[PATCHv3 28/30] drm/omap: fix display SYNC/DE flags

[Tomi Valkeinen]

At the moment VSYNC/HSYNC/DE high/low flags set by the panel/encoder
drivers get lost when the videotimings are translated to DRM's
videomode, as DRM's mode does not have corresponding flags.

DRM has bus-flags for this purpose, and while it lacks a few flags at
the moment, it should be used here. However, until we rewrite omapdrm's
device model, using bus-flags is rather difficult.

As a short term fix, this patch makes sure that every time the videomode
is set in omap_crtc_mode_set_nofb(), the driver asks for the SYNC/DE
flags from the panel/encoder drivers, and thus we get the correct flags
into use.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen at ti.com>
---
 drivers/gpu/drm/omapdrm/omap_connector.c |  2 --
 drivers/gpu/drm/omapdrm/omap_crtc.c      | 28 +++++++++++++++++++++++++---
 2 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/omap_connector.c b/drivers/gpu/drm/omapdrm/omap_connector.c
index 50d2b641c28b..d62c035f050f 100644
--- a/drivers/gpu/drm/omapdrm/omap_connector.c
+++ b/drivers/gpu/drm/omapdrm/omap_connector.c
@@ -146,8 +146,6 @@ static int omap_connector_mode_valid(struct drm_connector *connector,
 	int r, ret = MODE_BAD;
 
 	drm_display_mode_to_videomode(mode, &vm);
-	vm.flags |= DISPLAY_FLAGS_DE_HIGH | DISPLAY_FLAGS_PIXDATA_POSEDGE |
-		    DISPLAY_FLAGS_SYNC_NEGEDGE;
 	mode->vrefresh = drm_mode_vrefresh(mode);
 
 	/*
diff --git a/drivers/gpu/drm/omapdrm/omap_crtc.c b/drivers/gpu/drm/omapdrm/omap_crtc.c
index 1db96b077ae8..606ef807741a 100644
--- a/drivers/gpu/drm/omapdrm/omap_crtc.c
+++ b/drivers/gpu/drm/omapdrm/omap_crtc.c
@@ -373,6 +373,11 @@ 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 omap_drm_private *priv = crtc->dev->dev_private;
+	const u32 flags_mask = DISPLAY_FLAGS_DE_HIGH | DISPLAY_FLAGS_DE_LOW |
+		DISPLAY_FLAGS_PIXDATA_POSEDGE | DISPLAY_FLAGS_PIXDATA_NEGEDGE |
+		DISPLAY_FLAGS_SYNC_POSEDGE | DISPLAY_FLAGS_SYNC_NEGEDGE;
+	int i;
 
 	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,
@@ -382,9 +387,26 @@ static void omap_crtc_mode_set_nofb(struct drm_crtc *crtc)
 	    mode->type, mode->flags);
 
 	drm_display_mode_to_videomode(mode, &omap_crtc->vm);
-	omap_crtc->vm.flags |= DISPLAY_FLAGS_DE_HIGH |
-			       DISPLAY_FLAGS_PIXDATA_POSEDGE |
-			       DISPLAY_FLAGS_SYNC_NEGEDGE;
+
+	for (i = 0; i < priv->num_encoders; ++i) {
+		struct drm_encoder *encoder = priv->encoders[i];
+
+		if (encoder->crtc == crtc) {
+			struct omap_dss_device *dssdev;
+
+			dssdev = omap_encoder_get_dssdev(encoder);
+
+			if (dssdev) {
+				struct videomode vm = {0};
+
+				dssdev->driver->get_timings(dssdev, &vm);
+
+				omap_crtc->vm.flags |= vm.flags & flags_mask;
+			}
+
+			break;
+		}
+	}
 }
 
 static int omap_crtc_atomic_check(struct drm_crtc *crtc,
-- 
2.7.4