[Intel-gfx] [RFC 4/5] drm/i915/panelreplay: enable/disable panel replay

[Souza, Jose]

On Wed, 2021-09-08 at 14:45 +0530, Animesh Manna wrote:
> TRANS_DP2_CTL register is programmed to enable panel replay from source
> and sink is enabled through panel replay dpcd configuration address.
> 
> Signed-off-by: Animesh Manna <animesh.manna at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_psr.c | 30 ++++++++++++++++++++----
>  drivers/gpu/drm/i915/i915_reg.h          |  1 +
>  include/drm/drm_dp_helper.h              |  3 +++
>  3 files changed, 29 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
> index 660e19c10aa8..1dc6b340d745 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -369,8 +369,12 @@ static void intel_psr_enable_sink(struct intel_dp *intel_dp)
>  	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
>  	u8 dpcd_val = DP_PSR_ENABLE;
>  
> -	/* Enable ALPM at sink for psr2 */
> -	if (intel_dp->psr.psr2_enabled) {
> +	if (intel_dp->psr.pr_enabled) {
> +		drm_dp_dpcd_writeb(&intel_dp->aux, PANEL_REPLAY_CONFIG,
> +				   PANEL_REPLAY_ENABLE);
> +		return;

If you are sure no other dpcd write is needed better separate this if + return from the other


if (intel_dp->psr.pr_enabled) {
	...
	return;
}

if (intel_dp->psr.psr2_enabled) {
	....
} else {
	...
}

....

> +	} else if (intel_dp->psr.psr2_enabled) {
> +		/* Enable ALPM at sink for psr2 */
>  		drm_dp_dpcd_writeb(&intel_dp->aux, DP_RECEIVER_ALPM_CONFIG,
>  				   DP_ALPM_ENABLE |
>  				   DP_ALPM_LOCK_ERROR_IRQ_HPD_ENABLE);
> @@ -497,6 +501,17 @@ static u32 intel_psr2_get_tp_time(struct intel_dp *intel_dp)
>  	return val;
>  }
>  
> +static void dg2_activate_panel_replay(struct intel_dp *intel_dp)
> +{
> +	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> +
> +	intel_de_write(dev_priv, PSR2_MAN_TRK_CTL(intel_dp->psr.transcoder),
> +		       ADLP_PSR2_MAN_TRK_CTL_SF_PARTIAL_FRAME_UPDATE);
> +
> +	intel_de_rmw(dev_priv, TRANS_DP2_CTL(intel_dp->psr.transcoder), 0,
> +		     TRANS_DP2_PANEL_REPLAY_ENABLE);

PSR2 is not supported in DG2 and I would believe that is the case for panel relay.

> +}
> +
>  static void hsw_activate_psr2(struct intel_dp *intel_dp)
>  {
>  	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> @@ -1077,8 +1092,10 @@ static void intel_psr_activate(struct intel_dp *intel_dp)
>  	drm_WARN_ON(&dev_priv->drm, intel_dp->psr.active);
>  	lockdep_assert_held(&intel_dp->psr.lock);
>  
> -	/* psr1 and psr2 are mutually exclusive.*/
> -	if (intel_dp->psr.psr2_enabled)
> +	/* psr1, psr2 and panel-replay are mutually exclusive.*/
> +	if (intel_dp->psr.pr_enabled)
> +		dg2_activate_panel_replay(intel_dp);
> +	else if (intel_dp->psr.psr2_enabled)
>  		hsw_activate_psr2(intel_dp);
>  	else
>  		hsw_activate_psr1(intel_dp);
> @@ -1267,7 +1284,10 @@ static void intel_psr_exit(struct intel_dp *intel_dp)
>  		return;
>  	}
>  
> -	if (intel_dp->psr.psr2_enabled) {
> +	if (intel_dp->psr.pr_enabled) {
> +		intel_de_rmw(dev_priv, TRANS_DP2_CTL(intel_dp->psr.transcoder),
> +			     TRANS_DP2_PANEL_REPLAY_ENABLE, 0);
> +	} else if (intel_dp->psr.psr2_enabled) {
>  		tgl_disallow_dc3co_on_psr2_exit(intel_dp);
>  		val = intel_de_read(dev_priv,
>  				    EDP_PSR2_CTL(intel_dp->psr.transcoder));
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 5bc8f22fa9a8..9effbc6e5539 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -4720,6 +4720,7 @@ enum {
>  #define  PSR2_MAN_TRK_CTL_SF_SINGLE_FULL_FRAME			REG_BIT(3)
>  #define  PSR2_MAN_TRK_CTL_SF_CONTINUOS_FULL_FRAME		REG_BIT(2)
>  #define  PSR2_MAN_TRK_CTL_SF_PARTIAL_FRAME_UPDATE		REG_BIT(1)
> +#define  ADLP_PSR2_MAN_TRK_CTL_SF_PARTIAL_FRAME_UPDATE		REG_BIT(31)
>  #define  ADLP_PSR2_MAN_TRK_CTL_SU_REGION_START_ADDR_MASK	REG_GENMASK(28, 16)
>  #define  ADLP_PSR2_MAN_TRK_CTL_SU_REGION_START_ADDR(val)	REG_FIELD_PREP(ADLP_PSR2_MAN_TRK_CTL_SU_REGION_START_ADDR_MASK, val)
>  #define  ADLP_PSR2_MAN_TRK_CTL_SU_REGION_END_ADDR_MASK		REG_GENMASK(12, 0)
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index 1b4dcee3b281..63face4e4f6f 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -707,6 +707,9 @@ struct drm_panel;
>  #define DP_BRANCH_DEVICE_CTRL		    0x1a1
>  # define DP_BRANCH_DEVICE_IRQ_HPD	    (1 << 0)
>  
> +#define PANEL_REPLAY_CONFIG                 0x1b0
> +# define PANEL_REPLAY_ENABLE                (1 << 0)
> +
>  #define DP_PAYLOAD_ALLOCATE_SET		    0x1c0
>  #define DP_PAYLOAD_ALLOCATE_START_TIME_SLOT 0x1c1
>  #define DP_PAYLOAD_ALLOCATE_TIME_SLOT_COUNT 0x1c2