linux-kernel - Re: [PATCH] drm/cirrus: rewrite and modernize driver.

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Message-ID: <0c959f3a-15e9-8295-dc11-2f6b9a4229ac@tronnes.org>
Date:   Wed, 3 Apr 2019 11:58:06 +0200
From:   Noralf Trønnes <noralf@...nnes.org>
To:     Gerd Hoffmann <kraxel@...hat.com>, Daniel Vetter <daniel@...ll.ch>
Cc:     David Airlie <airlied@...ux.ie>, Dave Airlie <airlied@...hat.com>,
        open list <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "open list:DRM DRIVER FOR QEMU'S CIRRUS DEVICE" 
        <virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH] drm/cirrus: rewrite and modernize driver.

Den 03.04.2019 10.53, skrev Gerd Hoffmann:
>>> +struct cirrus_device {
>>> +       struct drm_device              *dev;
>>
>> Why not embed drm_device? It's the latest rage :-)
> 
> Sure, can do that.
> 
>>> +void cirrus_pipe_update(struct drm_simple_display_pipe *pipe,
>>> +                       struct drm_plane_state *old_state)
>>> +{
>>> +       struct drm_plane_state *state = pipe->plane.state;
>>> +       struct drm_crtc *crtc = &pipe->crtc;
>>> +       struct drm_rect rect;
>>> +
>>> +       if (drm_atomic_helper_damage_merged(old_state, state, &rect))
>>> +               cirrus_fb_blit_rect(pipe->plane.state->fb, &rect);
>>> +
>>> +       if (crtc->state->event) {
>>> +               spin_lock_irq(&crtc->dev->event_lock);
>>> +               drm_crtc_send_vblank_event(crtc, crtc->state->event);
>>> +               spin_unlock_irq(&crtc->dev->event_lock);
>>> +               crtc->state->event = NULL;
>>> +       }
>>> +}
> 
>>> +static int cirrus_fb_dirty(struct drm_framebuffer *fb,
>>> +                          struct drm_file *file_priv,
>>> +                          unsigned int flags, unsigned int color,
>>> +                          struct drm_clip_rect *clips,
>>> +                          unsigned int num_clips)
>>> +{
>>> +       struct cirrus_device *cirrus = fb->dev->dev_private;
>>> +
>>> +       if (cirrus->pipe.plane.state->fb != fb)
>>> +               return 0;
>>> +
>>> +       if (num_clips)
>>> +               cirrus_fb_blit_clips(fb, clips, num_clips);
>>> +       else
>>> +               cirrus_fb_blit_fullscreen(fb);
>>> +       return 0;
>>> +}
>>
>> Why not use the dirty helpers and implement dirty rect support in your
>> main plane update function?
> 
> Dirty rect support is already there, see above.
> 
> So I can just remove cirrus_fb_dirty() and hook up
> drm_atomic_helper_dirtyfb() instead.  Easy ;)
> 

You can even use drm_gem_fb_create_with_dirty() instead of
drm_gem_fb_create_with_funcs().

Noralf.

> cheers,
>   Gerd
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 

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