On Wed, 2018-10-31 at 16:45 -0700, Dhinakaran Pandiyan wrote:
> On Thu, 2018-10-25 at 18:17 -0700, José Roberto de Souza wrote:
> > If a PSR error happened and the driver is reloaded, the EDP_PSR_IIR
> > will still keep the error set even after the reset done in the
> > irq_preinstall and irq_uninstall hooks.
>
> Does this happen or are you suspecting it might? Is this because IIR
> clearing did not work or is it because of a new unhandled interrupt?
It happens, it is cleared I can read it back right after clear it and
the value is correct but it is still set. I did some tests like clear
IIR with the interruption unmasked but it also don't work.
>
> -DK
>
>
>
> > And enabling in this situation cause the screen to freeze in the
> > first time that PSR HW tries to activate so lets keep PSR disabled
> > to avoid any rendering problems.
> >
> > Cc: Dhinakaran Pandiyan <dhinakaran.pandi...@intel.com>
> > Signed-off-by: José Roberto de Souza <jose.so...@intel.com>
> > ---
> > drivers/gpu/drm/i915/intel_psr.c | 13 +++++++++++++
> > 1 file changed, 13 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_psr.c
> > b/drivers/gpu/drm/i915/intel_psr.c
> > index 68201cc24d25..718270da1061 100644
> > --- a/drivers/gpu/drm/i915/intel_psr.c
> > +++ b/drivers/gpu/drm/i915/intel_psr.c
> > @@ -529,6 +529,19 @@ void intel_psr_compute_config(struct intel_dp
> > *intel_dp,
> > return;
> > }
> >
> > + /*
> > + * If a PSR error happened and the driver is reloaded, the
> > EDP_PSR_IIR
> > + * will still keep the error set even after the reset done in
> > the
> > + * irq_preinstall and irq_uninstall hooks.
> > + * And enabling in this situation cause the screen to freeze in
> > the
> > + * first time that PSR HW tries to activate so lets keep PSR
> > disabled
> > + * to avoid any rendering problems.
> > + */
> > + if (I915_READ(EDP_PSR_IIR) & EDP_PSR_ERROR(TRANSCODER_EDP)) {
> > + DRM_DEBUG_KMS("PSR interruption error set\n");
> > + return;
> > + }
> > +
> > if (IS_HASWELL(dev_priv) &&
> > I915_READ(HSW_STEREO_3D_CTL(crtc_state->cpu_transcoder)) &
> > S3D_ENABLE) {
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