Re: [PATCH 13/19] drm/i915: Implement hw state readout and checks for ultrajoiner

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Wed, Sep 11, 2024 at 06:43:43PM +0530, Ankit Nautiyal wrote:
> From: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
> 
> Ultrajoiner mode has some new bits and states to be
> read out from the hw. Lets make changes accordingly.
> 
> v2: Fix checkpatch warnings. (Ankit)
> v3: Add separate functions for computing expected secondary_big/ultrajoiner
> pipes. (Ankit)
> v4: Streamline the helpers for ultrajoiner. (Ville)
> -Add fixup to accommodate PIPED check for ultrajoiner. (Ville)
> -Add more Ultrajoiner drm_WARNs. (Ville)
> 
> Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_display.c  | 91 ++++++++++++++++++-
>  .../gpu/drm/i915/display/intel_vdsc_regs.h    |  3 +
>  2 files changed, 89 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index b66685a9843f..02926a8ef7c5 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -3662,13 +3662,68 @@ static u8 expected_bigjoiner_secondary_pipes(u8 bigjoiner_primary_pipes)
>  	return expected_secondary_pipes(bigjoiner_primary_pipes, 2);
>  }
>  
> +static u8 expected_ultrajoiner_secondary_pipes(u8 ultrajoiner_primary_pipes)
> +{
> +	return expected_secondary_pipes(ultrajoiner_primary_pipes, 4);
> +}
> +
> +static u8 fixup_ultrajoiner_secondary_pipes(u8 ultrajoiner_primary_pipes,
> +					    u8 ultrajoiner_secondary_pipes)
> +{
> +	return ultrajoiner_secondary_pipes | ultrajoiner_primary_pipes << 3;
> +}
> +
> +static
> +bool intel_display_can_use_ultrajoiner(struct intel_display *display)
> +{
> +	struct drm_i915_private *i915 = to_i915(display->drm);
> +
> +	return ((DISPLAY_VER(display) == 14 && IS_DGFX(i915)) ||
> +		DISPLAY_VER(display) > 14);
> +}
> +
> +static void enabled_ultrajoiner_pipes(struct drm_i915_private *i915,
> +				      u8 *primary_pipes, u8 *secondary_pipes)
> +{
> +	struct intel_display *display = to_intel_display(&i915->drm);
> +	struct intel_crtc *crtc;
> +
> +	*primary_pipes = 0;
> +	*secondary_pipes = 0;
> +
> +	if (!intel_display_can_use_ultrajoiner(display))
> +		return;
> +
> +	for_each_intel_crtc_in_pipe_mask(&i915->drm, crtc,
> +					 joiner_pipes(i915)) {
> +		enum intel_display_power_domain power_domain;
> +		enum pipe pipe = crtc->pipe;
> +		intel_wakeref_t wakeref;
> +
> +		power_domain = intel_dsc_power_domain(crtc, (enum transcoder)pipe);
> +		with_intel_display_power_if_enabled(i915, power_domain, wakeref) {
> +			u32 tmp = intel_de_read(i915, ICL_PIPE_DSS_CTL1(pipe));
> +
> +			if (!(tmp & ULTRA_JOINER_ENABLE))
> +				continue;
> +
> +			if (tmp & PRIMARY_ULTRA_JOINER_ENABLE)
> +				*primary_pipes |= BIT(pipe);
> +			else
> +				*secondary_pipes |= BIT(pipe);
> +		}
> +	}
> +}
> +
>  static void enabled_joiner_pipes(struct drm_i915_private *dev_priv,
>  				 u8 *primary_pipes, u8 *secondary_pipes)
>  {
>  	struct intel_display *display = to_intel_display(&dev_priv->drm);
>  	u8 primary_uncompressed_joiner_pipes, primary_bigjoiner_pipes;
> +	u8 primary_ultrajoiner_pipes;
>  	u8 secondary_uncompressed_joiner_pipes, secondary_bigjoiner_pipes;
> -	u8 uncompressed_joiner_pipes, bigjoiner_pipes;
> +	u8 secondary_ultrajoiner_pipes;
> +	u8 uncompressed_joiner_pipes, bigjoiner_pipes, ultrajoiner_pipes;
>  
>  	if (!intel_display_can_use_joiner(display))
>  		return;
> @@ -3685,13 +3740,33 @@ static void enabled_joiner_pipes(struct drm_i915_private *dev_priv,
>  	drm_WARN_ON(display->drm,
>  		    (primary_bigjoiner_pipes & secondary_bigjoiner_pipes) != 0);
>  
> +	enabled_ultrajoiner_pipes(dev_priv, &primary_ultrajoiner_pipes,
> +				  &secondary_ultrajoiner_pipes);
> +	/*
> +	 * For some strange reason the last pipe in the set of four
> +	 * shouldn't have ultrajoiner enable bit set in hardware.
> +	 * Set the bit anyway to make life easier.
> +	 */
> +	drm_WARN_ON(&dev_priv->drm,
> +		    expected_secondary_pipes(primary_ultrajoiner_pipes, 3) !=
> +		    secondary_ultrajoiner_pipes);
> +	secondary_ultrajoiner_pipes =
> +		fixup_ultrajoiner_secondary_pipes(primary_ultrajoiner_pipes,
> +						  secondary_ultrajoiner_pipes);

Did we find out if the spec is right or wrong about this?

> +
> +	drm_WARN_ON(&dev_priv->drm, (primary_ultrajoiner_pipes & secondary_ultrajoiner_pipes) != 0);
> +
>  	uncompressed_joiner_pipes = primary_uncompressed_joiner_pipes |
>  				    secondary_uncompressed_joiner_pipes;
>  	bigjoiner_pipes = primary_bigjoiner_pipes | secondary_bigjoiner_pipes;
> +	ultrajoiner_pipes = primary_ultrajoiner_pipes | secondary_ultrajoiner_pipes;
>  
>  	drm_WARN(display->drm, (uncompressed_joiner_pipes & bigjoiner_pipes) != 0,
>  		 "Uncomressed joiner pipes(%#x) and bigjoiner pipes(%#x) can't intersect\n",
>  		 uncompressed_joiner_pipes, bigjoiner_pipes);
> +	drm_WARN(display->drm, (ultrajoiner_pipes & bigjoiner_pipes) != ultrajoiner_pipes,
> +		 "Ultrajoiner pipes(%#x) should be bigjoiner pipes(%#x)\n",
> +		 ultrajoiner_pipes, bigjoiner_pipes);
>  	drm_WARN(display->drm, secondary_bigjoiner_pipes !=
>  		 expected_bigjoiner_secondary_pipes(primary_bigjoiner_pipes),
>  		 "Wrong secondary bigjoiner pipes(expected %#x, current %#x)\n",
> @@ -3702,10 +3777,16 @@ static void enabled_joiner_pipes(struct drm_i915_private *dev_priv,
>  		 "Wrong secondary uncompressed joiner pipes(expected %#x, current %#x)\n",
>  		 expected_uncompjoiner_secondary_pipes(primary_uncompressed_joiner_pipes),
>  		 secondary_uncompressed_joiner_pipes);
> -
> -	*primary_pipes = primary_uncompressed_joiner_pipes | primary_bigjoiner_pipes;
> -
> -	*secondary_pipes = secondary_uncompressed_joiner_pipes | secondary_bigjoiner_pipes;
> +	drm_WARN(display->drm, secondary_ultrajoiner_pipes !=
> +		 expected_ultrajoiner_secondary_pipes(primary_ultrajoiner_pipes),
> +		 "Wrong secondary ultrajoiner pipes(expected %x, current %x)\n",
> +		 expected_ultrajoiner_secondary_pipes(primary_ultrajoiner_pipes),
> +		 secondary_ultrajoiner_pipes);
> +
> +	*primary_pipes = primary_uncompressed_joiner_pipes | primary_bigjoiner_pipes |
> +			 primary_ultrajoiner_pipes;
> +	*secondary_pipes = secondary_uncompressed_joiner_pipes | secondary_bigjoiner_pipes |
> +			 secondary_ultrajoiner_pipes;
>  
>  	/* Joiner pipes should always be consecutive primary and secondary */
>  	drm_WARN(display->drm, *secondary_pipes != *primary_pipes << 1,
> diff --git a/drivers/gpu/drm/i915/display/intel_vdsc_regs.h b/drivers/gpu/drm/i915/display/intel_vdsc_regs.h
> index f921ad67b587..db07c9775892 100644
> --- a/drivers/gpu/drm/i915/display/intel_vdsc_regs.h
> +++ b/drivers/gpu/drm/i915/display/intel_vdsc_regs.h
> @@ -37,6 +37,9 @@
>  #define  SPLITTER_CONFIGURATION_MASK		REG_GENMASK(26, 25)
>  #define  SPLITTER_CONFIGURATION_2_SEGMENT	REG_FIELD_PREP(SPLITTER_CONFIGURATION_MASK, 0)
>  #define  SPLITTER_CONFIGURATION_4_SEGMENT	REG_FIELD_PREP(SPLITTER_CONFIGURATION_MASK, 1)
> +

spurious newline

> +#define  ULTRA_JOINER_ENABLE			REG_BIT(23)
> +#define  PRIMARY_ULTRA_JOINER_ENABLE		REG_BIT(22)
>  #define  UNCOMPRESSED_JOINER_PRIMARY		(1 << 21)
>  #define  UNCOMPRESSED_JOINER_SECONDARY		(1 << 20)
>  
> -- 
> 2.45.2

-- 
Ville Syrjälä
Intel