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

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Date:   Thu, 10 Mar 2022 18:23:27 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        Sam Ravnborg <sam@...nborg.org>,
        Douglas Anderson <dianders@...omium.org>,
        linux-kernel@...r.kernel.org,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH v3 2/3] drm/bridge: ti-sn65dsi86: Implement bridge
 connector operations

Hi Kieran,

Thank you for the patch.

On Thu, Mar 10, 2022 at 03:22:26PM +0000, Kieran Bingham 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);
> +
> +	return edid;
> +}
> +
>  static const struct drm_bridge_funcs ti_sn_bridge_funcs = {
>  	.attach = ti_sn_bridge_attach,
>  	.detach = ti_sn_bridge_detach,
>  	.mode_valid = ti_sn_bridge_mode_valid,
> +	.get_edid = ti_sn_bridge_get_edid,
>  	.atomic_pre_enable = ti_sn_bridge_atomic_pre_enable,
>  	.atomic_enable = ti_sn_bridge_atomic_enable,
>  	.atomic_disable = ti_sn_bridge_atomic_disable,
> @@ -1233,6 +1247,9 @@ static int ti_sn_bridge_probe(struct auxiliary_device *adev,
>  	pdata->bridge.type = pdata->next_bridge->type == DRM_MODE_CONNECTOR_DisplayPort
>  			   ? DRM_MODE_CONNECTOR_DisplayPort : DRM_MODE_CONNECTOR_eDP;
>  
> +	if (pdata->bridge.type == DRM_MODE_CONNECTOR_DisplayPort)
> +		pdata->bridge.ops = DRM_BRIDGE_OP_EDID;

You could write this as

	if (pdata->bridge.type == DRM_MODE_CONNECTOR_DisplayPort)
		pdata->bridge.ops |= DRM_BRIDGE_OP_EDID;

to be ready to support other ops, but that doesn't help
DRM_BRIDGE_OP_DETECT in 3/3, and I don't foresee the need for other ops.

In any case,

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> +
>  	drm_bridge_add(&pdata->bridge);
>  
>  	ret = ti_sn_attach_host(pdata);

-- 
Regards,

Laurent Pinchart