[Intel-gfx] [PATCH v3 2/2] drm/i915/display/psr: Clear more PSR state during disable

[Hogander, Jouni]

On Thu, 2022-04-14 at 08:11 -0700, José Roberto de Souza wrote:
> After commit 805f04d42a6b ("drm/i915/display/psr: Use continuos full
> frame to handle frontbuffer invalidations") was merged we started to
> get some drm_WARN_ON(&dev_priv->drm, !(tmp &
> PSR2_MAN_TRK_CTL_ENABLE))
> in tests that are executed in pipe B.
> 
> This is probably due psr2_sel_fetch_cff_enabled being left set during
> PSR disable in the pipe A, so the PSR2_MAN_TRK_CTL write in
> intel_psr2_program_trans_man_trk_ctl() is skipped in pipe B and then
> we get the warning when actually enabling PSR after planes
> programing.
> We don't get such warnings when running tests in pipe A because
> PSR2_MAN_TRK_CTL is only cleared when enabling PSR2 with hardware
> tracking.
> 
> Was not able to reproduce this issue but cleaning the PSR state
> disable will not harm anything at all.

Reviewed-by: Jouni Högander <jouni.hogander at intel.com>

> 
> Fixes: 805f04d42a6b ("drm/i915/display/psr: Use continuos full frame
> to handle frontbuffer invalidations")
> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/5634
> Cc: Jouni Högander <jouni.hogander at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_psr.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c
> b/drivers/gpu/drm/i915/display/intel_psr.c
> index 8ec7c161284be..06db407e2749f 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -1353,6 +1353,9 @@ static void intel_psr_disable_locked(struct
> intel_dp *intel_dp)
>  		drm_dp_dpcd_writeb(&intel_dp->aux,
> DP_RECEIVER_ALPM_CONFIG, 0);
>  
>  	intel_dp->psr.enabled = false;
> +	intel_dp->psr.psr2_enabled = false;
> +	intel_dp->psr.psr2_sel_fetch_enabled = false;
> +	intel_dp->psr.psr2_sel_fetch_cff_enabled = false;
>  }
>  
>  /**