linux-kernel - Re: [PATCH 0/2] Add "BACKGROUND

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Message-ID: <208def96-ac15-ce4e-7a0a-b555ea314fc5@foss.st.com>
Date:   Mon, 12 Jul 2021 17:50:16 +0200
From:   Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>
To:     Simon Ser <contact@...rsion.fr>
CC:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Yannick FERTRE - foss <yannick.fertre@...s.st.com>,
        Philippe CORNU - foss <philippe.cornu@...s.st.com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre TORGUE - foss <alexandre.torgue@...s.st.com>,
        Matt Roper <matthew.d.roper@...el.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Yannick FERTRE <yannick.fertre@...com>,
        Raphael GALLAIS-POU <raphael.gallais-pou@...com>,
        Philippe CORNU <philippe.cornu@...com>
Subject: Re: [PATCH 0/2] Add "BACKGROUND_COLOR" drm property


On 7/9/21 11:23 AM, Simon Ser wrote:
> On Friday, July 9th, 2021 at 11:09, Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com> wrote:
>
>> We don't usually test with piglit and igt-gpu-tools. Instead, modetest
>> utility of the libdrm is used quite often (as is it the case in order to
>> test this property).
> Just to make it extra clear: regardless of how you bring up your driver
> implementation, without an IGT test and real-world open-source user-space
> patches that make use of the new prop, your patches *cannot* be merged.
>
> If you're planning to add support for the new prop to an open-source KMS
> client, please add a link to the patches in your kernel submission. If
> you don't have plans to use the new prop in an open-source KMS client,
> let us know and we can discuss what the best candidate would be.

Hi,

Thanks for your feedback :)


We do not have any KMS client currently using this property apart from proprietary solutions made by consumers.

This property was originally made to display a logo picture when the screen is in idle (low power/low DDR usage).


Regards,

Raphaël


>> I was also thinking about implementing an option into modetest to ease
>> the use of this drm property (support of hexadecimal values for properties).
> (For the record, modeset doesn't count as a real-world user-space usage: it's
> just a toy implementation, just a test tool.)
>
> Simon