linux-kernel - Re: [PATCH v2 04/10] drm/fourcc: Add DRM_FORMAT_Y10

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Message-ID: <3bcc862d-f63c-41fc-89a5-74993b68d636@ideasonboard.com>
Date: Wed, 15 Jan 2025 18:07:43 +0200
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Vishal Sagar <vishal.sagar@....com>,
 Anatoliy Klymenko <anatoliy.klymenko@....com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Michal Simek <michal.simek@....com>, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 04/10] drm/fourcc: Add DRM_FORMAT_Y10_LE32

On 15/01/2025 16:49, Geert Uytterhoeven wrote:
> Hi Tomi,
> 
> On Wed, Jan 15, 2025 at 3:34 PM Tomi Valkeinen
> <tomi.valkeinen@...asonboard.com> wrote:
>> On 15/01/2025 16:08, Geert Uytterhoeven wrote:
>>> On Wed, Jan 15, 2025 at 2:46 PM Tomi Valkeinen
>>> <tomi.valkeinen@...asonboard.com> wrote:
>>>> On 15/01/2025 14:52, Geert Uytterhoeven wrote:
>>>>> On Wed, Jan 15, 2025 at 1:42 PM Tomi Valkeinen
>>>>> <tomi.valkeinen@...asonboard.com> wrote:
>>>>>> On 15/01/2025 14:33, Geert Uytterhoeven wrote:
>>>>>>> On Wed, Jan 15, 2025 at 12:11 PM Tomi Valkeinen
>>>>>>> <tomi.valkeinen@...asonboard.com> wrote:
>>>>>>>> On 15/01/2025 12:33, Geert Uytterhoeven wrote:
>>>>>>>>> On Wed, Jan 15, 2025 at 10:04 AM Tomi Valkeinen
>>>>>>>>> <tomi.valkeinen@...asonboard.com> wrote:
>>>>>>>>>> Add Y10_LE32, a 10 bit greyscale format, with 3 pixels packed into
>>>>>>>>>> 32-bit container.
> 
>> Well, this is all somewhat beside the point. So is "_Y10_32" (or
>> "_R10_32" if we use R) fine?
> 
> IAARDD[*], but "10_32" makes me think it stores one 10-bit pixel in a
> 32-bit word (i.e. a 32-bit variant of R10). So [YR]PA4 would be better.

That would be a very silly format. So I think some HW guy is already 
designing chips that have it.

[YR]10_PACKED_32? We can have longer names, we don't need to do encoding 
like [YR]PA4.

> [*] I am a rookie DRM developer...

I haven't heard that before...

  Tomi