linux-kernel - Re: [PATCH v1] drm/bridge: lt9611: Fix handling of 4k panels

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Message-ID: <CAMn1gO6AQvyJO0s2k1POAVn4JxuOKLoKpj_UvvW3TnLTtv6_bw@mail.gmail.com>
Date:   Thu, 10 Dec 2020 13:00:13 -0800
From:   Peter Collingbourne <pcc@...gle.com>
To:     Robert Foss <robert.foss@...aro.org>
Cc:     a.hajda@...sung.com, Neil Armstrong <narmstrong@...libre.com>,
        Laurent.pinchart@...asonboard.com, jonas@...boo.se,
        jernej.skrabec@...l.net, airlied@...ux.ie,
        Daniel Vetter <daniel@...ll.ch>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        John Stultz <john.stultz@...aro.org>,
        Alistair Delva <adelva@...gle.com>,
        Vinod Koul <vinod.koul@...aro.org>,
        Anibal Limon <anibal.limon@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH v1] drm/bridge: lt9611: Fix handling of 4k panels

Thanks. Confirmed that this fixes display output for me on a 4K monitor.

On Mon, Nov 23, 2020 at 2:46 AM 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: Peter Collingbourne <pcc@...gle.com>

> ---
>  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
>