drm/omap: Move bus flag hack to encoder implementation

The bus flags stored in omap_dss_device instances are used to fixup the
video mode before setting it, to honour constraints that can't be
expressed through drm_display_mode. The fixup occurs in the CRTC mode
set operation and the resulting video mode is stored internally in the
CRTC. It is then used next by omap_encoder_enable() to apply mode fixups
for the omap_dss_device instances in omap_encoder_update().

Move the hack to the omap_encoder_update() function right before
applying the omap_dss_device fixups, in order to group all fixups
together.
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_crtc.c

@@ -420,8 +420,6 @@ static void omap_crtc_mode_set_nofb(struct drm_crtc *crtc)
 {
 	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 	struct drm_display_mode *mode = &crtc->state->adjusted_mode;
-	struct videomode *vm = &omap_crtc->vm;
-	struct omap_dss_device *dssdev;
 
 	DBG("%s: set mode: %d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x",
 	    omap_crtc->name, mode->base.id, mode->name,
@@ -430,45 +428,7 @@ static void omap_crtc_mode_set_nofb(struct drm_crtc *crtc)
 	    mode->vdisplay, mode->vsync_start, mode->vsync_end, mode->vtotal,
 	    mode->type, mode->flags);
 
-	drm_display_mode_to_videomode(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 from the panel drivers.
-	 *
-	 * A better solution is to use DRM's bus-flags through the whole driver.
-	 */
-
-	for (dssdev = omap_crtc->pipe->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;
-		}
-	}
+	drm_display_mode_to_videomode(mode, &omap_crtc->vm);
 }
 
 static int omap_crtc_atomic_check(struct drm_crtc *crtc,

drivers/gpu/drm/omapdrm/omap_encoder.c

@@ -103,13 +103,49 @@ static int omap_encoder_update(struct drm_encoder *encoder,
 	int ret;
 
 	for (dssdev = omap_encoder->output; dssdev; dssdev = dssdev->next) {
-		if (!dssdev->ops->check_timings)
-			continue;
+		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;
+		}
 
-		ret = dssdev->ops->check_timings(dssdev, vm);
-		if (ret) {
-			dev_err(dev->dev, "invalid timings: %d\n", ret);
-			return ret;
+		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;
 		}
 	}