drm/bridge: ti-sn65dsi86: Remove drm_encoder->crtc use

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]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
Signed-off-by: Maxime Ripard <[e-mail]>

drivers/gpu/drm/bridge/ti-sn65dsi86.c

···
 	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);
···
 	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;
···
 		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);
 	}
···
 	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
···
 	 * clock so reading early doesn't work.
 	 */
 	if (pdata->refclk)
-		ti_sn65dsi86_enable_comms(pdata);
+		ti_sn65dsi86_enable_comms(pdata, NULL);
 
 	return ret;
 }
···
 	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) *
···
 	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;
···
 	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)
···
 			   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
···
 	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)))
···
 	}
 
 	/* 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,
···
 	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);