linux-kernel - Re: [PATCH v1] drm/edid: add 6 bpc quirk to the Sharp LQ116M1JW10

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Message-ID: <CAD=FV=V6xV0m4pj=7f2dxDP-0A1AaQuYJP5NAnXNz1_bzH7nSw@mail.gmail.com>
Date: Thu, 30 Oct 2025 08:08:20 -0700
From: Doug Anderson <dianders@...omium.org>
To: Ajye Huang <ajye_huang@...pal.corp-partner.google.com>
Cc: linux-kernel@...r.kernel.org, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, dri-devel@...ts.freedesktop.org, 
	Jani Nikula <jani.nikula@...el.com>
Subject: Re: [PATCH v1] drm/edid: add 6 bpc quirk to the Sharp LQ116M1JW10

Hi,

On Thu, Oct 30, 2025 at 2:44 AM Ajye Huang
<ajye_huang@...pal.corp-partner.google.com> wrote:
>
> The Sharp LQ116M1JW105 reports that it supports 8 bpc modes,
> but it will happen display noise in some videos.
> So, limit it to 6 bpc modes.
>
> Signed-off-by: Ajye Huang <ajye_huang@...pal.corp-partner.google.com>
> ---
>  drivers/gpu/drm/drm_edid.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index e2e85345aa9a..a73d37fe7ea1 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -250,6 +250,9 @@ static const struct edid_quirk {
>         EDID_QUIRK('S', 'V', 'R', 0x1019, BIT(EDID_QUIRK_NON_DESKTOP)),
>         EDID_QUIRK('A', 'U', 'O', 0x1111, BIT(EDID_QUIRK_NON_DESKTOP)),
>
> +       /* LQ116M1JW10 displays noise when 8 bpc, but display fine as 6 bpc */
> +       EDID_QUIRK('S', 'H', 'P', 0x154c, EDID_QUIRK_FORCE_6BPC),

Reviewed-by: Douglas Anderson <dianders@...omium.org>

I'll plan to apply this patch next week unless there are any comments.
Given that it's just adding a quirk, I'm also happy to apply it
soonner (or for someone else to apply it) if people think that's OK.
:-)

NOTE: in general if someone is involved in the discussion of a
previous versoin, it's good to CC them on newer versions. I've added
Jani back to the CC list here.

-Doug