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 18:26:11 +0000
From:   "Hogander, Jouni" <jouni.hogander@...el.com>
To:     "Souza, Jose" <jose.souza@...el.com>,
        "Santa Cruz, Diego" <Diego.SantaCruz@...netix.com>,
        "wse@...edocomputers.com" <wse@...edocomputers.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

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...

> 
> Signed-off-by: Werner Sembach <wse@...edocomputers.com>
> Cc: <stable@...r.kernel.org>
> 
>