linux-kernel - Re: [RFC PATCH] drm/bridge: ti-sn65dsi86: Enable HPD functionality

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Message-ID: <f0966aa4-0945-425e-9d89-370eafe13ac1@kernel.org>
Date: Fri, 25 Apr 2025 07:34:46 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Jayesh Choudhary <j-choudhary@...com>, dianders@...omium.org,
 andrzej.hajda@...el.com, neil.armstrong@...aro.org, rfoss@...nel.org,
 Laurent.pinchart@...asonboard.com, dri-devel@...ts.freedesktop.org,
 tomi.valkeinen@...asonboard.com
Cc: jonas@...boo.se, jernej.skrabec@...il.com,
 maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de,
 airlied@...il.com, simona@...ll.ch, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] drm/bridge: ti-sn65dsi86: Enable HPD functionality

On 24/04/2025 12:54, Jayesh Choudhary wrote:
> For TI SoC J784S4, the display pipeline looks like:
> TIDSS -> CDNS-DSI -> SN65DSI86 -> DisplayConnector -> DisplaySink
> This requires HPD to detect connection form the connector.
> By default, the HPD is disabled for eDP. So enable it conditionally
> based on a new flag 'keep-hpd' as mentioned in the comments in the
> driver.
> 
> Signed-off-by: Jayesh Choudhary <j-choudhary@...com>
> ---
> 
> Hello All,
> 
> Sending this RFC patch to get some thoughts on hpd for sn65dsi86.

Please run scripts/checkpatch.pl on the patches and fix reported
warnings. After that, run also 'scripts/checkpatch.pl --strict' on the
patches and (probably) fix more warnings. Some warnings can be ignored,
especially from --strict run, but the code here looks like it needs a
fix. Feel free to get in touch if the warning is not clear.

<form letter>
Please use scripts/get_maintainers.pl to get a list of necessary people
and lists to CC. It might happen, that command when run on an older
kernel, gives you outdated entries. Therefore please be sure you base
your patches on recent Linux kernel.

Tools like b4 or scripts/get_maintainer.pl provide you proper list of
people, so fix your workflow. Tools might also fail if you work on some
ancient tree (don't, instead use mainline) or work on fork of kernel
(don't, instead use mainline). Just use b4 and everything should be
fine, although remember about `b4 prep --auto-to-cc` if you added new
patches to the patchset.

You missed at least devicetree list (maybe more), so this won't be
tested by automated tooling. Performing review on untested code might be
a waste of time.

Please kindly resend and include all necessary To/Cc entries.
</form letter>

(But if intention was not to get review, then of course it is fine)

Best regards,
Krzysztof