[PATCH 1/2] drm/i915: make backlight functions take a connector v2

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On VLV/BYT, backlight controls a per-pipe, so when adjusting the
backlight we need to pass the correct info.  So make the externally
visible backlight functions take a connector argument, which can be used
internally to figure out the pipe backlight to adjust.

v2: make connector pipe lookup check for NULL crtc (Jani)
    fixup connector check in ASLE code (Jani)

Signed-off-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_drv.h       |  1 +
 drivers/gpu/drm/i915/intel_display.c  | 11 +++++
 drivers/gpu/drm/i915/intel_dp.c       |  5 +--
 drivers/gpu/drm/i915/intel_drv.h      |  8 ++--
 drivers/gpu/drm/i915/intel_lvds.c     |  9 ++--
 drivers/gpu/drm/i915/intel_opregion.c | 28 ++++++++++++-
 drivers/gpu/drm/i915/intel_panel.c    | 79 +++++++++++++++++++++++------------
 7 files changed, 105 insertions(+), 36 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index ed8653f..53a555c 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -54,6 +54,7 @@
 #define DRIVER_DATE		"20080730"
 
 enum pipe {
+	INVALID_PIPE = -1,
 	PIPE_A = 0,
 	PIPE_B,
 	PIPE_C,
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 0ba0af4..fd2c643 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9729,6 +9729,17 @@ static void intel_crtc_init(struct drm_device *dev, int pipe)
 	drm_crtc_helper_add(&intel_crtc->base, &intel_helper_funcs);
 }
 
+enum pipe intel_get_pipe_from_connector(struct intel_connector *connector)
+{
+	struct intel_encoder *encoder = connector->encoder;
+	struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
+
+	if (!crtc)
+		return INVALID_PIPE;
+
+	return crtc->pipe;
+}
+
 int intel_get_pipe_from_crtc_id(struct drm_device *dev, void *data,
 				struct drm_file *file)
 {
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 0ed7717..6391c7d 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1257,7 +1257,6 @@ void ironlake_edp_backlight_on(struct intel_dp *intel_dp)
 	struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
 	struct drm_device *dev = intel_dig_port->base.base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
-	int pipe = to_intel_crtc(intel_dig_port->base.base.crtc)->pipe;
 	u32 pp;
 	u32 pp_ctrl_reg;
 
@@ -1280,7 +1279,7 @@ void ironlake_edp_backlight_on(struct intel_dp *intel_dp)
 	I915_WRITE(pp_ctrl_reg, pp);
 	POSTING_READ(pp_ctrl_reg);
 
-	intel_panel_enable_backlight(dev, pipe);
+	intel_panel_enable_backlight(intel_dp->attached_connector);
 }
 
 void ironlake_edp_backlight_off(struct intel_dp *intel_dp)
@@ -1293,7 +1292,7 @@ void ironlake_edp_backlight_off(struct intel_dp *intel_dp)
 	if (!is_edp(intel_dp))
 		return;
 
-	intel_panel_disable_backlight(dev);
+	intel_panel_disable_backlight(intel_dp->attached_connector);
 
 	DRM_DEBUG_KMS("\n");
 	pp = ironlake_get_pp_control(intel_dp);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 922c5d7..476d98b 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -619,6 +619,7 @@ void intel_connector_attach_encoder(struct intel_connector *connector,
 struct drm_encoder *intel_best_encoder(struct drm_connector *connector);
 struct drm_display_mode *intel_crtc_mode_get(struct drm_device *dev,
 					     struct drm_crtc *crtc);
+enum pipe intel_get_pipe_from_connector(struct intel_connector *connector);
 int intel_get_pipe_from_crtc_id(struct drm_device *dev, void *data,
 				struct drm_file *file_priv);
 enum transcoder intel_pipe_to_cpu_transcoder(struct drm_i915_private *dev_priv,
@@ -767,10 +768,11 @@ void intel_pch_panel_fitting(struct intel_crtc *crtc,
 void intel_gmch_panel_fitting(struct intel_crtc *crtc,
 			      struct intel_crtc_config *pipe_config,
 			      int fitting_mode);
-void intel_panel_set_backlight(struct drm_device *dev, u32 level, u32 max);
+void intel_panel_set_backlight(struct intel_connector *connector, u32 level,
+			       u32 max);
 int intel_panel_setup_backlight(struct drm_connector *connector);
-void intel_panel_enable_backlight(struct drm_device *dev, enum pipe pipe);
-void intel_panel_disable_backlight(struct drm_device *dev);
+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_device *dev);
 enum drm_connector_status intel_panel_detect(struct drm_device *dev);
 
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index ae0c843..30933ab 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -206,7 +206,8 @@ static void intel_enable_lvds(struct intel_encoder *encoder)
 {
 	struct drm_device *dev = encoder->base.dev;
 	struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
-	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
+	struct intel_connector *intel_connector =
+		&lvds_encoder->attached_connector->base;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 ctl_reg, stat_reg;
 
@@ -225,13 +226,15 @@ static void intel_enable_lvds(struct intel_encoder *encoder)
 	if (wait_for((I915_READ(stat_reg) & PP_ON) != 0, 1000))
 		DRM_ERROR("timed out waiting for panel to power on\n");
 
-	intel_panel_enable_backlight(dev, intel_crtc->pipe);
+	intel_panel_enable_backlight(intel_connector);
 }
 
 static void intel_disable_lvds(struct intel_encoder *encoder)
 {
 	struct drm_device *dev = encoder->base.dev;
 	struct intel_lvds_encoder *lvds_encoder = to_lvds_encoder(&encoder->base);
+	struct intel_connector *intel_connector =
+		&lvds_encoder->attached_connector->base;
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 ctl_reg, stat_reg;
 
@@ -243,7 +246,7 @@ static void intel_disable_lvds(struct intel_encoder *encoder)
 		stat_reg = PP_STATUS;
 	}
 
-	intel_panel_disable_backlight(dev);
+	intel_panel_disable_backlight(intel_connector);
 
 	I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
 	if (wait_for((I915_READ(stat_reg) & PP_ON) == 0, 1000))
diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index 2acf5ca..a490c1d 100644
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -395,6 +395,11 @@ static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct opregion_asle __iomem *asle = dev_priv->opregion.asle;
+	struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[0];
+	struct drm_encoder *encoder;
+	struct drm_connector *connector;
+	struct intel_connector *intel_connector = NULL;
+	bool found = false;
 
 	DRM_DEBUG_DRIVER("bclp = 0x%08x\n", bclp);
 
@@ -405,7 +410,28 @@ static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
 	if (bclp > 255)
 		return ASLC_BACKLIGHT_FAILED;
 
-	intel_panel_set_backlight(dev, bclp, 255);
+	/*
+	 * Could match the OpRegion connector here instead, but we'd
+	 * also need to verify the connector could handle a backlight
+	 * call.
+	 */
+	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
+		if (encoder->crtc == crtc) {
+			found = true;
+			break;
+		}
+
+	if (!found)
+		return ASLC_BACKLIGHT_FAILED;
+
+	list_for_each_entry(connector, &dev->mode_config.connector_list, head)
+		if (connector->encoder == encoder)
+			intel_connector = to_intel_connector(connector);
+
+	if (!intel_connector)
+		return ASLC_BACKLIGHT_FAILED;
+
+	intel_panel_set_backlight(intel_connector, bclp, 255);
 	iowrite32(DIV_ROUND_UP(bclp * 100, 255) | ASLE_CBLV_VALID, &asle->cblv);
 
 	return 0;
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index 5468416..47a8d83 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -341,7 +341,7 @@ static int is_backlight_combination_mode(struct drm_device *dev)
 /* XXX: query mode clock or hardware clock and program max PWM appropriately
  * when it's 0.
  */
-static u32 i915_read_blc_pwm_ctl(struct drm_device *dev)
+static u32 i915_read_blc_pwm_ctl(struct drm_device *dev, enum pipe pipe)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 val;
@@ -380,11 +380,12 @@ static u32 i915_read_blc_pwm_ctl(struct drm_device *dev)
 	return val;
 }
 
-static u32 intel_panel_get_max_backlight(struct drm_device *dev)
+static u32 intel_panel_get_max_backlight(struct drm_device *dev,
+					 enum pipe pipe)
 {
 	u32 max;
 
-	max = i915_read_blc_pwm_ctl(dev);
+	max = i915_read_blc_pwm_ctl(dev, pipe);
 
 	if (HAS_PCH_SPLIT(dev)) {
 		max >>= 16;
@@ -410,7 +411,8 @@ MODULE_PARM_DESC(invert_brightness, "Invert backlight brightness "
 	"to dri-devel@xxxxxxxxxxxxxxxxxxxxx, if your machine needs it. "
 	"It will then be included in an upcoming module version.");
 module_param_named(invert_brightness, i915_panel_invert_brightness, int, 0600);
-static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
+static u32 intel_panel_compute_brightness(struct drm_device *dev,
+					  enum pipe pipe, u32 val)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
@@ -419,7 +421,7 @@ static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
 
 	if (i915_panel_invert_brightness > 0 ||
 	    dev_priv->quirks & QUIRK_INVERT_BRIGHTNESS) {
-		u32 max = intel_panel_get_max_backlight(dev);
+		u32 max = intel_panel_get_max_backlight(dev, pipe);
 		if (max)
 			return max - val;
 	}
@@ -427,7 +429,8 @@ static u32 intel_panel_compute_brightness(struct drm_device *dev, u32 val)
 	return val;
 }
 
-static u32 intel_panel_get_backlight(struct drm_device *dev)
+static u32 intel_panel_get_backlight(struct drm_device *dev,
+				     enum pipe pipe)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 val;
@@ -450,7 +453,7 @@ static u32 intel_panel_get_backlight(struct drm_device *dev)
 		}
 	}
 
-	val = intel_panel_compute_brightness(dev, val);
+	val = intel_panel_compute_brightness(dev, pipe, val);
 
 	spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 
@@ -466,19 +469,19 @@ static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)
 }
 
 static void intel_panel_actually_set_backlight(struct drm_device *dev,
-					       u32 level)
+					       enum pipe pipe, u32 level)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	u32 tmp;
 
 	DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
-	level = intel_panel_compute_brightness(dev, level);
+	level = intel_panel_compute_brightness(dev, pipe, level);
 
 	if (HAS_PCH_SPLIT(dev))
 		return intel_pch_panel_set_backlight(dev, level);
 
 	if (is_backlight_combination_mode(dev)) {
-		u32 max = intel_panel_get_max_backlight(dev);
+		u32 max = intel_panel_get_max_backlight(dev, pipe);
 		u8 lbpc;
 
 		/* we're screwed, but keep behaviour backwards compatible */
@@ -498,15 +501,21 @@ static void intel_panel_actually_set_backlight(struct drm_device *dev,
 }
 
 /* set backlight brightness to level in range [0..max] */
-void intel_panel_set_backlight(struct drm_device *dev, u32 level, u32 max)
+void intel_panel_set_backlight(struct intel_connector *connector, u32 level,
+			       u32 max)
 {
+	struct drm_device *dev = connector->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
+	enum pipe pipe = intel_get_pipe_from_connector(connector);
 	u32 freq;
 	unsigned long flags;
 
+	if (pipe == INVALID_PIPE)
+		return;
+
 	spin_lock_irqsave(&dev_priv->backlight.lock, flags);
 
-	freq = intel_panel_get_max_backlight(dev);
+	freq = intel_panel_get_max_backlight(dev, pipe);
 	if (!freq) {
 		/* we are screwed, bail out */
 		goto out;
@@ -523,16 +532,21 @@ void intel_panel_set_backlight(struct drm_device *dev, u32 level, u32 max)
 		dev_priv->backlight.device->props.brightness = level;
 
 	if (dev_priv->backlight.enabled)
-		intel_panel_actually_set_backlight(dev, level);
+		intel_panel_actually_set_backlight(dev, pipe, level);
 out:
 	spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 }
 
-void intel_panel_disable_backlight(struct drm_device *dev)
+void intel_panel_disable_backlight(struct intel_connector *connector)
 {
+	struct drm_device *dev = connector->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
+	enum pipe pipe = intel_get_pipe_from_connector(connector);
 	unsigned long flags;
 
+	if (pipe == INVALID_PIPE)
+		return;
+
 	/*
 	 * Do not disable backlight on the vgaswitcheroo path. When switching
 	 * away from i915, the other client may depend on i915 to handle the
@@ -547,7 +561,7 @@ void intel_panel_disable_backlight(struct drm_device *dev)
 	spin_lock_irqsave(&dev_priv->backlight.lock, flags);
 
 	dev_priv->backlight.enabled = false;
-	intel_panel_actually_set_backlight(dev, 0);
+	intel_panel_actually_set_backlight(dev, pipe, 0);
 
 	if (INTEL_INFO(dev)->gen >= 4) {
 		uint32_t reg, tmp;
@@ -566,18 +580,23 @@ void intel_panel_disable_backlight(struct drm_device *dev)
 	spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 }
 
-void intel_panel_enable_backlight(struct drm_device *dev,
-				  enum pipe pipe)
+void intel_panel_enable_backlight(struct intel_connector *connector)
 {
+	struct drm_device *dev = connector->base.dev;
 	struct drm_i915_private *dev_priv = dev->dev_private;
+	enum pipe pipe = intel_get_pipe_from_connector(connector);
 	enum transcoder cpu_transcoder =
 		intel_pipe_to_cpu_transcoder(dev_priv, pipe);
 	unsigned long flags;
 
+	if (pipe == INVALID_PIPE)
+		return;
+
 	spin_lock_irqsave(&dev_priv->backlight.lock, flags);
 
 	if (dev_priv->backlight.level == 0) {
-		dev_priv->backlight.level = intel_panel_get_max_backlight(dev);
+		dev_priv->backlight.level = intel_panel_get_max_backlight(dev,
+									  pipe);
 		if (dev_priv->backlight.device)
 			dev_priv->backlight.device->props.brightness =
 				dev_priv->backlight.level;
@@ -627,7 +646,8 @@ set_level:
 	 * registers are set.
 	 */
 	dev_priv->backlight.enabled = true;
-	intel_panel_actually_set_backlight(dev, dev_priv->backlight.level);
+	intel_panel_actually_set_backlight(dev, pipe,
+					   dev_priv->backlight.level);
 
 	spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 }
@@ -650,7 +670,7 @@ static void intel_panel_init_backlight(struct drm_device *dev)
 
 	intel_panel_init_backlight_regs(dev);
 
-	dev_priv->backlight.level = intel_panel_get_backlight(dev);
+	dev_priv->backlight.level = intel_panel_get_backlight(dev, 0);
 	dev_priv->backlight.enabled = dev_priv->backlight.level != 0;
 }
 
@@ -679,16 +699,21 @@ intel_panel_detect(struct drm_device *dev)
 #if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
 static int intel_panel_update_status(struct backlight_device *bd)
 {
-	struct drm_device *dev = bl_get_data(bd);
-	intel_panel_set_backlight(dev, bd->props.brightness,
+	struct intel_connector *connector = bl_get_data(bd);
+	intel_panel_set_backlight(connector, bd->props.brightness,
 				  bd->props.max_brightness);
 	return 0;
 }
 
 static int intel_panel_get_brightness(struct backlight_device *bd)
 {
-	struct drm_device *dev = bl_get_data(bd);
-	return intel_panel_get_backlight(dev);
+	struct intel_connector *connector = bl_get_data(bd);
+	enum pipe pipe = intel_get_pipe_from_connector(connector);
+
+	if (pipe == INVALID_PIPE)
+		return 0;
+
+	return intel_panel_get_backlight(connector->base.dev, pipe);
 }
 
 static const struct backlight_ops intel_panel_bl_ops = {
@@ -708,12 +733,13 @@ int intel_panel_setup_backlight(struct drm_connector *connector)
 	if (WARN_ON(dev_priv->backlight.device))
 		return -ENODEV;
 
+	/* Just create a device for pipe 0 */
 	memset(&props, 0, sizeof(props));
 	props.type = BACKLIGHT_RAW;
 	props.brightness = dev_priv->backlight.level;
 
 	spin_lock_irqsave(&dev_priv->backlight.lock, flags);
-	props.max_brightness = intel_panel_get_max_backlight(dev);
+	props.max_brightness = intel_panel_get_max_backlight(dev, 0);
 	spin_unlock_irqrestore(&dev_priv->backlight.lock, flags);
 
 	if (props.max_brightness == 0) {
@@ -722,7 +748,8 @@ int intel_panel_setup_backlight(struct drm_connector *connector)
 	}
 	dev_priv->backlight.device =
 		backlight_device_register("intel_backlight",
-					  &connector->kdev, dev,
+					  &connector->kdev,
+					  to_intel_connector(connector),
 					  &intel_panel_bl_ops, &props);
 
 	if (IS_ERR(dev_priv->backlight.device)) {
-- 
1.8.3.1

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