[v5,16/16] drm/bridge: ti-sn65dsi86: Remove drm_encoder->crtc use

Commit Message

Maxime Ripard March 4, 2025, 11:10 a.m. UTC

The TI sn65dsi86 driver follows the drm_encoder->crtc pointer that is
deprecated and shouldn't be used by atomic drivers.

Fortunately, the atomic hooks provide the drm_atomic_state and we can
access our current CRTC from that, going from the bridge to its encoder,
to its connector, and to its CRTC.

This bridge driver uses the atomic hooks already, but dereferences the
drm_encoder->crtc pointer in functions that don't have access to it.

Let's rework the driver to pass the state where needed, and remove the
need for the drm_encoder->crtc dereference.

Reviewed-by: Douglas Anderson <[e-mail]>
Tested-by: Douglas Anderson <[e-mail]>
Signed-off-by: Maxime Ripard <[e-mail]>
---
 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 55 ++++++++++++++++++++++++-----------
 1 file changed, 38 insertions(+), 17 deletions(-)

Patch

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 190929a41abd1d8d6619e27bb9391f75145ed64a..fd68ad2e27186c24cef20dd4ae20decdd6da4a2e 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -241,15 +241,30 @@  static void ti_sn65dsi86_write_u16(struct ti_sn65dsi86 *pdata,
 	u8 buf[2] = { val & 0xff, val >> 8 };
 
 	regmap_bulk_write(pdata->regmap, reg, buf, ARRAY_SIZE(buf));
 }
 
-static u32 ti_sn_bridge_get_dsi_freq(struct ti_sn65dsi86 *pdata)
+static struct drm_display_mode *
+get_new_adjusted_display_mode(struct drm_bridge *bridge,
+			      struct drm_atomic_state *state)
+{
+	struct drm_connector *connector =
+		drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
+	struct drm_connector_state *conn_state =
+		drm_atomic_get_new_connector_state(state, connector);
+	struct drm_crtc_state *crtc_state =
+		drm_atomic_get_new_crtc_state(state, conn_state->crtc);
+
+	return &crtc_state->adjusted_mode;
+}
+
+static u32 ti_sn_bridge_get_dsi_freq(struct ti_sn65dsi86 *pdata,
+				     struct drm_atomic_state *state)
 {
 	u32 bit_rate_khz, clk_freq_khz;
 	struct drm_display_mode *mode =
-		&pdata->bridge.encoder->crtc->state->adjusted_mode;
+		get_new_adjusted_display_mode(&pdata->bridge, state);
 
 	bit_rate_khz = mode->clock *
 			mipi_dsi_pixel_format_to_bpp(pdata->dsi->format);
 	clk_freq_khz = bit_rate_khz / (pdata->dsi->lanes * 2);
 
@@ -272,11 +287,12 @@  static const u32 ti_sn_bridge_dsiclk_lut[] = {
 	416000000,
 	486000000,
 	460800000,
 };
 
-static void ti_sn_bridge_set_refclk_freq(struct ti_sn65dsi86 *pdata)
+static void ti_sn_bridge_set_refclk_freq(struct ti_sn65dsi86 *pdata,
+					 struct drm_atomic_state *state)
 {
 	int i;
 	u32 refclk_rate;
 	const u32 *refclk_lut;
 	size_t refclk_lut_size;
@@ -285,11 +301,11 @@  static void ti_sn_bridge_set_refclk_freq(struct ti_sn65dsi86 *pdata)
 		refclk_rate = clk_get_rate(pdata->refclk);
 		refclk_lut = ti_sn_bridge_refclk_lut;
 		refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_refclk_lut);
 		clk_prepare_enable(pdata->refclk);
 	} else {
-		refclk_rate = ti_sn_bridge_get_dsi_freq(pdata) * 1000;
+		refclk_rate = ti_sn_bridge_get_dsi_freq(pdata, state) * 1000;
 		refclk_lut = ti_sn_bridge_dsiclk_lut;
 		refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_dsiclk_lut);
 	}
 
 	/* for i equals to refclk_lut_size means default frequency */
@@ -309,16 +325,17 @@  static void ti_sn_bridge_set_refclk_freq(struct ti_sn65dsi86 *pdata)
 	 * regardless of its actual sourcing.
 	 */
 	pdata->pwm_refclk_freq = ti_sn_bridge_refclk_lut[i];
 }
 
-static void ti_sn65dsi86_enable_comms(struct ti_sn65dsi86 *pdata)
+static void ti_sn65dsi86_enable_comms(struct ti_sn65dsi86 *pdata,
+				      struct drm_atomic_state *state)
 {
 	mutex_lock(&pdata->comms_mutex);
 
 	/* configure bridge ref_clk */
-	ti_sn_bridge_set_refclk_freq(pdata);
+	ti_sn_bridge_set_refclk_freq(pdata, state);
 
 	/*
 	 * HPD on this bridge chip is a bit useless.  This is an eDP bridge
 	 * so the HPD is an internal signal that's only there to signal that
 	 * the panel is done powering up.  ...but the bridge chip debounces
@@ -374,11 +391,11 @@  static int __maybe_unused ti_sn65dsi86_resume(struct device *dev)
 	 * so we can do it in resume which lets us read the EDID before
 	 * pre_enable(). Without a reference clock we need the MIPI reference
 	 * clock so reading early doesn't work.
 	 */
 	if (pdata->refclk)
-		ti_sn65dsi86_enable_comms(pdata);
+		ti_sn65dsi86_enable_comms(pdata, NULL);
 
 	return ret;
 }
 
 static int __maybe_unused ti_sn65dsi86_suspend(struct device *dev)
@@ -820,16 +837,17 @@  static void ti_sn_bridge_atomic_disable(struct drm_bridge *bridge,
 
 	/* disable video stream */
 	regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG, VSTREAM_ENABLE, 0);
 }
 
-static void ti_sn_bridge_set_dsi_rate(struct ti_sn65dsi86 *pdata)
+static void ti_sn_bridge_set_dsi_rate(struct ti_sn65dsi86 *pdata,
+				      struct drm_atomic_state *state)
 {
 	unsigned int bit_rate_mhz, clk_freq_mhz;
 	unsigned int val;
 	struct drm_display_mode *mode =
-		&pdata->bridge.encoder->crtc->state->adjusted_mode;
+		get_new_adjusted_display_mode(&pdata->bridge, state);
 
 	/* set DSIA clk frequency */
 	bit_rate_mhz = (mode->clock / 1000) *
 			mipi_dsi_pixel_format_to_bpp(pdata->dsi->format);
 	clk_freq_mhz = bit_rate_mhz / (pdata->dsi->lanes * 2);
@@ -855,16 +873,18 @@  static unsigned int ti_sn_bridge_get_bpp(struct drm_connector *connector)
  */
 static const unsigned int ti_sn_bridge_dp_rate_lut[] = {
 	0, 1620, 2160, 2430, 2700, 3240, 4320, 5400
 };
 
-static int ti_sn_bridge_calc_min_dp_rate_idx(struct ti_sn65dsi86 *pdata, unsigned int bpp)
+static int ti_sn_bridge_calc_min_dp_rate_idx(struct ti_sn65dsi86 *pdata,
+					     struct drm_atomic_state *state,
+					     unsigned int bpp)
 {
 	unsigned int bit_rate_khz, dp_rate_mhz;
 	unsigned int i;
 	struct drm_display_mode *mode =
-		&pdata->bridge.encoder->crtc->state->adjusted_mode;
+		get_new_adjusted_display_mode(&pdata->bridge, state);
 
 	/* Calculate minimum bit rate based on our pixel clock. */
 	bit_rate_khz = mode->clock * bpp;
 
 	/* Calculate minimum DP data rate, taking 80% as per DP spec */
@@ -959,14 +979,15 @@  static unsigned int ti_sn_bridge_read_valid_rates(struct ti_sn65dsi86 *pdata)
 	}
 
 	return valid_rates;
 }
 
-static void ti_sn_bridge_set_video_timings(struct ti_sn65dsi86 *pdata)
+static void ti_sn_bridge_set_video_timings(struct ti_sn65dsi86 *pdata,
+					   struct drm_atomic_state *state)
 {
 	struct drm_display_mode *mode =
-		&pdata->bridge.encoder->crtc->state->adjusted_mode;
+		get_new_adjusted_display_mode(&pdata->bridge, state);
 	u8 hsync_polarity = 0, vsync_polarity = 0;
 
 	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
 		hsync_polarity = CHA_HSYNC_POLARITY;
 	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
@@ -1104,11 +1125,11 @@  static void ti_sn_bridge_atomic_enable(struct drm_bridge *bridge,
 	regmap_write(pdata->regmap, SN_LN_ASSIGN_REG, pdata->ln_assign);
 	regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG, LN_POLRS_MASK,
 			   pdata->ln_polrs << LN_POLRS_OFFSET);
 
 	/* set dsi clk frequency value */
-	ti_sn_bridge_set_dsi_rate(pdata);
+	ti_sn_bridge_set_dsi_rate(pdata, state);
 
 	/*
 	 * The SN65DSI86 only supports ASSR Display Authentication method and
 	 * this method is enabled for eDP panels. An eDP panel must support this
 	 * authentication method. We need to enable this method in the eDP panel
@@ -1139,11 +1160,11 @@  static void ti_sn_bridge_atomic_enable(struct drm_bridge *bridge,
 			   val);
 
 	valid_rates = ti_sn_bridge_read_valid_rates(pdata);
 
 	/* Train until we run out of rates */
-	for (dp_rate_idx = ti_sn_bridge_calc_min_dp_rate_idx(pdata, bpp);
+	for (dp_rate_idx = ti_sn_bridge_calc_min_dp_rate_idx(pdata, state, bpp);
 	     dp_rate_idx < ARRAY_SIZE(ti_sn_bridge_dp_rate_lut);
 	     dp_rate_idx++) {
 		if (!(valid_rates & BIT(dp_rate_idx)))
 			continue;
 
@@ -1155,11 +1176,11 @@  static void ti_sn_bridge_atomic_enable(struct drm_bridge *bridge,
 		DRM_DEV_ERROR(pdata->dev, "%s (%d)\n", last_err_str, ret);
 		return;
 	}
 
 	/* config video parameters */
-	ti_sn_bridge_set_video_timings(pdata);
+	ti_sn_bridge_set_video_timings(pdata, state);
 
 	/* enable video stream */
 	regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG, VSTREAM_ENABLE,
 			   VSTREAM_ENABLE);
 }
@@ -1170,11 +1191,11 @@  static void ti_sn_bridge_atomic_pre_enable(struct drm_bridge *bridge,
 	struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge);
 
 	pm_runtime_get_sync(pdata->dev);
 
 	if (!pdata->refclk)
-		ti_sn65dsi86_enable_comms(pdata);
+		ti_sn65dsi86_enable_comms(pdata, state);
 
 	/* td7: min 100 us after enable before DSI data */
 	usleep_range(100, 110);
 }