Re: [PATCH 2/8] drm/i915/psr: Do not set MASK_DISP_REG_WRITE in ICL

From: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
To: intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH 2/8] drm/i915/psr: Do not set MASK_DISP_REG_WRITE in ICL
Date: Mon, 24 Sep 2018 17:16:47 -0700	[thread overview]
Message-ID: <21978065.jFvdTOnX1F@dk-thinkpad-x260> (raw)
In-Reply-To: <20180920204327.3513-2-jose.souza@intel.com>

On Thursday, September 20, 2018 1:43:21 PM PDT José Roberto de Souza wrote:
> ICL spec states that this bit is now reserved.

It reads better if you state the bit name and register in the commit message. 
With this nit addressed,
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> 
> Spec: 7722
Change this to  Bspec: 7722 to be clear? But, I don't know if there is a tag 
that we consistently use for citing bspec.

> 
> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h  |  4 ++--
>  drivers/gpu/drm/i915/intel_psr.c | 17 +++++++++++------
>  2 files changed, 13 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h
> b/drivers/gpu/drm/i915/i915_reg.h index 4948b352bf4c..4dd5290a3b95 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -4195,7 +4195,7 @@ enum {
>  #define   EDP_PSR_DEBUG_MASK_LPSP              (1 << 27)
>  #define   EDP_PSR_DEBUG_MASK_MEMUP             (1 << 26)
>  #define   EDP_PSR_DEBUG_MASK_HPD               (1 << 25)
> -#define   EDP_PSR_DEBUG_MASK_DISP_REG_WRITE    (1 << 16)
> +#define   EDP_PSR_DEBUG_MASK_DISP_REG_WRITE    (1 << 16) /* Reserved in
> ICL+ */ #define   EDP_PSR_DEBUG_EXIT_ON_PIXEL_UNDERRUN (1 << 15) /* SKL+ */
> 
>  #define EDP_PSR2_CTL			_MMIO(0x6f900)
> @@ -4232,7 +4232,7 @@ enum {
>  #define  PSR_EVENT_FRONT_BUFFER_MODIFY		(1 << 9)
>  #define  PSR_EVENT_WD_TIMER_EXPIRE		(1 << 8)
>  #define  PSR_EVENT_PIPE_REGISTERS_UPDATE	(1 << 6)
> -#define  PSR_EVENT_REGISTER_UPDATE		(1 << 5)
> +#define  PSR_EVENT_REGISTER_UPDATE		(1 << 5) /* Reserved in ICL+ */
>  #define  PSR_EVENT_HDCP_ENABLE			(1 << 4)
>  #define  PSR_EVENT_KVMR_SESSION_ENABLE		(1 << 3)
>  #define  PSR_EVENT_VBI_ENABLE			(1 << 2)
> diff --git a/drivers/gpu/drm/i915/intel_psr.c
> b/drivers/gpu/drm/i915/intel_psr.c index 358bbcd3b5f3..6f3c6f0c539f 100644
> --- a/drivers/gpu/drm/i915/intel_psr.c
> +++ b/drivers/gpu/drm/i915/intel_psr.c
> @@ -558,6 +558,7 @@ static void intel_psr_enable_source(struct intel_dp
> *intel_dp, {
>  	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
>  	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
> +	u32 mask;
> 
>  	/* Only HSW and BDW have PSR AUX registers that need to be setup. SKL+
>  	 * use hardcoded values PSR AUX transactions
> @@ -583,12 +584,16 @@ static void intel_psr_enable_source(struct intel_dp
> *intel_dp, * runtime_pm besides preventing  other hw tracking issues now we
> * can rely on frontbuffer tracking.
>  	 */
> -	I915_WRITE(EDP_PSR_DEBUG,
> -		   EDP_PSR_DEBUG_MASK_MEMUP |
> -		   EDP_PSR_DEBUG_MASK_HPD |
> -		   EDP_PSR_DEBUG_MASK_LPSP |
> -		   EDP_PSR_DEBUG_MASK_DISP_REG_WRITE |
> -		   EDP_PSR_DEBUG_MASK_MAX_SLEEP);
> +	mask = EDP_PSR_DEBUG_MASK_MEMUP |
> +	       EDP_PSR_DEBUG_MASK_HPD |
> +	       EDP_PSR_DEBUG_MASK_LPSP |
> +	       EDP_PSR_DEBUG_MASK_DISP_REG_WRITE |
> +	       EDP_PSR_DEBUG_MASK_MAX_SLEEP;
> +
> +	if (INTEL_GEN(dev_priv) >= 11)
> +		mask &= ~EDP_PSR_DEBUG_MASK_DISP_REG_WRITE;
> +
> +	I915_WRITE(EDP_PSR_DEBUG, mask);
>  }
> 
>  static void intel_psr_enable_locked(struct drm_i915_private *dev_priv,


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