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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <789d88744fbd3a05758971dc8d893fb4599475f3@intel.com>
Date: Fri, 31 Oct 2025 12:40:07 +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 Fri, 31 Oct 2025, Jani Nikula <jani.nikula@...el.com> wrote:
> 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>

And as soon as I hit send, I notice the quirk is missing BIT(). It's a
bit mask, and the enum signifies the bit number.

BR,
Jani.

>
>>
>> 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