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drm/bridge: tc358768: Default to positive h/v syncs

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As the TC358768 is a DPI to DSI bridge, the DSI side does not need to
define h/v sync polarities. This means that sometimes we have a mode
without defined sync polarities, which does not work on the DPI side.

Add a mode_fixup hook to default to positive sync polarities.

Reviewed-by: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Tested-by: Maxim Schwalm <maxim.schwalm@gmail.com> # Asus TF700T
Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230906-tc358768-v4-3-31725f008a50@ideasonboard.com
This commit is contained in:
Tomi Valkeinen 2023-09-06 09:50:50 +03:00 committed by Robert Foss
parent a2d9036615
commit aa23099f47
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GPG key ID: 3EFD900F76D1D784
1 changed files with 18 additions and 0 deletions
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18
drivers/gpu/drm/bridge/tc358768.c
View file

@ -963,9 +963,27 @@ tc358768_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
return input_fmts;
}
static bool tc358768_mode_fixup(struct drm_bridge *bridge,
const struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
/* Default to positive sync */
if (!(adjusted_mode->flags &
(DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NHSYNC)))
adjusted_mode->flags |= DRM_MODE_FLAG_PHSYNC;
if (!(adjusted_mode->flags &
(DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_NVSYNC)))
adjusted_mode->flags |= DRM_MODE_FLAG_PVSYNC;
return true;
}
static const struct drm_bridge_funcs tc358768_bridge_funcs = {
.attach = tc358768_bridge_attach,
.mode_valid = tc358768_bridge_mode_valid,
.mode_fixup = tc358768_mode_fixup,
.pre_enable = tc358768_bridge_pre_enable,
.enable = tc358768_bridge_enable,
.disable = tc358768_bridge_disable,