[PATCH 21/41] drm/bridge: analogix_dp: Ensure edp is disabled when shutting down the panel

[Andrzej Hajda]

On 10.03.2017 05:32, Sean Paul wrote:
> From: Lin Huang <hl at rock-chips.com>
>
> When panel is shut down, we should make sure edp can be disabled to avoid
> undefined behavior.
>
> Cc: Stéphane Marchesin <marcheu at chromium.org>
> Signed-off-by: Lin Huang <hl at rock-chips.com>
> Signed-off-by: zain wang <wzz at rock-chips.com>
> Signed-off-by: Sean Paul <seanpaul at chromium.org>

Beside nitpicks:
Reviewed-by: Andrzej Hajda <a.hajda at samsung.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 048b6f7c9b6e..3b2d53935ae9 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
> @@ -1163,6 +1163,12 @@ 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);

Again inconsistent loggging method and ret reporting :)

> +		goto out_dp_clk_pre;
> +	}
> +
>  	if (dp->plat_data->power_on)
>  		dp->plat_data->power_on(dp->plat_data);
>  
> @@ -1192,6 +1198,8 @@ 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;
> @@ -1235,10 +1243,13 @@ 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);

The last argument is of bool type, so preferably it should be true, but
no big deal.
BTW what is the meaning of the last argument of
analogix_dp_set_analog_power_down?

Regards
Andrzej

>  
>  	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);