From: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
To: Maxime Ripard <mripard@kernel.org>
Cc: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>,
Neil Armstrong <neil.armstrong@linaro.org>,
Jessica Zhang <jesszhan0024@gmail.com>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@gmail.com>, Simona Vetter <simona@ffwll.ch>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Joel Selvaraj <jo@jsfamily.in>,
Jagan Teki <jagan@amarulasolutions.com>,
Ondrej Jirman <megi@xff.cz>,
Javier Martinez Canillas <javierm@redhat.com>,
Michael Trimarchi <michael@amarulasolutions.com>,
Michael Tretter <m.tretter@pengutronix.de>,
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linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
Romain TISSERAND <romain.tisserand@gmail.com>
Subject: Re: [PATCH] dt-bindings: display: panel: Make DSI panels port optional
Date: Wed, 11 Nov 2026 14:54:54 +0100 [thread overview]
Message-ID: <8a557bae-42ae-42bd-a149-cf854b7af9d5@oss.qualcomm.com> (raw)
In-Reply-To: <avRy_D6MTK5u01_9@houat>
On 11/11/2026 14:52, Maxime Ripard wrote:
> On Wed, Nov 11, 2026 at 01:44:23PM +0100, Krzysztof Kozlowski wrote:
>> On 11/11/2026 13:37, Dmitry Baryshkov wrote:
>>> On Wed, Nov 11, 2026 at 01:31:39PM +0100, Krzysztof Kozlowski wrote:
>>>> On 11/11/2026 13:30, Krzysztof Kozlowski wrote:
>>>>> On 11/11/2026 12:13, Maxime Ripard wrote:
>>>>>> On Wed, Nov 11, 2026 at 12:03:39PM +0100, Krzysztof Kozlowski wrote:
>>>>>>> DSI panels can be placed under DSI bus directly and many Linux DRM
>>>>>>> drivers will work fine with it: mipi_dsi_host_register() adds device for
>>>>>>> such panel and DRM driver does not use OF graph to configure lanes.
>>>>>>
>>>>>> That's not true. We do use the endpoints to configure the lanes through
>>>>>> the data-lanes property. See drm_of_get_data_lanes*
>>>>>
>>>>> Some drivers use endpoints, some not. As discussed on other thread,
>>>>> there are more than which do not.
>>>>
>>>> "there are more than one which do not."
>>>
>>> Which means that those should be fixed. We have legacy cases where the
>>> drivers assumed that, but we should not target legacy.
>>
>> These legacy drivers work fine for 10 or 15 years, like Exynos.
>>
>> You can improve them, for sure, but if no one does that then requiring a
>> graph is a mistake there, from the panel point of view.
>
> At the very least the commit log needs some work then, because the
> situation you describe in it is simply wrong, and quite different to the
> situation you then described.
Commit msg said:
"many Linux DRM drivers will work fine with it"
So many->some? Is this the only problem? What else is not described in
commit msg?
Best regards,
Krzysztof
next prev parent reply other threads:[~2026-11-11 13:55 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-11 11:03 Krzysztof Kozlowski
2026-11-11 11:13 ` Maxime Ripard
2026-11-11 12:30 ` Krzysztof Kozlowski
2026-11-11 12:31 ` Krzysztof Kozlowski
2026-11-11 12:37 ` Dmitry Baryshkov
2026-11-11 12:44 ` Krzysztof Kozlowski
2026-11-11 13:52 ` Maxime Ripard
2026-11-11 13:54 ` Krzysztof Kozlowski [this message]
2026-11-11 11:18 ` Svyatoslav Ryhel
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