After applying this patch, the psr screen glitch issue is still seen.
On Fri, 2020-10-02 at 16:16 -0700, José Roberto de Souza wrote:
> Writes to CURSURFLIVE in TGL are causing IOMMU errors and visual
> glitches that are often reproduced when executing CPU intensive
> workloads while a eDP 4K panel is attached.
>
> Manually exiting PSR causes the frontbuffer to be updated without
> glitches and the IOMMU errors are also gone but this comes at the
> cost
> of less time with PSR active.
>
> So using this workaround until this issue is root caused and a better
> fix is found.
>
> The current code is already ready to enable PSR after this exit if
> there is not other frontbuffer modifications.
>
> Adding a new if block in psr_force_hw_tracking_exit() instead of
> reuse
> the else/gen8- block because the plan is to revert this workaround
> as soon as a better solution is found.
>
> Cc: Gwan-gyeong Mun <gwan-gyeong....@intel.com>
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Signed-off-by: José Roberto de Souza <jose.so...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_psr.c | 16 +++++++++++++++-
> 1 file changed, 15 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c
> b/drivers/gpu/drm/i915/display/intel_psr.c
> index 8a9d0bdde1bf..8630121dbbbe 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -1152,7 +1152,21 @@ void intel_psr_disable(struct intel_dp
> *intel_dp,
>
> static void psr_force_hw_tracking_exit(struct drm_i915_private
> *dev_priv)
> {
> - if (INTEL_GEN(dev_priv) >= 9)
> + if (IS_TIGERLAKE(dev_priv))
> + /*
> + * Writes to CURSURFLIVE in TGL are causing IOMMU
> errors and
> + * visual glitches that are often reproduced when
> executing
> + * CPU intensive workloads while a eDP 4K panel is
> attached.
> + *
> + * Manually exiting PSR causes the frontbuffer to be
> updated
> + * without glitches and the IOMMU errors are also gone
> but
> + * this comes at the cost of less time with PSR active.
> + *
> + * So using this workaround until this issue is root
> caused
> + * and a better fix is found.
> + */
> + intel_psr_exit(dev_priv);
> + else if (INTEL_GEN(dev_priv) >= 9)
> /*
> * Display WA #0884: skl+
> * This documented WA for bxt can be safely applied
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