linux-kernel - Re: [PATCH v2 5/8] drm/client: Convert drm_client_buffer_addfb() to drm_mode

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Date:   Tue, 29 Aug 2023 11:19:58 +0200
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Daniel Stone <daniel@...ishbar.org>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 5/8] drm/client: Convert drm_client_buffer_addfb() to
 drm_mode_addfb2()

Geert Uytterhoeven <geert@...ux-m68k.org> writes:

Hello Geert and Daniel,

> Hi Daniel,
>
> On Thu, Aug 24, 2023 at 5:12 PM Daniel Stone <daniel@...ishbar.org> wrote:
>> On Thu, 24 Aug 2023 at 16:09, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>> >         struct drm_client_dev *client = buffer->client;
>> > -       struct drm_mode_fb_cmd fb_req = { };
>> > -       const struct drm_format_info *info;
>> > +       struct drm_mode_fb_cmd2 fb_req = { };
>> >         int ret;
>> >
>> > -       info = drm_format_info(format);
>> > -       fb_req.bpp = drm_format_info_bpp(info, 0);
>> > -       fb_req.depth = info->depth;
>> >         fb_req.width = width;
>> >         fb_req.height = height;
>> > -       fb_req.handle = handle;
>> > -       fb_req.pitch = buffer->pitch;
>> > +       fb_req.pixel_format = format;
>> > +       fb_req.handles[0] = handle;
>> > +       fb_req.pitches[0] = buffer->pitch;
>> >
>> > -       ret = drm_mode_addfb(client->dev, &fb_req, client->file);
>> > +       ret = drm_mode_addfb2(client->dev, &fb_req, client->file);
>> >         if (ret)
>> >                 return ret;
>>
>> This should explicitly set the LINEAR modifier (and the modifier flag)
>> if the driver supports modifiers.
>
> Thanks for your comment!
>
> I have no idea how to do that, and I do not know what the impact
> would be.  All I know is that the current implementation of
> drm_client_buffer_addfb() does not do that, so changing that in this
> patch would mean that this would no longer be a trivial conversion.
>

Agree with Geert, this patch basically just inlines the drm_mode_addfb()
implementation which already calls drm_mode_addfb2() but without setting
a struct drm_mode_fb_cmd2 .modifier field or anything modififers related.

So if that is wrong then it should be done as a follow-up patch (which
should also fix the drm_mode_addfb() helper implementation) ?

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat