[PATCH v2 1/2] drm/bridge: anx7625: Drop EDID cache on bridge power off

[Pin-yen Lin]

The bridge might miss the display change events when it's powered off.
This happens when a user changes the external monitor when the system
is suspended and the embedded controller doesn't not wake AP up.

It's also observed that one DP-to-HDMI bridge doesn't work correctly
when there is no EDID read after it is powered on.

Drop the cache to force an EDID read after system resume to fix this.

Fixes: 8bdfc5dae4e3 ("drm/bridge: anx7625: Add anx7625 MIPI DSI/DPI to DP")
Signed-off-by: Pin-yen Lin <treapking at chromium.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>

---

Changes in v2:
- Only drop the EDID cache for anx7625 when it's not in eDP mode
- Collect review tag

 drivers/gpu/drm/bridge/analogix/anx7625.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 88e4aa5830f3..5c6bd7be25c0 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -2561,6 +2561,8 @@ static int __maybe_unused anx7625_runtime_pm_suspend(struct device *dev)
 	mutex_lock(&ctx->lock);
 
 	anx7625_stop_dp_work(ctx);
+	if (!ctx->pdata.panel_bridge)
+		anx7625_remove_edid(ctx);
 	anx7625_power_standby(ctx);
 
 	mutex_unlock(&ctx->lock);
-- 
2.46.0.792.g87dc391469-goog