linux-kernel - Re: [PATCH 00/20] drm/panel: Move to using mipi_dsi_*

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Message-ID: <20250218-primitive-kickass-seagull-008bf2@houat>
Date: Tue, 18 Feb 2025 16:52:53 +0100
From: Maxime Ripard <mripard@...nel.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Doug Anderson <dianders@...omium.org>, 
	Anusha Srivatsa <asrivats@...hat.com>, Neil Armstrong <neil.armstrong@...aro.org>, 
	Jessica Zhang <quic_jesszhan@...cinc.com>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, Joel Selvaraj <jo@...amily.in>, Ondrej Jirman <megi@....cz>, 
	Javier Martinez Canillas <javierm@...hat.com>, Jianhua Lu <lujianhua000@...il.com>, 
	Robert Chiras <robert.chiras@....com>, Artur Weber <aweber.kernel@...il.com>, 
	Jonathan Corbet <corbet@....net>, dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
	linux-doc@...r.kernel.org, Tejas Vipin <tejasvipin76@...il.com>
Subject: Re: [PATCH 00/20] drm/panel: Move to using mipi_dsi_*_multi()
 variants when available

On Tue, Feb 18, 2025 at 02:14:43PM +0200, Dmitry Baryshkov wrote:
> On Tue, Feb 18, 2025 at 10:55:49AM +0100, Maxime Ripard wrote:
> > On Fri, Feb 14, 2025 at 08:26:02AM -0800, Doug Anderson wrote:
> > > Hi,
> > > 
> > > On Thu, Feb 13, 2025 at 12:44 PM Anusha Srivatsa <asrivats@...hat.com> wrote:
> > > >
> > > > A lot of mipi API are deprecated and have a _multi() variant
> > > > which is the preferred way forward. This covers  TODO in the
> > > > gpu Documentation:[1]
> > > >
> > > > An incomplete effort was made in the previous version
> > > > to address this[2]. It removed on the mipi_dsi_dcs_write_seq()
> > > > and mipi_dsi_generic_write_seq_multi() with the respective
> > > > replacemts and not the rest of the API.
> > > 
> > > You didn't seem to take most of the suggestions I gave in response to
> > > your v1 [3]. Specifically:
> > > 
> > > a) I asked that you CC Tejas. I've added him again.
> > > 
> > > b) I asked that you CC me on the whole patch series, which you didn't
> > > do. I can find them, but I'd find it convenient in this case for them
> > > to be in my Inbox.
> > > 
> > > The first patch conflicts with what Tejas already landed in
> > > drm-misc-next. See commit 8025f23728e9 ("drm/panel:
> > > xinpeng-xpp055c272: transition to mipi_dsi wrapped functions"). The
> > > second patch _also_ conflicts with what Tejas already landed. See
> > > commit f4dd4cb79f9e ("drm/panel: visionox-r66451: transition to
> > > mipi_dsi wrapped functions"). Later patches also also conflict. See
> > > commit 0d6c9edf9e5b ("drm/panel: ebbg-ft8719: transition to mipi_dsi
> > > wrapped functions"), commit ce8c69ec90ca ("drm/panel:
> > > samsung-s6e88a0-ams452ef01: transition to mipi_dsi wrapped
> > > functions"), and commit 7e3bf00047cd ("drm/panel: sharp-ls060t1sx01:
> > > transition to mipi_dsi wrapped functions"). Maybe you should sync up
> > > with drm-misc-next before submitting.
> > 
> > Yes, you should definitely work from drm-misc-next there, and sync with
> > Tejas.
> > 
> > > I also questioned whether this really made sense to try to do with a
> > > Coccinelle script and I still don't think so. It looks like Dmitry has
> > > already reviewed the first few of your patches and has repeated my
> > > advice. If you want to help with the effort of addressing this TODO
> > > item then that's great, but I'll stop reviewing (and start silently
> > > deleting) any future submissions of yours that say that they're done
> > > entirely with a Coccinelle script unless you address this point and
> > > convince me that your Coccinelle script is really smart enough to
> > > handle all the corner cases. I'll also assert that you should review
> > > Tejas's submissions to see how these conversions are expected to go.
> > 
> > I couldn't find that in your first answer though. What corner cases do
> > you have in mind, and why do you think coccinelle can't handle them?
> 
> As can be seen from the reviews:
> 
> - sleeps between DSI calls
> - properly propagating the error at the end of the function

These two are legitimate feedback, but I don't see how coccinelle cannot
deal with them.

> - making decision whether to create the context at the caller or the
>   callee side. E.g. in patch 8 it is better to allocate context in
>   hx8394_enable() and pass it to .init_sequence() instead of keeping
>   some of error handling.

Yeah, that one is definitely subjective, and is going to need manual
review.

Maxime

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