Re: [PATCH] drm/i915: De-magic the PSR AUX message

From: Jani Nikula <jani.nikula@linux.intel.com>
To: ville.syrjala@linux.intel.com, intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH] drm/i915: De-magic the PSR AUX message
Date: Wed, 10 Sep 2014 16:45:09 +0300	[thread overview]
Message-ID: <871trjegii.fsf@intel.com> (raw)
In-Reply-To: <1410355025-15917-1-git-send-email-ville.syrjala@linux.intel.com>

On Wed, 10 Sep 2014, ville.syrjala@linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> Use pack_aux() to construct the PSR exit DPMS D0 AUX message,
> and use the defines from dp_dp_helper.h to populate the message
> contents.
>
> Cc: Rodrigo Vivi <rodrigo.vivi@gmail.com>
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/i915_reg.h |  2 --
>  drivers/gpu/drm/i915/intel_dp.c | 16 +++++++++++-----
>  2 files changed, 11 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index e4d7607..fb60493 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -2453,9 +2453,7 @@ enum punit_power_well {
>  
>  #define EDP_PSR_AUX_CTL(dev)			(EDP_PSR_BASE(dev) + 0x10)
>  #define EDP_PSR_AUX_DATA1(dev)			(EDP_PSR_BASE(dev) + 0x14)
> -#define   EDP_PSR_DPCD_COMMAND		0x80060000
>  #define EDP_PSR_AUX_DATA2(dev)			(EDP_PSR_BASE(dev) + 0x18)
> -#define   EDP_PSR_DPCD_NORMAL_OPERATION	(1<<24)
>  #define EDP_PSR_AUX_DATA3(dev)			(EDP_PSR_BASE(dev) + 0x1c)
>  #define EDP_PSR_AUX_DATA4(dev)			(EDP_PSR_BASE(dev) + 0x20)
>  #define EDP_PSR_AUX_DATA5(dev)			(EDP_PSR_BASE(dev) + 0x24)
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 81d7681..05bab25 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -225,7 +225,7 @@ intel_dp_mode_valid(struct drm_connector *connector,
>  }
>  
>  static uint32_t
> -pack_aux(uint8_t *src, int src_bytes)
> +pack_aux(const uint8_t *src, int src_bytes)
>  {
>  	int	i;
>  	uint32_t v = 0;
> @@ -1741,8 +1741,14 @@ static void intel_edp_psr_enable_sink(struct intel_dp *intel_dp)
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	uint32_t aux_clock_divider;
>  	int precharge = 0x3;
> -	int msg_size = 5;       /* Header(4) + Message(1) */
>  	bool only_standby = false;
> +	static const uint8_t aux_msg[] = {
> +		[0] = DP_AUX_NATIVE_WRITE << 4,
> +		[1] = DP_SET_POWER >> 8,
> +		[2] = DP_SET_POWER & 0xff,
> +		[3] = 1 - 1,
> +		[4] = DP_SET_POWER_D0,
> +	};
>  
>  	aux_clock_divider = intel_dp->get_aux_clock_divider(intel_dp, 0);
>  
> @@ -1758,11 +1764,11 @@ static void intel_edp_psr_enable_sink(struct intel_dp *intel_dp)
>  				   DP_PSR_ENABLE | DP_PSR_MAIN_LINK_ACTIVE);
>  
>  	/* Setup AUX registers */
> -	I915_WRITE(EDP_PSR_AUX_DATA1(dev), EDP_PSR_DPCD_COMMAND);
> -	I915_WRITE(EDP_PSR_AUX_DATA2(dev), EDP_PSR_DPCD_NORMAL_OPERATION);
> +	I915_WRITE(EDP_PSR_AUX_DATA1(dev), pack_aux(&aux_msg[0], 4));
> +	I915_WRITE(EDP_PSR_AUX_DATA2(dev), pack_aux(&aux_msg[4], 1));
>  	I915_WRITE(EDP_PSR_AUX_CTL(dev),
>  		   DP_AUX_CH_CTL_TIME_OUT_400us |
> -		   (msg_size << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
> +		   (5 << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |

s/5/ARRAY_SIZE(aux_msg)/ ?

>  		   (precharge << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) |
>  		   (aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT));
>  }
> -- 
> 1.8.5.5
>
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-- 
Jani Nikula, Intel Open Source Technology Center
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