Re: [PATCH v4 24/24] drm/exynos: dsi: Adjust probe order

[Marek Szyprowski]

Hi Maxime,

On 22.09.2021 10:53, Maxime Ripard wrote:
> On Fri, Sep 17, 2021 at 02:35:05PM +0200, Marek Szyprowski wrote:
>> On 13.09.2021 12:30, Andrzej Hajda wrote:
>>> W dniu 10.09.2021 o 12:12, Maxime Ripard pisze:
>>>> Without proper care and an agreement between how DSI hosts and devices
>>>> drivers register their MIPI-DSI entities and potential components, we can
>>>> end up in a situation where the drivers can never probe.
>>>>
>>>> Most drivers were taking evasive maneuvers to try to workaround this,
>>>> but not all of them were following the same conventions, resulting in
>>>> various incompatibilities between DSI hosts and devices.
>>>>
>>>> Now that we have a sequence agreed upon and documented, let's convert
>>>> exynos to it.
>>>>
>>>> Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>
>>> This patch should be dropped, as it will probably break the driver.
>>>
>>> Exynos is already compatible with the pattern
>>> register-bus-then-get-sink, but it adds/removes panel/bridge
>>> dynamically, so it creates drm_device without waiting for downstream sink.
>> Right, this patch breaks Exynos DSI driver operation. Without it, the
>> whole series works fine on all Exynos based test boards.
> Thanks for testing. Did you have any board using one of those bridges in
> your test sample?

Nope, the only bridges I've tested are tc358764 and exynos-mic. However, 
both are used in a bit special way. The rest of my test boards just have 
a dsi panel.

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland