linux-kernel - Re: [PATCH 0/2] Add quirk to disable PSR 2 on Tongfang PHxTxX1 and PHxTQx1

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Date:   Thu, 23 Feb 2023 20:02:56 +0100
From:   Werner Sembach <wse@...edocomputers.com>
To:     "Hogander, Jouni" <jouni.hogander@...el.com>,
        "Souza, Jose" <jose.souza@...el.com>,
        "Santa Cruz, Diego" <Diego.SantaCruz@...netix.com>,
        "Vivi, Rodrigo" <rodrigo.vivi@...el.com>,
        "ville.syrjala@...ux.intel.com" <ville.syrjala@...ux.intel.com>,
        "joonas.lahtinen@...ux.intel.com" <joonas.lahtinen@...ux.intel.com>,
        "Kahola, Mika" <mika.kahola@...el.com>,
        "airlied@...il.com" <airlied@...il.com>,
        "tvrtko.ursulin@...ux.intel.com" <tvrtko.ursulin@...ux.intel.com>,
        "intel-gfx@...ts.freedesktop.org" <intel-gfx@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "jani.nikula@...ux.intel.com" <jani.nikula@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "De Marchi, Lucas" <lucas.demarchi@...el.com>
Subject: Re: [PATCH 0/2] Add quirk to disable PSR 2 on Tongfang PHxTxX1 and
 PHxTQx1


Am 23.02.23 um 19:56 schrieb Werner Sembach:
>
> Am 23.02.23 um 19:26 schrieb Hogander, Jouni:
>> On Wed, 2023-02-22 at 15:17 +0100, Werner Sembach wrote:
>>> On these Barebones PSR 2 is recognized as supported but is very
>>> buggy:
>>> - Upper third of screen does sometimes not updated, resulting in
>>> disappearing cursors or ghosts of already closed Windows saying
>>> behind.
>>> - Approximately 40 px from the bottom edge a 3 pixel wide strip of
>>> randomly
>>> colored pixels is flickering.
>>>
>>> PSR 1 is working fine however.
>>>
>>> This patchset introduces a new quirk to disable PSR 2 specifically on
>>> known
>>> buggy devices and applies it to the Tongfang PHxTxX1 and PHxTQx1
>>> barebones.
>> I've been thinking something similar as there is still at least one
>> issue which seems to be like panel side issue:
>>
>> https://gitlab.freedesktop.org/drm/intel/-/issues/7836
>>
>> Did you considered dpcd_quirk_list in drivers/gpu/drm/drm_dp_helper.c?
>>
>> I'm not sure which one is more correct though...
> Imho, since the proper fix lies within the Intel driver the quirk should also 
> lie within the Intel driver, because even if the panel has the same problem 
> combined with an AMD or NVIDIA card the proper fix for them will most likely 
> be land in the same kernel version. So there could be a period where you no 
> longer want the quirk for devices combining the panel with an Intel gpu but 
> still with an AMD GPU or vice versa.
*the proper fix for them will most likely not be in the same kernel version.
>>
>>> Signed-off-by: Werner Sembach <wse@...edocomputers.com>
>>> Cc: <stable@...r.kernel.org>
>>>
>>>