drm/bridge: tc358768: Support pulse mode

Support pulse-mode synchronization which is supported and used by simple
DSI panels like Panasonic VVX10F004B00.

Tested-by: Andreas Westman Dorcsak <hedmoo@yahoo.com> # Asus TF700T
Tested-by: Maxim Schwalm <maxim.schwalm@gmail.com> #TF700T
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211002233447.1105-3-digetx@gmail.com

drivers/gpu/drm/bridge/tc358768.c

@@ -785,24 +785,54 @@ static void tc358768_bridge_pre_enable(struct drm_bridge *bridge)
 	/* START[0] */
 	tc358768_write(priv, TC358768_STARTCNTRL, 1);
 
-	/* Set event mode */
-	tc358768_write(priv, TC358768_DSI_EVENT, 1);
-
-	/* vsw (+ vbp) */
-	tc358768_write(priv, TC358768_DSI_VSW,
-		       mode->vtotal - mode->vsync_start);
-	/* vbp (not used in event mode) */
-	tc358768_write(priv, TC358768_DSI_VBPR, 0);
-	/* vact */
-	tc358768_write(priv, TC358768_DSI_VACT, mode->vdisplay);
-
-	/* (hsw + hbp) * byteclk * ndl / pclk */
-	val = (u32)div_u64((mode->htotal - mode->hsync_start) *
-			   ((u64)priv->dsiclk / 4) * priv->dsi_lanes,
-			   mode->clock * 1000);
-	tc358768_write(priv, TC358768_DSI_HSW, val);
-	/* hbp (not used in event mode) */
-	tc358768_write(priv, TC358768_DSI_HBPR, 0);
+	if (dsi_dev->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {
+		/* Set pulse mode */
+		tc358768_write(priv, TC358768_DSI_EVENT, 0);
+
+		/* vact */
+		tc358768_write(priv, TC358768_DSI_VACT, mode->vdisplay);
+
+		/* vsw */
+		tc358768_write(priv, TC358768_DSI_VSW,
+			       mode->vsync_end - mode->vsync_start);
+		/* vbp */
+		tc358768_write(priv, TC358768_DSI_VBPR,
+			       mode->vtotal - mode->vsync_end);
+
+		/* hsw * byteclk * ndl / pclk */
+		val = (u32)div_u64((mode->hsync_end - mode->hsync_start) *
+				   ((u64)priv->dsiclk / 4) * priv->dsi_lanes,
+				   mode->clock * 1000);
+		tc358768_write(priv, TC358768_DSI_HSW, val);
+
+		/* hbp * byteclk * ndl / pclk */
+		val = (u32)div_u64((mode->htotal - mode->hsync_end) *
+				   ((u64)priv->dsiclk / 4) * priv->dsi_lanes,
+				   mode->clock * 1000);
+		tc358768_write(priv, TC358768_DSI_HBPR, val);
+	} else {
+		/* Set event mode */
+		tc358768_write(priv, TC358768_DSI_EVENT, 1);
+
+		/* vact */
+		tc358768_write(priv, TC358768_DSI_VACT, mode->vdisplay);
+
+		/* vsw (+ vbp) */
+		tc358768_write(priv, TC358768_DSI_VSW,
+			       mode->vtotal - mode->vsync_start);
+		/* vbp (not used in event mode) */
+		tc358768_write(priv, TC358768_DSI_VBPR, 0);
+
+		/* (hsw + hbp) * byteclk * ndl / pclk */
+		val = (u32)div_u64((mode->htotal - mode->hsync_start) *
+				   ((u64)priv->dsiclk / 4) * priv->dsi_lanes,
+				   mode->clock * 1000);
+		tc358768_write(priv, TC358768_DSI_HSW, val);
+
+		/* hbp (not used in event mode) */
+		tc358768_write(priv, TC358768_DSI_HBPR, 0);
+	}
+
 	/* hact (bytes) */
 	tc358768_write(priv, TC358768_DSI_HACT, hact);