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Date: Tue, 22 Feb 2022 05:30:30 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Vinod Polimera <quic_vpolimer@...cinc.com>
Cc: dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, agross@...nel.org,
bjorn.andersson@...aro.org, robh+dt@...nel.org,
robdclark@...il.com, seanpaul@...omium.org, swboyd@...omium.org,
dianders@...omium.org, krzysztof.kozlowski@...onical.com,
thierry.reding@...il.com, sam@...nborg.org, airlied@...ux.ie,
daniel@...ll.ch, quic_kalyant@...cinc.com,
quic_sbillaka@...cinc.com, quic_vproddut@...cinc.com
Subject: Re: [PATCH v2 2/4] drm/bridge: use atomic enable/disable for bridge callbacks
On Mon, 21 Feb 2022 at 17:52, Vinod Polimera <quic_vpolimer@...cinc.com> wrote:
>
> Use atomic enable/disable for bridge callbacks to access certain
> states like self-refresh.
>
> This change avoids panel prepare/unprepare based on self-refresh
> state.
Please split this into two patches:
- change to atomic_* callbacks
- introduction of PSR support.
>
> Signed-off-by: Sankeerth Billakanti <quic_sbillaka@...cinc.com>
> Signed-off-by: Kalyan Thota <quic_kalyant@...cinc.com>
> Signed-off-by: Vinod Polimera <quic_vpolimer@...cinc.com>
>
> Changes in V2:
> - As per review suggestion by Dmitry.
> ---
> drivers/gpu/drm/bridge/panel.c | 102 +++++++++++++++++++++++++++++++++++++----
> 1 file changed, 94 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
> index b32295a..5c7dc82 100644
> --- a/drivers/gpu/drm/bridge/panel.c
> +++ b/drivers/gpu/drm/bridge/panel.c
> @@ -41,6 +41,40 @@ static int panel_bridge_connector_get_modes(struct drm_connector *connector)
> return drm_panel_get_modes(panel_bridge->panel, connector);
> }
>
> +static struct drm_crtc *bridge_drm_get_old_connector_crtc(struct drm_encoder *encoder,
> + struct drm_atomic_state *state)
> +{
> + struct drm_connector *connector;
> + struct drm_connector_state *conn_state;
> +
> + connector = drm_atomic_get_old_connector_for_encoder(state, encoder);
> + if (!connector)
> + return NULL;
> +
> + conn_state = drm_atomic_get_old_connector_state(state, connector);
> + if (!conn_state)
> + return NULL;
> +
> + return conn_state->crtc;
> +}
> +
> +static struct drm_crtc *bridge_drm_get_new_connector_crtc(struct drm_encoder *encoder,
> + struct drm_atomic_state *state)
> +{
> + struct drm_connector *connector;
> + struct drm_connector_state *conn_state;
> +
> + connector = drm_atomic_get_new_connector_for_encoder(state, encoder);
> + if (!connector)
> + return NULL;
> +
> + conn_state = drm_atomic_get_new_connector_state(state, connector);
> + if (!conn_state)
> + return NULL;
> +
> + return conn_state->crtc;
> +}
> +
> static const struct drm_connector_helper_funcs
> panel_bridge_connector_helper_funcs = {
> .get_modes = panel_bridge_connector_get_modes,
> @@ -102,30 +136,82 @@ static void panel_bridge_detach(struct drm_bridge *bridge)
> drm_connector_cleanup(connector);
> }
>
> -static void panel_bridge_pre_enable(struct drm_bridge *bridge)
> +static void panel_bridge_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 *old_state = old_bridge_state->base.state;
> + struct drm_encoder *encoder = bridge->encoder;
> + struct drm_crtc *crtc;
> + struct drm_crtc_state *old_crtc_state;
> +
> + crtc = bridge_drm_get_new_connector_crtc(encoder, old_state);
> + if (!crtc)
> + return;
> +
> + old_crtc_state = drm_atomic_get_old_crtc_state(old_state, crtc);
> + if (old_crtc_state && old_crtc_state->self_refresh_active)
> + return;
>
> drm_panel_prepare(panel_bridge->panel);
> }
>
> -static void panel_bridge_enable(struct drm_bridge *bridge)
> +static void panel_bridge_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 *old_state = old_bridge_state->base.state;
> + struct drm_encoder *encoder = bridge->encoder;
> + struct drm_crtc *crtc;
> + struct drm_crtc_state *old_crtc_state;
> +
> + crtc = bridge_drm_get_new_connector_crtc(encoder, old_state);
> + if (!crtc)
> + return;
> +
> + old_crtc_state = drm_atomic_get_old_crtc_state(old_state, crtc);
> + if (old_crtc_state && old_crtc_state->self_refresh_active)
> + return;
>
> drm_panel_enable(panel_bridge->panel);
> }
>
> -static void panel_bridge_disable(struct drm_bridge *bridge)
> +static void panel_bridge_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 *old_state = old_bridge_state->base.state;
> + struct drm_encoder *encoder = bridge->encoder;
> + struct drm_crtc *crtc;
> + struct drm_crtc_state *new_crtc_state;
> +
> + crtc = bridge_drm_get_old_connector_crtc(encoder, old_state);
> + if (!crtc)
> + return;
> +
> + new_crtc_state = drm_atomic_get_new_crtc_state(old_state, crtc);
> + if (new_crtc_state && new_crtc_state->self_refresh_active)
> + return;
>
> drm_panel_disable(panel_bridge->panel);
> }
>
> -static void panel_bridge_post_disable(struct drm_bridge *bridge)
> +static void panel_bridge_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 *old_state = old_bridge_state->base.state;
> + struct drm_encoder *encoder = bridge->encoder;
> + struct drm_crtc *crtc;
> + struct drm_crtc_state *new_crtc_state;
> +
> + crtc = bridge_drm_get_old_connector_crtc(encoder, old_state);
> + if (!crtc)
> + return;
> +
> + new_crtc_state = drm_atomic_get_new_crtc_state(old_state, crtc);
> + if (new_crtc_state && new_crtc_state->self_refresh_active)
> + return;
>
> drm_panel_unprepare(panel_bridge->panel);
> }
> @@ -141,10 +227,10 @@ static int panel_bridge_get_modes(struct drm_bridge *bridge,
> static const struct drm_bridge_funcs panel_bridge_bridge_funcs = {
> .attach = panel_bridge_attach,
> .detach = panel_bridge_detach,
> - .pre_enable = panel_bridge_pre_enable,
> - .enable = panel_bridge_enable,
> - .disable = panel_bridge_disable,
> - .post_disable = panel_bridge_post_disable,
> + .atomic_pre_enable = panel_bridge_pre_enable,
> + .atomic_enable = panel_bridge_enable,
> + .atomic_disable = panel_bridge_disable,
> + .atomic_post_disable = panel_bridge_post_disable,
Please change callback names to reflect that we are using atomic_ interfaces.
> .get_modes = panel_bridge_get_modes,
> .atomic_reset = drm_atomic_helper_bridge_reset,
> .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> --
> 2.7.4
>
--
With best wishes
Dmitry
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