linux-kernel - Re: [PATCH v2] drm/bridge: lt9611: Fix handling of 4k panels

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Date:   Thu, 21 Jan 2021 10:50:47 +0100
From:   Robert Foss <robert.foss@...aro.org>
To:     Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        jonas@...boo.se, jernej.skrabec@...l.net,
        dri-devel@...ts.freedesktop.org,
        linux-kernel <linux-kernel@...r.kernel.org>, a.hajda@...sung.com,
        Sam Ravnborg <sam@...nborg.org>
Cc:     John Stultz <john.stultz@...aro.org>,
        Anibal Limon <anibal.limon@...aro.org>,
        Vinod Koul <vkoul@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Peter Collingbourne <pcc@...gle.com>, airlied@...ux.ie,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH v2] drm/bridge: lt9611: Fix handling of 4k panels

Hi,

+Sam Ravnborg

I think this patch is ready to get pulled into the drm-misc tree.

On Thu, 17 Dec 2020 at 15:09, Robert Foss <robert.foss@...aro.org> wrote:
>
> 4k requires two dsi pipes, so don't report MODE_OK when only a
> single pipe is configured. But rather report MODE_PANEL to
> signal that requirements of the panel are not being met.
>
> Reported-by: Peter Collingbourne <pcc@...gle.com>
> Suggested-by: Peter Collingbourne <pcc@...gle.com>
> Signed-off-by: Robert Foss <robert.foss@...aro.org>
> Tested-by: John Stultz <john.stultz@...aro.org>
> Tested-by: Anibal Limon <anibal.limon@...aro.org>
> Acked-By: Vinod Koul <vkoul@...nel.org>
> Tested-by: Peter Collingbourne <pcc@...gle.com>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>  drivers/gpu/drm/bridge/lontium-lt9611.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c
> index d734d9402c35..e8eb8deb444b 100644
> --- a/drivers/gpu/drm/bridge/lontium-lt9611.c
> +++ b/drivers/gpu/drm/bridge/lontium-lt9611.c
> @@ -867,8 +867,14 @@ static enum drm_mode_status lt9611_bridge_mode_valid(struct drm_bridge *bridge,
>                                                      const struct drm_display_mode *mode)
>  {
>         struct lt9611_mode *lt9611_mode = lt9611_find_mode(mode);
> +       struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
>
> -       return lt9611_mode ? MODE_OK : MODE_BAD;
> +       if (!lt9611_mode)
> +               return MODE_BAD;
> +       else if (lt9611_mode->intfs > 1 && !lt9611->dsi1)
> +               return MODE_PANEL;
> +       else
> +               return MODE_OK;
>  }
>
>  static void lt9611_bridge_pre_enable(struct drm_bridge *bridge)
> --
> 2.27.0
>