Re: [PATCH v5 3/6] drm/i915/display/icl: HW state readout for transcoder port sync config

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

On Thu, Sep 26, 2019 at 05:11:10PM -0700, Manasi Navare wrote:
> After the state is committed, we readout the HW registers and compare
> the HW state with the SW state that we just committed.
> For Transcdoer port sync, we add master_transcoder and the
> salves bitmask to the crtc_state, hence we need to read those during
> the HW state readout to avoid pipe state mismatch.
> 
> v6:
> * Go through both parts of HW readout (Maarten)
> * Add a WARN if the same trans configured as
> master and slave (Ville, Maarten)
> v5:
> * Add return INVALID in defaut case (Maarten)
> v4:
> * Get power domains in master loop for get_config (Ville)
> v3:
> * Add TRANSCODER_D (Maarten)
> * v3 Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> v2:
> * Add Transcoder_D and MISSING_CASE (Maarten)
> 
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> Cc: Matt Roper <matthew.d.roper@intel.com>
> Cc: Jani Nikula <jani.nikula@intel.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_display.c | 69 ++++++++++++++++++++
>  1 file changed, 69 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index af6b8f10f132..6e4af6ded6f0 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -10510,6 +10510,72 @@ static void haswell_get_ddi_port_state(struct intel_crtc *crtc,
>  	}
>  }
>  
> +static enum transcoder transcoder_master(struct drm_i915_private *dev_priv,
> +					 enum transcoder cpu_transcoder)
> +{
> +	u32 trans_port_sync, master_select;
> +
> +	trans_port_sync = I915_READ(TRANS_DDI_FUNC_CTL2(cpu_transcoder));
> +
> +	if ((trans_port_sync & PORT_SYNC_MODE_ENABLE) == 0)
> +		return INVALID_TRANSCODER;
> +
> +	master_select = trans_port_sync &
> +			PORT_SYNC_MODE_MASTER_SELECT_MASK;
> +	switch (master_select) {
> +	case 1:
> +		return TRANSCODER_A;
> +	case 2:
> +		return TRANSCODER_B;
> +	case 3:
> +		return TRANSCODER_C;
> +	case 4:
> +		return TRANSCODER_D;

Missing EDP. Also A-D are just master_select-1

> +	default:
> +		MISSING_CASE(master_select);
> +		return INVALID_TRANSCODER;
> +	}
> +}
> +
> +static void icelake_get_trans_port_sync_config(struct intel_crtc *crtc,
> +					       struct intel_crtc_state *pipe_config)

s/pipe_config/crtc_state/

'crtc' argument can be derived so doesn't need to be passed in.

> +{
> +	struct drm_device *dev = crtc->base.dev;
> +	struct drm_i915_private *dev_priv = to_i915(dev);
> +	u32 transcoders;
> +	enum transcoder cpu_transcoder;
> +
> +	pipe_config->master_transcoder = transcoder_master(dev_priv,
> +							   pipe_config->cpu_transcoder);
> +	if (pipe_config->master_transcoder != INVALID_TRANSCODER)
> +		pipe_config->sync_mode_slaves_mask = 0;

Zeroing seems redundant.

> +
> +	transcoders = BIT(TRANSCODER_A) |
> +		BIT(TRANSCODER_B) |
> +		BIT(TRANSCODER_C) |
> +		BIT(TRANSCODER_D);
> +	for_each_cpu_transcoder_masked(dev_priv, cpu_transcoder, transcoders) {
> +		enum intel_display_power_domain power_domain;
> +		intel_wakeref_t trans_wakeref;
> +
> +		power_domain = POWER_DOMAIN_TRANSCODER(cpu_transcoder);
> +		trans_wakeref = intel_display_power_get_if_enabled(dev_priv,
> +								   power_domain);
> +
> +		if (!trans_wakeref)
> +			continue;
> +
> +		if (transcoder_master(dev_priv, cpu_transcoder) ==
> +		    pipe_config->cpu_transcoder)
> +			pipe_config->sync_mode_slaves_mask |= BIT(cpu_transcoder);
> +
> +		intel_display_power_put(dev_priv, power_domain, trans_wakeref);
> +	}
> +
> +	WARN_ON(pipe_config->master_transcoder != INVALID_TRANSCODER &&
> +		pipe_config->sync_mode_slaves_mask);
> +}
> +
>  static bool haswell_get_pipe_config(struct intel_crtc *crtc,
>  				    struct intel_crtc_state *pipe_config)
>  {
> @@ -10629,6 +10695,9 @@ static bool haswell_get_pipe_config(struct intel_crtc *crtc,
>  		pipe_config->pixel_multiplier = 1;
>  	}
>  
> +	if (INTEL_GEN(dev_priv) >= 11)
> +		icelake_get_trans_port_sync_config(crtc, pipe_config);
> +
>  out:
>  	for_each_power_domain(power_domain, power_domain_mask)
>  		intel_display_power_put(dev_priv,
> -- 
> 2.19.1

-- 
Ville Syrjälä
Intel
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