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From: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
To: "Raphael Gallais-Pou" <raphael.gallais-pou@foss.st.com>,
	"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
	"Maxime Ripard" <mripard@kernel.org>,
	"Thomas Zimmermann" <tzimmermann@suse.de>,
	"David Airlie" <airlied@gmail.com>,
	"Simona Vetter" <simona@ffwll.ch>,
	"Sandy Huang" <hjc@rock-chips.com>,
	"Heiko Stübner" <heiko@sntech.de>,
	"Andy Yan" <andy.yan@rock-chips.com>
Cc: kernel@collabora.com, dri-devel@lists.freedesktop.org,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-rockchip@lists.infradead.org,
	Matt Roper <matthew.d.roper@intel.com>
Subject: Re: [PATCH 0/2] Introduce BACKGROUND_COLOR DRM CRTC property
Date: Tue, 2 Sep 2025 19:04:50 +0300	[thread overview]
Message-ID: <fc9baa6d-ed38-478b-9338-8a76986639da@collabora.com> (raw)
In-Reply-To: <50e3f25c-f4e1-40f6-8e36-23193863f1ee@foss.st.com>

Hi Raphael,

On 9/2/25 4:19 PM, Raphael Gallais-Pou wrote:
> 
> 
> On 9/2/25 11:27, Cristian Ciocaltea wrote:
>> Some display controllers can be hardware-configured to present non-black
>> colors for pixels which are not covered by any plane (or are exposed
>> through transparent regions of higher planes).
>>
>> The first patch of the series introduces the BACKGROUND_COLOR DRM
>> property that can be attached to a CRTC via a dedicated helper function.
>> A 64-bit ARGB color value format is also defined and can be manipulated
>> with the help of a few utility macros.
> 
> Hi Cristian,
> 
> Thanks for this work ! :)
> 
> FWIW I sent a series also based on Matt's work four years ago:
> https://lore.kernel.org/dri-devel/20210707084557.22443-2-raphael.gallais-pou@foss.st.com/
> 
> IIRC at the time there was some questions around the pixel format used for the
> property, and non-opaque color vs alpha pre-multiplication.
> Mind that on STM32MP platforms alpha channel for the background color is not
> supported.
> 
> Hope the thread can bring some insights.

Thanks for pointing this out, I will consider it for v2.

Regards,
Cristian

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      reply	other threads:[~2025-09-02 19:26 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-09-02  9:27 [PATCH 0/2] Introduce BACKGROUND_COLOR DRM CRTC property Cristian Ciocaltea
2025-09-02  9:27 ` [PATCH 1/2] drm: Add CRTC background color property Cristian Ciocaltea
2025-09-02 13:36   ` Ville Syrjälä
2025-09-02 16:26     ` Cristian Ciocaltea
2025-09-02  9:27 ` [PATCH 2/2] drm/rockchip: vop2: Support setting custom background color Cristian Ciocaltea
2025-09-02 13:19 ` [PATCH 0/2] Introduce BACKGROUND_COLOR DRM CRTC property Raphael Gallais-Pou
2025-09-02 16:04   ` Cristian Ciocaltea [this message]

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