drm/omap: Split mode fixup and mode set from encoder enable

The encoder enable operation currently performs mode fixup and mode
setting for all omap_dss_device instances in the display pipeline. There
are dedicated encoder operations for those operations (respectively
.atomic_check() and .mode_set()), but they are not used for this
purpose.

Move the mode fixup code to .atomic_check() and the mode set code
.mode_set() to better fit the KMS model. The bus flags fixup has to
happen at .mode_set() time as there is no place to store the bus flags
in the atomic state structures. This could be solved by extending one of
the state structures, but as the goal is to replace the fixup by direct
usage of bus flags through the driver, that would be pointless.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/omap_encoder.c

@@ -53,16 +53,69 @@ static const struct drm_encoder_funcs omap_encoder_funcs = {
 };
 
 static void omap_encoder_mode_set(struct drm_encoder *encoder,
-				struct drm_display_mode *mode,
-				struct drm_display_mode *adjusted_mode)
+				  struct drm_display_mode *mode,
+				  struct drm_display_mode *adjusted_mode)
 {
 	struct drm_device *dev = encoder->dev;
 	struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
-	struct omap_dss_device *dssdev = omap_encoder->output;
+	struct omap_dss_device *display = omap_encoder->display;
 	struct drm_connector *connector;
+	struct omap_dss_device *dssdev;
+	struct videomode vm = { 0 };
 	bool hdmi_mode;
 	int r;
 
+	drm_display_mode_to_videomode(adjusted_mode, &vm);
+
+	/*
+	 * HACK: This fixes the vm flags.
+	 * struct drm_display_mode does not contain the VSYNC/HSYNC/DE flags and
+	 * they get lost when converting back and forth between struct
+	 * drm_display_mode and struct videomode. The hack below goes and
+	 * fetches the missing flags.
+	 *
+	 * A better solution is to use DRM's bus-flags through the whole driver.
+	 */
+	for (dssdev = omap_encoder->output; dssdev; dssdev = dssdev->next) {
+		unsigned long bus_flags = dssdev->bus_flags;
+
+		if (!(vm.flags & (DISPLAY_FLAGS_DE_LOW |
+				  DISPLAY_FLAGS_DE_HIGH))) {
+			if (bus_flags & DRM_BUS_FLAG_DE_LOW)
+				vm.flags |= DISPLAY_FLAGS_DE_LOW;
+			else if (bus_flags & DRM_BUS_FLAG_DE_HIGH)
+				vm.flags |= DISPLAY_FLAGS_DE_HIGH;
+		}
+
+		if (!(vm.flags & (DISPLAY_FLAGS_PIXDATA_POSEDGE |
+				  DISPLAY_FLAGS_PIXDATA_NEGEDGE))) {
+			if (bus_flags & DRM_BUS_FLAG_PIXDATA_POSEDGE)
+				vm.flags |= DISPLAY_FLAGS_PIXDATA_POSEDGE;
+			else if (bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE)
+				vm.flags |= DISPLAY_FLAGS_PIXDATA_NEGEDGE;
+		}
+
+		if (!(vm.flags & (DISPLAY_FLAGS_SYNC_POSEDGE |
+				  DISPLAY_FLAGS_SYNC_NEGEDGE))) {
+			if (bus_flags & DRM_BUS_FLAG_SYNC_POSEDGE)
+				vm.flags |= DISPLAY_FLAGS_SYNC_POSEDGE;
+			else if (bus_flags & DRM_BUS_FLAG_SYNC_NEGEDGE)
+				vm.flags |= DISPLAY_FLAGS_SYNC_NEGEDGE;
+		}
+	}
+
+	/*
+	 * HACK: Call the .set_timings() operation if available, this will
+	 * eventually store timings in the CRTC. Otherwise (for DSI outputs)
+	 * store the timings directly.
+	 *
+	 * All outputs should be brought in sync to operate similarly.
+	 */
+	if (display->ops->set_timings)
+		display->ops->set_timings(display, &vm);
+	else
+		*omap_crtc_timings(encoder->crtc) = vm;
+
 	hdmi_mode = false;
 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 		if (connector->encoder == encoder) {
@@ -71,6 +124,8 @@ static void omap_encoder_mode_set(struct drm_encoder *encoder,
 		}
 	}
 
+	dssdev = omap_encoder->output;
+
 	if (dssdev->ops->hdmi.set_hdmi_mode)
 		dssdev->ops->hdmi.set_hdmi_mode(dssdev, hdmi_mode);
 
@@ -92,78 +147,12 @@ static void omap_encoder_disable(struct drm_encoder *encoder)
 	dssdev->ops->disable(dssdev);
 }
 
-static int omap_encoder_update(struct drm_encoder *encoder,
-			       enum omap_channel channel,
-			       struct videomode *vm)
-{
-	struct drm_device *dev = encoder->dev;
-	struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
-	struct omap_dss_device *display = omap_encoder->display;
-	struct omap_dss_device *dssdev;
-	int ret;
-
-	for (dssdev = omap_encoder->output; dssdev; dssdev = dssdev->next) {
-		unsigned long bus_flags = dssdev->bus_flags;
-
-		if (dssdev->ops->check_timings) {
-			ret = dssdev->ops->check_timings(dssdev, vm);
-			if (ret) {
-				dev_err(dev->dev, "invalid timings: %d\n", ret);
-				return ret;
-			}
-		}
-
-		/*
-		 * HACK: This fixes the vm flags.
-		 * struct drm_display_mode does not contain the VSYNC/HSYNC/DE
-		 * flags and they get lost when converting back and forth
-		 * between struct drm_display_mode and struct videomode. The
-		 * hack below goes and fetches the missing flags.
-		 *
-		 * A better solution is to use DRM's bus-flags through the whole
-		 * driver.
-		 */
-
-		if (!(vm->flags & (DISPLAY_FLAGS_DE_LOW |
-				   DISPLAY_FLAGS_DE_HIGH))) {
-			if (bus_flags & DRM_BUS_FLAG_DE_LOW)
-				vm->flags |= DISPLAY_FLAGS_DE_LOW;
-			else if (bus_flags & DRM_BUS_FLAG_DE_HIGH)
-				vm->flags |= DISPLAY_FLAGS_DE_HIGH;
-		}
-
-		if (!(vm->flags & (DISPLAY_FLAGS_PIXDATA_POSEDGE |
-				   DISPLAY_FLAGS_PIXDATA_NEGEDGE))) {
-			if (bus_flags & DRM_BUS_FLAG_PIXDATA_POSEDGE)
-				vm->flags |= DISPLAY_FLAGS_PIXDATA_POSEDGE;
-			else if (bus_flags & DRM_BUS_FLAG_PIXDATA_NEGEDGE)
-				vm->flags |= DISPLAY_FLAGS_PIXDATA_NEGEDGE;
-		}
-
-		if (!(vm->flags & (DISPLAY_FLAGS_SYNC_POSEDGE |
-				   DISPLAY_FLAGS_SYNC_NEGEDGE))) {
-			if (bus_flags & DRM_BUS_FLAG_SYNC_POSEDGE)
-				vm->flags |= DISPLAY_FLAGS_SYNC_POSEDGE;
-			else if (bus_flags & DRM_BUS_FLAG_SYNC_NEGEDGE)
-				vm->flags |= DISPLAY_FLAGS_SYNC_NEGEDGE;
-		}
-	}
-
-	if (display->ops->set_timings)
-		display->ops->set_timings(display, vm);
-
-	return 0;
-}
-
 static void omap_encoder_enable(struct drm_encoder *encoder)
 {
 	struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
 	struct omap_dss_device *dssdev = omap_encoder->display;
 	int r;
 
-	omap_encoder_update(encoder, omap_crtc_channel(encoder->crtc),
-			    omap_crtc_timings(encoder->crtc));
-
 	r = dssdev->ops->enable(dssdev);
 	if (r)
 		dev_err(encoder->dev->dev,
@@ -175,6 +164,27 @@ static int omap_encoder_atomic_check(struct drm_encoder *encoder,
 				     struct drm_crtc_state *crtc_state,
 				     struct drm_connector_state *conn_state)
 {
+	struct omap_encoder *omap_encoder = to_omap_encoder(encoder);
+	struct drm_device *dev = encoder->dev;
+	struct omap_dss_device *dssdev;
+	struct videomode vm = { 0 };
+	int ret;
+
+	drm_display_mode_to_videomode(&crtc_state->mode, &vm);
+
+	for (dssdev = omap_encoder->output; dssdev; dssdev = dssdev->next) {
+		if (!dssdev->ops->check_timings)
+			continue;
+
+		ret = dssdev->ops->check_timings(dssdev, &vm);
+		if (ret) {
+			dev_err(dev->dev, "invalid timings: %d\n", ret);
+			return ret;
+		}
+	}
+
+	drm_display_mode_from_videomode(&vm, &crtc_state->adjusted_mode);
+
 	return 0;
 }