linux-kernel - Re: [RFC PATCH 3/3] drm: bridge: samsung-dsim: Remove init quirk for Exynos

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Date:   Tue, 18 Apr 2023 15:16:53 +0200
From:   Frieder Schrempf <frieder.schrempf@...tron.de>
To:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Frieder Schrempf <frieder@...s.de>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...il.com>,
        dri-devel@...ts.freedesktop.org, Inki Dae <inki.dae@...sung.com>,
        Jagan Teki <jagan@...rulasolutions.com>,
        linux-kernel@...r.kernel.org,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>
Cc:     Jernej Skrabec <jernej.skrabec@...il.com>,
        Jonas Karlman <jonas@...boo.se>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Marek Vasut <marex@...x.de>
Subject: Re: [RFC PATCH 3/3] drm: bridge: samsung-dsim: Remove init quirk for
 Exynos

On 18.04.23 15:12, Marek Szyprowski wrote:
> On 18.04.2023 12:42, Frieder Schrempf wrote:
>> From: Frieder Schrempf <frieder.schrempf@...tron.de>
>>
>> Assuming that with the init flow fixed to meet the documentation at
>> [1] and the pre_enable_prev_first flag set in downstream bridge/panel
>> drivers which require it, we can use the default flow for Exynos as
>> already done for i.MX8M.
>>
>> [1] https://docs.kernel.org/gpu/drm-kms-helpers.html#mipi-dsi-bridge-operation
>>
>> Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
>> ---
>> I have no idea if my assumptions are correct and if this works at all.
>> There's a very good chance it doesn't...
> 
> Unfortunately this change breaks all Exynos boards with DSI panels. I've 
> check all 4 panels that are in mainline and none worked.

Ok, thanks for testing anyway!

As already mentioned this was rather a shot in the dark, as I didn't
even bother trying to fully understand what's going on on the Exynos side.

For now I will just remove this patch from the series in the next iteration.