From: Maxime Ripard <mripard@kernel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
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>,
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Krzysztof Kozlowski <krzk+dt@kernel.org>,
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Romain TISSERAND <romain.tisserand@gmail.com>
Subject: Re: [PATCH] dt-bindings: display: panel: Make DSI panels port optional
Date: Wed, 11 Nov 2026 14:52:44 +0100 [thread overview]
Message-ID: <avRy_D6MTK5u01_9@houat> (raw)
In-Reply-To: <0f2c0eae-ed05-41a2-8688-e4b6fe1b7ff3@oss.qualcomm.com>
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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.
Maxime
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next prev parent reply other threads:[~2026-11-11 13:52 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 [this message]
2026-11-11 13:54 ` Krzysztof Kozlowski
2026-11-11 11:18 ` Svyatoslav Ryhel
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