On Mon, Mar 05, 2018 at 05:44:16PM -0500, Harry Wentland wrote:
> On 2018-03-05 04:33 PM, Alex Deucher wrote:
> > On Mon, Mar 5, 2018 at 4:15 PM, Ville Syrjälä
> > <ville.syrjala@xxxxxxxxxxxxxxx> wrote:
> >> On Mon, Mar 05, 2018 at 12:59:00PM -0800, Eric Anholt wrote:
> >>> Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx> writes:
> >>>
> >>>> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> >>>>
> >>>> To make life easier for drivers, let's have the core check that the
> >>>> requested pixel format is supported by at least one plane when creating
> >>>> a new framebuffer.
> >>>>
> >>>> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> >>>> ---
> >>>> drivers/gpu/drm/drm_framebuffer.c | 26 ++++++++++++++++++++++++++
> >>>> 1 file changed, 26 insertions(+)
> >>>>
> >>>> diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
> >>>> index c0530a1af5e3..155b21e579c4 100644
> >>>> --- a/drivers/gpu/drm/drm_framebuffer.c
> >>>> +++ b/drivers/gpu/drm/drm_framebuffer.c
> >>>> @@ -152,6 +152,23 @@ static int fb_plane_height(int height,
> >>>> return DIV_ROUND_UP(height, format->vsub);
> >>>> }
> >>>>
> >>>> +static bool planes_have_format(struct drm_device *dev, u32 format)
> >>>> +{
> >>>> + struct drm_plane *plane;
> >>>> +
> >>>> + /* TODO: maybe maintain a device level format list? */
> >>>> + drm_for_each_plane(plane, dev) {
> >>>> + int i;
> >>>> +
> >>>> + for (i = 0; i < plane->format_count; i++) {
> >>>> + if (plane->format_types[i] == format)
> >>>> + return true;
> >>>> + }
> >>>> + }
> >>>> +
> >>>> + return false;
> >>>> +}
> >>>> +
> >>>> static int framebuffer_check(struct drm_device *dev,
> >>>> const struct drm_mode_fb_cmd2 *r)
> >>>> {
> >>>> @@ -168,6 +185,15 @@ static int framebuffer_check(struct drm_device *dev,
> >>>> return -EINVAL;
> >>>> }
> >>>>
> >>>> + if (!planes_have_format(dev, r->pixel_format)) {
> >>>> + struct drm_format_name_buf format_name;
> >>>> +
> >>>> + DRM_DEBUG_KMS("unsupported framebuffer format %s\n",
> >>>> + drm_get_format_name(r->pixel_format,
> >>>> + &format_name));
> >>>> + return -EINVAL;
> >>>> + }
> >>>> +
> >>>
> >>> Won't this break KMS on things like the radeon driver, which doesn't do
> >>> planes? Maybe check if any universal planes have been registered and
> >>> only do the check in that case?
> >>
> >> Hmm. I thought we add the implicit planes always. Apparently
> >> drm_crtc_init() adds a primary with X/ARGB8888, but no more. So
> >> this would break all other formats, which is probably a bit too
> >> aggressive.
> >>
> >> I guess I could just skip the check in case any plane has
> >> plane->format_default set. That should be indicating that the driver
> >> doesn't do planes fully. Oh, why exactly is amggpu setting that flag?
> >> Harry?
> >
> > Probably leftover from DC bringup?
>
> I'm not sure if I'm following. Which flag are we talking about?
>
> Is the concern the DC driver or amdgpu with DC (or radeon)?
>
> DC does not call drm_crtc_init(). It initializes universal planes in amdgpu_dm_initialize_drm_device() -> amdgpu_dm_plane_init().
>
> From a quick glance this patch looks fine by me.
>From amdgpu_dm_plane_init:
aplane->base.format_default = true;
^^ this is entirely bogus, pls remove.
res = drm_universal_plane_init(
dm->adev->ddev,
&aplane->base,
possible_crtcs,
&dm_plane_funcs,
rgb_formats,
ARRAY_SIZE(rgb_formats),
NULL, aplane->base.type, NULL);
Wrt discussions: Also checking whether any plane has set
plane->format_default and aborting the check should keep old kms drivers
working I hope.
Cheers, Daniel
>
> Harry
>
> >
> > Alex
> >
> >>
> >>>
> >>> Also, "any_planes_have_format()" might be slightly more descriptive.
> >>
> >> Or any_plane_has_format()? Is that more englishy? :)
> >>
> >> --
> >> Ville Syrjälä
> >> Intel OTC
> >> _______________________________________________
> >> dri-devel mailing list
> >> dri-devel@xxxxxxxxxxxxxxxxxxxxx
> >> https://lists.freedesktop.org/mailman/listinfo/dri-devel
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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