linux-kernel - Re: [PATCH 2/3] drm/format-helper: Add drm_fb_xrgb8888_to_xrgb2101010

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Message-ID: <20211122115247.257f30fa@eldfell>
Date:   Mon, 22 Nov 2021 11:52:47 +0200
From:   Pekka Paalanen <ppaalanen@...il.com>
To:     Hector Martin <marcan@...can.st>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] drm/format-helper: Add
 drm_fb_xrgb8888_to_xrgb2101010_dstclip()

On Wed, 17 Nov 2021 23:58:28 +0900
Hector Martin <marcan@...can.st> wrote:

> Add XRGB8888 emulation support for devices that can only do XRGB2101010.
> 
> This is chiefly useful for simpledrm on Apple devices where the
> bootloader-provided framebuffer is 10-bit, which already works fine with
> simplefb. This is required to make simpledrm support this too.
> 
> Signed-off-by: Hector Martin <marcan@...can.st>
> ---
>  drivers/gpu/drm/drm_format_helper.c | 64 +++++++++++++++++++++++++++++
>  include/drm/drm_format_helper.h     |  4 ++
>  2 files changed, 68 insertions(+)

Hi Hector,

I'm curious, since the bootloader seems to always set up a 10-bit mode,
is there a reason for it that you can guess? Is the monitor in WCG or
even HDR mode?


Thanks,
pq

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