On Thu, Aug 04, 2016 at 10:59:57AM +0800, Bibby Hsieh wrote: > To properly implement atomic w/ runtime pm, we move > drm_atomic_helper_commit_modeset_enables() above > drm_atomic_helper_commit_planes() to ensure CRTCs are enabled before > modifying plane registers, and set active_only to true to filter out > plane update notifications when the CRTC is disabled. > > According to the document from linux kernel: > Set the active_only parameters to true in order not to receive plane > update notifications related to a disabled CRTC. This avoids the need > to manually ignore plane updates in driver code when the driver and/or > hardware can't or just don't need to deal with updates on disabled > CRTCs, for example when supporting runtime PM. > > Signed-off-by: Bibby Hsieh <bibby.hsieh@xxxxxxxxxxxx> > Signed-off-by: Daniel Kurtz <djkurtz@xxxxxxxxxxxx> btw if you want to clean up some more code, would be neat to switch mediatek to the generic nonblocking support in the atomic helpers instead of rolling your own. -Daniel > --- > drivers/gpu/drm/mediatek/mtk_drm_drv.c | 17 ++++++++++++++++- > 1 file changed, 16 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c > index b1223d5..507392a 100644 > --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c > +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c > @@ -61,10 +61,25 @@ static void mtk_atomic_complete(struct mtk_drm_private *private, > > mtk_atomic_wait_for_fences(state); > > + /* > + * Mediatek drm supports runtime PM, so plane registers cannot be > + * written when their crtc is disabled. > + * > + * The comment for drm_atomic_helper_commit states: > + * For drivers supporting runtime PM the recommended sequence is > + * > + * drm_atomic_helper_commit_modeset_disables(dev, state); > + * drm_atomic_helper_commit_modeset_enables(dev, state); > + * drm_atomic_helper_commit_planes(dev, state, true); > + * > + * See the kerneldoc entries for these three functions for more details. > + */ > drm_atomic_helper_commit_modeset_disables(drm, state); > - drm_atomic_helper_commit_planes(drm, state, false); > drm_atomic_helper_commit_modeset_enables(drm, state); > + drm_atomic_helper_commit_planes(drm, state, true); > + > drm_atomic_helper_wait_for_vblanks(drm, state); > + > drm_atomic_helper_cleanup_planes(drm, state); > drm_atomic_state_free(state); > } > -- > 1.7.9.5 > -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
