On Thu, Nov 19, 2020 at 10:12:43AM +0100, Thomas Zimmermann wrote:
> Hi
>
> Am 05.11.20 um 14:56 schrieb Maxime Ripard:
> > The current HVS muxing code will consider the CRTCs in a given state to
> > setup their muxing in the HVS, and disable the other CRTCs muxes.
> >
> > However, it's valid to only update a single CRTC with a state, and in this
> > situation we would mux out a CRTC that was enabled but left untouched by
> > the new state.
> >
> > Fix this by setting a flag on the CRTC state when the muxing has been
> > changed, and only change the muxing configuration when that flag is there.
> >
> > Fixes: 87ebcd42fb7b ("drm/vc4: crtc: Assign output to channel
> > automatically")
> > Reviewed-by: Hoegeun Kwon <hoegeun.k...@samsung.com>
> > Tested-by: Hoegeun Kwon <hoegeun.k...@samsung.com>
> > Signed-off-by: Maxime Ripard <max...@cerno.tech>
> > ---
> > drivers/gpu/drm/vc4/vc4_drv.h | 1 +
> > drivers/gpu/drm/vc4/vc4_kms.c | 82 ++++++++++++++++++++---------------
> > 2 files changed, 48 insertions(+), 35 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h
> > index 014113823647..325b53ff11b3 100644
> > --- a/drivers/gpu/drm/vc4/vc4_drv.h
> > +++ b/drivers/gpu/drm/vc4/vc4_drv.h
> > @@ -524,6 +524,7 @@ struct vc4_crtc_state {
> > struct drm_mm_node mm;
> > bool feed_txp;
> > bool txp_armed;
> > + bool needs_muxing;
>
> Maybe rather 'update_muxing'.
>
> More generally, I'd separate fields that contain actual CRTC state, such
> assigned_channel, from those that only contain transitional state during
> update-commit, such as needs_muxing.How would you separate them? I'll use your other suggestions, thanks! Maxime
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