[PATCH] drm/i915/pps: split intel_pps_reset_all() to vlv and bxt variants

[Ville Syrjälä]

On Thu, Sep 19, 2024 at 12:04:27PM +0300, Jani Nikula wrote:
> The intel_pps_reset_all() function does similar but not quite the same
> things for VLV/CHV and BXT/GLK. Observe that it's called from platform
> specific code only, and a split to two functions vlv_pps_reset_all() and
> bxt_pps_reset_all() is natural.
> 
> Remove the platform checks and warnings from the functions. We don't
> usually have them, unless we're unsure. To make this easier to reason
> about for BXT/GLK, change the condition on caller side from "!PCH" to
> "BXT || GLK".
> 
> Suggested-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Signed-off-by: Jani Nikula <jani.nikula at intel.com>

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> ---
>  .../i915/display/intel_display_power_well.c   | 11 +++---
>  drivers/gpu/drm/i915/display/intel_pps.c      | 34 +++++++++++--------
>  drivers/gpu/drm/i915/display/intel_pps.h      |  3 +-
>  3 files changed, 27 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display_power_well.c b/drivers/gpu/drm/i915/display/intel_display_power_well.c
> index 1898aff50ac4..adaf7cf3a33b 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_power_well.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_power_well.c
> @@ -879,12 +879,11 @@ void bxt_enable_dc9(struct intel_display *display)
>  
>  	drm_dbg_kms(display->drm, "Enabling DC9\n");
>  	/*
> -	 * Power sequencer reset is not needed on
> -	 * platforms with South Display Engine on PCH,
> -	 * because PPS registers are always on.
> +	 * Power sequencer reset is needed on BXT/GLK, because the PPS registers
> +	 * aren't always on, unlike with South Display Engine on PCH.
>  	 */
> -	if (!HAS_PCH_SPLIT(dev_priv))
> -		intel_pps_reset_all(display);
> +	if (IS_BROXTON(dev_priv) || IS_GEMINILAKE(dev_priv))
> +		bxt_pps_reset_all(display);
>  	gen9_set_dc_state(display, DC_STATE_EN_DC9);
>  }
>  
> @@ -1270,7 +1269,7 @@ static void vlv_display_power_well_deinit(struct drm_i915_private *dev_priv)
>  	/* make sure we're done processing display irqs */
>  	intel_synchronize_irq(dev_priv);
>  
> -	intel_pps_reset_all(display);
> +	vlv_pps_reset_all(display);
>  
>  	/* Prevent us from re-enabling polling on accident in late suspend */
>  	if (!dev_priv->drm.dev->power.is_suspended)
> diff --git a/drivers/gpu/drm/i915/display/intel_pps.c b/drivers/gpu/drm/i915/display/intel_pps.c
> index 819b2843946f..88abc4c7cda1 100644
> --- a/drivers/gpu/drm/i915/display/intel_pps.c
> +++ b/drivers/gpu/drm/i915/display/intel_pps.c
> @@ -70,7 +70,7 @@ intel_wakeref_t intel_pps_lock(struct intel_dp *intel_dp)
>  	intel_wakeref_t wakeref;
>  
>  	/*
> -	 * See intel_pps_reset_all() why we need a power domain reference here.
> +	 * See vlv_pps_reset_all() why we need a power domain reference here.
>  	 */
>  	wakeref = intel_display_power_get(dev_priv, POWER_DOMAIN_DISPLAY_CORE);
>  	mutex_lock(&display->pps.mutex);
> @@ -448,14 +448,10 @@ pps_initial_setup(struct intel_dp *intel_dp)
>  	return intel_pps_is_valid(intel_dp);
>  }
>  
> -void intel_pps_reset_all(struct intel_display *display)
> +void vlv_pps_reset_all(struct intel_display *display)
>  {
> -	struct drm_i915_private *dev_priv = to_i915(display->drm);
>  	struct intel_encoder *encoder;
>  
> -	if (drm_WARN_ON(display->drm, !IS_LP(dev_priv)))
> -		return;
> -
>  	if (!HAS_DISPLAY(display))
>  		return;
>  
> @@ -472,16 +468,26 @@ void intel_pps_reset_all(struct intel_display *display)
>  	for_each_intel_dp(display->drm, encoder) {
>  		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
>  
> -		if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
> -			drm_WARN_ON(display->drm,
> -				    intel_dp->pps.vlv_active_pipe != INVALID_PIPE);
> -
> -		if (encoder->type != INTEL_OUTPUT_EDP)
> -			continue;
> +		drm_WARN_ON(display->drm, intel_dp->pps.vlv_active_pipe != INVALID_PIPE);
>  
> -		if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
> +		if (encoder->type == INTEL_OUTPUT_EDP)
>  			intel_dp->pps.vlv_pps_pipe = INVALID_PIPE;
> -		else
> +	}
> +}
> +
> +void bxt_pps_reset_all(struct intel_display *display)
> +{
> +	struct intel_encoder *encoder;
> +
> +	if (!HAS_DISPLAY(display))
> +		return;
> +
> +	/* See vlv_pps_reset_all() for why we can't grab pps_mutex here. */
> +
> +	for_each_intel_dp(display->drm, encoder) {
> +		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> +
> +		if (encoder->type == INTEL_OUTPUT_EDP)
>  			intel_dp->pps.bxt_pps_reset = true;
>  	}
>  }
> diff --git a/drivers/gpu/drm/i915/display/intel_pps.h b/drivers/gpu/drm/i915/display/intel_pps.h
> index a5339a65485d..bc5046d53626 100644
> --- a/drivers/gpu/drm/i915/display/intel_pps.h
> +++ b/drivers/gpu/drm/i915/display/intel_pps.h
> @@ -43,7 +43,6 @@ void intel_pps_wait_power_cycle(struct intel_dp *intel_dp);
>  bool intel_pps_init(struct intel_dp *intel_dp);
>  void intel_pps_init_late(struct intel_dp *intel_dp);
>  void intel_pps_encoder_reset(struct intel_dp *intel_dp);
> -void intel_pps_reset_all(struct intel_display *display);
>  
>  void vlv_pps_pipe_init(struct intel_dp *intel_dp);
>  void vlv_pps_pipe_reset(struct intel_dp *intel_dp);
> @@ -52,6 +51,8 @@ void vlv_pps_port_enable_unlocked(struct intel_encoder *encoder,
>  				  const struct intel_crtc_state *crtc_state);
>  void vlv_pps_port_disable(struct intel_encoder *encoder,
>  			  const struct intel_crtc_state *crtc_state);
> +void vlv_pps_reset_all(struct intel_display *display);
> +void bxt_pps_reset_all(struct intel_display *display);
>  
>  void intel_pps_unlock_regs_wa(struct intel_display *display);
>  void intel_pps_setup(struct intel_display *display);
> -- 
> 2.39.2

-- 
Ville Syrjälä
Intel