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213 lines
5.7 KiB
213 lines
5.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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User DMA |
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Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com> |
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Copyright (C) 2004 Chris Kennedy <[email protected]> |
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Copyright (C) 2005-2007 Hans Verkuil <[email protected]> |
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*/ |
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#include "ivtv-driver.h" |
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#include "ivtv-udma.h" |
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void ivtv_udma_get_page_info(struct ivtv_dma_page_info *dma_page, unsigned long first, unsigned long size) |
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{ |
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dma_page->uaddr = first & PAGE_MASK; |
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dma_page->offset = first & ~PAGE_MASK; |
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dma_page->tail = 1 + ((first+size-1) & ~PAGE_MASK); |
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dma_page->first = (first & PAGE_MASK) >> PAGE_SHIFT; |
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dma_page->last = ((first+size-1) & PAGE_MASK) >> PAGE_SHIFT; |
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dma_page->page_count = dma_page->last - dma_page->first + 1; |
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if (dma_page->page_count == 1) dma_page->tail -= dma_page->offset; |
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} |
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int ivtv_udma_fill_sg_list (struct ivtv_user_dma *dma, struct ivtv_dma_page_info *dma_page, int map_offset) |
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{ |
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int i, offset; |
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unsigned long flags; |
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if (map_offset < 0) |
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return map_offset; |
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offset = dma_page->offset; |
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/* Fill SG Array with new values */ |
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for (i = 0; i < dma_page->page_count; i++) { |
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unsigned int len = (i == dma_page->page_count - 1) ? |
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dma_page->tail : PAGE_SIZE - offset; |
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if (PageHighMem(dma->map[map_offset])) { |
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void *src; |
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if (dma->bouncemap[map_offset] == NULL) |
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dma->bouncemap[map_offset] = alloc_page(GFP_KERNEL); |
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if (dma->bouncemap[map_offset] == NULL) |
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return -1; |
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local_irq_save(flags); |
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src = kmap_atomic(dma->map[map_offset]) + offset; |
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memcpy(page_address(dma->bouncemap[map_offset]) + offset, src, len); |
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kunmap_atomic(src); |
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local_irq_restore(flags); |
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sg_set_page(&dma->SGlist[map_offset], dma->bouncemap[map_offset], len, offset); |
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} |
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else { |
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sg_set_page(&dma->SGlist[map_offset], dma->map[map_offset], len, offset); |
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} |
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offset = 0; |
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map_offset++; |
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} |
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return map_offset; |
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} |
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void ivtv_udma_fill_sg_array (struct ivtv_user_dma *dma, u32 buffer_offset, u32 buffer_offset_2, u32 split) { |
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int i; |
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struct scatterlist *sg; |
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for_each_sg(dma->SGlist, sg, dma->SG_length, i) { |
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dma->SGarray[i].size = cpu_to_le32(sg_dma_len(sg)); |
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dma->SGarray[i].src = cpu_to_le32(sg_dma_address(sg)); |
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dma->SGarray[i].dst = cpu_to_le32(buffer_offset); |
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buffer_offset += sg_dma_len(sg); |
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split -= sg_dma_len(sg); |
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if (split == 0) |
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buffer_offset = buffer_offset_2; |
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} |
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} |
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/* User DMA Buffers */ |
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void ivtv_udma_alloc(struct ivtv *itv) |
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{ |
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if (itv->udma.SG_handle == 0) { |
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/* Map DMA Page Array Buffer */ |
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itv->udma.SG_handle = pci_map_single(itv->pdev, itv->udma.SGarray, |
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sizeof(itv->udma.SGarray), PCI_DMA_TODEVICE); |
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ivtv_udma_sync_for_cpu(itv); |
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} |
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} |
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int ivtv_udma_setup(struct ivtv *itv, unsigned long ivtv_dest_addr, |
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void __user *userbuf, int size_in_bytes) |
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{ |
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struct ivtv_dma_page_info user_dma; |
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struct ivtv_user_dma *dma = &itv->udma; |
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int err; |
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IVTV_DEBUG_DMA("ivtv_udma_setup, dst: 0x%08x\n", (unsigned int)ivtv_dest_addr); |
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/* Still in USE */ |
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if (dma->SG_length || dma->page_count) { |
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IVTV_DEBUG_WARN("ivtv_udma_setup: SG_length %d page_count %d still full?\n", |
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dma->SG_length, dma->page_count); |
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return -EBUSY; |
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} |
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ivtv_udma_get_page_info(&user_dma, (unsigned long)userbuf, size_in_bytes); |
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if (user_dma.page_count <= 0) { |
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IVTV_DEBUG_WARN("ivtv_udma_setup: Error %d page_count from %d bytes %d offset\n", |
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user_dma.page_count, size_in_bytes, user_dma.offset); |
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return -EINVAL; |
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} |
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/* Pin user pages for DMA Xfer */ |
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err = pin_user_pages_unlocked(user_dma.uaddr, user_dma.page_count, |
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dma->map, FOLL_FORCE); |
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if (user_dma.page_count != err) { |
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IVTV_DEBUG_WARN("failed to map user pages, returned %d instead of %d\n", |
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err, user_dma.page_count); |
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if (err >= 0) { |
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unpin_user_pages(dma->map, err); |
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return -EINVAL; |
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} |
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return err; |
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} |
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dma->page_count = user_dma.page_count; |
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/* Fill SG List with new values */ |
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if (ivtv_udma_fill_sg_list(dma, &user_dma, 0) < 0) { |
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unpin_user_pages(dma->map, dma->page_count); |
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dma->page_count = 0; |
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return -ENOMEM; |
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} |
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/* Map SG List */ |
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dma->SG_length = pci_map_sg(itv->pdev, dma->SGlist, dma->page_count, PCI_DMA_TODEVICE); |
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/* Fill SG Array with new values */ |
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ivtv_udma_fill_sg_array (dma, ivtv_dest_addr, 0, -1); |
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/* Tag SG Array with Interrupt Bit */ |
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dma->SGarray[dma->SG_length - 1].size |= cpu_to_le32(0x80000000); |
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ivtv_udma_sync_for_device(itv); |
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return dma->page_count; |
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} |
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void ivtv_udma_unmap(struct ivtv *itv) |
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{ |
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struct ivtv_user_dma *dma = &itv->udma; |
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IVTV_DEBUG_INFO("ivtv_unmap_user_dma\n"); |
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/* Nothing to free */ |
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if (dma->page_count == 0) |
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return; |
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/* Unmap Scatterlist */ |
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if (dma->SG_length) { |
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pci_unmap_sg(itv->pdev, dma->SGlist, dma->page_count, PCI_DMA_TODEVICE); |
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dma->SG_length = 0; |
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} |
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/* sync DMA */ |
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ivtv_udma_sync_for_cpu(itv); |
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unpin_user_pages(dma->map, dma->page_count); |
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dma->page_count = 0; |
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} |
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void ivtv_udma_free(struct ivtv *itv) |
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{ |
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int i; |
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/* Unmap SG Array */ |
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if (itv->udma.SG_handle) { |
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pci_unmap_single(itv->pdev, itv->udma.SG_handle, |
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sizeof(itv->udma.SGarray), PCI_DMA_TODEVICE); |
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} |
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/* Unmap Scatterlist */ |
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if (itv->udma.SG_length) { |
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pci_unmap_sg(itv->pdev, itv->udma.SGlist, itv->udma.page_count, PCI_DMA_TODEVICE); |
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} |
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for (i = 0; i < IVTV_DMA_SG_OSD_ENT; i++) { |
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if (itv->udma.bouncemap[i]) |
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__free_page(itv->udma.bouncemap[i]); |
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} |
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} |
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void ivtv_udma_start(struct ivtv *itv) |
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{ |
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IVTV_DEBUG_DMA("start UDMA\n"); |
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write_reg(itv->udma.SG_handle, IVTV_REG_DECDMAADDR); |
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write_reg_sync(read_reg(IVTV_REG_DMAXFER) | 0x01, IVTV_REG_DMAXFER); |
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set_bit(IVTV_F_I_DMA, &itv->i_flags); |
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set_bit(IVTV_F_I_UDMA, &itv->i_flags); |
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clear_bit(IVTV_F_I_UDMA_PENDING, &itv->i_flags); |
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} |
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void ivtv_udma_prepare(struct ivtv *itv) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&itv->dma_reg_lock, flags); |
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if (!test_bit(IVTV_F_I_DMA, &itv->i_flags)) |
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ivtv_udma_start(itv); |
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else |
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set_bit(IVTV_F_I_UDMA_PENDING, &itv->i_flags); |
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spin_unlock_irqrestore(&itv->dma_reg_lock, flags); |
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}
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