[Intel-gfx] [PATCH v3 09/10] drm/i915/psr: Set DPCD PSR2 enable bit when needed

[Rodrigo Vivi]

On Wed, Mar 28, 2018 at 03:30:45PM -0700, José Roberto de Souza wrote:
> In the 2 eDP1.4a pannels tested set or not set bit have no effect
> but is better set it and comply with specification.
> 
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>

patches 1-9 pushed to dinq. Thanks for patches and reviews.

> ---
> 
> v3: rebased
> 
>  drivers/gpu/drm/i915/intel_psr.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
> index d079cf0b034c..2d53f7398a6d 100644
> --- a/drivers/gpu/drm/i915/intel_psr.c
> +++ b/drivers/gpu/drm/i915/intel_psr.c
> @@ -278,18 +278,19 @@ static void hsw_psr_enable_sink(struct intel_dp *intel_dp)
>  	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
>  	struct drm_device *dev = dig_port->base.base.dev;
>  	struct drm_i915_private *dev_priv = to_i915(dev);
> +	u8 dpcd_val = DP_PSR_ENABLE;
>  
>  	/* Enable ALPM at sink for psr2 */
>  	if (dev_priv->psr.psr2_enabled && dev_priv->psr.alpm)
>  		drm_dp_dpcd_writeb(&intel_dp->aux,
>  				DP_RECEIVER_ALPM_CONFIG,
>  				DP_ALPM_ENABLE);
> +
> +	if (dev_priv->psr.psr2_enabled)
> +		dpcd_val |= DP_PSR_ENABLE_PSR2;
>  	if (dev_priv->psr.link_standby)
> -		drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG,
> -				   DP_PSR_ENABLE | DP_PSR_MAIN_LINK_ACTIVE);
> -	else
> -		drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG,
> -				   DP_PSR_ENABLE);
> +		dpcd_val |= DP_PSR_MAIN_LINK_ACTIVE;
> +	drm_dp_dpcd_writeb(&intel_dp->aux, DP_PSR_EN_CFG, dpcd_val);
>  
>  	drm_dp_dpcd_writeb(&intel_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
>  }
> -- 
> 2.16.3
> 
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