On Tue, Mar 13, 2018 at 08:04:03PM +0100, Maarten Lankhorst wrote: > Op 13-03-18 om 16:07 schreef Ville Syrjala: > > From: Ville Syrjälä <ville.syrj...@linux.intel.com> > > > > Ignore the vrefresh in the mode the user passed in and instead > > calculate the value based on the actual timings. This way we can > > actually trust mode->vrefresh to some degree. > > > > Or should we compare the user's idea of vrefresh with the one > > we get from the timings and return an error if they differ? We > > can't really be sure what the user is asking in that case. > > > > Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com> > > --- > > drivers/gpu/drm/drm_modes.c | 8 +++++++- > > 1 file changed, 7 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c > > index f6b7c0e36a1a..021526ec6fa0 100644 > > --- a/drivers/gpu/drm/drm_modes.c > > +++ b/drivers/gpu/drm/drm_modes.c > > @@ -1609,7 +1609,11 @@ int drm_mode_convert_umode(struct drm_device *dev, > > out->vsync_end = in->vsync_end; > > out->vtotal = in->vtotal; > > out->vscan = in->vscan; > > - out->vrefresh = in->vrefresh; > > + /* > > + * Ignore what the user is saying here and instead > > + * calculate vrefresh based on the actual timings. > > + */ > > + out->vrefresh = 0; > > out->flags = in->flags; > > out->type = in->type; > > strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN); > > @@ -1619,6 +1623,8 @@ int drm_mode_convert_umode(struct drm_device *dev, > > if (out->status != MODE_OK) > > return -EINVAL; > > > > + out->vrefresh = drm_mode_vrefresh(out); > > + > > drm_mode_set_crtcinfo(out, CRTC_INTERLACE_HALVE_V); > > > > return 0; > > Could we also get this with dim fixes tags dc911f5bd8aa, so we can backport > the alt mode handling patch?
Do we want/need to backport it actually? > > And update the documentation about vrefresh, that you can retrieve it with > drm_mode_vrefresh? The whole "return cached value if present, otherwise calculate but don't update the cached value" apporach always seemed off to me. Might be a good idea to change it somehow. Maybe just always calculate it, or do the cached value updates in sensible places so that you only have to calculate once. But I haven't actually checked how much work that would entail. -- Ville Syrjälä Intel OTC _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
