drm/i915: make backlight hooks connector specific

Previously we've relied on having basically one backlight and one
backlight type per platform. This is already a bit quirky with PMIC PWM
support on VLV/CHV platforms with MIPI DSI. In the foreseeable future
we'll have at least DPCD based backlight control on eDP and DCS command
based backlight control on MIPI DSI. Backlight is becoming more and more
connector specific, so reflect this fact by making the backlight control
hooks connector specific.

This enables further work to reuse generic backlight code in
intel_panel.c while adding more specific backlight code accessed via the
hooks.

Cc: Deepak M <m.deepak@intel.com>
Cc: Yetunde Adebisi <yetundex.adebisi@intel.com>
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Reviewed-by: NDeepak M <m.deepak@intel.com>
Reviewed-by: NYetunde Adebisi <yetundex.adebisi@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_drv.h

@@ -664,15 +664,6 @@ struct drm_i915_display_funcs {
 	/* render clock increase/decrease */
 	/* display clock increase/decrease */
 	/* pll clock increase/decrease */
-
-	int (*setup_backlight)(struct intel_connector *connector, enum pipe pipe);
-	uint32_t (*get_backlight)(struct intel_connector *connector);
-	void (*set_backlight)(struct intel_connector *connector,
-			      uint32_t level);
-	void (*disable_backlight)(struct intel_connector *connector);
-	void (*enable_backlight)(struct intel_connector *connector);
-	uint32_t (*backlight_hz_to_pwm)(struct intel_connector *connector,
-					uint32_t hz);
 };
 
 enum forcewake_domain_id {

drivers/gpu/drm/i915/intel_display.c

@@ -14575,8 +14575,6 @@ static void intel_init_display(struct drm_device *dev)
 		dev_priv->display.queue_flip = intel_default_queue_flip;
 	}
 
-	intel_panel_init_backlight_funcs(dev);
-
 	mutex_init(&dev_priv->pps_mutex);
 }
 

drivers/gpu/drm/i915/intel_dp.c

@@ -6000,7 +6000,7 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
 	}
 
 	intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode);
-	intel_connector->panel.backlight_power = intel_edp_backlight_power;
+	intel_connector->panel.backlight.power = intel_edp_backlight_power;
 	intel_panel_setup_backlight(connector, pipe);
 
 	return true;

drivers/gpu/drm/i915/intel_drv.h

@@ -182,9 +182,17 @@ struct intel_panel {
 		struct pwm_device *pwm;
 
 		struct backlight_device *device;
-	} backlight;
 
-	void (*backlight_power)(struct intel_connector *, bool enable);
+		/* Connector and platform specific backlight functions */
+		int (*setup)(struct intel_connector *connector, enum pipe pipe);
+		uint32_t (*get)(struct intel_connector *connector);
+		void (*set)(struct intel_connector *connector, uint32_t level);
+		void (*disable)(struct intel_connector *connector);
+		void (*enable)(struct intel_connector *connector);
+		uint32_t (*hz_to_pwm)(struct intel_connector *connector,
+				      uint32_t hz);
+		void (*power)(struct intel_connector *, bool enable);
+	} backlight;
 };
 
 struct intel_connector {
@@ -1333,7 +1341,6 @@ int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
 void intel_panel_enable_backlight(struct intel_connector *connector);
 void intel_panel_disable_backlight(struct intel_connector *connector);
 void intel_panel_destroy_backlight(struct drm_connector *connector);
-void intel_panel_init_backlight_funcs(struct drm_device *dev);
 enum drm_connector_status intel_panel_detect(struct drm_device *dev);
 extern struct drm_display_mode *intel_find_panel_downclock(
 				struct drm_device *dev,

drivers/gpu/drm/i915/intel_panel.c

@@ -560,7 +560,7 @@ static u32 intel_panel_get_backlight(struct intel_connector *connector)
 	mutex_lock(&dev_priv->backlight_lock);
 
 	if (panel->backlight.enabled) {
-		val = dev_priv->display.get_backlight(connector);
+		val = panel->backlight.get(connector);
 		val = intel_panel_compute_brightness(connector, val);
 	}
 
@@ -649,13 +649,12 @@ static void pwm_set_backlight(struct intel_connector *connector, u32 level)
 static void
 intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
 {
-	struct drm_device *dev = connector->base.dev;
-	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_panel *panel = &connector->panel;
 
 	DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 
 	level = intel_panel_compute_brightness(connector, level);
-	dev_priv->display.set_backlight(connector, level);
+	panel->backlight.set(connector, level);
 }
 
 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
@@ -830,7 +829,7 @@ void intel_panel_disable_backlight(struct intel_connector *connector)
 	if (panel->backlight.device)
 		panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 	panel->backlight.enabled = false;
-	dev_priv->display.disable_backlight(connector);
+	panel->backlight.disable(connector);
 
 	mutex_unlock(&dev_priv->backlight_lock);
 }
@@ -1079,7 +1078,7 @@ void intel_panel_enable_backlight(struct intel_connector *connector)
 						 panel->backlight.device->props.max_brightness);
 	}
 
-	dev_priv->display.enable_backlight(connector);
+	panel->backlight.enable(connector);
 	panel->backlight.enabled = true;
 	if (panel->backlight.device)
 		panel->backlight.device->props.power = FB_BLANK_UNBLANK;
@@ -1107,10 +1106,10 @@ static int intel_backlight_device_update_status(struct backlight_device *bd)
 	 * callback needs to take this into account.
 	 */
 	if (panel->backlight.enabled) {
-		if (panel->backlight_power) {
+		if (panel->backlight.power) {
 			bool enable = bd->props.power == FB_BLANK_UNBLANK &&
 				bd->props.brightness != 0;
-			panel->backlight_power(connector, enable);
+			panel->backlight.power(connector, enable);
 		}
 	} else {
 		bd->props.power = FB_BLANK_POWERDOWN;
@@ -1335,6 +1334,7 @@ static u32 get_backlight_max_vbt(struct intel_connector *connector)
 {
 	struct drm_device *dev = connector->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_panel *panel = &connector->panel;
 	u16 pwm_freq_hz = dev_priv->vbt.backlight.pwm_freq_hz;
 	u32 pwm;
 
@@ -1343,12 +1343,12 @@ static u32 get_backlight_max_vbt(struct intel_connector *connector)
 		return 0;
 	}
 
-	if (!dev_priv->display.backlight_hz_to_pwm) {
+	if (!panel->backlight.hz_to_pwm) {
 		DRM_DEBUG_KMS("backlight frequency setting from VBT currently not supported on this platform\n");
 		return 0;
 	}
 
-	pwm = dev_priv->display.backlight_hz_to_pwm(connector, pwm_freq_hz);
+	pwm = panel->backlight.hz_to_pwm(connector, pwm_freq_hz);
 	if (!pwm) {
 		DRM_DEBUG_KMS("backlight frequency conversion failed\n");
 		return 0;
@@ -1633,9 +1633,13 @@ int intel_panel_setup_backlight(struct drm_connector *connector, enum pipe pipe)
 		}
 	}
 
+	/* ensure intel_panel has been initialized first */
+	if (WARN_ON(!panel->backlight.setup))
+		return -ENODEV;
+
 	/* set level and max in panel struct */
 	mutex_lock(&dev_priv->backlight_lock);
-	ret = dev_priv->display.setup_backlight(intel_connector, pipe);
+	ret = panel->backlight.setup(intel_connector, pipe);
 	mutex_unlock(&dev_priv->backlight_lock);
 
 	if (ret) {
@@ -1667,62 +1671,66 @@ void intel_panel_destroy_backlight(struct drm_connector *connector)
 }
 
 /* Set up chip specific backlight functions */
-void intel_panel_init_backlight_funcs(struct drm_device *dev)
+static void
+intel_panel_init_backlight_funcs(struct intel_panel *panel)
 {
+	struct intel_connector *intel_connector =
+		container_of(panel, struct intel_connector, panel);
+	struct drm_device *dev = intel_connector->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
 	if (IS_BROXTON(dev)) {
-		dev_priv->display.setup_backlight = bxt_setup_backlight;
-		dev_priv->display.enable_backlight = bxt_enable_backlight;
-		dev_priv->display.disable_backlight = bxt_disable_backlight;
-		dev_priv->display.set_backlight = bxt_set_backlight;
-		dev_priv->display.get_backlight = bxt_get_backlight;
+		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;
 	} else if (HAS_PCH_LPT(dev) || HAS_PCH_SPT(dev)) {
-		dev_priv->display.setup_backlight = lpt_setup_backlight;
-		dev_priv->display.enable_backlight = lpt_enable_backlight;
-		dev_priv->display.disable_backlight = lpt_disable_backlight;
-		dev_priv->display.set_backlight = lpt_set_backlight;
-		dev_priv->display.get_backlight = lpt_get_backlight;
+		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;
 		if (HAS_PCH_LPT(dev))
-			dev_priv->display.backlight_hz_to_pwm = lpt_hz_to_pwm;
+			panel->backlight.hz_to_pwm = lpt_hz_to_pwm;
 		else
-			dev_priv->display.backlight_hz_to_pwm = spt_hz_to_pwm;
+			panel->backlight.hz_to_pwm = spt_hz_to_pwm;
 	} else if (HAS_PCH_SPLIT(dev)) {
-		dev_priv->display.setup_backlight = pch_setup_backlight;
-		dev_priv->display.enable_backlight = pch_enable_backlight;
-		dev_priv->display.disable_backlight = pch_disable_backlight;
-		dev_priv->display.set_backlight = pch_set_backlight;
-		dev_priv->display.get_backlight = pch_get_backlight;
-		dev_priv->display.backlight_hz_to_pwm = pch_hz_to_pwm;
+		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;
 	} else if (IS_VALLEYVIEW(dev)) {
 		if (dev_priv->vbt.has_mipi) {
-			dev_priv->display.setup_backlight = pwm_setup_backlight;
-			dev_priv->display.enable_backlight = pwm_enable_backlight;
-			dev_priv->display.disable_backlight = pwm_disable_backlight;
-			dev_priv->display.set_backlight = pwm_set_backlight;
-			dev_priv->display.get_backlight = pwm_get_backlight;
+			panel->backlight.setup = pwm_setup_backlight;
+			panel->backlight.enable = pwm_enable_backlight;
+			panel->backlight.disable = pwm_disable_backlight;
+			panel->backlight.set = pwm_set_backlight;
+			panel->backlight.get = pwm_get_backlight;
 		} else {
-			dev_priv->display.setup_backlight = vlv_setup_backlight;
-			dev_priv->display.enable_backlight = vlv_enable_backlight;
-			dev_priv->display.disable_backlight = vlv_disable_backlight;
-			dev_priv->display.set_backlight = vlv_set_backlight;
-			dev_priv->display.get_backlight = vlv_get_backlight;
-			dev_priv->display.backlight_hz_to_pwm = vlv_hz_to_pwm;
+			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;
 		}
 	} else if (IS_GEN4(dev)) {
-		dev_priv->display.setup_backlight = i965_setup_backlight;
-		dev_priv->display.enable_backlight = i965_enable_backlight;
-		dev_priv->display.disable_backlight = i965_disable_backlight;
-		dev_priv->display.set_backlight = i9xx_set_backlight;
-		dev_priv->display.get_backlight = i9xx_get_backlight;
-		dev_priv->display.backlight_hz_to_pwm = i965_hz_to_pwm;
+		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;
 	} else {
-		dev_priv->display.setup_backlight = i9xx_setup_backlight;
-		dev_priv->display.enable_backlight = i9xx_enable_backlight;
-		dev_priv->display.disable_backlight = i9xx_disable_backlight;
-		dev_priv->display.set_backlight = i9xx_set_backlight;
-		dev_priv->display.get_backlight = i9xx_get_backlight;
-		dev_priv->display.backlight_hz_to_pwm = i9xx_hz_to_pwm;
+		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;
 	}
 }
 
@@ -1730,6 +1738,8 @@ int intel_panel_init(struct intel_panel *panel,
 		     struct drm_display_mode *fixed_mode,
 		     struct drm_display_mode *downclock_mode)
 {
+	intel_panel_init_backlight_funcs(panel);
+
 	panel->fixed_mode = fixed_mode;
 	panel->downclock_mode = downclock_mode;