[Intel-gfx] [PATCH v5 6/9] drm/i915: Disable PSR2 while getting pipe CRC

[Dhinakaran Pandiyan]

On Tue, 2019-03-05 at 22:47 -0800, José Roberto de Souza wrote:
> When PSR2 is active aka after the number of frames programmed in
> PSR2_CTL 'Frames Before SU Entry' hardware stops to generate CRC
> interruptions causing IGT tests to fail due timeout.
s/interruptions/interrupts

I suppose there are no bugzilla references, since we do not check CRCs
in kms_psr and PSR2 is not enabled in kms_frontbuffer_tracking 
> 
> This same behavior don't happen with PSR1, as soon as pipe CRC is
> enabled it blocks PSR1 activation
The hardware also deactivates PSR1, not just block future PSR1
activation. Right?

>  so CRC calculation continues to
> happens normaly.
> 
> This patch also set mode_changed as true when PSR is available to
> force atomic check functions to compute new PSR state, otherwise PSR2
> would not be disabled.
> 
> v4: Only setting mode_changed if has_psr is set(Dhinakaran)
> 
> v3: Reusing intel_crtc_crc_prepare() and crc_enabled, only setting
> mode_changed if it can do PSR.
> 
> v2: Changed commit description to describe that PSR2 inhibit CRC
> calculations.
> 
> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_pipe_crc.c | 1 +
>  drivers/gpu/drm/i915/intel_psr.c      | 3 +++
>  2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_pipe_crc.c
> b/drivers/gpu/drm/i915/intel_pipe_crc.c
> index af64597c5c6e..c17f02b88453 100644
> --- a/drivers/gpu/drm/i915/intel_pipe_crc.c
> +++ b/drivers/gpu/drm/i915/intel_pipe_crc.c
> @@ -307,6 +307,7 @@ intel_crtc_crc_setup_workarounds(struct
> intel_crtc *crtc, bool enable)
>  		goto put_state;
>  	}
>  
> +	pipe_config->base.mode_changed = pipe_config->has_psr;
>  	pipe_config->crc_enabled = enable;
>  
>  	if (IS_HASWELL(dev_priv) && crtc->pipe == PIPE_A) {
> diff --git a/drivers/gpu/drm/i915/intel_psr.c
> b/drivers/gpu/drm/i915/intel_psr.c
> index 2d9f64c362e2..73453d89a841 100644
> --- a/drivers/gpu/drm/i915/intel_psr.c
> +++ b/drivers/gpu/drm/i915/intel_psr.c
> @@ -572,6 +572,9 @@ static bool intel_psr2_config_valid(struct
> intel_dp *intel_dp,
>  		return false;
>  	}
>  
> +	if (crtc_state->crc_enabled)
> +		return false;
No DRM_DEBUG_KMS()? 

with that added
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> +
>  	return true;
>  }
>