linux-kernel - Re: [PATCH v9 08/15] drm/bridge: add psr support for panel bridge callbacks

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Message-ID: <Y7bMcLHr79uhfJv2@phenom.ffwll.local>
Date:   Thu, 5 Jan 2023 14:11:12 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Vinod Polimera <quic_vpolimer@...cinc.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        quic_kalyant@...cinc.com, quic_sbillaka@...cinc.com,
        quic_bjorande@...cinc.com, quic_abhinavk@...cinc.com,
        quic_vproddut@...cinc.com, quic_khsieh@...cinc.com,
        dianders@...omium.org, linux-kernel@...r.kernel.org,
        dmitry.baryshkov@...aro.org, quic_aravindh@...cinc.com,
        swboyd@...omium.org
Subject: Re: [PATCH v9 08/15] drm/bridge: add psr support for panel bridge
 callbacks

On Wed, Dec 14, 2022 at 03:35:45PM +0530, Vinod Polimera wrote:
> This change will handle the psr entry exit cases in the panel
> bridge atomic callback functions. For example, the panel power
> should not turn off if the panel is entering psr.
> 
> Signed-off-by: Sankeerth Billakanti <quic_sbillaka@...cinc.com>
> Signed-off-by: Vinod Polimera <quic_vpolimer@...cinc.com>

I think this is all a nice integration of the sr helpers and bridge stuff
and makes sense to me. For the 2 bridge patches and the drm core atomic
patch:

Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>

> ---
>  drivers/gpu/drm/bridge/panel.c | 48 ++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 48 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
> index 3558cbf..5e77e38 100644
> --- a/drivers/gpu/drm/bridge/panel.c
> +++ b/drivers/gpu/drm/bridge/panel.c
> @@ -113,6 +113,18 @@ static void panel_bridge_atomic_pre_enable(struct drm_bridge *bridge,
>  				struct drm_bridge_state *old_bridge_state)
>  {
>  	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
> +	struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
> +	struct drm_encoder *encoder = bridge->encoder;
> +	struct drm_crtc *crtc;
> +	struct drm_crtc_state *old_crtc_state;
> +
> +	crtc = drm_atomic_get_new_crtc_for_encoder(atomic_state, encoder);
> +	if (!crtc)
> +		return;
> +
> +	old_crtc_state = drm_atomic_get_old_crtc_state(atomic_state, crtc);
> +	if (old_crtc_state && old_crtc_state->self_refresh_active)
> +		return;
>  
>  	drm_panel_prepare(panel_bridge->panel);
>  }
> @@ -121,6 +133,18 @@ static void panel_bridge_atomic_enable(struct drm_bridge *bridge,
>  				struct drm_bridge_state *old_bridge_state)
>  {
>  	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
> +	struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
> +	struct drm_encoder *encoder = bridge->encoder;
> +	struct drm_crtc *crtc;
> +	struct drm_crtc_state *old_crtc_state;
> +
> +	crtc = drm_atomic_get_new_crtc_for_encoder(atomic_state, encoder);
> +	if (!crtc)
> +		return;
> +
> +	old_crtc_state = drm_atomic_get_old_crtc_state(atomic_state, crtc);
> +	if (old_crtc_state && old_crtc_state->self_refresh_active)
> +		return;
>  
>  	drm_panel_enable(panel_bridge->panel);
>  }
> @@ -129,6 +153,18 @@ static void panel_bridge_atomic_disable(struct drm_bridge *bridge,
>  				struct drm_bridge_state *old_bridge_state)
>  {
>  	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
> +	struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
> +	struct drm_encoder *encoder = bridge->encoder;
> +	struct drm_crtc *crtc;
> +	struct drm_crtc_state *new_crtc_state;
> +
> +	crtc = drm_atomic_get_old_crtc_for_encoder(atomic_state, encoder);
> +	if (!crtc)
> +		return;
> +
> +	new_crtc_state = drm_atomic_get_new_crtc_state(atomic_state, crtc);
> +	if (new_crtc_state && new_crtc_state->self_refresh_active)
> +		return;
>  
>  	drm_panel_disable(panel_bridge->panel);
>  }
> @@ -137,6 +173,18 @@ static void panel_bridge_atomic_post_disable(struct drm_bridge *bridge,
>  				struct drm_bridge_state *old_bridge_state)
>  {
>  	struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
> +	struct drm_atomic_state *atomic_state = old_bridge_state->base.state;
> +	struct drm_encoder *encoder = bridge->encoder;
> +	struct drm_crtc *crtc;
> +	struct drm_crtc_state *new_crtc_state;
> +
> +	crtc = drm_atomic_get_old_crtc_for_encoder(atomic_state, encoder);
> +	if (!crtc)
> +		return;
> +
> +	new_crtc_state = drm_atomic_get_new_crtc_state(atomic_state, crtc);
> +	if (new_crtc_state && new_crtc_state->self_refresh_active)
> +		return;
>  
>  	drm_panel_unprepare(panel_bridge->panel);
>  }
> -- 
> 2.7.4
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch