linux-kernel - Re: [PATCH v3 2/3] drm/bridge: ti-sn65dsi86: Implement bridge connector operations

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Message-ID: <CAD=FV=UcfrWLQdCOx5dCfjvjrLzkdLDeoAROmMtqFWB_X90rwQ@mail.gmail.com>
Date:   Thu, 10 Mar 2022 15:10:20 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Sam Ravnborg <sam@...nborg.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Subject: Re: [PATCH v3 2/3] drm/bridge: ti-sn65dsi86: Implement bridge
 connector operations

Hi,

On Thu, Mar 10, 2022 at 7:22 AM Kieran Bingham
<kieran.bingham+renesas@...asonboard.com> wrote:
>
> From: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
>
> Implement the bridge connector-related .get_edid() operation, and report
> the related bridge capabilities and type.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> ---
> Changes since v1:
>
> - The connector .get_modes() operation doesn't rely on EDID anymore,
>   __ti_sn_bridge_get_edid() and ti_sn_bridge_get_edid() got merged
>   together
>  - Fix on top of Sam Ravnborg's DRM_BRIDGE_STATE_OPS
>
> Changes since v2: [Kieran]
>  - Only support EDID on DRM_MODE_CONNECTOR_DisplayPort modes.
>
>  drivers/gpu/drm/bridge/ti-sn65dsi86.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
>
> diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> index 93b54fcba8ba..d581c820e5d8 100644
> --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> @@ -1135,10 +1135,24 @@ static void ti_sn_bridge_atomic_post_disable(struct drm_bridge *bridge,
>         pm_runtime_put_sync(pdata->dev);
>  }
>
> +static struct edid *ti_sn_bridge_get_edid(struct drm_bridge *bridge,
> +                                         struct drm_connector *connector)
> +{
> +       struct ti_sn65dsi86 *pdata = bridge_to_ti_sn65dsi86(bridge);
> +       struct edid *edid;
> +
> +       pm_runtime_get_sync(pdata->dev);
> +       edid = drm_get_edid(connector, &pdata->aux.ddc);
> +       pm_runtime_put_autosuspend(pdata->dev);

I'm 99% sure that the pm_runtime calls here are not needed and can be
removed.. The AUX transfer function handles the pm_runtime_get_sync()
and it also does the "put" with autosuspend so that the whole EDID can
be read without constantly powering the bridge up and down again.