Re: [PATCH 08/14] drm/i915: Implement hw state readout and checks for ultrajoiner

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

On Fri, Sep 06, 2024 at 06:28:01PM +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)
> 
> 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  | 133 ++++++++++++++----
>  .../gpu/drm/i915/display/intel_vdsc_regs.h    |   3 +
>  2 files changed, 108 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 6f098383479f..1243e4b24acc 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -3638,17 +3638,63 @@ static void enabled_bigjoiner_pipes(struct drm_i915_private *dev_priv,
>  	}
>  }
>  
> -static u8 expected_secondary_pipes(u8 primary_pipes)
> +static void enabled_ultrajoiner_pipes(struct drm_i915_private *i915,
> +				      u8 *primary_pipes, u8 *secondary_pipes)
>  {
> +	struct intel_crtc *crtc;
> +
> +	*primary_pipes = 0;
> +	*secondary_pipes = 0;
> +
> +	if (DISPLAY_VER(i915) < 14)
> +		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 u8 expected_secondary_bigjoiner_pipes(u8 primary_pipes)
> +{
> +	if (!primary_pipes)
> +		return 0;
> +
>  	return primary_pipes << 1;

What is "0 << 1"?

>  }
>  
> +static u8 expected_secondary_ultrajoiner_pipes(u8 primary_pipes)
> +{
> +	if (!primary_pipes)
> +		return 0;
> +
> +	return GENMASK(2, primary_pipes);

That looks like nonsense.

Looks like I had some ideas how to do these in a generic fashion:
https://lore.kernel.org/intel-gfx/ZoMA2T5qTKB7wdwl@intel.com/

> +}
> +
>  static void enabled_joiner_pipes(struct drm_i915_private *dev_priv,
> -				 u8 *primary_pipes, u8 *secondary_pipes)
> +				 u8 *primary_pipes, u8 *secondary_pipes,
> +				 bool *ultrajoiner_used)
>  {
>  	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;
>  
>  	enabled_uncompressed_joiner_pipes(dev_priv, &primary_uncompressed_joiner_pipes,
>  					  &secondary_uncompressed_joiner_pipes);
> @@ -3656,33 +3702,50 @@ static void enabled_joiner_pipes(struct drm_i915_private *dev_priv,
>  	enabled_bigjoiner_pipes(dev_priv, &primary_bigjoiner_pipes,
>  				&secondary_bigjoiner_pipes);
>  
> +	enabled_ultrajoiner_pipes(dev_priv, &primary_ultrajoiner_pipes,
> +				  &secondary_ultrajoiner_pipes);
> +
>  	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;
> +	*ultrajoiner_used = ultrajoiner_pipes != 0;
>  
>  	drm_WARN(&dev_priv->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(&dev_priv->drm, (ultrajoiner_pipes & bigjoiner_pipes) != ultrajoiner_pipes,
> +		 "Ultrajoiner pipes(%x) should be bigjoiner pipes(%x)\n",
> +		 ultrajoiner_pipes, bigjoiner_pipes);
> +
>  	drm_WARN(&dev_priv->drm, secondary_bigjoiner_pipes !=
> -		 expected_secondary_pipes(primary_bigjoiner_pipes),
> +		 expected_secondary_bigjoiner_pipes(primary_bigjoiner_pipes),
>  		 "Wrong secondary bigjoiner pipes(expected %x, current %x)\n",
> -		 expected_secondary_pipes(primary_bigjoiner_pipes),
> +		 expected_secondary_bigjoiner_pipes(primary_bigjoiner_pipes),
>  		 secondary_bigjoiner_pipes);
>  	drm_WARN(&dev_priv->drm, secondary_uncompressed_joiner_pipes !=
> -		 expected_secondary_pipes(primary_uncompressed_joiner_pipes),
> +		 expected_secondary_bigjoiner_pipes(primary_uncompressed_joiner_pipes),
>  		 "Wrong secondary uncompressed joiner pipes(expected %x, current %x)\n",
> -		 expected_secondary_pipes(primary_uncompressed_joiner_pipes),
> +		 expected_secondary_bigjoiner_pipes(primary_uncompressed_joiner_pipes),
>  		 secondary_uncompressed_joiner_pipes);
> +	drm_WARN(&dev_priv->drm, secondary_ultrajoiner_pipes !=
> +		 expected_secondary_ultrajoiner_pipes(primary_ultrajoiner_pipes),
> +		 "Wrong secondary ultrajoiner pipes(expected %x, current %x)\n",
> +		 expected_secondary_ultrajoiner_pipes(primary_ultrajoiner_pipes),
> +		 secondary_ultrajoiner_pipes);
>  
>  	*primary_pipes = 0;
>  	*secondary_pipes = 0;
>  
> -	*primary_pipes = primary_uncompressed_joiner_pipes | primary_bigjoiner_pipes;
> +	*primary_pipes = primary_uncompressed_joiner_pipes | primary_bigjoiner_pipes |
> +			 primary_ultrajoiner_pipes;
>  
> -	*secondary_pipes = secondary_uncompressed_joiner_pipes | secondary_bigjoiner_pipes;
> +	*secondary_pipes = secondary_uncompressed_joiner_pipes | secondary_bigjoiner_pipes |
> +			 secondary_ultrajoiner_pipes;
>  }
>  
> -static enum pipe get_joiner_primary_pipe(enum pipe pipe, u8 primary_pipes, u8 secondary_pipes)
> +static enum pipe get_joiner_primary_pipe(enum pipe pipe, u8 primary_pipes,
> +					 u8 secondary_pipes, bool ultrajoiner_used)
>  {
>  	if ((secondary_pipes & BIT(pipe)) == 0)
>  		return pipe;
> @@ -3690,27 +3753,37 @@ static enum pipe get_joiner_primary_pipe(enum pipe pipe, u8 primary_pipes, u8 se
>  	/* ignore everything above our pipe */
>  	primary_pipes &= ~GENMASK(7, pipe);
>  
> -	/* highest remaining bit should be our primary pipe */
> -	return fls(primary_pipes) - 1;
> +	if (!ultrajoiner_used)
> +		/* highest remaining bit should be our master pipe */
> +		return fls(primary_pipes) - 1;
> +
> +	/* lowest remaining bit should be our primary master pipe */
> +	return ffs(primary_pipes) - 1;
>  }
>  
> -static u8 get_joiner_secondary_pipes(enum pipe pipe, u8 primary_pipes, u8 secondary_pipes)
> +static u8 get_joiner_secondary_pipes(enum pipe pipe, u8 primary_pipes,
> +				     u8 secondary_pipes, bool ultrajoiner_used)
>  {
>  	enum pipe primary_pipe, next_primary_pipe;
>  
> -	primary_pipe = get_joiner_primary_pipe(pipe, primary_pipes, secondary_pipes);
> +	primary_pipe = get_joiner_primary_pipe(pipe, primary_pipes,
> +					       secondary_pipes, ultrajoiner_used);
>  
>  	if ((primary_pipes & BIT(primary_pipe)) == 0)
>  		return 0;
>  
> -	/* ignore our primary pipe and everything below it */
> -	primary_pipes &= ~GENMASK(primary_pipe, 0);
> -	/* make sure a high bit is set for the ffs() */
> -	primary_pipes |= BIT(7);
> -	/* lowest remaining bit should be the next primary pipe */
> -	next_primary_pipe = ffs(primary_pipes) - 1;
> +	if (!ultrajoiner_used) {
> +		/* ignore our primary pipe and everything below it */
> +		primary_pipes &= ~GENMASK(primary_pipe, 0);
> +		/* make sure a high bit is set for the ffs() */
> +		primary_pipes |= BIT(7);
> +		/* lowest remaining bit should be the next primary pipe */
> +		next_primary_pipe = ffs(primary_pipes) - 1;
>  
> -	return secondary_pipes & GENMASK(next_primary_pipe - 1, primary_pipe);
> +		return secondary_pipes & GENMASK(next_primary_pipe - 1, primary_pipe);
> +	} else {
> +		return (secondary_pipes | primary_pipes) & ~BIT(primary_pipe);
> +	}

There are far too many things happening in this one patch.
Needs to be split into sensible parts.

>  }
>  
>  static u8 hsw_panel_transcoders(struct drm_i915_private *i915)
> @@ -3731,6 +3804,7 @@ static u8 hsw_enabled_transcoders(struct intel_crtc *crtc)
>  	enum transcoder cpu_transcoder;
>  	u8 primary_pipes, secondary_pipes;
>  	u8 enabled_transcoders = 0;
> +	bool ultrajoiner_used;
>  
>  	/*
>  	 * XXX: Do intel_display_power_get_if_enabled before reading this (for
> @@ -3781,11 +3855,12 @@ static u8 hsw_enabled_transcoders(struct intel_crtc *crtc)
>  	if (transcoder_ddi_func_is_enabled(dev_priv, cpu_transcoder))
>  		enabled_transcoders |= BIT(cpu_transcoder);
>  
> -	/* joiner secondary -> consider the primary pipe's transcoder as well */
> -	enabled_joiner_pipes(dev_priv, &primary_pipes, &secondary_pipes);
> +	/* joiner slave -> consider the master pipe's transcoder as well */
> +	enabled_joiner_pipes(dev_priv, &primary_pipes, &secondary_pipes, &ultrajoiner_used);
>  	if (secondary_pipes & BIT(crtc->pipe)) {
>  		cpu_transcoder = (enum transcoder)
> -			get_joiner_primary_pipe(crtc->pipe, primary_pipes, secondary_pipes);
> +			get_joiner_primary_pipe(crtc->pipe, primary_pipes,
> +						secondary_pipes, ultrajoiner_used);
>  		if (transcoder_ddi_func_is_enabled(dev_priv, cpu_transcoder))
>  			enabled_transcoders |= BIT(cpu_transcoder);
>  	}
> @@ -3917,16 +3992,18 @@ static void intel_joiner_get_config(struct intel_crtc_state *crtc_state)
>  	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
>  	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
>  	u8 primary_pipes, secondary_pipes;
> +	bool ultrajoiner_used;
>  	enum pipe pipe = crtc->pipe;
>  
> -	enabled_joiner_pipes(i915, &primary_pipes, &secondary_pipes);
> +	enabled_joiner_pipes(i915, &primary_pipes, &secondary_pipes, &ultrajoiner_used);
>  
>  	if (((primary_pipes | secondary_pipes) & BIT(pipe)) == 0)
>  		return;
>  
> -	crtc_state->joiner_pipes =
> -		BIT(get_joiner_primary_pipe(pipe, primary_pipes, secondary_pipes)) |
> -		get_joiner_secondary_pipes(pipe, primary_pipes, secondary_pipes);
> +	crtc_state->joiner_pipes = BIT(get_joiner_primary_pipe(pipe, primary_pipes,
> +							       secondary_pipes, ultrajoiner_used)) |
> +				   get_joiner_secondary_pipes(pipe, primary_pipes,
> +							      secondary_pipes, ultrajoiner_used);
>  }
>  
>  static bool hsw_get_pipe_config(struct intel_crtc *crtc,
> 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)
> +
> +#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