On Thu, Jan 23, 2020 at 08:31:55PM +0200, Ville Syrjälä wrote:
> On Thu, Jan 23, 2020 at 06:25:29PM +0000, Souza, Jose wrote:
> > On Wed, 2020-01-22 at 16:24 -0800, Manasi Navare wrote:
> > > In the port sync mode, for the master crtc, the master_transcoder is
> > > INVALID.
> > > In that case since its value is -1, do not set the bit in the
> > > bitmask.
> > >
> > > Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > > Fixes: d0eed1545fe7 ("drm/i915: Fix post-fastset modeset check for
> > > port sync")
> > > Signed-off-by: Manasi Navare <manasi.d.navare@xxxxxxxxx>
> > > ---
> > > drivers/gpu/drm/i915/display/intel_display.c | 6 ++++--
> > > 1 file changed, 4 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> > > b/drivers/gpu/drm/i915/display/intel_display.c
> > > index 878d331b9e8c..79f9054078ea 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_display.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_display.c
> > > @@ -14649,8 +14649,10 @@ static int intel_atomic_check(struct
> > > drm_device *dev,
> > > }
> > >
> > > if (is_trans_port_sync_mode(new_crtc_state)) {
> > > - u8 trans = new_crtc_state-
> > > >sync_mode_slaves_mask |
> > > - BIT(new_crtc_state-
> > > >master_transcoder);
> > > + u8 trans = new_crtc_state-
> > > >sync_mode_slaves_mask;
> > > +
> > > + if (new_crtc_state->master_transcoder !=
> > > INVALID_TRANSCODER)
> > > + trans |= BIT(new_crtc_state-
> > > >master_transcoder);
> >
> > Why not set master_transcoder in port sync master too? Would avoid have
> > this check here and in future other places.
>
> Not how the hardware works. So would complicate hw readout and
> programming code needlessly.
Yes and thats how we identify that it is the master since its master trans is INVALID
Manasi
>
> >
> > >
> > > if (intel_cpu_transcoders_need_modeset(state,
> > > trans)) {
> > > new_crtc_state->uapi.mode_changed =
> > > true;
>
> --
> Ville Syrjälä
> Intel
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