Hi Marek,

On 06/03/18 08:35, Marek Szyprowski wrote:

Hi All,

This is the patch, which introduces the issue I've pointed here:

https://lists.freedesktop.org/archives/dri-devel/2018-March/167794.html

On 2018-03-05 23:23, Enric Balletbo i Serra wrote:

...

From: Lin Huang hl@rock-chips.com

When panel is shut down, we should make sure edp can be disabled to avoid undefined behavior.

Cc: Stéphane Marchesin marcheu@chromium.org Signed-off-by: Lin Huang hl@rock-chips.com Signed-off-by: zain wang wzz@rock-chips.com Signed-off-by: Sean Paul seanpaul@chromium.org Signed-off-by: Thierry Escande thierry.escande@collabora.com Reviewed-by: Andrzej Hajda a.hajda@samsung.com Signed-off-by: Enric Balletbo i Serra enric.balletbo@collabora.com

---

drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 11 +++++++++++   1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c index 92fb9a072cb6..9b7d530ad24c 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c @@ -1160,6 +1160,12 @@ static int analogix_dp_set_bridge(struct analogix_dp_device *dp)         pm_runtime_get_sync(dp->dev);   +    ret = clk_prepare_enable(dp->clock); +    if (ret < 0) { +        DRM_ERROR("Failed to prepare_enable the clock clk [%d]\n", ret); +        goto out_dp_clk_pre; +    }

if (dp->plat_data->power_on)           dp->plat_data->power_on(dp->plat_data);   @@ -1191,6 +1197,8 @@ static int analogix_dp_set_bridge(struct analogix_dp_device *dp)       phy_power_off(dp->phy);       if (dp->plat_data->power_off)           dp->plat_data->power_off(dp->plat_data); +    clk_disable_unprepare(dp->clock); +out_dp_clk_pre:       pm_runtime_put_sync(dp->dev);         return ret; @@ -1234,10 +1242,13 @@ static void analogix_dp_bridge_disable(struct drm_bridge *bridge)         disable_irq(dp->irq);       phy_power_off(dp->phy); +    analogix_dp_set_analog_power_down(dp, POWER_ALL, 1);

In case of Exynos DP, external PHY is used to power the DP block, so no register access should be performed after phy_power_off(). Please move analogix_dp_set_analog_power_down() before phy_power_off().

Oh, sorry, I missed that change, I'll include in next version, but I will wait a little bit more before send for if I receive feedback on the others patches.

...

if (dp->plat_data->power_off)           dp->plat_data->power_off(dp->plat_data);   +    clk_disable_unprepare(dp->clock);

pm_runtime_put_sync(dp->dev);         ret = analogix_dp_prepare_panel(dp, false, true);

Best regards

Enric