Re: [PATCH 2/2] drm/i915/psr: Set frames before SU entry for psr2

From: Rodrigo Vivi <rodrigo.vivi@intel.com>
To: vathsala nagaraju <vathsala.nagaraju@intel.com>
Cc: Puthikorn Voravootivat <puthik@chromium.org>,
	intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org
Subject: Re: [PATCH 2/2] drm/i915/psr: Set frames before SU entry for psr2
Date: Fri, 22 Sep 2017 16:54:02 -0700	[thread overview]
Message-ID: <20170922235402.3gkcxlobbp5by2x7@intel.com> (raw)
In-Reply-To: <1506095916-20250-1-git-send-email-vathsala.nagaraju@intel.com>

On Fri, Sep 22, 2017 at 03:58:36PM +0000, vathsala nagaraju wrote:
> Set frames before SU entry value for max resync frame count of
> dpcd register 2009, bit field 0:3.
> 
> v2 :
>  - add macro  EDP_PSR2_FRAME_BEFORE_SU (Rodrigo)
>  - remove EDP_FRAMES_BEFORE_SU_ENTRY (Rodrigo)
>  - add check ==1 for dpcd_read call (ville)
> 
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> CC: Puthikorn Voravootivat <puthik@chromium.org>
> Signed-off-by: Vathsala Nagaraju <vathsala.nagaraju@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h  |  2 +-
>  drivers/gpu/drm/i915/intel_psr.c | 12 ++++++++++--
>  2 files changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 82f36dd..89c5249 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -170,6 +170,7 @@ static inline bool i915_mmio_reg_valid(i915_reg_t reg)
>  	(mask) << 16 | (value); })
>  #define _MASKED_BIT_ENABLE(a)	({ typeof(a) _a = (a); _MASKED_FIELD(_a, _a); })
>  #define _MASKED_BIT_DISABLE(a)	(_MASKED_FIELD((a), 0))
> +#define EDP_PSR2_FRAME_BEFORE_SU(a) ((a) << EDP_PSR2_FRAME_BEFORE_SU_SHIFT)

not here

>  
>  /* Engine ID */
>  
> @@ -4047,7 +4048,6 @@ enum {
>  #define   EDP_PSR2_FRAME_BEFORE_SU_SHIFT 4
>  #define   EDP_PSR2_FRAME_BEFORE_SU_MASK	(0xf<<4)
>  #define   EDP_PSR2_IDLE_MASK		0xf
> -#define   EDP_FRAMES_BEFORE_SU_ENTRY   (1<<4)

move here

>  
>  #define EDP_PSR2_STATUS_CTL            _MMIO(0x6f940)
>  #define EDP_PSR2_STATUS_STATE_MASK     (0xf<<28)
> diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
> index 0a17d1f..e505fa6 100644
> --- a/drivers/gpu/drm/i915/intel_psr.c
> +++ b/drivers/gpu/drm/i915/intel_psr.c
> @@ -327,6 +327,7 @@ static void hsw_activate_psr2(struct intel_dp *intel_dp)
>  	 */
>  	uint32_t idle_frames = max(6, dev_priv->vbt.psr.idle_frames);
>  	uint32_t val;
> +	uint8_t sink_latency;
>  
>  	val = idle_frames << EDP_PSR_IDLE_FRAME_SHIFT;
>  
> @@ -334,8 +335,15 @@ static void hsw_activate_psr2(struct intel_dp *intel_dp)
>  	 * mesh at all with our frontbuffer tracking. And the hw alone isn't
>  	 * good enough. */
>  	val |= EDP_PSR2_ENABLE |
> -		EDP_SU_TRACK_ENABLE |
> -		EDP_FRAMES_BEFORE_SU_ENTRY;
> +		EDP_SU_TRACK_ENABLE;
> +
> +	if (drm_dp_dpcd_readb(&intel_dp->aux, DP_SINK_SYNCHRONIZATION_LATENCY,
> +				&sink_latency) == 1) {
> +		sink_latency = sink_latency & DP_MAX_RESYNC_FRAME_CNT_MASK;

		sink_latency &= DP_MAX_RESYNC_FRAME_CNT_MASK;

with those changes

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>


> +	} else {
> +		sink_latency = 0;
> +	}
> +	val |= EDP_PSR2_FRAME_BEFORE_SU(sink_latency + 1);
>  
>  	if (dev_priv->vbt.psr.tp2_tp3_wakeup_time > 5)
>  		val |= EDP_PSR2_TP2_TIME_2500;
> -- 
> 1.9.1
> 
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