linux-kernel - Re: [PATCH v2] drm/virtio: Add suppport for non-native buffer formats

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Message-ID: <1bd6d2c8-007b-46f7-85b4-9793ec650f94@xenosoft.de>
Date:   Sat, 25 Nov 2023 13:35:54 +0100
From:   Christian Zigotzky <chzigotzky@...osoft.de>
To:     John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Gerd Hoffmann <kraxel@...hat.com>,
        David Airlie <airlied@...hat.com>,
        Gurchetan Singh <gurchetansingh@...omium.org>,
        Chia-I Wu <olvaffe@...il.com>, Daniel Vetter <daniel@...ll.ch>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Laurent Vivier <lvivier@...hat.com>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Hamza Mahfooz <hamza.mahfooz@....com>,
        linux-m68k@...ts.linux-m68k.org, dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, "R.T.Dickinson" <rtd2@...a.co.nz>,
        mad skateman <madskateman@...il.com>,
        Christian Zigotzky <info@...osoft.de>
Subject: Re: [PATCH v2] drm/virtio: Add suppport for non-native buffer formats

On 25 November 2023 at 01:22 pm, Christian Zigotzky wrote:
> On 25 November 2023 at 12:09 pm, John Paul Adrian Glaubitz wrote:
>> On Sat, 2023-11-25 at 11:06 +0100, Christian Zigotzky wrote:
>>> Could you please revert the v2 patch because of the issue with the
>>> virtio-mouse-pci cursor? I will try to use the v1 patch for the RC3 of
>>> kernel 6.7.
>> I don't understand why the v2 patch should yield any different 
>> results as
>> the only change compared to v1 is the fixed patch subject. There are no
>> functional differences, I just diffed the patches against each other:
>>
>> --- geert-patch-v1.patch        2023-11-25 12:09:19.122936658 +0100
>> +++ geert-patch-v2.patch        2023-11-25 12:09:36.313039085 +0100
>> @@ -34,6 +34,9 @@
>>   Suggested-by: Gerd Hoffmann <kraxel@...hat.com>
>>   Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
>>   ---
>> +v2:
>> +  - Fix truncated one-line summary.
>> +---
>>    drivers/gpu/drm/virtio/virtgpu_display.c | 11 +++++++++--
>>    drivers/gpu/drm/virtio/virtgpu_plane.c   |  6 ++++--
>>    2 files changed, 13 insertions(+), 4 deletions(-)
>>
>> Adrian
>>
> Hi Adrian,
>
> Thank you for the hint. I think you are right. I use the following patch.
>
> --- a/drivers/gpu/drm/drm_client.c    2023-11-13 01:19:07.000000000 +0100
> +++ b/drivers/gpu/drm/drm_client.c    2023-11-14 09:45:44.964199272 +0100
> @@ -400,6 +400,16 @@ static int drm_client_buffer_addfb(struc
>
>      fb_req.width = width;
>      fb_req.height = height;
> +           if 
> (client->dev->mode_config.quirk_addfb_prefer_host_byte_order) {
> +               if (format == DRM_FORMAT_XRGB8888)
> +                       format = DRM_FORMAT_HOST_XRGB8888;
> +               if (format == DRM_FORMAT_ARGB8888)
> +                       format = DRM_FORMAT_HOST_ARGB8888;
> +               if (format == DRM_FORMAT_RGB565)
> +                       format = DRM_FORMAT_HOST_RGB565;
> +               if (format == DRM_FORMAT_XRGB1555)
> +                       format = DRM_FORMAT_HOST_XRGB1555;
> +        }
>      fb_req.pixel_format = format;
>      fb_req.handles[0] = handle;
>      fb_req.pitches[0] = buffer->pitch;
>
> This patch solved the issue.
>
> Christian
This was the first solution and it works without any problems.

Christian