Re: [Intel-gfx] [RFC v2 3/8] drm/i915: Keep track of pwm-related backlight hooks separately

[Rodrigo Vivi <rodrigo.vivi@intel.com>]

On Wed, Sep 16, 2020 at 01:18:50PM -0400, Lyude Paul wrote:
> Currently, every different type of backlight hook that i915 supports is
> pretty straight forward - you have a backlight, probably through PWM
> (but maybe DPCD), with a single set of platform-specific hooks that are
> used for controlling it.
> 
> HDR backlights, in particular VESA and Intel's HDR backlight
> implementations, can end up being more complicated. With Intel's
> proprietary interface, HDR backlight controls always run through the
> DPCD. When the backlight is in SDR backlight mode however, the driver
> may need to bypass the TCON and control the backlight directly through
> PWM.
> 
> So, in order to support this we'll need to split our backlight callbacks
> into two groups: a set of high-level backlight control callbacks in
> intel_panel, and an additional set of pwm-specific backlight control
> callbacks. This also implies a functional changes for how these
> callbacks are used:
> 
> * We now keep track of two separate backlight level ranges, one for the
>   high-level backlight, and one for the pwm backlight range
> * We also keep track of backlight enablement and PWM backlight
>   enablement separately
> * Since the currently set backlight level might not be the same as the
>   currently programmed PWM backlight level, we stop setting
>   panel->backlight.level with the currently programmed PWM backlight
>   level in panel->backlight.pwm_funcs.setup(). Instead, we rely
>   on the higher level backlight control functions to retrieve the
>   current PWM backlight level (in this case, intel_pwm_get_backlight()).
>   Note that there are still a few PWM backlight setup callbacks that
>   do actually need to retrieve the current PWM backlight level, although
>   we no longer save this value in panel->backlight.level like before.
> * panel->backlight.pwm_funcs.enable()/disable() both accept a PWM
>   brightness level, unlike their siblings
>   panel->backlight.enable()/disable(). This is so we can calculate the
>   actual PWM brightness level we want to set on disable/enable in the
>   higher level backlight enable()/disable() functions, since this value
>   might be scaled from a brightness level that doesn't come from PWM.
> 
> Signed-off-by: Lyude Paul <lyude@redhat.com>
> Cc: thaytan@noraisin.net
> Cc: Vasily Khoruzhick <anarsoul@gmail.com>
> ---
>  .../drm/i915/display/intel_display_types.h    |  14 +-
>  drivers/gpu/drm/i915/display/intel_panel.c    | 436 ++++++++++--------
>  2 files changed, 246 insertions(+), 204 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> index b2d0edacc58c9..52a6543df842a 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -221,6 +221,9 @@ struct intel_panel {
>  		bool alternate_pwm_increment;	/* lpt+ */
>  
>  		/* PWM chip */
> +		u32 pwm_min;
> +		u32 pwm_max;
> +		bool pwm_enabled;
>  		bool util_pin_active_low;	/* bxt+ */
>  		u8 controller;		/* bxt+ only */
>  		struct pwm_device *pwm;
> @@ -229,6 +232,16 @@ struct intel_panel {
>  		/* DPCD backlight */
>  		u8 pwmgen_bit_count;
>  
> +		struct {
> +			int (*setup)(struct intel_connector *connector, enum pipe pipe);
> +			u32 (*get)(struct intel_connector *connector);
> +			void (*set)(const struct drm_connector_state *conn_state, u32 level);
> +			void (*disable)(const struct drm_connector_state *conn_state, u32 level);
> +			void (*enable)(const struct intel_crtc_state *crtc_state,
> +				       const struct drm_connector_state *conn_state, u32 level);
> +			u32 (*hz_to_pwm)(struct intel_connector *connector, u32 hz);
> +		} pwm_funcs;
> +
>  		struct backlight_device *device;
>  
>  		/* Connector and platform specific backlight functions */
> @@ -238,7 +251,6 @@ struct intel_panel {
>  		void (*disable)(const struct drm_connector_state *conn_state);
>  		void (*enable)(const struct intel_crtc_state *crtc_state,
>  			       const struct drm_connector_state *conn_state);
> -		u32 (*hz_to_pwm)(struct intel_connector *connector, u32 hz);

I see my poor brain getting confused with these 2 levels with very similar function sets
with same name.
But I currently have no suggestion for better organization or names...

>  		void (*power)(struct intel_connector *, bool enable);
>  	} backlight;
>  };
> diff --git a/drivers/gpu/drm/i915/display/intel_panel.c b/drivers/gpu/drm/i915/display/intel_panel.c
> index c0e36244bb07d..6d3e9d51d069c 100644
> --- a/drivers/gpu/drm/i915/display/intel_panel.c
> +++ b/drivers/gpu/drm/i915/display/intel_panel.c
> @@ -511,25 +511,34 @@ static u32 scale_hw_to_user(struct intel_connector *connector,
>  		     0, user_max);
>  }
>  
> -static u32 intel_panel_compute_brightness(struct intel_connector *connector,
> -					  u32 val)
> +static u32 intel_panel_sanitize_pwm_level(struct intel_connector *connector, u32 val)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
>  	struct intel_panel *panel = &connector->panel;
>  
> -	drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
> +	drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_max == 0);
>  
>  	if (dev_priv->params.invert_brightness < 0)
>  		return val;
>  
>  	if (dev_priv->params.invert_brightness > 0 ||
>  	    dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
> -		return panel->backlight.max - val + panel->backlight.min;
> +		return panel->backlight.pwm_max - val + panel->backlight.pwm_min;
>  	}
>  
>  	return val;
>  }
>  
> +static void intel_panel_set_pwm_level(const struct drm_connector_state *conn_state, u32 val)
> +{
> +	struct intel_connector *connector = to_intel_connector(conn_state->connector);
> +	struct drm_i915_private *i915 = to_i915(connector->base.dev);
> +	struct intel_panel *panel = &connector->panel;
> +
> +	drm_dbg_kms(&i915->drm, "set backlight PWM = %d\n", val);
> +	panel->backlight.pwm_funcs.set(conn_state, val);
> +}
> +
>  static u32 lpt_get_backlight(struct intel_connector *connector)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> @@ -624,12 +633,12 @@ static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32
>  	struct intel_panel *panel = &connector->panel;
>  	u32 tmp, mask;
>  
> -	drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
> +	drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_max == 0);
>  
>  	if (panel->backlight.combination_mode) {
>  		u8 lbpc;
>  
> -		lbpc = level * 0xfe / panel->backlight.max + 1;
> +		lbpc = level * 0xfe / panel->backlight.pwm_max + 1;
>  		level /= lbpc;
>  		pci_write_config_byte(dev_priv->drm.pdev, LBPC, lbpc);
>  	}
> @@ -681,9 +690,8 @@ intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state,
>  	struct drm_i915_private *i915 = to_i915(connector->base.dev);
>  	struct intel_panel *panel = &connector->panel;
>  
> -	drm_dbg_kms(&i915->drm, "set backlight PWM = %d\n", level);
> +	drm_dbg_kms(&i915->drm, "set backlight level = %d\n", level);
>  
> -	level = intel_panel_compute_brightness(connector, level);
>  	panel->backlight.set(conn_state, level);
>  }
>  
> @@ -726,13 +734,13 @@ void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state
>  	mutex_unlock(&dev_priv->backlight_lock);
>  }
>  
> -static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state)
> +static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
>  {
>  	struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
>  	u32 tmp;
>  
> -	intel_panel_actually_set_backlight(old_conn_state, 0);
> +	intel_panel_set_pwm_level(old_conn_state, level);
>  
>  	/*
>  	 * Although we don't support or enable CPU PWM with LPT/SPT based
> @@ -754,13 +762,13 @@ static void lpt_disable_backlight(const struct drm_connector_state *old_conn_sta
>  	intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
>  }
>  
> -static void pch_disable_backlight(const struct drm_connector_state *old_conn_state)
> +static void pch_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
>  {
>  	struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
>  	u32 tmp;
>  
> -	intel_panel_actually_set_backlight(old_conn_state, 0);
> +	intel_panel_set_pwm_level(old_conn_state, val);
>  
>  	tmp = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
>  	intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
> @@ -769,44 +777,44 @@ static void pch_disable_backlight(const struct drm_connector_state *old_conn_sta
>  	intel_de_write(dev_priv, BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
>  }
>  
> -static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state)
> +static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
>  {
> -	intel_panel_actually_set_backlight(old_conn_state, 0);
> +	intel_panel_set_pwm_level(old_conn_state, val);
>  }
>  
> -static void i965_disable_backlight(const struct drm_connector_state *old_conn_state)
> +static void i965_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev);
>  	u32 tmp;
>  
> -	intel_panel_actually_set_backlight(old_conn_state, 0);
> +	intel_panel_set_pwm_level(old_conn_state, val);
>  
>  	tmp = intel_de_read(dev_priv, BLC_PWM_CTL2);
>  	intel_de_write(dev_priv, BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
>  }
>  
> -static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state)
> +static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
>  {
>  	struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
>  	enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
>  	u32 tmp;
>  
> -	intel_panel_actually_set_backlight(old_conn_state, 0);
> +	intel_panel_set_pwm_level(old_conn_state, val);
>  
>  	tmp = intel_de_read(dev_priv, VLV_BLC_PWM_CTL2(pipe));
>  	intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe),
>  		       tmp & ~BLM_PWM_ENABLE);
>  }
>  
> -static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state)
> +static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
>  {
>  	struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
>  	struct intel_panel *panel = &connector->panel;
> -	u32 tmp, val;
> +	u32 tmp;
>  
> -	intel_panel_actually_set_backlight(old_conn_state, 0);
> +	intel_panel_set_pwm_level(old_conn_state, val);
>  
>  	tmp = intel_de_read(dev_priv,
>  			    BXT_BLC_PWM_CTL(panel->backlight.controller));
> @@ -820,14 +828,14 @@ static void bxt_disable_backlight(const struct drm_connector_state *old_conn_sta
>  	}
>  }
>  
> -static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state)
> +static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
>  {
>  	struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
>  	struct intel_panel *panel = &connector->panel;
>  	u32 tmp;
>  
> -	intel_panel_actually_set_backlight(old_conn_state, 0);
> +	intel_panel_set_pwm_level(old_conn_state, val);
>  
>  	tmp = intel_de_read(dev_priv,
>  			    BXT_BLC_PWM_CTL(panel->backlight.controller));
> @@ -835,7 +843,7 @@ static void cnp_disable_backlight(const struct drm_connector_state *old_conn_sta
>  		       tmp & ~BXT_BLC_PWM_ENABLE);
>  }
>  
> -static void ext_pwm_disable_backlight(const struct drm_connector_state *old_conn_state)
> +static void ext_pwm_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
>  {
>  	struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
>  	struct intel_panel *panel = &connector->panel;
> @@ -876,7 +884,7 @@ void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_st
>  }
>  
>  static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
> -				 const struct drm_connector_state *conn_state)
> +				 const struct drm_connector_state *conn_state, u32 level)
>  {
>  	struct intel_connector *connector = to_intel_connector(conn_state->connector);
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> @@ -906,7 +914,7 @@ static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
>  		intel_de_write(dev_priv, SOUTH_CHICKEN1, schicken);
>  	}
>  
> -	pch_ctl2 = panel->backlight.max << 16;
> +	pch_ctl2 = panel->backlight.pwm_max << 16;
>  	intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2);
>  
>  	pch_ctl1 = 0;
> @@ -923,11 +931,11 @@ static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
>  		       pch_ctl1 | BLM_PCH_PWM_ENABLE);
>  
>  	/* This won't stick until the above enable. */
> -	intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
> +	intel_panel_set_pwm_level(conn_state, level);
>  }
>  
>  static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
> -				 const struct drm_connector_state *conn_state)
> +				 const struct drm_connector_state *conn_state, u32 level)
>  {
>  	struct intel_connector *connector = to_intel_connector(conn_state->connector);
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> @@ -958,9 +966,9 @@ static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
>  	intel_de_write(dev_priv, BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
>  
>  	/* This won't stick until the above enable. */
> -	intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
> +	intel_panel_set_pwm_level(conn_state, level);
>  
> -	pch_ctl2 = panel->backlight.max << 16;
> +	pch_ctl2 = panel->backlight.pwm_max << 16;
>  	intel_de_write(dev_priv, BLC_PWM_PCH_CTL2, pch_ctl2);
>  
>  	pch_ctl1 = 0;
> @@ -974,7 +982,7 @@ static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
>  }
>  
>  static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
> -				  const struct drm_connector_state *conn_state)
> +				  const struct drm_connector_state *conn_state, u32 level)
>  {
>  	struct intel_connector *connector = to_intel_connector(conn_state->connector);
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> @@ -987,7 +995,7 @@ static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
>  		intel_de_write(dev_priv, BLC_PWM_CTL, 0);
>  	}
>  
> -	freq = panel->backlight.max;
> +	freq = panel->backlight.pwm_max;
>  	if (panel->backlight.combination_mode)
>  		freq /= 0xff;
>  
> @@ -1001,7 +1009,7 @@ static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
>  	intel_de_posting_read(dev_priv, BLC_PWM_CTL);
>  
>  	/* XXX: combine this into above write? */
> -	intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
> +	intel_panel_set_pwm_level(conn_state, level);
>  
>  	/*
>  	 * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
> @@ -1013,7 +1021,7 @@ static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
>  }
>  
>  static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
> -				  const struct drm_connector_state *conn_state)
> +				  const struct drm_connector_state *conn_state, u32 level)
>  {
>  	struct intel_connector *connector = to_intel_connector(conn_state->connector);
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> @@ -1028,7 +1036,7 @@ static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
>  		intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2);
>  	}
>  
> -	freq = panel->backlight.max;
> +	freq = panel->backlight.pwm_max;
>  	if (panel->backlight.combination_mode)
>  		freq /= 0xff;
>  
> @@ -1044,11 +1052,11 @@ static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
>  	intel_de_posting_read(dev_priv, BLC_PWM_CTL2);
>  	intel_de_write(dev_priv, BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
>  
> -	intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
> +	intel_panel_set_pwm_level(conn_state, level);
>  }
>  
>  static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
> -				 const struct drm_connector_state *conn_state)
> +				 const struct drm_connector_state *conn_state, u32 level)
>  {
>  	struct intel_connector *connector = to_intel_connector(conn_state->connector);
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> @@ -1063,11 +1071,11 @@ static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
>  		intel_de_write(dev_priv, VLV_BLC_PWM_CTL2(pipe), ctl2);
>  	}
>  
> -	ctl = panel->backlight.max << 16;
> +	ctl = panel->backlight.pwm_max << 16;
>  	intel_de_write(dev_priv, VLV_BLC_PWM_CTL(pipe), ctl);
>  
>  	/* XXX: combine this into above write? */
> -	intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
> +	intel_panel_set_pwm_level(conn_state, level);
>  
>  	ctl2 = 0;
>  	if (panel->backlight.active_low_pwm)
> @@ -1079,7 +1087,7 @@ static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
>  }
>  
>  static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
> -				 const struct drm_connector_state *conn_state)
> +				 const struct drm_connector_state *conn_state, u32 level)
>  {
>  	struct intel_connector *connector = to_intel_connector(conn_state->connector);
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> @@ -1116,9 +1124,9 @@ static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
>  
>  	intel_de_write(dev_priv,
>  		       BXT_BLC_PWM_FREQ(panel->backlight.controller),
> -		       panel->backlight.max);
> +		       panel->backlight.pwm_max);
>  
> -	intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
> +	intel_panel_set_pwm_level(conn_state, level);
>  
>  	pwm_ctl = 0;
>  	if (panel->backlight.active_low_pwm)
> @@ -1133,7 +1141,7 @@ static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
>  }
>  
>  static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
> -				 const struct drm_connector_state *conn_state)
> +				 const struct drm_connector_state *conn_state, u32 level)
>  {
>  	struct intel_connector *connector = to_intel_connector(conn_state->connector);
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> @@ -1152,9 +1160,9 @@ static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
>  
>  	intel_de_write(dev_priv,
>  		       BXT_BLC_PWM_FREQ(panel->backlight.controller),
> -		       panel->backlight.max);
> +		       panel->backlight.pwm_max);
>  
> -	intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
> +	intel_panel_set_pwm_level(conn_state, level);
>  
>  	pwm_ctl = 0;
>  	if (panel->backlight.active_low_pwm)
> @@ -1169,13 +1177,11 @@ static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
>  }
>  
>  static void ext_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
> -				     const struct drm_connector_state *conn_state)
> +				     const struct drm_connector_state *conn_state, u32 level)
>  {
>  	struct intel_connector *connector = to_intel_connector(conn_state->connector);
>  	struct intel_panel *panel = &connector->panel;
> -	int level = panel->backlight.level;
>  
> -	level = intel_panel_compute_brightness(connector, level);
>  	pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
>  	panel->backlight.pwm_state.enabled = true;
>  	pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state);
> @@ -1233,10 +1239,8 @@ static u32 intel_panel_get_backlight(struct intel_connector *connector)
>  
>  	mutex_lock(&dev_priv->backlight_lock);
>  
> -	if (panel->backlight.enabled) {
> +	if (panel->backlight.enabled)
>  		val = panel->backlight.get(connector);
> -		val = intel_panel_compute_brightness(connector, val);
> -	}
>  
>  	mutex_unlock(&dev_priv->backlight_lock);
>  
> @@ -1567,13 +1571,13 @@ static u32 get_backlight_max_vbt(struct intel_connector *connector)
>  	u16 pwm_freq_hz = get_vbt_pwm_freq(dev_priv);
>  	u32 pwm;
>  
> -	if (!panel->backlight.hz_to_pwm) {
> +	if (!panel->backlight.pwm_funcs.hz_to_pwm) {
>  		drm_dbg_kms(&dev_priv->drm,
>  			    "backlight frequency conversion not supported\n");
>  		return 0;
>  	}
>  
> -	pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
> +	pwm = panel->backlight.pwm_funcs.hz_to_pwm(connector, pwm_freq_hz);
>  	if (!pwm) {
>  		drm_dbg_kms(&dev_priv->drm,
>  			    "backlight frequency conversion failed\n");
> @@ -1592,7 +1596,7 @@ static u32 get_backlight_min_vbt(struct intel_connector *connector)
>  	struct intel_panel *panel = &connector->panel;
>  	int min;
>  
> -	drm_WARN_ON(&dev_priv->drm, panel->backlight.max == 0);
> +	drm_WARN_ON(&dev_priv->drm, panel->backlight.pwm_max == 0);
>  
>  	/*
>  	 * XXX: If the vbt value is 255, it makes min equal to max, which leads
> @@ -1609,7 +1613,7 @@ static u32 get_backlight_min_vbt(struct intel_connector *connector)
>  	}
>  
>  	/* vbt value is a coefficient in range [0..255] */
> -	return scale(min, 0, 255, 0, panel->backlight.max);
> +	return scale(min, 0, 255, 0, panel->backlight.pwm_max);
>  }
>  
>  static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unused)
> @@ -1629,37 +1633,32 @@ static int lpt_setup_backlight(struct intel_connector *connector, enum pipe unus
>  	panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
>  
>  	pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2);
> -	panel->backlight.max = pch_ctl2 >> 16;
> +	panel->backlight.pwm_max = pch_ctl2 >> 16;
>  
>  	cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
>  
> -	if (!panel->backlight.max)
> -		panel->backlight.max = get_backlight_max_vbt(connector);
> +	if (!panel->backlight.pwm_max)
> +		panel->backlight.pwm_max = get_backlight_max_vbt(connector);
>  
> -	if (!panel->backlight.max)
> +	if (!panel->backlight.pwm_max)
>  		return -ENODEV;
>  
> -	panel->backlight.min = get_backlight_min_vbt(connector);
> +	panel->backlight.pwm_min = get_backlight_min_vbt(connector);
>  
> -	panel->backlight.enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
> +	panel->backlight.pwm_enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
>  
> -	cpu_mode = panel->backlight.enabled && HAS_PCH_LPT(dev_priv) &&
> +	cpu_mode = panel->backlight.pwm_enabled && HAS_PCH_LPT(dev_priv) &&
>  		   !(pch_ctl1 & BLM_PCH_OVERRIDE_ENABLE) &&
>  		   (cpu_ctl2 & BLM_PWM_ENABLE);
> -	if (cpu_mode)
> -		val = pch_get_backlight(connector);
> -	else
> -		val = lpt_get_backlight(connector);
> -	val = intel_panel_compute_brightness(connector, val);
> -	panel->backlight.level = clamp(val, panel->backlight.min,
> -				       panel->backlight.max);
>  
>  	if (cpu_mode) {
> +		val = intel_panel_sanitize_pwm_level(connector, pch_get_backlight(connector));
> +
>  		drm_dbg_kms(&dev_priv->drm,
>  			    "CPU backlight register was enabled, switching to PCH override\n");
>  
>  		/* Write converted CPU PWM value to PCH override register */
> -		lpt_set_backlight(connector->base.state, panel->backlight.level);
> +		lpt_set_backlight(connector->base.state, val);
>  		intel_de_write(dev_priv, BLC_PWM_PCH_CTL1,
>  			       pch_ctl1 | BLM_PCH_OVERRIDE_ENABLE);
>  
> @@ -1674,29 +1673,24 @@ static int pch_setup_backlight(struct intel_connector *connector, enum pipe unus
>  {
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
>  	struct intel_panel *panel = &connector->panel;
> -	u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
> +	u32 cpu_ctl2, pch_ctl1, pch_ctl2;
>  
>  	pch_ctl1 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL1);
>  	panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
>  
>  	pch_ctl2 = intel_de_read(dev_priv, BLC_PWM_PCH_CTL2);
> -	panel->backlight.max = pch_ctl2 >> 16;
> +	panel->backlight.pwm_max = pch_ctl2 >> 16;
>  
> -	if (!panel->backlight.max)
> -		panel->backlight.max = get_backlight_max_vbt(connector);
> +	if (!panel->backlight.pwm_max)
> +		panel->backlight.pwm_max = get_backlight_max_vbt(connector);
>  
> -	if (!panel->backlight.max)
> +	if (!panel->backlight.pwm_max)
>  		return -ENODEV;
>  
> -	panel->backlight.min = get_backlight_min_vbt(connector);
> -
> -	val = pch_get_backlight(connector);
> -	val = intel_panel_compute_brightness(connector, val);
> -	panel->backlight.level = clamp(val, panel->backlight.min,
> -				       panel->backlight.max);
> +	panel->backlight.pwm_min = get_backlight_min_vbt(connector);
>  
>  	cpu_ctl2 = intel_de_read(dev_priv, BLC_PWM_CPU_CTL2);
> -	panel->backlight.enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
> +	panel->backlight.pwm_enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
>  		(pch_ctl1 & BLM_PCH_PWM_ENABLE);
>  
>  	return 0;
> @@ -1716,27 +1710,26 @@ static int i9xx_setup_backlight(struct intel_connector *connector, enum pipe unu
>  	if (IS_PINEVIEW(dev_priv))
>  		panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
>  
> -	panel->backlight.max = ctl >> 17;
> +	panel->backlight.pwm_max = ctl >> 17;
>  
> -	if (!panel->backlight.max) {
> -		panel->backlight.max = get_backlight_max_vbt(connector);
> -		panel->backlight.max >>= 1;
> +	if (!panel->backlight.pwm_max) {
> +		panel->backlight.pwm_max = get_backlight_max_vbt(connector);
> +		panel->backlight.pwm_max >>= 1;
>  	}
>  
> -	if (!panel->backlight.max)
> +	if (!panel->backlight.pwm_max)
>  		return -ENODEV;
>  
>  	if (panel->backlight.combination_mode)
> -		panel->backlight.max *= 0xff;
> +		panel->backlight.pwm_max *= 0xff;
>  
> -	panel->backlight.min = get_backlight_min_vbt(connector);
> +	panel->backlight.pwm_min = get_backlight_min_vbt(connector);
>  
>  	val = i9xx_get_backlight(connector);
> -	val = intel_panel_compute_brightness(connector, val);
> -	panel->backlight.level = clamp(val, panel->backlight.min,
> -				       panel->backlight.max);
> +	val = intel_panel_sanitize_pwm_level(connector, val);
> +	val = clamp(val, panel->backlight.pwm_min, panel->backlight.pwm_max);
>  
> -	panel->backlight.enabled = val != 0;
> +	panel->backlight.pwm_enabled = val != 0;
>  
>  	return 0;
>  }
> @@ -1745,32 +1738,27 @@ static int i965_setup_backlight(struct intel_connector *connector, enum pipe unu
>  {
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
>  	struct intel_panel *panel = &connector->panel;
> -	u32 ctl, ctl2, val;
> +	u32 ctl, ctl2;
>  
>  	ctl2 = intel_de_read(dev_priv, BLC_PWM_CTL2);
>  	panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
>  	panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
>  
>  	ctl = intel_de_read(dev_priv, BLC_PWM_CTL);
> -	panel->backlight.max = ctl >> 16;
> +	panel->backlight.pwm_max = ctl >> 16;
>  
> -	if (!panel->backlight.max)
> -		panel->backlight.max = get_backlight_max_vbt(connector);
> +	if (!panel->backlight.pwm_max)
> +		panel->backlight.pwm_max = get_backlight_max_vbt(connector);
>  
> -	if (!panel->backlight.max)
> +	if (!panel->backlight.pwm_max)
>  		return -ENODEV;
>  
>  	if (panel->backlight.combination_mode)
> -		panel->backlight.max *= 0xff;
> +		panel->backlight.pwm_max *= 0xff;
>  
> -	panel->backlight.min = get_backlight_min_vbt(connector);
> +	panel->backlight.pwm_min = get_backlight_min_vbt(connector);
>  
> -	val = i9xx_get_backlight(connector);
> -	val = intel_panel_compute_brightness(connector, val);
> -	panel->backlight.level = clamp(val, panel->backlight.min,
> -				       panel->backlight.max);
> -
> -	panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
> +	panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
>  
>  	return 0;
>  }
> @@ -1779,7 +1767,7 @@ static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe
>  {
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
>  	struct intel_panel *panel = &connector->panel;
> -	u32 ctl, ctl2, val;
> +	u32 ctl, ctl2;
>  
>  	if (drm_WARN_ON(&dev_priv->drm, pipe != PIPE_A && pipe != PIPE_B))
>  		return -ENODEV;
> @@ -1788,22 +1776,17 @@ static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe
>  	panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
>  
>  	ctl = intel_de_read(dev_priv, VLV_BLC_PWM_CTL(pipe));
> -	panel->backlight.max = ctl >> 16;
> +	panel->backlight.pwm_max = ctl >> 16;
>  
> -	if (!panel->backlight.max)
> -		panel->backlight.max = get_backlight_max_vbt(connector);
> +	if (!panel->backlight.pwm_max)
> +		panel->backlight.pwm_max = get_backlight_max_vbt(connector);
>  
> -	if (!panel->backlight.max)
> +	if (!panel->backlight.pwm_max)
>  		return -ENODEV;
>  
> -	panel->backlight.min = get_backlight_min_vbt(connector);
> +	panel->backlight.pwm_min = get_backlight_min_vbt(connector);
>  
> -	val = _vlv_get_backlight(dev_priv, pipe);
> -	val = intel_panel_compute_brightness(connector, val);
> -	panel->backlight.level = clamp(val, panel->backlight.min,
> -				       panel->backlight.max);
> -
> -	panel->backlight.enabled = ctl2 & BLM_PWM_ENABLE;
> +	panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
>  
>  	return 0;
>  }
> @@ -1828,24 +1811,18 @@ bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
>  	}
>  
>  	panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
> -	panel->backlight.max =
> -		intel_de_read(dev_priv,
> -			      BXT_BLC_PWM_FREQ(panel->backlight.controller));
> +	panel->backlight.pwm_max = intel_de_read(dev_priv,
> +						 BXT_BLC_PWM_FREQ(panel->backlight.controller));
>  
> -	if (!panel->backlight.max)
> -		panel->backlight.max = get_backlight_max_vbt(connector);
> +	if (!panel->backlight.pwm_max)
> +		panel->backlight.pwm_max = get_backlight_max_vbt(connector);
>  
> -	if (!panel->backlight.max)
> +	if (!panel->backlight.pwm_max)
>  		return -ENODEV;
>  
> -	panel->backlight.min = get_backlight_min_vbt(connector);
> -
> -	val = bxt_get_backlight(connector);
> -	val = intel_panel_compute_brightness(connector, val);
> -	panel->backlight.level = clamp(val, panel->backlight.min,
> -				       panel->backlight.max);
> +	panel->backlight.pwm_min = get_backlight_min_vbt(connector);
>  
> -	panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
> +	panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
>  
>  	return 0;
>  }
> @@ -1855,7 +1832,7 @@ cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
>  	struct intel_panel *panel = &connector->panel;
> -	u32 pwm_ctl, val;
> +	u32 pwm_ctl;
>  
>  	/*
>  	 * CNP has the BXT implementation of backlight, but with only one
> @@ -1868,24 +1845,18 @@ cnp_setup_backlight(struct intel_connector *connector, enum pipe unused)
>  				BXT_BLC_PWM_CTL(panel->backlight.controller));
>  
>  	panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
> -	panel->backlight.max =
> -		intel_de_read(dev_priv,
> -			      BXT_BLC_PWM_FREQ(panel->backlight.controller));
> +	panel->backlight.pwm_max = intel_de_read(dev_priv,
> +						 BXT_BLC_PWM_FREQ(panel->backlight.controller));
>  
> -	if (!panel->backlight.max)
> -		panel->backlight.max = get_backlight_max_vbt(connector);
> +	if (!panel->backlight.pwm_max)
> +		panel->backlight.pwm_max = get_backlight_max_vbt(connector);
>  
> -	if (!panel->backlight.max)
> +	if (!panel->backlight.pwm_max)
>  		return -ENODEV;
>  
> -	panel->backlight.min = get_backlight_min_vbt(connector);
> -
> -	val = bxt_get_backlight(connector);
> -	val = intel_panel_compute_brightness(connector, val);
> -	panel->backlight.level = clamp(val, panel->backlight.min,
> -				       panel->backlight.max);
> +	panel->backlight.pwm_min = get_backlight_min_vbt(connector);
>  
> -	panel->backlight.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
> +	panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
>  
>  	return 0;
>  }
> @@ -1915,8 +1886,8 @@ static int ext_pwm_setup_backlight(struct intel_connector *connector,
>  		return -ENODEV;
>  	}
>  
> -	panel->backlight.max = 100; /* 100% */
> -	panel->backlight.min = get_backlight_min_vbt(connector);
> +	panel->backlight.pwm_max = 100; /* 100% */
> +	panel->backlight.pwm_min = get_backlight_min_vbt(connector);
>  
>  	if (pwm_is_enabled(panel->backlight.pwm)) {
>  		/* PWM is already enabled, use existing settings */
> @@ -1924,10 +1895,8 @@ static int ext_pwm_setup_backlight(struct intel_connector *connector,
>  
>  		level = pwm_get_relative_duty_cycle(&panel->backlight.pwm_state,
>  						    100);
> -		level = intel_panel_compute_brightness(connector, level);
> -		panel->backlight.level = clamp(level, panel->backlight.min,
> -					       panel->backlight.max);
> -		panel->backlight.enabled = true;
> +		level = intel_panel_sanitize_pwm_level(connector, level);
> +		panel->backlight.pwm_enabled = true;
>  
>  		drm_dbg_kms(&dev_priv->drm, "PWM already enabled at freq %ld, VBT freq %d, level %d\n",
>  			    NSEC_PER_SEC / (unsigned long)panel->backlight.pwm_state.period,
> @@ -1943,6 +1912,60 @@ static int ext_pwm_setup_backlight(struct intel_connector *connector,
>  	return 0;
>  }
>  
> +static void intel_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
> +{
> +	struct intel_connector *connector = to_intel_connector(conn_state->connector);
> +	struct intel_panel *panel = &connector->panel;
> +
> +	panel->backlight.pwm_funcs.set(conn_state,
> +				       intel_panel_sanitize_pwm_level(connector, level));
> +}
> +
> +static u32 intel_pwm_get_backlight(struct intel_connector *connector)
> +{
> +	struct intel_panel *panel = &connector->panel;
> +
> +	return intel_panel_sanitize_pwm_level(connector, panel->backlight.pwm_funcs.get(connector));
> +}
> +
> +static void intel_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
> +				       const struct drm_connector_state *conn_state)
> +{
> +	struct intel_connector *connector = to_intel_connector(conn_state->connector);
> +	struct intel_panel *panel = &connector->panel;
> +	u32 level = intel_panel_sanitize_pwm_level(connector, panel->backlight.level);
> +
> +	panel->backlight.pwm_funcs.enable(crtc_state, conn_state, level);
> +}
> +
> +static void intel_pwm_disable_backlight(const struct drm_connector_state *conn_state)
> +{
> +	struct intel_connector *connector = to_intel_connector(conn_state->connector);
> +	struct intel_panel *panel = &connector->panel;
> +
> +	panel->backlight.pwm_funcs.disable(conn_state,
> +					   intel_panel_sanitize_pwm_level(connector, 0));
> +}
> +
> +/* The only hook PWM-only backlight setups need to override, the rest of the hooks are filled in
> + * from pwm_funcs
> + */
> +static int intel_pwm_setup_backlight(struct intel_connector *connector, enum pipe pipe)
> +{
> +	struct intel_panel *panel = &connector->panel;
> +	int ret = panel->backlight.pwm_funcs.setup(connector, pipe);
> +
> +	if (ret < 0)
> +		return ret;
> +
> +	panel->backlight.min = panel->backlight.pwm_min;
> +	panel->backlight.max = panel->backlight.pwm_max;
> +	panel->backlight.level = panel->backlight.get(connector);
> +	panel->backlight.enabled = panel->backlight.pwm_enabled;
> +
> +	return 0;
> +}
> +
>  void intel_panel_update_backlight(struct intel_atomic_state *state,
>  				  struct intel_encoder *encoder,
>  				  const struct intel_crtc_state *crtc_state,
> @@ -2024,75 +2047,82 @@ intel_panel_init_backlight_funcs(struct intel_panel *panel)
>  		container_of(panel, struct intel_connector, panel);
>  	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
>  
> -	if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
> -	    intel_dp_aux_init_backlight_funcs(connector) == 0)
> -		return;
> -
>  	if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
>  	    intel_dsi_dcs_init_backlight_funcs(connector) == 0)
>  		return;
>  
>  	if (IS_GEN9_LP(dev_priv)) {
> -		panel->backlight.setup = bxt_setup_backlight;
> -		panel->backlight.enable = bxt_enable_backlight;
> -		panel->backlight.disable = bxt_disable_backlight;
> -		panel->backlight.set = bxt_set_backlight;
> -		panel->backlight.get = bxt_get_backlight;
> -		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
> +		panel->backlight.pwm_funcs.setup = bxt_setup_backlight;
> +		panel->backlight.pwm_funcs.enable = bxt_enable_backlight;
> +		panel->backlight.pwm_funcs.disable = bxt_disable_backlight;
> +		panel->backlight.pwm_funcs.set = bxt_set_backlight;
> +		panel->backlight.pwm_funcs.get = bxt_get_backlight;
> +		panel->backlight.pwm_funcs.hz_to_pwm = bxt_hz_to_pwm;
>  	} else if (INTEL_PCH_TYPE(dev_priv) >= PCH_CNP) {
> -		panel->backlight.setup = cnp_setup_backlight;
> -		panel->backlight.enable = cnp_enable_backlight;
> -		panel->backlight.disable = cnp_disable_backlight;
> -		panel->backlight.set = bxt_set_backlight;
> -		panel->backlight.get = bxt_get_backlight;
> -		panel->backlight.hz_to_pwm = cnp_hz_to_pwm;
> +		panel->backlight.pwm_funcs.setup = cnp_setup_backlight;
> +		panel->backlight.pwm_funcs.enable = cnp_enable_backlight;
> +		panel->backlight.pwm_funcs.disable = cnp_disable_backlight;
> +		panel->backlight.pwm_funcs.set = bxt_set_backlight;
> +		panel->backlight.pwm_funcs.get = bxt_get_backlight;
> +		panel->backlight.pwm_funcs.hz_to_pwm = cnp_hz_to_pwm;
>  	} else if (INTEL_PCH_TYPE(dev_priv) >= PCH_LPT) {
> -		panel->backlight.setup = lpt_setup_backlight;
> -		panel->backlight.enable = lpt_enable_backlight;
> -		panel->backlight.disable = lpt_disable_backlight;
> -		panel->backlight.set = lpt_set_backlight;
> -		panel->backlight.get = lpt_get_backlight;
> +		panel->backlight.pwm_funcs.setup = lpt_setup_backlight;
> +		panel->backlight.pwm_funcs.enable = lpt_enable_backlight;
> +		panel->backlight.pwm_funcs.disable = lpt_disable_backlight;
> +		panel->backlight.pwm_funcs.set = lpt_set_backlight;
> +		panel->backlight.pwm_funcs.get = lpt_get_backlight;
>  		if (HAS_PCH_LPT(dev_priv))
> -			panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
> +			panel->backlight.pwm_funcs.hz_to_pwm = lpt_hz_to_pwm;
>  		else
> -			panel->backlight.hz_to_pwm = spt_hz_to_pwm;
> +			panel->backlight.pwm_funcs.hz_to_pwm = spt_hz_to_pwm;
>  	} else if (HAS_PCH_SPLIT(dev_priv)) {
> -		panel->backlight.setup = pch_setup_backlight;
> -		panel->backlight.enable = pch_enable_backlight;
> -		panel->backlight.disable = pch_disable_backlight;
> -		panel->backlight.set = pch_set_backlight;
> -		panel->backlight.get = pch_get_backlight;
> -		panel->backlight.hz_to_pwm = pch_hz_to_pwm;
> +		panel->backlight.pwm_funcs.setup = pch_setup_backlight;
> +		panel->backlight.pwm_funcs.enable = pch_enable_backlight;
> +		panel->backlight.pwm_funcs.disable = pch_disable_backlight;
> +		panel->backlight.pwm_funcs.set = pch_set_backlight;
> +		panel->backlight.pwm_funcs.get = pch_get_backlight;
> +		panel->backlight.pwm_funcs.hz_to_pwm = pch_hz_to_pwm;
>  	} else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
>  		if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
> -			panel->backlight.setup = ext_pwm_setup_backlight;
> -			panel->backlight.enable = ext_pwm_enable_backlight;
> -			panel->backlight.disable = ext_pwm_disable_backlight;
> -			panel->backlight.set = ext_pwm_set_backlight;
> -			panel->backlight.get = ext_pwm_get_backlight;
> +			panel->backlight.pwm_funcs.setup = ext_pwm_setup_backlight;
> +			panel->backlight.pwm_funcs.enable = ext_pwm_enable_backlight;
> +			panel->backlight.pwm_funcs.disable = ext_pwm_disable_backlight;
> +			panel->backlight.pwm_funcs.set = ext_pwm_set_backlight;
> +			panel->backlight.pwm_funcs.get = ext_pwm_get_backlight;
>  		} else {
> -			panel->backlight.setup = vlv_setup_backlight;
> -			panel->backlight.enable = vlv_enable_backlight;
> -			panel->backlight.disable = vlv_disable_backlight;
> -			panel->backlight.set = vlv_set_backlight;
> -			panel->backlight.get = vlv_get_backlight;
> -			panel->backlight.hz_to_pwm = vlv_hz_to_pwm;
> +			panel->backlight.pwm_funcs.setup = vlv_setup_backlight;
> +			panel->backlight.pwm_funcs.enable = vlv_enable_backlight;
> +			panel->backlight.pwm_funcs.disable = vlv_disable_backlight;
> +			panel->backlight.pwm_funcs.set = vlv_set_backlight;
> +			panel->backlight.pwm_funcs.get = vlv_get_backlight;
> +			panel->backlight.pwm_funcs.hz_to_pwm = vlv_hz_to_pwm;
>  		}
>  	} else if (IS_GEN(dev_priv, 4)) {
> -		panel->backlight.setup = i965_setup_backlight;
> -		panel->backlight.enable = i965_enable_backlight;
> -		panel->backlight.disable = i965_disable_backlight;
> -		panel->backlight.set = i9xx_set_backlight;
> -		panel->backlight.get = i9xx_get_backlight;
> -		panel->backlight.hz_to_pwm = i965_hz_to_pwm;
> +		panel->backlight.pwm_funcs.setup = i965_setup_backlight;
> +		panel->backlight.pwm_funcs.enable = i965_enable_backlight;
> +		panel->backlight.pwm_funcs.disable = i965_disable_backlight;
> +		panel->backlight.pwm_funcs.set = i9xx_set_backlight;
> +		panel->backlight.pwm_funcs.get = i9xx_get_backlight;
> +		panel->backlight.pwm_funcs.hz_to_pwm = i965_hz_to_pwm;
>  	} else {
> -		panel->backlight.setup = i9xx_setup_backlight;
> -		panel->backlight.enable = i9xx_enable_backlight;
> -		panel->backlight.disable = i9xx_disable_backlight;
> -		panel->backlight.set = i9xx_set_backlight;
> -		panel->backlight.get = i9xx_get_backlight;
> -		panel->backlight.hz_to_pwm = i9xx_hz_to_pwm;
> +		panel->backlight.pwm_funcs.setup = i9xx_setup_backlight;
> +		panel->backlight.pwm_funcs.enable = i9xx_enable_backlight;
> +		panel->backlight.pwm_funcs.disable = i9xx_disable_backlight;
> +		panel->backlight.pwm_funcs.set = i9xx_set_backlight;
> +		panel->backlight.pwm_funcs.get = i9xx_get_backlight;
> +		panel->backlight.pwm_funcs.hz_to_pwm = i9xx_hz_to_pwm;
>  	}
> +
> +	if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
> +	    intel_dp_aux_init_backlight_funcs(connector) == 0)
> +		return;
> +
> +	/* We're using a standard PWM backlight interface */
> +	panel->backlight.setup = intel_pwm_setup_backlight;
> +	panel->backlight.enable = intel_pwm_enable_backlight;
> +	panel->backlight.disable = intel_pwm_disable_backlight;
> +	panel->backlight.set = intel_pwm_set_backlight;
> +	panel->backlight.get = intel_pwm_get_backlight;
>  }
>  
>  enum drm_connector_status
> -- 
> 2.26.2
> 
> _______________________________________________
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