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

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Message-ID: <7071a2b8198c09011c84d39b45dc6d1da4b69d12@intel.com>
Date: Fri, 31 Oct 2025 12:37:52 +0200
From: Jani Nikula <jani.nikula@...el.com>
To: Doug Anderson <dianders@...omium.org>, 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
Subject: Re: [PATCH v1] drm/edid: add 6 bpc quirk to the Sharp LQ116M1JW10

On Thu, 30 Oct 2025, Doug Anderson <dianders@...omium.org> wrote:
> 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>

FWIW,

Acked-by: Jani Nikula <jani.nikula@...el.com>

>
> 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

-- 
Jani Nikula, Intel