On Mon, 2015-08-24 at 14:14 +0000, Zanoni, Paulo R wrote:
> Em Qui, 2015-08-20 às 17:55 -0700, Rodrigo Vivi escreveu:
> > According to spec the disable sequence is:
> > Driver will do the following on PSR Disable.
> > 1. Disable PSR in PSR control register, SRD_CTL[bit 31].
> > 2. Poll on PSR idle
> > 3. Wait for VBlank
> > 4. Disable VSC DIP.
>
> Shouldn't this be done at intel_psr_exit() instead of
> intel_psr_disable()?
don't think this is a good idea...
>
> In case it's yes (which is my guess), then the wait_for_vblank() is
> probably going to slow down everything, so we may need to use some
> sort
> of delayed work.
delayed work wouldn't help because locks would still block the exit...
>
> In case it's no, then I don't think we need the wait_for_vblank()
> since
> the encoder disable only happens after the pipe disable.
hm indeed... so I believe just ignore this patch for now since it works
without this...
>
> >
> > Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/intel_psr.c | 10 ++++++++++
> > 1 file changed, 10 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_psr.c
> > b/drivers/gpu/drm/i915/intel_psr.c
> > index 51f0514..92e2b467 100644
> > --- a/drivers/gpu/drm/i915/intel_psr.c
> > +++ b/drivers/gpu/drm/i915/intel_psr.c
> > @@ -459,6 +459,10 @@ static void hsw_psr_disable(struct intel_dp
> > *intel_dp)
> > struct intel_digital_port *intel_dig_port =
> > dp_to_dig_port(intel_dp);
> > struct drm_device *dev = intel_dig_port->base.base.dev;
> > struct drm_i915_private *dev_priv = dev->dev_private;
> > + struct drm_crtc *crtc = intel_dig_port->base.base.crtc;
> > + enum pipe pipe = to_intel_crtc(crtc)->pipe;
> > + struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> > + u32 ctl_reg = HSW_TVIDEO_DIP_CTL(intel_crtc->config
> > ->cpu_transcoder);
> >
> > if (dev_priv->psr.active) {
> > I915_WRITE(EDP_PSR_CTL(dev),
> > @@ -469,6 +473,12 @@ static void hsw_psr_disable(struct intel_dp
> > *intel_dp)
> > EDP_PSR_STATUS_STATE_MASK) == 0,
> > 2000, 10))
> > DRM_ERROR("Timed out waiting for PSR Idle
> > State\n");
> >
> > + intel_wait_for_vblank(dev, pipe);
> > +
> > + I915_WRITE(ctl_reg, I915_READ(ctl_reg)
> > + & ~VIDEO_DIP_ENABLE_VSC_HSW);
> > + POSTING_READ(ctl_reg);
> > +
> > dev_priv->psr.active = false;
> > } else {
> > WARN_ON(I915_READ(EDP_PSR_CTL(dev)) &
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