linux-kernel - Re: [PATCH v7] rockchip/drm: vop2: add support for gamma LUT

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Message-ID: <12938960.VsHLxoZxqI@diego>
Date: Thu, 05 Dec 2024 09:54:09 +0100
From: Heiko Stübner <heiko@...ech.de>
To: hjc@...k-chips.com, andy.yan@...k-chips.com,
 maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de,
 airlied@...il.com, simona@...ll.ch, dri-devel@...ts.freedesktop.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 linux-kernel@...r.kernel.org, Piotr Zalewski <pZ010001011111@...ton.me>
Cc: skhan@...uxfoundation.org, Piotr Zalewski <pZ010001011111@...ton.me>,
 Daniel Stone <daniel@...ishbar.org>, Dragan Simic <dsimic@...jaro.org>,
 Diederik de Haas <didi.debian@...ow.org>
Subject: Re: [PATCH v7] rockchip/drm: vop2: add support for gamma LUT

Hi Piotr,

Am Mittwoch, 4. Dezember 2024, 16:45:21 CET schrieb Piotr Zalewski:
> I just noticed that after coming out of suspend gamma LUT is lost and must
> be rewritten by userspace.
> 
> So I guess it will be needed to save LUT to a buffer and rewrite it after
> going out of suspend during modeset?

Most likely ... the old vop does this already too, so I guess you can
get inspiration from there. (gamma_set call in vop_crtc_atomic_enable())

> I checked the patch isn't yet in the "official" linux-next.

The patch is in drm-misc-next:
https://gitlab.freedesktop.org/drm/misc/kernel/-/commit/4f537776340dab2b680a4d8554567f6884240d0b

so should turn up in linux-next at some point. This also means, please
provide a follow-up patch for the suspend handling.

Thanks a lot
Heiko