[Freedreno] [PATCH v8 4/4] drm/msm/dp: Support the eDP modes given by panel
Sankeerth Billakanti
quic_sbillaka at quicinc.com
Thu Apr 21 14:36:51 UTC 2022
The eDP controller does not have a reliable way keep panel
powered on to read the sink capabilities. So, the controller
driver cannot validate if a mode can be supported by the
source. We will rely on the panel driver to populate only
the supported modes for now.
Signed-off-by: Sankeerth Billakanti <quic_sbillaka at quicinc.com>
Reviewed-by: Douglas Anderson <dianders at chromium.org>
---
Changes in v8:
- add the drm/msm/dp tag in the commit title
drivers/gpu/drm/msm/dp/dp_display.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 86948d6..7d71bdc 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -998,6 +998,14 @@ enum drm_mode_status dp_bridge_mode_valid(struct drm_bridge *bridge,
return -EINVAL;
}
+ /*
+ * The eDP controller currently does not have a reliable way of
+ * enabling panel power to read sink capabilities. So, we rely
+ * on the panel driver to populate only supported modes for now.
+ */
+ if (dp->is_edp)
+ return MODE_OK;
+
if ((dp->max_pclk_khz <= 0) ||
(dp->max_pclk_khz > DP_MAX_PIXEL_CLK_KHZ) ||
(mode->clock > dp->max_pclk_khz))
--
2.7.4
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