On Mon, Dec 16, 2019 at 07:27:25PM +0200, Ville Syrjälä wrote:
> On Mon, Dec 16, 2019 at 06:10:17PM +0100, Stephan Gerhold wrote:
> > At the moment, video mode parameters like video=540x960,reflect_x,
> > (without rotation set) are not taken into account when applying the
> > mode in drm_client_modeset.c.
>
> A rotation value without exactly one rotation angle is illegal.
> IMO the code should not generate a value like that in the first
> place.
>
You're right. I was thinking about this when creating this patch.
But then I was not sure if "mode->rotation_reflection" is supposed to be
a valid rotation value.The zero value is currently used to check
if any rotation/reflection was specified at all:
[...]
> > diff --git a/drivers/gpu/drm/drm_client_modeset.c b/drivers/gpu/drm/drm_client_modeset.c
> > index 895b73f23079..cfebce4f19a5 100644
> > --- a/drivers/gpu/drm/drm_client_modeset.c
> > +++ b/drivers/gpu/drm/drm_client_modeset.c
> > @@ -859,19 +859,23 @@ bool drm_client_rotation(struct drm_mode_set *modeset, unsigned int *rotation)
> > */
> > cmdline = &connector->cmdline_mode;
> > if (cmdline->specified && cmdline->rotation_reflection) {
I can try to make your suggested change in the cmdline parsing code,
but since this sounds like a larger change I would appreciate
some other opinions first.
Thanks,
Stephan
> >
> > - unsigned int cmdline_rest, panel_rest;
> > - unsigned int cmdline_rot, panel_rot;
> > - unsigned int sum_rot, sum_rest;
> > + if (cmdline->rotation_reflection & DRM_MODE_ROTATE_MASK) {
> > + unsigned int cmdline_rest, panel_rest;
> > + unsigned int cmdline_rot, panel_rot;
> > + unsigned int sum_rot, sum_rest;
> >
> > - panel_rot = ilog2(*rotation & DRM_MODE_ROTATE_MASK);
> > - cmdline_rot = ilog2(cmdline->rotation_reflection & DRM_MODE_ROTATE_MASK);
> > - sum_rot = (panel_rot + cmdline_rot) % 4;
> > + panel_rot = ilog2(*rotation & DRM_MODE_ROTATE_MASK);
> > + cmdline_rot = ilog2(cmdline->rotation_reflection & DRM_MODE_ROTATE_MASK);
> > + sum_rot = (panel_rot + cmdline_rot) % 4;
> >
> > - panel_rest = *rotation & ~DRM_MODE_ROTATE_MASK;
> > - cmdline_rest = cmdline->rotation_reflection & ~DRM_MODE_ROTATE_MASK;
> > - sum_rest = panel_rest ^ cmdline_rest;
> > + panel_rest = *rotation & ~DRM_MODE_ROTATE_MASK;
> > + cmdline_rest = cmdline->rotation_reflection & ~DRM_MODE_ROTATE_MASK;
> > + sum_rest = panel_rest ^ cmdline_rest;
> >
> > - *rotation = (1 << sum_rot) | sum_rest;
> > + *rotation = (1 << sum_rot) | sum_rest;
> > + } else {
> > + *rotation ^= cmdline->rotation_reflection;
> > + }
> > }
> >
> > /*
> > @@ -879,7 +883,8 @@ bool drm_client_rotation(struct drm_mode_set *modeset, unsigned int *rotation)
> > * depending on the hardware this may require the framebuffer
> > * to be in a specific tiling format.
> > */
> > - if ((*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_180 ||
> > + if (((*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_0 &&
> > + (*rotation & DRM_MODE_ROTATE_MASK) != DRM_MODE_ROTATE_180) ||
> > !plane->rotation_property)
> > return false;
> >
> > --
> > 2.24.1
> >
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@xxxxxxxxxxxxxxxxxxxxx
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
> --
> Ville Syrjälä
> Intel
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