drm/i915: Pass atomic state to backlight enable/disable/set callbacks.

Pass crtc_state to the enable callback, and connector_state to all callbacks.
This will eliminate the need to guess for the correct pipe in these
callbacks.

The crtc state is required for pch_enable_backlight to obtain the correct
cpu_transcoder.

intel_dp_aux_backlight's setup function is called before hw readout, so
crtc_state and connector_state->best_encoder are NULL in the enable()
and set() callbacks.

This fixes the following series of warns from intel_get_pipe_from_connector:
[  219.968428] ------------[ cut here ]------------
[  219.968481] WARNING: CPU: 3 PID: 2457 at
drivers/gpu/drm/i915/intel_display.c:13881
intel_get_pipe_from_connector+0x62/0x90 [i915]
[  219.968483]
WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex))
[  219.968485] Modules linked in: nls_iso8859_1 snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_codec
snd_hda_core snd_hwdep snd_pcm intel_rapl x86_pkg_temp_thermal coretemp
kvm_intel snd_seq_midi snd_seq_midi_event kvm snd_rawmidi irqbypass
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc snd_seq
snd_seq_device serio_raw snd_timer aesni_intel aes_x86_64 crypto_simd
glue_helper cryptd lpc_ich snd mei_me shpchp soundcore mei rfkill_gpio
mac_hid intel_pmc_ipc parport_pc ppdev lp parport ip_tables x_tables
autofs4 hid_generic usbhid igb ahci i915 xhci_pci dca xhci_hcd ptp
sdhci_pci sdhci libahci pps_core i2c_hid hid video
[  219.968573] CPU: 3 PID: 2457 Comm: kworker/u8:3 Tainted: G        W
4.10.0-tip-201703010159+ #2
[  219.968575] Hardware name: Intel Corp. Broxton P/NOTEBOOK, BIOS
APLKRVPA.X64.0144.B10.1606270006 06/27/2016
[  219.968627] Workqueue: events_unbound intel_atomic_commit_work [i915]
[  219.968629] Call Trace:
[  219.968640]  dump_stack+0x63/0x87
[  219.968646]  __warn+0xd1/0xf0
[  219.968651]  warn_slowpath_fmt+0x4f/0x60
[  219.968657]  ? drm_printk+0x97/0xa0
[  219.968708]  intel_get_pipe_from_connector+0x62/0x90 [i915]
[  219.968756]  intel_panel_enable_backlight+0x19/0xf0 [i915]
[  219.968804]  intel_edp_backlight_on.part.22+0x33/0x40 [i915]
[  219.968852]  intel_edp_backlight_on+0x18/0x20 [i915]
[  219.968900]  intel_enable_ddi+0x94/0xc0 [i915]
[  219.968950]  intel_encoders_enable.isra.93+0x77/0x90 [i915]
[  219.969000]  haswell_crtc_enable+0x310/0x7f0 [i915]
[  219.969051]  intel_update_crtc+0x58/0x100 [i915]
[  219.969101]  skl_update_crtcs+0x218/0x240 [i915]
[  219.969153]  intel_atomic_commit_tail+0x350/0x1000 [i915]
[  219.969159]  ? vtime_account_idle+0xe/0x50
[  219.969164]  ? finish_task_switch+0x107/0x250
[  219.969214]  intel_atomic_commit_work+0x12/0x20 [i915]
[  219.969219]  process_one_work+0x153/0x3f0
[  219.969223]  worker_thread+0x12b/0x4b0
[  219.969227]  kthread+0x101/0x140
[  219.969230]  ? rescuer_thread+0x340/0x340
[  219.969233]  ? kthread_park+0x90/0x90
[  219.969237]  ? do_syscall_64+0x6e/0x180
[  219.969243]  ret_from_fork+0x2c/0x40
[  219.969246] ---[ end trace 0a8fa19387b9ad6d ]---

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=100022
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170612102115.23665-4-maarten.lankhorst@linux.intel.com
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

drivers/gpu/drm/i915/intel_dp_aux_backlight.c

@@ -78,8 +78,13 @@ static uint32_t intel_dp_aux_get_backlight(struct intel_connector *connector)
  * 8-bit or 16 bit value (MSB and LSB)
  */
 static void
-intel_dp_aux_set_backlight(struct intel_connector *connector, u32 level)
+intel_dp_aux_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 {
+	/*
+	 * conn_state->best_encoder is likely NULL when called from
+	 * intel_dp_aux_setup_backlight()
+	 */
+	struct intel_connector *connector = to_intel_connector(conn_state->connector);
 	struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
 	uint8_t vals[2] = { 0x0 };
 
@@ -97,8 +102,14 @@ intel_dp_aux_set_backlight(struct intel_connector *connector, u32 level)
 	}
 }
 
-static void intel_dp_aux_enable_backlight(struct intel_connector *connector)
+static void intel_dp_aux_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);
+	/*
+	 * conn_state->best_encoder (and crtc_state) are NULL when called from
+	 * intel_dp_aux_setup_backlight()
+	 */
 	struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
 	uint8_t dpcd_buf = 0;
 	uint8_t edp_backlight_mode = 0;
@@ -131,12 +142,12 @@ static void intel_dp_aux_enable_backlight(struct intel_connector *connector)
 	}
 
 	set_aux_backlight_enable(intel_dp, true);
-	intel_dp_aux_set_backlight(connector, connector->panel.backlight.level);
+	intel_dp_aux_set_backlight(conn_state, connector->panel.backlight.level);
 }
 
-static void intel_dp_aux_disable_backlight(struct intel_connector *connector)
+static void intel_dp_aux_disable_backlight(const struct drm_connector_state *old_conn_state)
 {
-	set_aux_backlight_enable(enc_to_intel_dp(&connector->encoder->base), false);
+	set_aux_backlight_enable(enc_to_intel_dp(old_conn_state->best_encoder), false);
 }
 
 static int intel_dp_aux_setup_backlight(struct intel_connector *connector,
@@ -145,7 +156,7 @@ static int intel_dp_aux_setup_backlight(struct intel_connector *connector,
 	struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
 	struct intel_panel *panel = &connector->panel;
 
-	intel_dp_aux_enable_backlight(connector);
+	intel_dp_aux_enable_backlight(NULL, connector->base.state);
 
 	if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT)
 		panel->backlight.max = 0xFFFF;
@@ -165,7 +176,7 @@ intel_dp_aux_display_control_capable(struct intel_connector *connector)
 {
 	struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
 
-	/* Check the  eDP Display control capabilities registers to determine if
+	/* Check the eDP Display control capabilities registers to determine if
 	 * the panel can support backlight control over the aux channel
 	 */
 	if (intel_dp->edp_dpcd[1] & DP_EDP_TCON_BACKLIGHT_ADJUSTMENT_CAP &&

drivers/gpu/drm/i915/intel_drv.h

@@ -288,9 +288,10 @@ struct intel_panel {
 		/* 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);
+		void (*set)(const struct drm_connector_state *conn_state, uint32_t level);
+		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);
 		uint32_t (*hz_to_pwm)(struct intel_connector *connector,
 				      uint32_t hz);
 		void (*power)(struct intel_connector *, bool enable);

drivers/gpu/drm/i915/intel_dsi_dcs_backlight.c

@@ -60,10 +60,9 @@ static u32 dcs_get_backlight(struct intel_connector *connector)
 	return data;
 }
 
-static void dcs_set_backlight(struct intel_connector *connector, u32 level)
+static void dcs_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 {
-	struct intel_encoder *encoder = connector->encoder;
-	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+	struct intel_dsi *intel_dsi = enc_to_intel_dsi(conn_state->best_encoder);
 	struct mipi_dsi_device *dsi_device;
 	u8 data = level;
 	enum port port;
@@ -76,14 +75,13 @@ static void dcs_set_backlight(struct intel_connector *connector, u32 level)
 	}
 }
 
-static void dcs_disable_backlight(struct intel_connector *connector)
+static void dcs_disable_backlight(const struct drm_connector_state *conn_state)
 {
-	struct intel_encoder *encoder = connector->encoder;
-	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+	struct intel_dsi *intel_dsi = enc_to_intel_dsi(conn_state->best_encoder);
 	struct mipi_dsi_device *dsi_device;
 	enum port port;
 
-	dcs_set_backlight(connector, 0);
+	dcs_set_backlight(conn_state, 0);
 
 	for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) {
 		u8 cabc = POWER_SAVE_OFF;
@@ -110,11 +108,11 @@ static void dcs_disable_backlight(struct intel_connector *connector)
 	}
 }
 
-static void dcs_enable_backlight(struct intel_connector *connector)
+static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state,
+				 const struct drm_connector_state *conn_state)
 {
-	struct intel_encoder *encoder = connector->encoder;
-	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
-	struct intel_panel *panel = &connector->panel;
+	struct intel_dsi *intel_dsi = enc_to_intel_dsi(conn_state->best_encoder);
+	struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
 	struct mipi_dsi_device *dsi_device;
 	enum port port;
 
@@ -142,7 +140,7 @@ static void dcs_enable_backlight(struct intel_connector *connector)
 				   &cabc, sizeof(cabc));
 	}
 
-	dcs_set_backlight(connector, panel->backlight.level);
+	dcs_set_backlight(conn_state, panel->backlight.level);
 }
 
 static int dcs_setup_backlight(struct intel_connector *connector,

drivers/gpu/drm/i915/intel_panel.c

@@ -561,15 +561,18 @@ static u32 intel_panel_get_backlight(struct intel_connector *connector)
 	return val;
 }
 
-static void lpt_set_backlight(struct intel_connector *connector, u32 level)
+static void lpt_set_backlight(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);
+
 	u32 val = I915_READ(BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 	I915_WRITE(BLC_PWM_PCH_CTL2, val | level);
 }
 
-static void pch_set_backlight(struct intel_connector *connector, u32 level)
+static void pch_set_backlight(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);
 	u32 tmp;
 
@@ -577,8 +580,9 @@ static void pch_set_backlight(struct intel_connector *connector, u32 level)
 	I915_WRITE(BLC_PWM_CPU_CTL, tmp | level);
 }
 
-static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
+static void i9xx_set_backlight(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);
 	struct intel_panel *panel = &connector->panel;
 	u32 tmp, mask;
@@ -604,50 +608,51 @@ static void i9xx_set_backlight(struct intel_connector *connector, u32 level)
 	I915_WRITE(BLC_PWM_CTL, tmp | level);
 }
 
-static void vlv_set_backlight(struct intel_connector *connector, u32 level)
+static void vlv_set_backlight(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);
-	enum pipe pipe = intel_get_pipe_from_connector(connector);
+	enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
 	u32 tmp;
 
-	if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
-		return;
-
 	tmp = I915_READ(VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
 	I915_WRITE(VLV_BLC_PWM_CTL(pipe), tmp | level);
 }
 
-static void bxt_set_backlight(struct intel_connector *connector, u32 level)
+static void bxt_set_backlight(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);
 	struct intel_panel *panel = &connector->panel;
 
 	I915_WRITE(BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
 }
 
-static void pwm_set_backlight(struct intel_connector *connector, u32 level)
+static void pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 {
-	struct intel_panel *panel = &connector->panel;
+	struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
 	int duty_ns = DIV_ROUND_UP(level * CRC_PMIC_PWM_PERIOD_NS, 100);
 
 	pwm_config(panel->backlight.pwm, duty_ns, CRC_PMIC_PWM_PERIOD_NS);
 }
 
 static void
-intel_panel_actually_set_backlight(struct intel_connector *connector, u32 level)
+intel_panel_actually_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;
 
 	DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);
 
 	level = intel_panel_compute_brightness(connector, level);
-	panel->backlight.set(connector, level);
+	panel->backlight.set(conn_state, level);
 }
 
 /* set backlight brightness to level in range [0..max], scaling wrt hw min */
-static void intel_panel_set_backlight(struct intel_connector *connector,
+static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
 				      u32 user_level, u32 user_max)
 {
+	struct intel_connector *connector = to_intel_connector(conn_state->connector);
 	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
 	struct intel_panel *panel = &connector->panel;
 	u32 hw_level;
@@ -663,7 +668,7 @@ static void intel_panel_set_backlight(struct intel_connector *connector,
 	panel->backlight.level = hw_level;
 
 	if (panel->backlight.enabled)
-		intel_panel_actually_set_backlight(connector, hw_level);
+		intel_panel_actually_set_backlight(conn_state, hw_level);
 
 	mutex_unlock(&dev_priv->backlight_lock);
 }
@@ -702,17 +707,18 @@ void intel_panel_set_backlight_acpi(const struct drm_connector_state *conn_state
 					 panel->backlight.device->props.max_brightness);
 
 	if (panel->backlight.enabled)
-		intel_panel_actually_set_backlight(connector, hw_level);
+		intel_panel_actually_set_backlight(conn_state, hw_level);
 
 	mutex_unlock(&dev_priv->backlight_lock);
 }
 
-static void lpt_disable_backlight(struct intel_connector *connector)
+static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state)
 {
+	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(connector, 0);
+	intel_panel_actually_set_backlight(old_conn_state, 0);
 
 	/*
 	 * Although we don't support or enable CPU PWM with LPT/SPT based
@@ -732,12 +738,13 @@ static void lpt_disable_backlight(struct intel_connector *connector)
 	I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 }
 
-static void pch_disable_backlight(struct intel_connector *connector)
+static void pch_disable_backlight(const struct drm_connector_state *old_conn_state)
 {
+	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(connector, 0);
+	intel_panel_actually_set_backlight(old_conn_state, 0);
 
 	tmp = I915_READ(BLC_PWM_CPU_CTL2);
 	I915_WRITE(BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
@@ -746,44 +753,43 @@ static void pch_disable_backlight(struct intel_connector *connector)
 	I915_WRITE(BLC_PWM_PCH_CTL1, tmp & ~BLM_PCH_PWM_ENABLE);
 }
 
-static void i9xx_disable_backlight(struct intel_connector *connector)
+static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state)
 {
-	intel_panel_actually_set_backlight(connector, 0);
+	intel_panel_actually_set_backlight(old_conn_state, 0);
 }
 
-static void i965_disable_backlight(struct intel_connector *connector)
+static void i965_disable_backlight(const struct drm_connector_state *old_conn_state)
 {
-	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	struct drm_i915_private *dev_priv = to_i915(old_conn_state->connector->dev);
 	u32 tmp;
 
-	intel_panel_actually_set_backlight(connector, 0);
+	intel_panel_actually_set_backlight(old_conn_state, 0);
 
 	tmp = I915_READ(BLC_PWM_CTL2);
 	I915_WRITE(BLC_PWM_CTL2, tmp & ~BLM_PWM_ENABLE);
 }
 
-static void vlv_disable_backlight(struct intel_connector *connector)
+static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state)
 {
+	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 = intel_get_pipe_from_connector(connector);
+	enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
 	u32 tmp;
 
-	if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
-		return;
-
-	intel_panel_actually_set_backlight(connector, 0);
+	intel_panel_actually_set_backlight(old_conn_state, 0);
 
 	tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 	I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp & ~BLM_PWM_ENABLE);
 }
 
-static void bxt_disable_backlight(struct intel_connector *connector)
+static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state)
 {
+	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;
 
-	intel_panel_actually_set_backlight(connector, 0);
+	intel_panel_actually_set_backlight(old_conn_state, 0);
 
 	tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
 	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
@@ -796,21 +802,23 @@ static void bxt_disable_backlight(struct intel_connector *connector)
 	}
 }
 
-static void cnp_disable_backlight(struct intel_connector *connector)
+static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state)
 {
+	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(connector, 0);
+	intel_panel_actually_set_backlight(old_conn_state, 0);
 
 	tmp = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
 	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
 		   tmp & ~BXT_BLC_PWM_ENABLE);
 }
 
-static void pwm_disable_backlight(struct intel_connector *connector)
+static void pwm_disable_backlight(const struct drm_connector_state *old_conn_state)
 {
+	struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
 	struct intel_panel *panel = &connector->panel;
 
 	/* Disable the backlight */
@@ -844,13 +852,15 @@ void intel_panel_disable_backlight(const struct drm_connector_state *old_conn_st
 	if (panel->backlight.device)
 		panel->backlight.device->props.power = FB_BLANK_POWERDOWN;
 	panel->backlight.enabled = false;
-	panel->backlight.disable(connector);
+	panel->backlight.disable(old_conn_state);
 
 	mutex_unlock(&dev_priv->backlight_lock);
 }
 
-static void lpt_enable_backlight(struct intel_connector *connector)
+static void lpt_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 drm_i915_private *dev_priv = to_i915(connector->base.dev);
 	struct intel_panel *panel = &connector->panel;
 	u32 pch_ctl1, pch_ctl2, schicken;
@@ -894,22 +904,18 @@ static void lpt_enable_backlight(struct intel_connector *connector)
 	I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 
 	/* This won't stick until the above enable. */
-	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+	intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 }
 
-static void pch_enable_backlight(struct intel_connector *connector)
+static void pch_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 drm_i915_private *dev_priv = to_i915(connector->base.dev);
 	struct intel_panel *panel = &connector->panel;
-	enum pipe pipe = intel_get_pipe_from_connector(connector);
-	enum transcoder cpu_transcoder;
+	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
 	u32 cpu_ctl2, pch_ctl1, pch_ctl2;
 
-	if (!WARN_ON_ONCE(pipe == INVALID_PIPE))
-		cpu_transcoder = intel_pipe_to_cpu_transcoder(dev_priv, pipe);
-	else
-		cpu_transcoder = TRANSCODER_EDP;
-
 	cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
 	if (cpu_ctl2 & BLM_PWM_ENABLE) {
 		DRM_DEBUG_KMS("cpu backlight already enabled\n");
@@ -933,7 +939,7 @@ static void pch_enable_backlight(struct intel_connector *connector)
 	I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
 
 	/* This won't stick until the above enable. */
-	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+	intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 
 	pch_ctl2 = panel->backlight.max << 16;
 	I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);
@@ -947,8 +953,10 @@ static void pch_enable_backlight(struct intel_connector *connector)
 	I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
 }
 
-static void i9xx_enable_backlight(struct intel_connector *connector)
+static void i9xx_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 drm_i915_private *dev_priv = to_i915(connector->base.dev);
 	struct intel_panel *panel = &connector->panel;
 	u32 ctl, freq;
@@ -973,7 +981,7 @@ static void i9xx_enable_backlight(struct intel_connector *connector)
 	POSTING_READ(BLC_PWM_CTL);
 
 	/* XXX: combine this into above write? */
-	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+	intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 
 	/*
 	 * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
@@ -984,16 +992,15 @@ static void i9xx_enable_backlight(struct intel_connector *connector)
 		I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
 }
 
-static void i965_enable_backlight(struct intel_connector *connector)
+static void i965_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 drm_i915_private *dev_priv = to_i915(connector->base.dev);
 	struct intel_panel *panel = &connector->panel;
-	enum pipe pipe = intel_get_pipe_from_connector(connector);
+	enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
 	u32 ctl, ctl2, freq;
 
-	if (WARN_ON_ONCE(pipe == INVALID_PIPE))
-		pipe = PIPE_A;
-
 	ctl2 = I915_READ(BLC_PWM_CTL2);
 	if (ctl2 & BLM_PWM_ENABLE) {
 		DRM_DEBUG_KMS("backlight already enabled\n");
@@ -1017,19 +1024,18 @@ static void i965_enable_backlight(struct intel_connector *connector)
 	POSTING_READ(BLC_PWM_CTL2);
 	I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
 
-	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+	intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 }
 
-static void vlv_enable_backlight(struct intel_connector *connector)
+static void vlv_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 drm_i915_private *dev_priv = to_i915(connector->base.dev);
 	struct intel_panel *panel = &connector->panel;
-	enum pipe pipe = intel_get_pipe_from_connector(connector);
+	enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
 	u32 ctl, ctl2;
 
-	if (WARN_ON(pipe != PIPE_A && pipe != PIPE_B))
-		return;
-
 	ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
 	if (ctl2 & BLM_PWM_ENABLE) {
 		DRM_DEBUG_KMS("backlight already enabled\n");
@@ -1041,7 +1047,7 @@ static void vlv_enable_backlight(struct intel_connector *connector)
 	I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);
 
 	/* XXX: combine this into above write? */
-	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+	intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 
 	ctl2 = 0;
 	if (panel->backlight.active_low_pwm)
@@ -1051,16 +1057,15 @@ static void vlv_enable_backlight(struct intel_connector *connector)
 	I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
 }
 
-static void bxt_enable_backlight(struct intel_connector *connector)
+static void bxt_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 drm_i915_private *dev_priv = to_i915(connector->base.dev);
 	struct intel_panel *panel = &connector->panel;
-	enum pipe pipe = intel_get_pipe_from_connector(connector);
+	enum pipe pipe = to_intel_crtc(crtc_state->base.crtc)->pipe;
 	u32 pwm_ctl, val;
 
-	if (WARN_ON_ONCE(pipe == INVALID_PIPE))
-		pipe = PIPE_A;
-
 	/* Controller 1 uses the utility pin. */
 	if (panel->backlight.controller == 1) {
 		val = I915_READ(UTIL_PIN_CTL);
@@ -1088,7 +1093,7 @@ static void bxt_enable_backlight(struct intel_connector *connector)
 	I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
 			panel->backlight.max);
 
-	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+	intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 
 	pwm_ctl = 0;
 	if (panel->backlight.active_low_pwm)
@@ -1100,8 +1105,10 @@ static void bxt_enable_backlight(struct intel_connector *connector)
 			pwm_ctl | BXT_BLC_PWM_ENABLE);
 }
 
-static void cnp_enable_backlight(struct intel_connector *connector)
+static void cnp_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 drm_i915_private *dev_priv = to_i915(connector->base.dev);
 	struct intel_panel *panel = &connector->panel;
 	u32 pwm_ctl;
@@ -1117,7 +1124,7 @@ static void cnp_enable_backlight(struct intel_connector *connector)
 	I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
 		   panel->backlight.max);
 
-	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+	intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 
 	pwm_ctl = 0;
 	if (panel->backlight.active_low_pwm)
@@ -1129,12 +1136,14 @@ static void cnp_enable_backlight(struct intel_connector *connector)
 		   pwm_ctl | BXT_BLC_PWM_ENABLE);
 }
 
-static void pwm_enable_backlight(struct intel_connector *connector)
+static void 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;
 
 	pwm_enable(panel->backlight.pwm);
-	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+	intel_panel_actually_set_backlight(conn_state, panel->backlight.level);
 }
 
 void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
@@ -1163,7 +1172,7 @@ void intel_panel_enable_backlight(const struct intel_crtc_state *crtc_state,
 						 panel->backlight.device->props.max_brightness);
 	}
 
-	panel->backlight.enable(connector);
+	panel->backlight.enable(crtc_state, conn_state);
 	panel->backlight.enabled = true;
 	if (panel->backlight.device)
 		panel->backlight.device->props.power = FB_BLANK_UNBLANK;
@@ -1181,7 +1190,7 @@ static int intel_backlight_device_update_status(struct backlight_device *bd)
 	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 	DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
 		      bd->props.brightness, bd->props.max_brightness);
-	intel_panel_set_backlight(connector, bd->props.brightness,
+	intel_panel_set_backlight(connector->base.state, bd->props.brightness,
 				  bd->props.max_brightness);
 
 	/*