[Intel-gfx] [PATCH] drm/i915/psr: fix blank screen issue for psr2

[Jim Bride]

On Wed, Dec 14, 2016 at 09:02:44PM +0530, vathsala nagaraju wrote:
> when psr2 is enabled, psr idle condition is taken
> from psr1 register(SRD_STATUS) instead of psr2_status
> register, resulting in looping and blank screen.
> code changed to lookup from psr2_status and
> psr2_ctl instead of srd_status and srd_ctl for
> psr2 scenario.
> 
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Cc: Jim Bride <jim.bride at linux.intel.com>
> Signed-off-by: vathsala nagaraju <vathsala.nagaraju at intel.com>

Reviewed-by: Jim Bride <jim.bride at linux.intel.com>

> ---
>  drivers/gpu/drm/i915/i915_reg.h  |  4 ++
>  drivers/gpu/drm/i915/intel_psr.c | 79 +++++++++++++++++++++++++++++-----------
>  2 files changed, 61 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 90685d2..2890bc6 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -3611,6 +3611,10 @@ enum {
>  #define   EDP_PSR2_FRAME_BEFORE_SU_MASK	(0xf<<4)
>  #define   EDP_PSR2_IDLE_MASK		0xf
>  
> +#define EDP_PSR2_STATUS_CTL            _MMIO(0x6f940)
> +#define EDP_PSR2_STATUS_STATE_MASK     (0xf<<28)
> +#define EDP_PSR2_STATUS_STATE_IDLE     0
> +
>  /* VGA port control */
>  #define ADPA			_MMIO(0x61100)
>  #define PCH_ADPA                _MMIO(0xe1100)
> diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
> index d5f8d03..c6bc5dd 100644
> --- a/drivers/gpu/drm/i915/intel_psr.c
> +++ b/drivers/gpu/drm/i915/intel_psr.c
> @@ -397,7 +397,10 @@ static void intel_psr_activate(struct intel_dp *intel_dp)
>  	struct drm_device *dev = intel_dig_port->base.base.dev;
>  	struct drm_i915_private *dev_priv = to_i915(dev);
>  
> -	WARN_ON(I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE);
> +	if (dev_priv->psr.psr2_support)
> +		WARN_ON(I915_READ(EDP_PSR2_CTL) & EDP_PSR2_ENABLE);
> +	else
> +		WARN_ON(I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE);
>  	WARN_ON(dev_priv->psr.active);
>  	lockdep_assert_held(&dev_priv->psr.lock);
>  
> @@ -544,20 +547,37 @@ static void hsw_psr_disable(struct intel_dp *intel_dp)
>  	struct drm_i915_private *dev_priv = to_i915(dev);
>  
>  	if (dev_priv->psr.active) {
> -		I915_WRITE(EDP_PSR_CTL,
> -			   I915_READ(EDP_PSR_CTL) & ~EDP_PSR_ENABLE);
> +		if (dev_priv->psr.psr2_support)
> +			I915_WRITE(EDP_PSR2_CTL,
> +				I915_READ(EDP_PSR2_CTL) &
> +					~(EDP_PSR2_ENABLE |
> +					EDP_SU_TRACK_ENABLE));
> +		else
> +			I915_WRITE(EDP_PSR_CTL,
> +				   I915_READ(EDP_PSR_CTL) & ~EDP_PSR_ENABLE);
>  
>  		/* Wait till PSR is idle */
> -		if (intel_wait_for_register(dev_priv,
> -					    EDP_PSR_STATUS_CTL,
> -					    EDP_PSR_STATUS_STATE_MASK,
> -					    0,
> -					    2000))
> +		if (dev_priv->psr.psr2_support) {
> +			if (intel_wait_for_register(dev_priv,
> +						    EDP_PSR2_STATUS_CTL,
> +						    EDP_PSR2_STATUS_STATE_MASK,
> +						    0,
> +						    2000))
> +			DRM_ERROR("Timed out waiting for PSR2 Idle State\n");
> +		} else {
> +			if (intel_wait_for_register(dev_priv,
> +						    EDP_PSR_STATUS_CTL,
> +						    EDP_PSR_STATUS_STATE_MASK,
> +						    0,
> +						    2000))
>  			DRM_ERROR("Timed out waiting for PSR Idle State\n");
> -
> +		}
>  		dev_priv->psr.active = false;
>  	} else {
> -		WARN_ON(I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE);
> +		if (dev_priv->psr.psr2_support)
> +			WARN_ON(I915_READ(EDP_PSR2_CTL) & EDP_PSR2_ENABLE);
> +		else
> +			WARN_ON(I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE);
>  	}
>  }
>  
> @@ -608,13 +628,24 @@ static void intel_psr_work(struct work_struct *work)
>  	 * and be ready for re-enable.
>  	 */
>  	if (HAS_DDI(dev_priv)) {
> -		if (intel_wait_for_register(dev_priv,
> -					    EDP_PSR_STATUS_CTL,
> -					    EDP_PSR_STATUS_STATE_MASK,
> -					    0,
> -					    50)) {
> -			DRM_ERROR("Timed out waiting for PSR Idle for re-enable\n");
> -			return;
> +		if (dev_priv->psr.psr2_support) {
> +			if (intel_wait_for_register(dev_priv,
> +						EDP_PSR2_STATUS_CTL,
> +						EDP_PSR2_STATUS_STATE_MASK,
> +						0,
> +						50)) {
> +				DRM_ERROR("Timed out waiting for PSR2 Idle for re-enable\n");
> +				return;
> +			}
> +		} else {
> +			if (intel_wait_for_register(dev_priv,
> +						EDP_PSR_STATUS_CTL,
> +						EDP_PSR_STATUS_STATE_MASK,
> +						0,
> +						50)) {
> +				DRM_ERROR("Timed out waiting for PSR Idle for re-enable\n");
> +				return;
> +			}
>  		}
>  	} else {
>  		if (intel_wait_for_register(dev_priv,
> @@ -656,11 +687,15 @@ static void intel_psr_exit(struct drm_i915_private *dev_priv)
>  		return;
>  
>  	if (HAS_DDI(dev_priv)) {
> -		val = I915_READ(EDP_PSR_CTL);
> -
> -		WARN_ON(!(val & EDP_PSR_ENABLE));
> -
> -		I915_WRITE(EDP_PSR_CTL, val & ~EDP_PSR_ENABLE);
> +		if (dev_priv->psr.psr2_support) {
> +			val = I915_READ(EDP_PSR2_CTL);
> +			WARN_ON(!(val & EDP_PSR2_ENABLE));
> +			I915_WRITE(EDP_PSR2_CTL, val & ~EDP_PSR2_ENABLE);
> +		} else {
> +			val = I915_READ(EDP_PSR_CTL);
> +			WARN_ON(!(val & EDP_PSR_ENABLE));
> +			I915_WRITE(EDP_PSR_CTL, val & ~EDP_PSR_ENABLE);
> +		}
>  	} else {
>  		val = I915_READ(VLV_PSRCTL(pipe));
>  
> -- 
> 1.9.1