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767 lines
20 KiB
767 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* i.MX drm driver - LVDS display bridge |
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* |
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* Copyright (C) 2012 Sascha Hauer, Pengutronix |
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*/ |
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|
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#include <linux/clk.h> |
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#include <linux/component.h> |
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#include <linux/mfd/syscon.h> |
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#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h> |
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#include <linux/module.h> |
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#include <linux/of_device.h> |
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#include <linux/of_graph.h> |
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#include <linux/regmap.h> |
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#include <linux/videodev2.h> |
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#include <video/of_display_timing.h> |
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#include <video/of_videomode.h> |
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#include <drm/drm_atomic.h> |
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#include <drm/drm_atomic_helper.h> |
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#include <drm/drm_bridge.h> |
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#include <drm/drm_fb_helper.h> |
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#include <drm/drm_managed.h> |
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#include <drm/drm_of.h> |
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#include <drm/drm_panel.h> |
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#include <drm/drm_print.h> |
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#include <drm/drm_probe_helper.h> |
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#include <drm/drm_simple_kms_helper.h> |
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#include "imx-drm.h" |
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#define DRIVER_NAME "imx-ldb" |
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#define LDB_CH0_MODE_EN_TO_DI0 (1 << 0) |
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#define LDB_CH0_MODE_EN_TO_DI1 (3 << 0) |
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#define LDB_CH0_MODE_EN_MASK (3 << 0) |
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#define LDB_CH1_MODE_EN_TO_DI0 (1 << 2) |
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#define LDB_CH1_MODE_EN_TO_DI1 (3 << 2) |
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#define LDB_CH1_MODE_EN_MASK (3 << 2) |
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#define LDB_SPLIT_MODE_EN (1 << 4) |
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#define LDB_DATA_WIDTH_CH0_24 (1 << 5) |
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#define LDB_BIT_MAP_CH0_JEIDA (1 << 6) |
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#define LDB_DATA_WIDTH_CH1_24 (1 << 7) |
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#define LDB_BIT_MAP_CH1_JEIDA (1 << 8) |
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#define LDB_DI0_VS_POL_ACT_LOW (1 << 9) |
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#define LDB_DI1_VS_POL_ACT_LOW (1 << 10) |
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#define LDB_BGREF_RMODE_INT (1 << 15) |
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struct imx_ldb_channel; |
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struct imx_ldb_encoder { |
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struct drm_connector connector; |
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struct drm_encoder encoder; |
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struct imx_ldb_channel *channel; |
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}; |
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struct imx_ldb; |
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struct imx_ldb_channel { |
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struct imx_ldb *ldb; |
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/* Defines what is connected to the ldb, only one at a time */ |
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struct drm_panel *panel; |
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struct drm_bridge *bridge; |
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struct device_node *child; |
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struct i2c_adapter *ddc; |
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int chno; |
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void *edid; |
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struct drm_display_mode mode; |
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int mode_valid; |
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u32 bus_format; |
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u32 bus_flags; |
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}; |
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static inline struct imx_ldb_channel *con_to_imx_ldb_ch(struct drm_connector *c) |
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{ |
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return container_of(c, struct imx_ldb_encoder, connector)->channel; |
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} |
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static inline struct imx_ldb_channel *enc_to_imx_ldb_ch(struct drm_encoder *e) |
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{ |
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return container_of(e, struct imx_ldb_encoder, encoder)->channel; |
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} |
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struct bus_mux { |
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int reg; |
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int shift; |
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int mask; |
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}; |
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struct imx_ldb { |
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struct regmap *regmap; |
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struct device *dev; |
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struct imx_ldb_channel channel[2]; |
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struct clk *clk[2]; /* our own clock */ |
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struct clk *clk_sel[4]; /* parent of display clock */ |
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struct clk *clk_parent[4]; /* original parent of clk_sel */ |
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struct clk *clk_pll[2]; /* upstream clock we can adjust */ |
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u32 ldb_ctrl; |
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const struct bus_mux *lvds_mux; |
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}; |
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static void imx_ldb_ch_set_bus_format(struct imx_ldb_channel *imx_ldb_ch, |
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u32 bus_format) |
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{ |
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struct imx_ldb *ldb = imx_ldb_ch->ldb; |
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int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN; |
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switch (bus_format) { |
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case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG: |
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break; |
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case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG: |
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if (imx_ldb_ch->chno == 0 || dual) |
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ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24; |
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if (imx_ldb_ch->chno == 1 || dual) |
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ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24; |
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break; |
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case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA: |
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if (imx_ldb_ch->chno == 0 || dual) |
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ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 | |
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LDB_BIT_MAP_CH0_JEIDA; |
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if (imx_ldb_ch->chno == 1 || dual) |
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ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 | |
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LDB_BIT_MAP_CH1_JEIDA; |
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break; |
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} |
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} |
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static int imx_ldb_connector_get_modes(struct drm_connector *connector) |
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{ |
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struct imx_ldb_channel *imx_ldb_ch = con_to_imx_ldb_ch(connector); |
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int num_modes; |
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num_modes = drm_panel_get_modes(imx_ldb_ch->panel, connector); |
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if (num_modes > 0) |
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return num_modes; |
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if (!imx_ldb_ch->edid && imx_ldb_ch->ddc) |
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imx_ldb_ch->edid = drm_get_edid(connector, imx_ldb_ch->ddc); |
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if (imx_ldb_ch->edid) { |
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drm_connector_update_edid_property(connector, |
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imx_ldb_ch->edid); |
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num_modes = drm_add_edid_modes(connector, imx_ldb_ch->edid); |
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} |
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if (imx_ldb_ch->mode_valid) { |
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struct drm_display_mode *mode; |
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mode = drm_mode_create(connector->dev); |
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if (!mode) |
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return -EINVAL; |
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drm_mode_copy(mode, &imx_ldb_ch->mode); |
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mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; |
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drm_mode_probed_add(connector, mode); |
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num_modes++; |
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} |
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return num_modes; |
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} |
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static void imx_ldb_set_clock(struct imx_ldb *ldb, int mux, int chno, |
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unsigned long serial_clk, unsigned long di_clk) |
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{ |
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int ret; |
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dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__, |
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clk_get_rate(ldb->clk_pll[chno]), serial_clk); |
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clk_set_rate(ldb->clk_pll[chno], serial_clk); |
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dev_dbg(ldb->dev, "%s after: %ld\n", __func__, |
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clk_get_rate(ldb->clk_pll[chno])); |
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dev_dbg(ldb->dev, "%s: now: %ld want: %ld\n", __func__, |
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clk_get_rate(ldb->clk[chno]), |
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(long int)di_clk); |
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clk_set_rate(ldb->clk[chno], di_clk); |
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dev_dbg(ldb->dev, "%s after: %ld\n", __func__, |
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clk_get_rate(ldb->clk[chno])); |
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/* set display clock mux to LDB input clock */ |
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ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk[chno]); |
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if (ret) |
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dev_err(ldb->dev, |
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"unable to set di%d parent clock to ldb_di%d\n", mux, |
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chno); |
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} |
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static void imx_ldb_encoder_enable(struct drm_encoder *encoder) |
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{ |
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struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder); |
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struct imx_ldb *ldb = imx_ldb_ch->ldb; |
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int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN; |
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int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder); |
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if (mux < 0 || mux >= ARRAY_SIZE(ldb->clk_sel)) { |
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dev_warn(ldb->dev, "%s: invalid mux %d\n", __func__, mux); |
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return; |
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} |
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drm_panel_prepare(imx_ldb_ch->panel); |
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if (dual) { |
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clk_set_parent(ldb->clk_sel[mux], ldb->clk[0]); |
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clk_set_parent(ldb->clk_sel[mux], ldb->clk[1]); |
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clk_prepare_enable(ldb->clk[0]); |
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clk_prepare_enable(ldb->clk[1]); |
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} else { |
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clk_set_parent(ldb->clk_sel[mux], ldb->clk[imx_ldb_ch->chno]); |
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} |
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if (imx_ldb_ch == &ldb->channel[0] || dual) { |
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ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK; |
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if (mux == 0 || ldb->lvds_mux) |
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ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI0; |
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else if (mux == 1) |
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ldb->ldb_ctrl |= LDB_CH0_MODE_EN_TO_DI1; |
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} |
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if (imx_ldb_ch == &ldb->channel[1] || dual) { |
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ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK; |
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if (mux == 1 || ldb->lvds_mux) |
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ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI1; |
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else if (mux == 0) |
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ldb->ldb_ctrl |= LDB_CH1_MODE_EN_TO_DI0; |
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} |
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if (ldb->lvds_mux) { |
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const struct bus_mux *lvds_mux = NULL; |
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if (imx_ldb_ch == &ldb->channel[0]) |
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lvds_mux = &ldb->lvds_mux[0]; |
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else if (imx_ldb_ch == &ldb->channel[1]) |
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lvds_mux = &ldb->lvds_mux[1]; |
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regmap_update_bits(ldb->regmap, lvds_mux->reg, lvds_mux->mask, |
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mux << lvds_mux->shift); |
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} |
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regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl); |
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drm_panel_enable(imx_ldb_ch->panel); |
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} |
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static void |
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imx_ldb_encoder_atomic_mode_set(struct drm_encoder *encoder, |
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struct drm_crtc_state *crtc_state, |
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struct drm_connector_state *connector_state) |
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{ |
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struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder); |
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struct drm_display_mode *mode = &crtc_state->adjusted_mode; |
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struct imx_ldb *ldb = imx_ldb_ch->ldb; |
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int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN; |
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unsigned long serial_clk; |
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unsigned long di_clk = mode->clock * 1000; |
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int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder); |
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u32 bus_format = imx_ldb_ch->bus_format; |
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if (mux < 0 || mux >= ARRAY_SIZE(ldb->clk_sel)) { |
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dev_warn(ldb->dev, "%s: invalid mux %d\n", __func__, mux); |
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return; |
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} |
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if (mode->clock > 170000) { |
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dev_warn(ldb->dev, |
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"%s: mode exceeds 170 MHz pixel clock\n", __func__); |
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} |
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if (mode->clock > 85000 && !dual) { |
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dev_warn(ldb->dev, |
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"%s: mode exceeds 85 MHz pixel clock\n", __func__); |
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} |
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if (!IS_ALIGNED(mode->hdisplay, 8)) { |
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dev_warn(ldb->dev, |
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"%s: hdisplay does not align to 8 byte\n", __func__); |
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} |
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if (dual) { |
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serial_clk = 3500UL * mode->clock; |
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imx_ldb_set_clock(ldb, mux, 0, serial_clk, di_clk); |
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imx_ldb_set_clock(ldb, mux, 1, serial_clk, di_clk); |
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} else { |
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serial_clk = 7000UL * mode->clock; |
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imx_ldb_set_clock(ldb, mux, imx_ldb_ch->chno, serial_clk, |
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di_clk); |
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} |
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/* FIXME - assumes straight connections DI0 --> CH0, DI1 --> CH1 */ |
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if (imx_ldb_ch == &ldb->channel[0] || dual) { |
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if (mode->flags & DRM_MODE_FLAG_NVSYNC) |
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ldb->ldb_ctrl |= LDB_DI0_VS_POL_ACT_LOW; |
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else if (mode->flags & DRM_MODE_FLAG_PVSYNC) |
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ldb->ldb_ctrl &= ~LDB_DI0_VS_POL_ACT_LOW; |
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} |
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if (imx_ldb_ch == &ldb->channel[1] || dual) { |
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if (mode->flags & DRM_MODE_FLAG_NVSYNC) |
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ldb->ldb_ctrl |= LDB_DI1_VS_POL_ACT_LOW; |
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else if (mode->flags & DRM_MODE_FLAG_PVSYNC) |
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ldb->ldb_ctrl &= ~LDB_DI1_VS_POL_ACT_LOW; |
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} |
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if (!bus_format) { |
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struct drm_connector *connector = connector_state->connector; |
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struct drm_display_info *di = &connector->display_info; |
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if (di->num_bus_formats) |
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bus_format = di->bus_formats[0]; |
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} |
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imx_ldb_ch_set_bus_format(imx_ldb_ch, bus_format); |
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} |
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static void imx_ldb_encoder_disable(struct drm_encoder *encoder) |
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{ |
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struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder); |
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struct imx_ldb *ldb = imx_ldb_ch->ldb; |
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int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN; |
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int mux, ret; |
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drm_panel_disable(imx_ldb_ch->panel); |
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if (imx_ldb_ch == &ldb->channel[0] || dual) |
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ldb->ldb_ctrl &= ~LDB_CH0_MODE_EN_MASK; |
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if (imx_ldb_ch == &ldb->channel[1] || dual) |
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ldb->ldb_ctrl &= ~LDB_CH1_MODE_EN_MASK; |
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regmap_write(ldb->regmap, IOMUXC_GPR2, ldb->ldb_ctrl); |
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if (dual) { |
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clk_disable_unprepare(ldb->clk[0]); |
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clk_disable_unprepare(ldb->clk[1]); |
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} |
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if (ldb->lvds_mux) { |
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const struct bus_mux *lvds_mux = NULL; |
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if (imx_ldb_ch == &ldb->channel[0]) |
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lvds_mux = &ldb->lvds_mux[0]; |
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else if (imx_ldb_ch == &ldb->channel[1]) |
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lvds_mux = &ldb->lvds_mux[1]; |
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regmap_read(ldb->regmap, lvds_mux->reg, &mux); |
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mux &= lvds_mux->mask; |
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mux >>= lvds_mux->shift; |
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} else { |
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mux = (imx_ldb_ch == &ldb->channel[0]) ? 0 : 1; |
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} |
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/* set display clock mux back to original input clock */ |
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ret = clk_set_parent(ldb->clk_sel[mux], ldb->clk_parent[mux]); |
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if (ret) |
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dev_err(ldb->dev, |
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"unable to set di%d parent clock to original parent\n", |
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mux); |
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drm_panel_unprepare(imx_ldb_ch->panel); |
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} |
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static int imx_ldb_encoder_atomic_check(struct drm_encoder *encoder, |
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struct drm_crtc_state *crtc_state, |
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struct drm_connector_state *conn_state) |
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{ |
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struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state); |
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struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder); |
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struct drm_display_info *di = &conn_state->connector->display_info; |
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u32 bus_format = imx_ldb_ch->bus_format; |
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/* Bus format description in DT overrides connector display info. */ |
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if (!bus_format && di->num_bus_formats) { |
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bus_format = di->bus_formats[0]; |
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imx_crtc_state->bus_flags = di->bus_flags; |
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} else { |
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bus_format = imx_ldb_ch->bus_format; |
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imx_crtc_state->bus_flags = imx_ldb_ch->bus_flags; |
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} |
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switch (bus_format) { |
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case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG: |
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imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB666_1X18; |
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break; |
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case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG: |
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case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA: |
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imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24; |
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break; |
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default: |
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return -EINVAL; |
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} |
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imx_crtc_state->di_hsync_pin = 2; |
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imx_crtc_state->di_vsync_pin = 3; |
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return 0; |
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} |
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static const struct drm_connector_funcs imx_ldb_connector_funcs = { |
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.fill_modes = drm_helper_probe_single_connector_modes, |
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.destroy = imx_drm_connector_destroy, |
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.reset = drm_atomic_helper_connector_reset, |
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.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, |
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.atomic_destroy_state = drm_atomic_helper_connector_destroy_state, |
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}; |
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static const struct drm_connector_helper_funcs imx_ldb_connector_helper_funcs = { |
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.get_modes = imx_ldb_connector_get_modes, |
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}; |
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static const struct drm_encoder_helper_funcs imx_ldb_encoder_helper_funcs = { |
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.atomic_mode_set = imx_ldb_encoder_atomic_mode_set, |
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.enable = imx_ldb_encoder_enable, |
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.disable = imx_ldb_encoder_disable, |
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.atomic_check = imx_ldb_encoder_atomic_check, |
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}; |
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static int imx_ldb_get_clk(struct imx_ldb *ldb, int chno) |
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{ |
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char clkname[16]; |
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snprintf(clkname, sizeof(clkname), "di%d", chno); |
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ldb->clk[chno] = devm_clk_get(ldb->dev, clkname); |
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if (IS_ERR(ldb->clk[chno])) |
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return PTR_ERR(ldb->clk[chno]); |
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snprintf(clkname, sizeof(clkname), "di%d_pll", chno); |
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ldb->clk_pll[chno] = devm_clk_get(ldb->dev, clkname); |
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return PTR_ERR_OR_ZERO(ldb->clk_pll[chno]); |
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} |
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static int imx_ldb_register(struct drm_device *drm, |
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struct imx_ldb_channel *imx_ldb_ch) |
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{ |
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struct imx_ldb *ldb = imx_ldb_ch->ldb; |
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struct imx_ldb_encoder *ldb_encoder; |
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struct drm_connector *connector; |
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struct drm_encoder *encoder; |
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int ret; |
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ldb_encoder = drmm_simple_encoder_alloc(drm, struct imx_ldb_encoder, |
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encoder, DRM_MODE_ENCODER_LVDS); |
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if (IS_ERR(ldb_encoder)) |
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return PTR_ERR(ldb_encoder); |
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ldb_encoder->channel = imx_ldb_ch; |
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connector = &ldb_encoder->connector; |
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encoder = &ldb_encoder->encoder; |
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ret = imx_drm_encoder_parse_of(drm, encoder, imx_ldb_ch->child); |
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if (ret) |
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return ret; |
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ret = imx_ldb_get_clk(ldb, imx_ldb_ch->chno); |
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if (ret) |
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return ret; |
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if (ldb->ldb_ctrl & LDB_SPLIT_MODE_EN) { |
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ret = imx_ldb_get_clk(ldb, 1); |
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if (ret) |
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return ret; |
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} |
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drm_encoder_helper_add(encoder, &imx_ldb_encoder_helper_funcs); |
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|
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if (imx_ldb_ch->bridge) { |
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ret = drm_bridge_attach(encoder, imx_ldb_ch->bridge, NULL, 0); |
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if (ret) |
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return ret; |
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} else { |
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/* |
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* We want to add the connector whenever there is no bridge |
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* that brings its own, not only when there is a panel. For |
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* historical reasons, the ldb driver can also work without |
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* a panel. |
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*/ |
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drm_connector_helper_add(connector, |
|
&imx_ldb_connector_helper_funcs); |
|
drm_connector_init_with_ddc(drm, connector, |
|
&imx_ldb_connector_funcs, |
|
DRM_MODE_CONNECTOR_LVDS, |
|
imx_ldb_ch->ddc); |
|
drm_connector_attach_encoder(connector, encoder); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
struct imx_ldb_bit_mapping { |
|
u32 bus_format; |
|
u32 datawidth; |
|
const char * const mapping; |
|
}; |
|
|
|
static const struct imx_ldb_bit_mapping imx_ldb_bit_mappings[] = { |
|
{ MEDIA_BUS_FMT_RGB666_1X7X3_SPWG, 18, "spwg" }, |
|
{ MEDIA_BUS_FMT_RGB888_1X7X4_SPWG, 24, "spwg" }, |
|
{ MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA, 24, "jeida" }, |
|
}; |
|
|
|
static u32 of_get_bus_format(struct device *dev, struct device_node *np) |
|
{ |
|
const char *bm; |
|
u32 datawidth = 0; |
|
int ret, i; |
|
|
|
ret = of_property_read_string(np, "fsl,data-mapping", &bm); |
|
if (ret < 0) |
|
return ret; |
|
|
|
of_property_read_u32(np, "fsl,data-width", &datawidth); |
|
|
|
for (i = 0; i < ARRAY_SIZE(imx_ldb_bit_mappings); i++) { |
|
if (!strcasecmp(bm, imx_ldb_bit_mappings[i].mapping) && |
|
datawidth == imx_ldb_bit_mappings[i].datawidth) |
|
return imx_ldb_bit_mappings[i].bus_format; |
|
} |
|
|
|
dev_err(dev, "invalid data mapping: %d-bit \"%s\"\n", datawidth, bm); |
|
|
|
return -ENOENT; |
|
} |
|
|
|
static struct bus_mux imx6q_lvds_mux[2] = { |
|
{ |
|
.reg = IOMUXC_GPR3, |
|
.shift = 6, |
|
.mask = IMX6Q_GPR3_LVDS0_MUX_CTL_MASK, |
|
}, { |
|
.reg = IOMUXC_GPR3, |
|
.shift = 8, |
|
.mask = IMX6Q_GPR3_LVDS1_MUX_CTL_MASK, |
|
} |
|
}; |
|
|
|
/* |
|
* For a device declaring compatible = "fsl,imx6q-ldb", "fsl,imx53-ldb", |
|
* of_match_device will walk through this list and take the first entry |
|
* matching any of its compatible values. Therefore, the more generic |
|
* entries (in this case fsl,imx53-ldb) need to be ordered last. |
|
*/ |
|
static const struct of_device_id imx_ldb_dt_ids[] = { |
|
{ .compatible = "fsl,imx6q-ldb", .data = imx6q_lvds_mux, }, |
|
{ .compatible = "fsl,imx53-ldb", .data = NULL, }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, imx_ldb_dt_ids); |
|
|
|
static int imx_ldb_panel_ddc(struct device *dev, |
|
struct imx_ldb_channel *channel, struct device_node *child) |
|
{ |
|
struct device_node *ddc_node; |
|
const u8 *edidp; |
|
int ret; |
|
|
|
ddc_node = of_parse_phandle(child, "ddc-i2c-bus", 0); |
|
if (ddc_node) { |
|
channel->ddc = of_find_i2c_adapter_by_node(ddc_node); |
|
of_node_put(ddc_node); |
|
if (!channel->ddc) { |
|
dev_warn(dev, "failed to get ddc i2c adapter\n"); |
|
return -EPROBE_DEFER; |
|
} |
|
} |
|
|
|
if (!channel->ddc) { |
|
int edid_len; |
|
|
|
/* if no DDC available, fallback to hardcoded EDID */ |
|
dev_dbg(dev, "no ddc available\n"); |
|
|
|
edidp = of_get_property(child, "edid", &edid_len); |
|
if (edidp) { |
|
channel->edid = kmemdup(edidp, edid_len, GFP_KERNEL); |
|
} else if (!channel->panel) { |
|
/* fallback to display-timings node */ |
|
ret = of_get_drm_display_mode(child, |
|
&channel->mode, |
|
&channel->bus_flags, |
|
OF_USE_NATIVE_MODE); |
|
if (!ret) |
|
channel->mode_valid = 1; |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
static int imx_ldb_bind(struct device *dev, struct device *master, void *data) |
|
{ |
|
struct drm_device *drm = data; |
|
struct imx_ldb *imx_ldb = dev_get_drvdata(dev); |
|
int ret; |
|
int i; |
|
|
|
for (i = 0; i < 2; i++) { |
|
struct imx_ldb_channel *channel = &imx_ldb->channel[i]; |
|
|
|
if (!channel->ldb) |
|
continue; |
|
|
|
ret = imx_ldb_register(drm, channel); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static const struct component_ops imx_ldb_ops = { |
|
.bind = imx_ldb_bind, |
|
}; |
|
|
|
static int imx_ldb_probe(struct platform_device *pdev) |
|
{ |
|
struct device *dev = &pdev->dev; |
|
struct device_node *np = dev->of_node; |
|
const struct of_device_id *of_id = of_match_device(imx_ldb_dt_ids, dev); |
|
struct device_node *child; |
|
struct imx_ldb *imx_ldb; |
|
int dual; |
|
int ret; |
|
int i; |
|
|
|
imx_ldb = devm_kzalloc(dev, sizeof(*imx_ldb), GFP_KERNEL); |
|
if (!imx_ldb) |
|
return -ENOMEM; |
|
|
|
imx_ldb->regmap = syscon_regmap_lookup_by_phandle(np, "gpr"); |
|
if (IS_ERR(imx_ldb->regmap)) { |
|
dev_err(dev, "failed to get parent regmap\n"); |
|
return PTR_ERR(imx_ldb->regmap); |
|
} |
|
|
|
/* disable LDB by resetting the control register to POR default */ |
|
regmap_write(imx_ldb->regmap, IOMUXC_GPR2, 0); |
|
|
|
imx_ldb->dev = dev; |
|
|
|
if (of_id) |
|
imx_ldb->lvds_mux = of_id->data; |
|
|
|
dual = of_property_read_bool(np, "fsl,dual-channel"); |
|
if (dual) |
|
imx_ldb->ldb_ctrl |= LDB_SPLIT_MODE_EN; |
|
|
|
/* |
|
* There are three different possible clock mux configurations: |
|
* i.MX53: ipu1_di0_sel, ipu1_di1_sel |
|
* i.MX6q: ipu1_di0_sel, ipu1_di1_sel, ipu2_di0_sel, ipu2_di1_sel |
|
* i.MX6dl: ipu1_di0_sel, ipu1_di1_sel, lcdif_sel |
|
* Map them all to di0_sel...di3_sel. |
|
*/ |
|
for (i = 0; i < 4; i++) { |
|
char clkname[16]; |
|
|
|
sprintf(clkname, "di%d_sel", i); |
|
imx_ldb->clk_sel[i] = devm_clk_get(imx_ldb->dev, clkname); |
|
if (IS_ERR(imx_ldb->clk_sel[i])) { |
|
ret = PTR_ERR(imx_ldb->clk_sel[i]); |
|
imx_ldb->clk_sel[i] = NULL; |
|
break; |
|
} |
|
|
|
imx_ldb->clk_parent[i] = clk_get_parent(imx_ldb->clk_sel[i]); |
|
} |
|
if (i == 0) |
|
return ret; |
|
|
|
for_each_child_of_node(np, child) { |
|
struct imx_ldb_channel *channel; |
|
int bus_format; |
|
|
|
ret = of_property_read_u32(child, "reg", &i); |
|
if (ret || i < 0 || i > 1) { |
|
ret = -EINVAL; |
|
goto free_child; |
|
} |
|
|
|
if (!of_device_is_available(child)) |
|
continue; |
|
|
|
if (dual && i > 0) { |
|
dev_warn(dev, "dual-channel mode, ignoring second output\n"); |
|
continue; |
|
} |
|
|
|
channel = &imx_ldb->channel[i]; |
|
channel->ldb = imx_ldb; |
|
channel->chno = i; |
|
|
|
/* |
|
* The output port is port@4 with an external 4-port mux or |
|
* port@2 with the internal 2-port mux. |
|
*/ |
|
ret = drm_of_find_panel_or_bridge(child, |
|
imx_ldb->lvds_mux ? 4 : 2, 0, |
|
&channel->panel, &channel->bridge); |
|
if (ret && ret != -ENODEV) |
|
goto free_child; |
|
|
|
/* panel ddc only if there is no bridge */ |
|
if (!channel->bridge) { |
|
ret = imx_ldb_panel_ddc(dev, channel, child); |
|
if (ret) |
|
goto free_child; |
|
} |
|
|
|
bus_format = of_get_bus_format(dev, child); |
|
if (bus_format == -EINVAL) { |
|
/* |
|
* If no bus format was specified in the device tree, |
|
* we can still get it from the connected panel later. |
|
*/ |
|
if (channel->panel && channel->panel->funcs && |
|
channel->panel->funcs->get_modes) |
|
bus_format = 0; |
|
} |
|
if (bus_format < 0) { |
|
dev_err(dev, "could not determine data mapping: %d\n", |
|
bus_format); |
|
ret = bus_format; |
|
goto free_child; |
|
} |
|
channel->bus_format = bus_format; |
|
channel->child = child; |
|
} |
|
|
|
platform_set_drvdata(pdev, imx_ldb); |
|
|
|
return component_add(&pdev->dev, &imx_ldb_ops); |
|
|
|
free_child: |
|
of_node_put(child); |
|
return ret; |
|
} |
|
|
|
static int imx_ldb_remove(struct platform_device *pdev) |
|
{ |
|
struct imx_ldb *imx_ldb = platform_get_drvdata(pdev); |
|
int i; |
|
|
|
for (i = 0; i < 2; i++) { |
|
struct imx_ldb_channel *channel = &imx_ldb->channel[i]; |
|
|
|
kfree(channel->edid); |
|
i2c_put_adapter(channel->ddc); |
|
} |
|
|
|
component_del(&pdev->dev, &imx_ldb_ops); |
|
return 0; |
|
} |
|
|
|
static struct platform_driver imx_ldb_driver = { |
|
.probe = imx_ldb_probe, |
|
.remove = imx_ldb_remove, |
|
.driver = { |
|
.of_match_table = imx_ldb_dt_ids, |
|
.name = DRIVER_NAME, |
|
}, |
|
}; |
|
|
|
module_platform_driver(imx_ldb_driver); |
|
|
|
MODULE_DESCRIPTION("i.MX LVDS driver"); |
|
MODULE_AUTHOR("Sascha Hauer, Pengutronix"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS("platform:" DRIVER_NAME);
|
|
|