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drm/omap: fix display SYNC/DE flags

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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@ti.com>
This commit is contained in:
Tomi Valkeinen
2016-11-23 13:24:00 +02:00
parent 956d4f9308
commit 50fa9f0bb8
2 changed files with 43 additions and 5 deletions
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40
drivers/gpu/drm/omapdrm/omap_crtc.c
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@@ -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;
unsigned 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 +387,38 @@ 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;
/*
* 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.
*
* Correct solution would be to use DRM's bus-flags, but that's not
* easily possible before the omapdrm's panel/encoder driver model
* has been changed to the DRM model.
*/
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,