqrestore(&stat->isp->stat_lock, flags); |
|
} |
|
|
|
void omap3isp_stat_resume(struct ispstat *stat) |
|
{ |
|
/* Module will be re-enabled with its pipeline */ |
|
if (stat->state == ISPSTAT_SUSPENDED) |
|
stat->state = ISPSTAT_ENABLING; |
|
} |
|
|
|
static void isp_stat_try_enable(struct ispstat *stat) |
|
{ |
|
unsigned long irqflags; |
|
|
|
if (stat->priv == NULL) |
|
/* driver wasn't initialised */ |
|
return; |
|
|
|
spin_lock_irqsave(&stat->isp->stat_lock, irqflags); |
|
if (stat->state == ISPSTAT_ENABLING && !stat->buf_processing && |
|
stat->buf_alloc_size) { |
|
/* |
|
* Userspace's requested to enable the engine but it wasn't yet. |
|
* Let's do that now. |
|
*/ |
|
stat->update = 1; |
|
isp_stat_buf_next(stat); |
|
stat->ops->setup_regs(stat, stat->priv); |
|
isp_stat_buf_insert_magic(stat, stat->active_buf); |
|
|
|
/* |
|
* H3A module has some hw issues which forces the driver to |
|
* ignore next buffers even if it was disabled in the meantime. |
|
* On the other hand, Histogram shouldn't ignore buffers anymore |
|
* if it's being enabled. |
|
*/ |
|
if (!IS_H3A(stat)) |
|
atomic_set(&stat->buf_err, 0); |
|
|
|
isp_stat_pcr_enable(stat, 1); |
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags); |
|
dev_dbg(stat->isp->dev, "%s: module is enabled.\n", |
|
stat->subdev.name); |
|
} else { |
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags); |
|
} |
|
} |
|
|
|
void omap3isp_stat_isr_frame_sync(struct ispstat *stat) |
|
{ |
|
isp_stat_try_enable(stat); |
|
} |
|
|
|
void omap3isp_stat_sbl_overflow(struct ispstat *stat) |
|
{ |
|
unsigned long irqflags; |
|
|
|
spin_lock_irqsave(&stat->isp->stat_lock, irqflags); |
|
/* |
|
* Due to a H3A hw issue which prevents the next buffer to start from |
|
* the correct memory address, 2 buffers must be ignored. |
|
*/ |
|
atomic_set(&stat->buf_err, 2); |
|
|
|
/* |
|
* If more than one SBL overflow happen in a row, H3A module may access |
|
* invalid memory region. |
|
* stat->sbl_ovl_recover is set to tell to the driver to temporarily use |
|
* a soft configuration which helps to avoid consecutive overflows. |
|
*/ |
|
if (stat->recover_priv) |
|
stat->sbl_ovl_recover = 1; |
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags); |
|
} |
|
|
|
/* |
|
* omap3isp_stat_enable - Disable/Enable statistic engine as soon as possible |
|
* @enable: 0/1 - Disables/Enables the engine. |
|
* |
|
* Client should configure all the module registers before this. |
|
* This function can be called from a userspace request. |
|
*/ |
|
int omap3isp_stat_enable(struct ispstat *stat, u8 enable) |
|
{ |
|
unsigned long irqflags; |
|
|
|
dev_dbg(stat->isp->dev, "%s: user wants to %s module.\n", |
|
stat->subdev.name, enable ? "enable" : "disable"); |
|
|
|
/* Prevent enabling while configuring */ |
|
mutex_lock(&stat->ioctl_lock); |
|
|
|
spin_lock_irqsave(&stat->isp->stat_lock, irqflags); |
|
|
|
if (!stat->configured && enable) { |
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags); |
|
mutex_unlock(&stat->ioctl_lock); |
|
dev_dbg(stat->isp->dev, |
|
"%s: cannot enable module as it's never been successfully configured so far.\n", |
|
stat->subdev.name); |
|
return -EINVAL; |
|
} |
|
|
|
if (enable) { |
|
if (stat->state == ISPSTAT_DISABLING) |
|
/* Previous disabling request wasn't done yet */ |
|
stat->state = ISPSTAT_ENABLED; |
|
else if (stat->state == ISPSTAT_DISABLED) |
|
/* Module is now being enabled */ |
|
stat->state = ISPSTAT_ENABLING; |
|
} else { |
|
if (stat->state == ISPSTAT_ENABLING) { |
|
/* Previous enabling request wasn't done yet */ |
|
stat->state = ISPSTAT_DISABLED; |
|
} else if (stat->state == ISPSTAT_ENABLED) { |
|
/* Module is now being disabled */ |
|
stat->state = ISPSTAT_DISABLING; |
|
isp_stat_buf_clear(stat); |
|
} |
|
} |
|
|
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags); |
|
mutex_unlock(&stat->ioctl_lock); |
|
|
|
return 0; |
|
} |
|
|
|
int omap3isp_stat_s_stream(struct v4l2_subdev *subdev, int enable) |
|
{ |
|
struct ispstat *stat = v4l2_get_subdevdata(subdev); |
|
|
|
if (enable) { |
|
/* |
|
* Only set enable PCR bit if the module was previously |
|
* enabled through ioctl. |
|
*/ |
|
isp_stat_try_enable(stat); |
|
} else { |
|
unsigned long flags; |
|
/* Disable PCR bit and config enable field */ |
|
omap3isp_stat_enable(stat, 0); |
|
spin_lock_irqsave(&stat->isp->stat_lock, flags); |
|
stat->ops->enable(stat, 0); |
|
spin_unlock_irqrestore(&stat->isp->stat_lock, flags); |
|
|
|
/* |
|
* If module isn't busy, a new interrupt may come or not to |
|
* set the state to DISABLED. As Histogram needs to read its |
|
* internal memory to clear it, let interrupt handler |
|
* responsible of changing state to DISABLED. If the last |
|
* interrupt is coming, it's still safe as the handler will |
|
* ignore the second time when state is already set to DISABLED. |
|
* It's necessary to synchronize Histogram with streamoff, once |
|
* the module may be considered idle before last SDMA transfer |
|
* starts if we return here. |
|
*/ |
|
if (!omap3isp_stat_pcr_busy(stat)) |
|
omap3isp_stat_isr(stat); |
|
|
|
dev_dbg(stat->isp->dev, "%s: module is being disabled\n", |
|
stat->subdev.name); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* __stat_isr - Interrupt handler for statistic drivers |
|
*/ |
|
static void __stat_isr(struct ispstat *stat, int from_dma) |
|
{ |
|
int ret = STAT_BUF_DONE; |
|
int buf_processing; |
|
unsigned long irqflags; |
|
struct isp_pipeline *pipe; |
|
|
|
/* |
|
* stat->buf_processing must be set before disable module. It's |
|
* necessary to not inform too early the buffers aren't busy in case |
|
* of SDMA is going to be used. |
|
*/ |
|
spin_lock_irqsave(&stat->isp->stat_lock, irqflags); |
|
if (stat->state == ISPSTAT_DISABLED) { |
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags); |
|
return; |
|
} |
|
buf_processing = stat->buf_processing; |
|
stat->buf_processing = 1; |
|
stat->ops->enable(stat, 0); |
|
|
|
if (buf_processing && !from_dma) { |
|
if (stat->state == ISPSTAT_ENABLED) { |
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags); |
|
dev_err(stat->isp->dev, |
|
"%s: interrupt occurred when module was still processing a buffer.\n", |
|
stat->subdev.name); |
|
ret = STAT_NO_BUF; |
|
goto out; |
|
} else { |
|
/* |
|
* Interrupt handler was called from streamoff when |
|
* the module wasn't busy anymore to ensure it is being |
|
* disabled after process last buffer. If such buffer |
|
* processing has already started, no need to do |
|
* anything else. |
|
*/ |
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags); |
|
return; |
|
} |
|
} |
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags); |
|
|
|
/* If it's busy we can't process this buffer anymore */ |
|
if (!omap3isp_stat_pcr_busy(stat)) { |
|
if (!from_dma && stat->ops->buf_process) |
|
/* Module still need to copy data to buffer. */ |
|
ret = stat->ops->buf_process(stat); |
|
if (ret == STAT_BUF_WAITING_DMA) |
|
/* Buffer is not ready yet */ |
|
return; |
|
|
|
spin_lock_irqsave(&stat->isp->stat_lock, irqflags); |
|
|
|
/* |
|
* Histogram needs to read its internal memory to clear it |
|
* before be disabled. For that reason, common statistic layer |
|
* can return only after call stat's buf_process() operator. |
|
*/ |
|
if (stat->state == ISPSTAT_DISABLING) { |
|
stat->state = ISPSTAT_DISABLED; |
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags); |
|
stat->buf_processing = 0; |
|
return; |
|
} |
|
pipe = to_isp_pipeline(&stat->subdev.entity); |
|
stat->frame_number = atomic_read(&pipe->frame_number); |
|
|
|
/* |
|
* Before this point, 'ret' stores the buffer's status if it's |
|
* ready to be processed. Afterwards, it holds the status if |
|
* it was processed successfully. |
|
*/ |
|
ret = isp_stat_buf_process(stat, ret); |
|
|
|
if (likely(!stat->sbl_ovl_recover)) { |
|
stat->ops->setup_regs(stat, stat->priv); |
|
} else { |
|
/* |
|
* Using recover config to increase the chance to have |
|
* a good buffer processing and make the H3A module to |
|
* go back to a valid state. |
|
*/ |
|
stat->update = 1; |
|
stat->ops->setup_regs(stat, stat->recover_priv); |
|
stat->sbl_ovl_recover = 0; |
|
|
|
/* |
|
* Set 'update' in case of the module needs to use |
|
* regular configuration after next buffer. |
|
*/ |
|
stat->update = 1; |
|
} |
|
|
|
isp_stat_buf_insert_magic(stat, stat->active_buf); |
|
|
|
/* |
|
* Hack: H3A modules may access invalid memory address or send |
|
* corrupted data to userspace if more than 1 SBL overflow |
|
* happens in a row without re-writing its buffer's start memory |
|
* address in the meantime. Such situation is avoided if the |
|
* module is not immediately re-enabled when the ISR misses the |
|
* timing to process the buffer and to setup the registers. |
|
* Because of that, pcr_enable(1) was moved to inside this 'if' |
|
* block. But the next interruption will still happen as during |
|
* pcr_enable(0) the module was busy. |
|
*/ |
|
isp_stat_pcr_enable(stat, 1); |
|
spin_unlock_irqrestore(&stat->isp->stat_lock, irqflags); |
|
} else { |
|
/* |
|
* If a SBL overflow occurs and the H3A driver misses the timing |
|
* to process the buffer, stat->buf_err is set and won't be |
|
* cleared now. So the next buffer will be correctly ignored. |
|
* It's necessary due to a hw issue which makes the next H3A |
|
* buffer to start from the memory address where the previous |
|
* one stopped, instead of start where it was configured to. |
|
* Do not "stat->buf_err = 0" here. |
|
*/ |
|
|
|
if (stat->ops->buf_process) |
|
/* |
|
* Driver may need to erase current data prior to |
|
* process a new buffer. If it misses the timing, the |
|
* next buffer might be wrong. So should be ignored. |
|
* It happens only for Histogram. |
|
*/ |
|
atomic_set(&stat->buf_err, 1); |
|
|
|
ret = STAT_NO_BUF; |
|
dev_dbg(stat->isp->dev, |
|
"%s: cannot process buffer, device is busy.\n", |
|
stat->subdev.name); |
|
} |
|
|
|
out: |
|
stat->buf_processing = 0; |
|
isp_stat_queue_event(stat, ret != STAT_BUF_DONE); |
|
} |
|
|
|
void omap3isp_stat_isr(struct ispstat *stat) |
|
{ |
|
__stat_isr(stat, 0); |
|
} |
|
|
|
void omap3isp_stat_dma_isr(struct ispstat *stat) |
|
{ |
|
__stat_isr(stat, 1); |
|
} |
|
|
|
int omap3isp_stat_subscribe_event(struct v4l2_subdev *subdev, |
|
struct v4l2_fh *fh, |
|
struct v4l2_event_subscription *sub) |
|
{ |
|
struct ispstat *stat = v4l2_get_subdevdata(subdev); |
|
|
|
if (sub->type != stat->event_type) |
|
return -EINVAL; |
|
|
|
return v4l2_event_subscribe(fh, sub, STAT_NEVENTS, NULL); |
|
} |
|
|
|
int omap3isp_stat_unsubscribe_event(struct v4l2_subdev *subdev, |
|
struct v4l2_fh *fh, |
|
struct v4l2_event_subscription *sub) |
|
{ |
|
return v4l2_event_unsubscribe(fh, sub); |
|
} |
|
|
|
void omap3isp_stat_unregister_entities(struct ispstat *stat) |
|
{ |
|
v4l2_device_unregister_subdev(&stat->subdev); |
|
} |
|
|
|
int omap3isp_stat_register_entities(struct ispstat *stat, |
|
struct v4l2_device *vdev) |
|
{ |
|
stat->subdev.dev = vdev->mdev->dev; |
|
|
|
return v4l2_device_register_subdev(vdev, &stat->subdev); |
|
} |
|
|
|
static int isp_stat_init_entities(struct ispstat *stat, const char *name, |
|
const struct v4l2_subdev_ops *sd_ops) |
|
{ |
|
struct v4l2_subdev *subdev = &stat->subdev; |
|
struct media_entity *me = &subdev->entity; |
|
|
|
v4l2_subdev_init(subdev, sd_ops); |
|
snprintf(subdev->name, V4L2_SUBDEV_NAME_SIZE, "OMAP3 ISP %s", name); |
|
subdev->grp_id = BIT(16); /* group ID for isp subdevs */ |
|
subdev->flags |= V4L2_SUBDEV_FL_HAS_EVENTS | V4L2_SUBDEV_FL_HAS_DEVNODE; |
|
v4l2_set_subdevdata(subdev, stat); |
|
|
|
stat->pad.flags = MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT; |
|
me->ops = NULL; |
|
|
|
return media_entity_pads_init(me, 1, &stat->pad); |
|
} |
|
|
|
int omap3isp_stat_init(struct ispstat *stat, const char *name, |
|
const struct v4l2_subdev_ops *sd_ops) |
|
{ |
|
int ret; |
|
|
|
stat->buf = kcalloc(STAT_MAX_BUFS, sizeof(*stat->buf), GFP_KERNEL); |
|
if (!stat->buf) |
|
return -ENOMEM; |
|
|
|
isp_stat_buf_clear(stat); |
|
mutex_init(&stat->ioctl_lock); |
|
atomic_set(&stat->buf_err, 0); |
|
|
|
ret = isp_stat_init_entities(stat, name, sd_ops); |
|
if (ret < 0) { |
|
mutex_destroy(&stat->ioctl_lock); |
|
kfree(stat->buf); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
void omap3isp_stat_cleanup(struct ispstat *stat) |
|
{ |
|
media_entity_cleanup(&stat->subdev.entity); |
|
mutex_destroy(&stat->ioctl_lock); |
|
isp_stat_bufs_free(stat); |
|
kfree(stat->buf); |
|
kfree(stat->priv); |
|
kfree(stat->recover_priv); |
|
}
|
|
|