[PATCH 1/6] drm/i915/cnp: Introduce Cannonpoint PCH.

[PATCH 1/6] drm/i915/cnp: Introduce Cannonpoint PCH.

[Rodrigo Vivi]

Most of south engine display that is in PCH is still the
same as SPT and KBP, except for this key differences:

- Backlight: Backlight programming changed in CNP PCH.
- Panel Power: Sligh programming changed in CNP PCH.
- GMBUS and GPIO: The pin mapping has changed in CNP PCH.

All of these changes follow more the BXT style.

v2: Update definition to use dev_priv isntead of dev (Tvrtko).

Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 3 +++
 drivers/gpu/drm/i915/i915_drv.h | 3 +++
 drivers/gpu/drm/i915/i915_irq.c | 6 ++++--
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 2fdfaf1..9e4c13e 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -216,6 +216,9 @@ static void intel_detect_pch(struct drm_i915_private *dev_priv)
 				DRM_DEBUG_KMS("Found KabyPoint PCH\n");
 				WARN_ON(!IS_SKYLAKE(dev_priv) &&
 					!IS_KABYLAKE(dev_priv));
+			} else if (id == INTEL_PCH_CNP_DEVICE_ID_TYPE) {
+				dev_priv->pch_type = PCH_CNP;
+				DRM_DEBUG_KMS("Found CannonPoint PCH\n");
 			} else if ((id == INTEL_PCH_P2X_DEVICE_ID_TYPE) ||
 				   (id == INTEL_PCH_P3X_DEVICE_ID_TYPE) ||
 				   ((id == INTEL_PCH_QEMU_DEVICE_ID_TYPE) &&
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index bde554e..0b82604 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1151,6 +1151,7 @@ enum intel_pch {
 	PCH_LPT,	/* Lynxpoint PCH */
 	PCH_SPT,        /* Sunrisepoint PCH */
 	PCH_KBP,        /* Kabypoint PCH */
+	PCH_CNP,        /* Cannonpoint PCH */
 	PCH_NOP,
 };
 
@@ -2966,11 +2967,13 @@ static inline struct scatterlist *__sg_next(struct scatterlist *sg)
 #define INTEL_PCH_SPT_DEVICE_ID_TYPE		0xA100
 #define INTEL_PCH_SPT_LP_DEVICE_ID_TYPE		0x9D00
 #define INTEL_PCH_KBP_DEVICE_ID_TYPE		0xA200
+#define INTEL_PCH_CNP_DEVICE_ID_TYPE		0xA300
 #define INTEL_PCH_P2X_DEVICE_ID_TYPE		0x7100
 #define INTEL_PCH_P3X_DEVICE_ID_TYPE		0x7000
 #define INTEL_PCH_QEMU_DEVICE_ID_TYPE		0x2900 /* qemu q35 has 2918 */
 
 #define INTEL_PCH_TYPE(dev_priv) ((dev_priv)->pch_type)
+#define HAS_PCH_CNP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_CNP)
 #define HAS_PCH_KBP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_KBP)
 #define HAS_PCH_SPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_SPT)
 #define HAS_PCH_LPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_LPT)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 7b7f55a..4cd9ee1 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2548,7 +2548,8 @@ static void bxt_hpd_irq_handler(struct drm_i915_private *dev_priv,
 			I915_WRITE(SDEIIR, iir);
 			ret = IRQ_HANDLED;
 
-			if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv))
+			if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv) ||
+			    HAS_PCH_CNP(dev_priv))
 				spt_irq_handler(dev_priv, iir);
 			else
 				cpt_irq_handler(dev_priv, iir);
@@ -4289,7 +4290,8 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
 		dev->driver->disable_vblank = gen8_disable_vblank;
 		if (IS_GEN9_LP(dev_priv))
 			dev_priv->display.hpd_irq_setup = bxt_hpd_irq_setup;
-		else if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv))
+		else if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv) ||
+			 HAS_PCH_CNP(dev_priv))
 			dev_priv->display.hpd_irq_setup = spt_hpd_irq_setup;
 		else
 			dev_priv->display.hpd_irq_setup = ilk_hpd_irq_setup;
-- 
1.9.1

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[PATCH 2/6] drm/i915/cnp: Add PCI ID for Cannonpoint LP PCH

[Rodrigo Vivi]

From: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>

The first two bytes of PCI ID for CNP_LP PCH are the same as that of
SPT_LP. We should really be looking at the first 9 bits instead of the
first 8 to identify platforms, although this seems to have not caused any
problems on earlier platforms. Introduce a 9 bit extended mask for SPT and
CNP while not touching the code for any of the other platforms.

v2: (Rodrigo) Make platform agnostic and fix commit message.

Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 8 +++++++-
 drivers/gpu/drm/i915/i915_drv.h | 4 ++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 9e4c13e..90b646c 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -170,6 +170,9 @@ static void intel_detect_pch(struct drm_i915_private *dev_priv)
 	while ((pch = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, pch))) {
 		if (pch->vendor == PCI_VENDOR_ID_INTEL) {
 			unsigned short id = pch->device & INTEL_PCH_DEVICE_ID_MASK;
+			unsigned short id_ext = pch->device &
+				INTEL_PCH_DEVICE_ID_MASK_EXT;
+
 			dev_priv->pch_id = id;
 
 			if (id == INTEL_PCH_IBX_DEVICE_ID_TYPE) {
@@ -206,7 +209,7 @@ static void intel_detect_pch(struct drm_i915_private *dev_priv)
 				DRM_DEBUG_KMS("Found SunrisePoint PCH\n");
 				WARN_ON(!IS_SKYLAKE(dev_priv) &&
 					!IS_KABYLAKE(dev_priv));
-			} else if (id == INTEL_PCH_SPT_LP_DEVICE_ID_TYPE) {
+			} else if (id_ext == INTEL_PCH_SPT_LP_DEVICE_ID_TYPE) {
 				dev_priv->pch_type = PCH_SPT;
 				DRM_DEBUG_KMS("Found SunrisePoint LP PCH\n");
 				WARN_ON(!IS_SKYLAKE(dev_priv) &&
@@ -219,6 +222,9 @@ static void intel_detect_pch(struct drm_i915_private *dev_priv)
 			} else if (id == INTEL_PCH_CNP_DEVICE_ID_TYPE) {
 				dev_priv->pch_type = PCH_CNP;
 				DRM_DEBUG_KMS("Found CannonPoint PCH\n");
+			} else if (id_ext == INTEL_PCH_CNP_LP_DEVICE_ID_TYPE) {
+				dev_priv->pch_type = PCH_CNP;
+				DRM_DEBUG_KMS("Found CannonPoint LP PCH\n");
 			} else if ((id == INTEL_PCH_P2X_DEVICE_ID_TYPE) ||
 				   (id == INTEL_PCH_P3X_DEVICE_ID_TYPE) ||
 				   ((id == INTEL_PCH_QEMU_DEVICE_ID_TYPE) &&
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 0b82604..c31c0cf 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2959,6 +2959,7 @@ static inline struct scatterlist *__sg_next(struct scatterlist *sg)
 #define HAS_POOLED_EU(dev_priv)	((dev_priv)->info.has_pooled_eu)
 
 #define INTEL_PCH_DEVICE_ID_MASK		0xff00
+#define INTEL_PCH_DEVICE_ID_MASK_EXT		0xff80
 #define INTEL_PCH_IBX_DEVICE_ID_TYPE		0x3b00
 #define INTEL_PCH_CPT_DEVICE_ID_TYPE		0x1c00
 #define INTEL_PCH_PPT_DEVICE_ID_TYPE		0x1e00
@@ -2968,12 +2969,15 @@ static inline struct scatterlist *__sg_next(struct scatterlist *sg)
 #define INTEL_PCH_SPT_LP_DEVICE_ID_TYPE		0x9D00
 #define INTEL_PCH_KBP_DEVICE_ID_TYPE		0xA200
 #define INTEL_PCH_CNP_DEVICE_ID_TYPE		0xA300
+#define INTEL_PCH_CNP_LP_DEVICE_ID_TYPE		0x9D80
 #define INTEL_PCH_P2X_DEVICE_ID_TYPE		0x7100
 #define INTEL_PCH_P3X_DEVICE_ID_TYPE		0x7000
 #define INTEL_PCH_QEMU_DEVICE_ID_TYPE		0x2900 /* qemu q35 has 2918 */
 
 #define INTEL_PCH_TYPE(dev_priv) ((dev_priv)->pch_type)
 #define HAS_PCH_CNP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_CNP)
+#define HAS_PCH_CNP_LP(dev_priv) \
+	((dev_priv)->pch_id == INTEL_PCH_CNP_LP_DEVICE_ID_TYPE)
 #define HAS_PCH_KBP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_KBP)
 #define HAS_PCH_SPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_SPT)
 #define HAS_PCH_LPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_LPT)
-- 
1.9.1

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[PATCH 3/6] drm/i915/cnp: Get/set proper Raw clock frequency on CNP.

[Rodrigo Vivi]

RAWCLK_FREQ register has changed for platforms with CNP+.

[29:26] This field provides the denominator for the fractional
	part of the microsecond counter divider.  The numerator
	is fixed at 1. Program this field to the denominator of
	the fractional portion of reference frequency minus one.
	If the fraction is 0, program to 0.
	0100b = Fraction .2 MHz = Fraction 1/5.
	0000b = Fraction .0 MHz.

[25:16] This field provides the integer part of the microsecond
	counter divider. Program this field to the integer portion
	of the reference frequenct minus one.

Also this register tells us that proper raw clock should be read
from SFUSE_STRAP and programmed to this register. Up to this point
on other platforms we are reading instead of programming it so
probably relying on whatever BIOS had configured here.

Now on let's follow the spec and also program this register
fetching the right value from SFUSE_STRAP as Spec tells us to do.

v2: Read from SFUSE_STRAP and Program RAWCLK_FREQ instead of
    reading the value relying someone else will program that
    for us.
v3: Add missing else. (Jani)
v4: Addressing all Ville's catches:
    Use macro for shift bits instead of defining shift.
    Remove shift from the cleaning bits with mask that already
    has it.
    Add missing I915_WRITE to actually write the reg.
    Stop using useless DIV_ROUND_* on divider that is exact
    dividion and use DIV_ROUND_CLOSEST for the fraction part.
v5: Remove useless Read-Modify-Write on raclk_freq reg. (Ville).
v6: Change is per PCH instead of per platform.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h    |  5 +++++
 drivers/gpu/drm/i915/intel_cdclk.c | 29 ++++++++++++++++++++++++++++-
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 231ee86..cb83fb7 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6838,6 +6838,10 @@ enum {
 #define  FDL_TP2_TIMER_SHIFT    10
 #define  FDL_TP2_TIMER_MASK     (3<<10)
 #define  RAWCLK_FREQ_MASK       0x3ff
+#define  CNP_RAWCLK_DIV_MASK	(0x3ff << 16)
+#define  CNP_RAWCLK_DIV(div)	((div) << 16)
+#define  CNP_RAWCLK_FRAC_MASK	(0xf << 26)
+#define  CNP_RAWCLK_FRAC(frac)	((frac) << 26)
 
 #define PCH_DPLL_TMR_CFG        _MMIO(0xc6208)
 
@@ -8141,6 +8145,7 @@ enum {
 /* SFUSE_STRAP */
 #define SFUSE_STRAP			_MMIO(0xc2014)
 #define  SFUSE_STRAP_FUSE_LOCK		(1<<13)
+#define  SFUSE_STRAP_RAW_FREQUENCY	(1<<8)
 #define  SFUSE_STRAP_DISPLAY_DISABLED	(1<<7)
 #define  SFUSE_STRAP_CRT_DISABLED	(1<<6)
 #define  SFUSE_STRAP_DDIB_DETECTED	(1<<2)
diff --git a/drivers/gpu/drm/i915/intel_cdclk.c b/drivers/gpu/drm/i915/intel_cdclk.c
index 2979297..634c89f 100644
--- a/drivers/gpu/drm/i915/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/intel_cdclk.c
@@ -1780,6 +1780,30 @@ void intel_update_cdclk(struct drm_i915_private *dev_priv)
 			   DIV_ROUND_UP(dev_priv->cdclk.hw.cdclk, 1000));
 }
 
+static int cnp_rawclk(struct drm_i915_private *dev_priv)
+{
+	u32 rawclk;
+	int divider, fraction;
+
+	if (I915_READ(SFUSE_STRAP) & SFUSE_STRAP_RAW_FREQUENCY) {
+		/* 24 MHz */
+		divider = 24000;
+		fraction = 0;
+	} else {
+		/* 19.2 MHz */
+		divider = 19000;
+		fraction = 200;
+	}
+
+	rawclk = CNP_RAWCLK_DIV((divider / 1000) - 1);
+	if (fraction)
+		rawclk |= CNP_RAWCLK_FRAC(DIV_ROUND_CLOSEST(1000,
+							    fraction) - 1);
+
+	I915_WRITE(PCH_RAWCLK_FREQ, rawclk);
+	return divider + fraction;
+}
+
 static int pch_rawclk(struct drm_i915_private *dev_priv)
 {
 	return (I915_READ(PCH_RAWCLK_FREQ) & RAWCLK_FREQ_MASK) * 1000;
@@ -1827,7 +1851,10 @@ static int g4x_hrawclk(struct drm_i915_private *dev_priv)
  */
 void intel_update_rawclk(struct drm_i915_private *dev_priv)
 {
-	if (HAS_PCH_SPLIT(dev_priv))
+
+	if (HAS_PCH_CNP(dev_priv))
+		dev_priv->rawclk_freq = cnp_rawclk(dev_priv);
+	else if (HAS_PCH_SPLIT(dev_priv))
 		dev_priv->rawclk_freq = pch_rawclk(dev_priv);
 	else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
 		dev_priv->rawclk_freq = vlv_hrawclk(dev_priv);
-- 
1.9.1

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[PATCH 4/6] drm/i915/cnp: Backlight support for CNP.

[Rodrigo Vivi]

Split out BXT and CNP's setup_backlight(),enable_backlight(),
disable_backlight() and hz_to_pwm() into
two separate functions instead of reusing BXT function.

Reuse set_backlight() and get_backlight() since they have
no reference to the utility pin.

v2: Reuse BXT functions with controller 0 instead of
    redefining it. (Jani).
    Use dev_priv->rawclk_freq instead of getting the value
    from SFUSE_STRAP.
v3: Avoid setup backligh controller along with hooks and
    fully reuse hooks setup as suggested by Jani.
v4: Clean up commit message.
v5: Implement per PCH instead per platform.

v6: Introduce a new function for CNP.(Jani and Ville)

v7: Squash the all CNP Backlight support patches into a
single patch. (Jani)

v8: Correct indentation, remove unneeded blank lines and
correct mail address (Jani).

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Ville Syrjala <ville.syrjala@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 drivers/gpu/drm/i915/intel_panel.c | 94 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index c8103f8..426e5e8 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -796,6 +796,19 @@ static void bxt_disable_backlight(struct intel_connector *connector)
 	}
 }
 
+static void cnp_disable_backlight(struct intel_connector *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);
+
+	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)
 {
 	struct intel_panel *panel = &connector->panel;
@@ -1086,6 +1099,36 @@ static void bxt_enable_backlight(struct intel_connector *connector)
 			pwm_ctl | BXT_BLC_PWM_ENABLE);
 }
 
+static void cnp_enable_backlight(struct intel_connector *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);
+	u32 pwm_ctl;
+
+	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+	if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
+		DRM_DEBUG_KMS("backlight already enabled\n");
+		pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
+		I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
+			   pwm_ctl);
+	}
+
+	I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
+		   panel->backlight.max);
+
+	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+
+	pwm_ctl = 0;
+	if (panel->backlight.active_low_pwm)
+		pwm_ctl |= BXT_BLC_PWM_POLARITY;
+
+	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
+	POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
+		   pwm_ctl | BXT_BLC_PWM_ENABLE);
+}
+
 static void pwm_enable_backlight(struct intel_connector *connector)
 {
 	struct intel_panel *panel = &connector->panel;
@@ -1250,6 +1293,18 @@ void intel_backlight_device_unregister(struct intel_connector *connector)
 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 
 /*
+ * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
+ *      Value is found in SFUSE_STRAP.
+ *      PWM increment = 1
+ */
+static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+
+	return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
+}
+
+/*
  * BXT: PWM clock frequency = 19.2 MHz.
  */
 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
@@ -1644,6 +1699,37 @@ static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe
 	return 0;
 }
 
+static int
+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;
+
+	panel->backlight.controller = dev_priv->vbt.backlight.controller;
+
+	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+
+	panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
+	panel->backlight.max =
+		I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
+
+	if (!panel->backlight.max)
+		panel->backlight.max = get_backlight_max_vbt(connector);
+
+	if (!panel->backlight.max)
+		return -ENODEV;
+
+	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.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
+
+	return 0;
+}
+
 static int pwm_setup_backlight(struct intel_connector *connector,
 			       enum pipe pipe)
 {
@@ -1760,6 +1846,14 @@ void intel_panel_destroy_backlight(struct drm_connector *connector)
 		panel->backlight.set = bxt_set_backlight;
 		panel->backlight.get = bxt_get_backlight;
 		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
+		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
+	} else if (HAS_PCH_CNP(dev_priv)) {
+		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;
 	} else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
 		   HAS_PCH_KBP(dev_priv)) {
 		panel->backlight.setup = lpt_setup_backlight;
-- 
1.9.1

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Re: [PATCH 4/6] drm/i915/cnp: Backlight support for CNP.

[kbuild test robot]

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Hi Rodrigo,

[auto build test ERROR on drm-intel/for-linux-next]
[also build test ERROR on v4.12-rc3 next-20170530]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Rodrigo-Vivi/drm-i915-cnp-Introduce-Cannonpoint-PCH/20170531-130947
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
config: i386-randconfig-x000-201722 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/gpu/drm/i915/intel_panel.c: In function 'cnp_enable_backlight':
>> drivers/gpu/drm/i915/intel_panel.c:1106:12: error: unused variable 'pipe' [-Werror=unused-variable]
     enum pipe pipe = intel_get_pipe_from_connector(connector);
               ^~~~
   cc1: all warnings being treated as errors

vim +/pipe +1106 drivers/gpu/drm/i915/intel_panel.c

  1100	}
  1101	
  1102	static void cnp_enable_backlight(struct intel_connector *connector)
  1103	{
  1104		struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
  1105		struct intel_panel *panel = &connector->panel;
> 1106		enum pipe pipe = intel_get_pipe_from_connector(connector);
  1107		u32 pwm_ctl;
  1108	
  1109		pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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[PATCH 5/6] drm/i915/cnp: add CNP gmbus support

[Rodrigo Vivi]

On CNP PCH based platforms the gmbus is on the south display that
is on PCH. The existing implementation for previous platforms
already covers the need for CNP expect for the pin pair configuration
that follows similar definitions that we had on BXT.

v2: Don't drop "_BXT" as the indicator of the first platform
    supporting this pin numbers. Suggested by Daniel.
v3: Add missing else and fix register table since CNP GPIO_CTL
    starts on 0xC5014.
v4: Fix pin number and map according to the current available VBT.
    Re-add pin 4 for port D. Lost during some rebase.

Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h   |  3 ++-
 drivers/gpu/drm/i915/intel_hdmi.c |  8 +++++---
 drivers/gpu/drm/i915/intel_i2c.c  | 20 ++++++++++++++++++--
 3 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index cb83fb7..1329420 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2626,9 +2626,10 @@ enum skl_disp_power_wells {
 #define   GMBUS_PIN_DPB		5 /* SDVO, HDMIB */
 #define   GMBUS_PIN_DPD		6 /* HDMID */
 #define   GMBUS_PIN_RESERVED	7 /* 7 reserved */
-#define   GMBUS_PIN_1_BXT	1
+#define   GMBUS_PIN_1_BXT	1 /* BXT+ (atom) and CNP+ (big core) */
 #define   GMBUS_PIN_2_BXT	2
 #define   GMBUS_PIN_3_BXT	3
+#define   GMBUS_PIN_4_CNP	4
 #define   GMBUS_NUM_PINS	7 /* including 0 */
 #define GMBUS1			_MMIO(dev_priv->gpio_mmio_base + 0x5104) /* command/status */
 #define   GMBUS_SW_CLR_INT	(1<<31)
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 41267ff..ec0779a 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1802,19 +1802,21 @@ static u8 intel_hdmi_ddc_pin(struct drm_i915_private *dev_priv,
 
 	switch (port) {
 	case PORT_B:
-		if (IS_GEN9_LP(dev_priv))
+		if (IS_GEN9_LP(dev_priv) || HAS_PCH_CNP(dev_priv))
 			ddc_pin = GMBUS_PIN_1_BXT;
 		else
 			ddc_pin = GMBUS_PIN_DPB;
 		break;
 	case PORT_C:
-		if (IS_GEN9_LP(dev_priv))
+		if (IS_GEN9_LP(dev_priv) || HAS_PCH_CNP(dev_priv))
 			ddc_pin = GMBUS_PIN_2_BXT;
 		else
 			ddc_pin = GMBUS_PIN_DPC;
 		break;
 	case PORT_D:
-		if (IS_CHERRYVIEW(dev_priv))
+		if (HAS_PCH_CNP(dev_priv))
+			ddc_pin = GMBUS_PIN_4_CNP;
+		else if (IS_CHERRYVIEW(dev_priv))
 			ddc_pin = GMBUS_PIN_DPD_CHV;
 		else
 			ddc_pin = GMBUS_PIN_DPD;
diff --git a/drivers/gpu/drm/i915/intel_i2c.c b/drivers/gpu/drm/i915/intel_i2c.c
index b6401e8..3eb4a91 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -68,11 +68,25 @@ struct gmbus_pin {
 	[GMBUS_PIN_3_BXT] = { "misc", GPIOD },
 };
 
+/*
+ * FIXME: Spec maps 3-misc-0xc541c and 4-portd-0xc5420.
+ * However, current available pre-prod VBT maps:
+ * portD to pin 3 using 0xc5420.
+ */
+static const struct gmbus_pin gmbus_pins_cnp[] = {
+	[GMBUS_PIN_1_BXT] = { "dpb", GPIOB },
+	[GMBUS_PIN_2_BXT] = { "dpc", GPIOC },
+	[GMBUS_PIN_3_BXT] = { "misc", GPIOE },
+	[GMBUS_PIN_4_CNP] = { "dpd", GPIOD },
+};
+
 /* pin is expected to be valid */
 static const struct gmbus_pin *get_gmbus_pin(struct drm_i915_private *dev_priv,
 					     unsigned int pin)
 {
-	if (IS_GEN9_LP(dev_priv))
+	if (HAS_PCH_CNP(dev_priv))
+		return &gmbus_pins_cnp[pin];
+	else if (IS_GEN9_LP(dev_priv))
 		return &gmbus_pins_bxt[pin];
 	else if (IS_GEN9_BC(dev_priv))
 		return &gmbus_pins_skl[pin];
@@ -87,7 +101,9 @@ bool intel_gmbus_is_valid_pin(struct drm_i915_private *dev_priv,
 {
 	unsigned int size;
 
-	if (IS_GEN9_LP(dev_priv))
+	if (HAS_PCH_CNP(dev_priv))
+		size = ARRAY_SIZE(gmbus_pins_cnp);
+	else if (IS_GEN9_LP(dev_priv))
 		size = ARRAY_SIZE(gmbus_pins_bxt);
 	else if (IS_GEN9_BC(dev_priv))
 		size = ARRAY_SIZE(gmbus_pins_skl);
-- 
1.9.1

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[PATCH 6/6] drm/i915/cnp: Panel Power sequence changes for CNP PCH.

[Rodrigo Vivi]

As for BXT, PP_DIVISOR was removed from CNP PCH and power
cycle delay has been moved to PP_CONTROL.

Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 58dca87..1a27c72 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -798,7 +798,7 @@ static void intel_pps_get_registers(struct drm_i915_private *dev_priv,
 	regs->pp_stat = PP_STATUS(pps_idx);
 	regs->pp_on = PP_ON_DELAYS(pps_idx);
 	regs->pp_off = PP_OFF_DELAYS(pps_idx);
-	if (!IS_GEN9_LP(dev_priv))
+	if (!IS_GEN9_LP(dev_priv) && !HAS_PCH_CNP(dev_priv))
 		regs->pp_div = PP_DIVISOR(pps_idx);
 }
 
@@ -5099,7 +5099,7 @@ static void intel_dp_init_panel_power_timestamps(struct intel_dp *intel_dp)
 
 	pp_on = I915_READ(regs.pp_on);
 	pp_off = I915_READ(regs.pp_off);
-	if (!IS_GEN9_LP(dev_priv)) {
+	if (!IS_GEN9_LP(dev_priv) && !HAS_PCH_CNP(dev_priv)) {
 		I915_WRITE(regs.pp_ctrl, pp_ctl);
 		pp_div = I915_READ(regs.pp_div);
 	}
@@ -5117,7 +5117,7 @@ static void intel_dp_init_panel_power_timestamps(struct intel_dp *intel_dp)
 	seq->t10 = (pp_off & PANEL_POWER_DOWN_DELAY_MASK) >>
 		   PANEL_POWER_DOWN_DELAY_SHIFT;
 
-	if (IS_GEN9_LP(dev_priv)) {
+	if (IS_GEN9_LP(dev_priv) || HAS_PCH_CNP(dev_priv)) {
 		u16 tmp = (pp_ctl & BXT_POWER_CYCLE_DELAY_MASK) >>
 			BXT_POWER_CYCLE_DELAY_SHIFT;
 		if (tmp > 0)
@@ -5274,7 +5274,7 @@ static void intel_dp_init_panel_power_timestamps(struct intel_dp *intel_dp)
 		 (seq->t10 << PANEL_POWER_DOWN_DELAY_SHIFT);
 	/* Compute the divisor for the pp clock, simply match the Bspec
 	 * formula. */
-	if (IS_GEN9_LP(dev_priv)) {
+	if (IS_GEN9_LP(dev_priv) || HAS_PCH_CNP(dev_priv)) {
 		pp_div = I915_READ(regs.pp_ctrl);
 		pp_div &= ~BXT_POWER_CYCLE_DELAY_MASK;
 		pp_div |= (DIV_ROUND_UP((seq->t11_t12 + 1), 1000)
@@ -5308,7 +5308,7 @@ static void intel_dp_init_panel_power_timestamps(struct intel_dp *intel_dp)
 	DRM_DEBUG_KMS("panel power sequencer register settings: PP_ON %#x, PP_OFF %#x, PP_DIV %#x\n",
 		      I915_READ(regs.pp_on),
 		      I915_READ(regs.pp_off),
-		      IS_GEN9_LP(dev_priv) ?
+		      (IS_GEN9_LP(dev_priv) || HAS_PCH_CNP(dev_priv)) ?
 		      (I915_READ(regs.pp_ctrl) & BXT_POWER_CYCLE_DELAY_MASK) :
 		      I915_READ(regs.pp_div));
 }
-- 
1.9.1

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Re: [PATCH 6/6] drm/i915/cnp: Panel Power sequence changes for CNP PCH.

[Rodrigo Vivi]

Jani, Daniel, could I merge the 5 patches already after CI respond?

I rebased and retest here on CNL.... But I'd like to start merging so
we unblock CFL as well, maybe on top of this CNP before CNL...

Jani, also I believe you would be the best reviewer for this 6th patch
here, could you please consider taking a look?

Thanks,
Rodrigo.

On Tue, May 30, 2017 at 2:53 PM, Rodrigo Vivi <rodrigo.vivi@intel.com> wrote:
> As for BXT, PP_DIVISOR was removed from CNP PCH and power
> cycle delay has been moved to PP_CONTROL.
>
> Cc: Jani Nikula <jani.nikula@intel.com>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 58dca87..1a27c72 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -798,7 +798,7 @@ static void intel_pps_get_registers(struct drm_i915_private *dev_priv,
>         regs->pp_stat = PP_STATUS(pps_idx);
>         regs->pp_on = PP_ON_DELAYS(pps_idx);
>         regs->pp_off = PP_OFF_DELAYS(pps_idx);
> -       if (!IS_GEN9_LP(dev_priv))
> +       if (!IS_GEN9_LP(dev_priv) && !HAS_PCH_CNP(dev_priv))
>                 regs->pp_div = PP_DIVISOR(pps_idx);
>  }
>
> @@ -5099,7 +5099,7 @@ static void intel_dp_init_panel_power_timestamps(struct intel_dp *intel_dp)
>
>         pp_on = I915_READ(regs.pp_on);
>         pp_off = I915_READ(regs.pp_off);
> -       if (!IS_GEN9_LP(dev_priv)) {
> +       if (!IS_GEN9_LP(dev_priv) && !HAS_PCH_CNP(dev_priv)) {
>                 I915_WRITE(regs.pp_ctrl, pp_ctl);
>                 pp_div = I915_READ(regs.pp_div);
>         }
> @@ -5117,7 +5117,7 @@ static void intel_dp_init_panel_power_timestamps(struct intel_dp *intel_dp)
>         seq->t10 = (pp_off & PANEL_POWER_DOWN_DELAY_MASK) >>
>                    PANEL_POWER_DOWN_DELAY_SHIFT;
>
> -       if (IS_GEN9_LP(dev_priv)) {
> +       if (IS_GEN9_LP(dev_priv) || HAS_PCH_CNP(dev_priv)) {
>                 u16 tmp = (pp_ctl & BXT_POWER_CYCLE_DELAY_MASK) >>
>                         BXT_POWER_CYCLE_DELAY_SHIFT;
>                 if (tmp > 0)
> @@ -5274,7 +5274,7 @@ static void intel_dp_init_panel_power_timestamps(struct intel_dp *intel_dp)
>                  (seq->t10 << PANEL_POWER_DOWN_DELAY_SHIFT);
>         /* Compute the divisor for the pp clock, simply match the Bspec
>          * formula. */
> -       if (IS_GEN9_LP(dev_priv)) {
> +       if (IS_GEN9_LP(dev_priv) || HAS_PCH_CNP(dev_priv)) {
>                 pp_div = I915_READ(regs.pp_ctrl);
>                 pp_div &= ~BXT_POWER_CYCLE_DELAY_MASK;
>                 pp_div |= (DIV_ROUND_UP((seq->t11_t12 + 1), 1000)
> @@ -5308,7 +5308,7 @@ static void intel_dp_init_panel_power_timestamps(struct intel_dp *intel_dp)
>         DRM_DEBUG_KMS("panel power sequencer register settings: PP_ON %#x, PP_OFF %#x, PP_DIV %#x\n",
>                       I915_READ(regs.pp_on),
>                       I915_READ(regs.pp_off),
> -                     IS_GEN9_LP(dev_priv) ?
> +                     (IS_GEN9_LP(dev_priv) || HAS_PCH_CNP(dev_priv)) ?
>                       (I915_READ(regs.pp_ctrl) & BXT_POWER_CYCLE_DELAY_MASK) :
>                       I915_READ(regs.pp_div));
>  }
> --
> 1.9.1
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx



-- 
Rodrigo Vivi
Blog: http://blog.vivi.eng.br
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✗ Fi.CI.BAT: failure for series starting with [1/6] drm/i915/cnp: Introduce Cannonpoint PCH.

[Patchwork]

== Series Details ==

Series: series starting with [1/6] drm/i915/cnp: Introduce Cannonpoint PCH.
URL   : https://patchwork.freedesktop.org/series/25066/
State : failure

== Summary ==

  CHK     include/config/kernel.release
  CHK     include/generated/uapi/linux/version.h
  CHK     include/generated/utsrelease.h
  CHK     include/generated/bounds.h
  CHK     include/generated/timeconst.h
  CHK     include/generated/asm-offsets.h
  CALL    scripts/checksyscalls.sh
  CHK     scripts/mod/devicetable-offsets.h
  CHK     include/generated/compile.h
  CHK     kernel/config_data.h
  CC [M]  drivers/gpu/drm/i915/intel_panel.o
drivers/gpu/drm/i915/intel_panel.c: In function ‘cnp_enable_backlight’:
drivers/gpu/drm/i915/intel_panel.c:1106:12: error: unused variable ‘pipe’ [-Werror=unused-variable]
  enum pipe pipe = intel_get_pipe_from_connector(connector);
            ^
cc1: all warnings being treated as errors
scripts/Makefile.build:302: recipe for target 'drivers/gpu/drm/i915/intel_panel.o' failed
make[4]: *** [drivers/gpu/drm/i915/intel_panel.o] Error 1
scripts/Makefile.build:561: recipe for target 'drivers/gpu/drm/i915' failed
make[3]: *** [drivers/gpu/drm/i915] Error 2
scripts/Makefile.build:561: recipe for target 'drivers/gpu/drm' failed
make[2]: *** [drivers/gpu/drm] Error 2
scripts/Makefile.build:561: recipe for target 'drivers/gpu' failed
make[1]: *** [drivers/gpu] Error 2
Makefile:1016: recipe for target 'drivers' failed
make: *** [drivers] Error 2

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[PATCH 1/6] drm/i915/cnp: Introduce Cannonpoint PCH.

[Rodrigo Vivi]

Most of south engine display that is in PCH is still the
same as SPT and KBP, except for this key differences:

- Backlight: Backlight programming changed in CNP PCH.
- Panel Power: Sligh programming changed in CNP PCH.
- GMBUS and GPIO: The pin mapping has changed in CNP PCH.

All of these changes follow more the BXT style.

v2: Update definition to use dev_priv isntead of dev (Tvrtko).

Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 3 +++
 drivers/gpu/drm/i915/i915_drv.h | 3 +++
 drivers/gpu/drm/i915/i915_irq.c | 6 ++++--
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 2fdfaf1..9e4c13e 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -216,6 +216,9 @@ static void intel_detect_pch(struct drm_i915_private *dev_priv)
 				DRM_DEBUG_KMS("Found KabyPoint PCH\n");
 				WARN_ON(!IS_SKYLAKE(dev_priv) &&
 					!IS_KABYLAKE(dev_priv));
+			} else if (id == INTEL_PCH_CNP_DEVICE_ID_TYPE) {
+				dev_priv->pch_type = PCH_CNP;
+				DRM_DEBUG_KMS("Found CannonPoint PCH\n");
 			} else if ((id == INTEL_PCH_P2X_DEVICE_ID_TYPE) ||
 				   (id == INTEL_PCH_P3X_DEVICE_ID_TYPE) ||
 				   ((id == INTEL_PCH_QEMU_DEVICE_ID_TYPE) &&
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index bde554e..0b82604 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1151,6 +1151,7 @@ enum intel_pch {
 	PCH_LPT,	/* Lynxpoint PCH */
 	PCH_SPT,        /* Sunrisepoint PCH */
 	PCH_KBP,        /* Kabypoint PCH */
+	PCH_CNP,        /* Cannonpoint PCH */
 	PCH_NOP,
 };
 
@@ -2966,11 +2967,13 @@ static inline struct scatterlist *__sg_next(struct scatterlist *sg)
 #define INTEL_PCH_SPT_DEVICE_ID_TYPE		0xA100
 #define INTEL_PCH_SPT_LP_DEVICE_ID_TYPE		0x9D00
 #define INTEL_PCH_KBP_DEVICE_ID_TYPE		0xA200
+#define INTEL_PCH_CNP_DEVICE_ID_TYPE		0xA300
 #define INTEL_PCH_P2X_DEVICE_ID_TYPE		0x7100
 #define INTEL_PCH_P3X_DEVICE_ID_TYPE		0x7000
 #define INTEL_PCH_QEMU_DEVICE_ID_TYPE		0x2900 /* qemu q35 has 2918 */
 
 #define INTEL_PCH_TYPE(dev_priv) ((dev_priv)->pch_type)
+#define HAS_PCH_CNP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_CNP)
 #define HAS_PCH_KBP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_KBP)
 #define HAS_PCH_SPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_SPT)
 #define HAS_PCH_LPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_LPT)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 7b7f55a..4cd9ee1 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2548,7 +2548,8 @@ static void bxt_hpd_irq_handler(struct drm_i915_private *dev_priv,
 			I915_WRITE(SDEIIR, iir);
 			ret = IRQ_HANDLED;
 
-			if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv))
+			if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv) ||
+			    HAS_PCH_CNP(dev_priv))
 				spt_irq_handler(dev_priv, iir);
 			else
 				cpt_irq_handler(dev_priv, iir);
@@ -4289,7 +4290,8 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
 		dev->driver->disable_vblank = gen8_disable_vblank;
 		if (IS_GEN9_LP(dev_priv))
 			dev_priv->display.hpd_irq_setup = bxt_hpd_irq_setup;
-		else if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv))
+		else if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv) ||
+			 HAS_PCH_CNP(dev_priv))
 			dev_priv->display.hpd_irq_setup = spt_hpd_irq_setup;
 		else
 			dev_priv->display.hpd_irq_setup = ilk_hpd_irq_setup;
-- 
1.9.1

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[PATCH 4/6] drm/i915/cnp: Backlight support for CNP.

[Rodrigo Vivi]

Split out BXT and CNP's setup_backlight(),enable_backlight(),
disable_backlight() and hz_to_pwm() into
two separate functions instead of reusing BXT function.

Reuse set_backlight() and get_backlight() since they have
no reference to the utility pin.

v2: Reuse BXT functions with controller 0 instead of
    redefining it. (Jani).
    Use dev_priv->rawclk_freq instead of getting the value
    from SFUSE_STRAP.
v3: Avoid setup backligh controller along with hooks and
    fully reuse hooks setup as suggested by Jani.
v4: Clean up commit message.
v5: Implement per PCH instead per platform.

v6: Introduce a new function for CNP.(Jani and Ville)

v7: Squash the all CNP Backlight support patches into a
single patch. (Jani)

v8: Correct indentation, remove unneeded blank lines and
correct mail address (Jani).

v9: Remove unused enum pipe. (by CI)

v10: Remove comment mentioning SFUSE_STRAP in a part of
     the code that we don't use it. (Jani)
     Make controller = 0 since current CNP has only one
     controller and put a comment mentioning why we
     reuse the BXT definitions and are keeping the
     controller = 0. (DK)
v11: Remove spurious line. (DK)

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Ville Syrjala <ville.syrjala@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 drivers/gpu/drm/i915/intel_panel.c | 96 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index c8103f8..4114cb3 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -796,6 +796,19 @@ static void bxt_disable_backlight(struct intel_connector *connector)
 	}
 }
 
+static void cnp_disable_backlight(struct intel_connector *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);
+
+	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)
 {
 	struct intel_panel *panel = &connector->panel;
@@ -1086,6 +1099,35 @@ static void bxt_enable_backlight(struct intel_connector *connector)
 			pwm_ctl | BXT_BLC_PWM_ENABLE);
 }
 
+static void cnp_enable_backlight(struct intel_connector *connector)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	struct intel_panel *panel = &connector->panel;
+	u32 pwm_ctl;
+
+	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+	if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
+		DRM_DEBUG_KMS("backlight already enabled\n");
+		pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
+		I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
+			   pwm_ctl);
+	}
+
+	I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
+		   panel->backlight.max);
+
+	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+
+	pwm_ctl = 0;
+	if (panel->backlight.active_low_pwm)
+		pwm_ctl |= BXT_BLC_PWM_POLARITY;
+
+	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
+	POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
+		   pwm_ctl | BXT_BLC_PWM_ENABLE);
+}
+
 static void pwm_enable_backlight(struct intel_connector *connector)
 {
 	struct intel_panel *panel = &connector->panel;
@@ -1250,6 +1292,17 @@ void intel_backlight_device_unregister(struct intel_connector *connector)
 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 
 /*
+ * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
+ *      PWM increment = 1
+ */
+static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+
+	return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
+}
+
+/*
  * BXT: PWM clock frequency = 19.2 MHz.
  */
 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
@@ -1644,6 +1697,42 @@ static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe
 	return 0;
 }
 
+static int
+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;
+
+	/*
+	 * CNP has the BXT implementation of backlight, but with only
+	 * one controller. Future platforms could have multiple controllers
+	 * so let's make this extensible and prepared for the future.
+	 */
+	panel->backlight.controller = 0;
+
+	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+
+	panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
+	panel->backlight.max =
+		I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
+
+	if (!panel->backlight.max)
+		panel->backlight.max = get_backlight_max_vbt(connector);
+
+	if (!panel->backlight.max)
+		return -ENODEV;
+
+	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.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
+
+	return 0;
+}
+
 static int pwm_setup_backlight(struct intel_connector *connector,
 			       enum pipe pipe)
 {
@@ -1760,6 +1849,13 @@ void intel_panel_destroy_backlight(struct drm_connector *connector)
 		panel->backlight.set = bxt_set_backlight;
 		panel->backlight.get = bxt_get_backlight;
 		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
+	} else if (HAS_PCH_CNP(dev_priv)) {
+		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;
 	} else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
 		   HAS_PCH_KBP(dev_priv)) {
 		panel->backlight.setup = lpt_setup_backlight;
-- 
1.9.1

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[PATCH 1/6] drm/i915/cnp: Introduce Cannonpoint PCH.

[Rodrigo Vivi]

Most of south engine display that is in PCH is still the
same as SPT and KBP, except for this key differences:

- Backlight: Backlight programming changed in CNP PCH.
- Panel Power: Sligh programming changed in CNP PCH.
- GMBUS and GPIO: The pin mapping has changed in CNP PCH.

All of these changes follow more the BXT style.

v2: Update definition to use dev_priv isntead of dev (Tvrtko).

Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 3 +++
 drivers/gpu/drm/i915/i915_drv.h | 3 +++
 drivers/gpu/drm/i915/i915_irq.c | 6 ++++--
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 2fdfaf1..9e4c13e 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -216,6 +216,9 @@ static void intel_detect_pch(struct drm_i915_private *dev_priv)
 				DRM_DEBUG_KMS("Found KabyPoint PCH\n");
 				WARN_ON(!IS_SKYLAKE(dev_priv) &&
 					!IS_KABYLAKE(dev_priv));
+			} else if (id == INTEL_PCH_CNP_DEVICE_ID_TYPE) {
+				dev_priv->pch_type = PCH_CNP;
+				DRM_DEBUG_KMS("Found CannonPoint PCH\n");
 			} else if ((id == INTEL_PCH_P2X_DEVICE_ID_TYPE) ||
 				   (id == INTEL_PCH_P3X_DEVICE_ID_TYPE) ||
 				   ((id == INTEL_PCH_QEMU_DEVICE_ID_TYPE) &&
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index bde554e..0b82604 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1151,6 +1151,7 @@ enum intel_pch {
 	PCH_LPT,	/* Lynxpoint PCH */
 	PCH_SPT,        /* Sunrisepoint PCH */
 	PCH_KBP,        /* Kabypoint PCH */
+	PCH_CNP,        /* Cannonpoint PCH */
 	PCH_NOP,
 };
 
@@ -2966,11 +2967,13 @@ static inline struct scatterlist *__sg_next(struct scatterlist *sg)
 #define INTEL_PCH_SPT_DEVICE_ID_TYPE		0xA100
 #define INTEL_PCH_SPT_LP_DEVICE_ID_TYPE		0x9D00
 #define INTEL_PCH_KBP_DEVICE_ID_TYPE		0xA200
+#define INTEL_PCH_CNP_DEVICE_ID_TYPE		0xA300
 #define INTEL_PCH_P2X_DEVICE_ID_TYPE		0x7100
 #define INTEL_PCH_P3X_DEVICE_ID_TYPE		0x7000
 #define INTEL_PCH_QEMU_DEVICE_ID_TYPE		0x2900 /* qemu q35 has 2918 */
 
 #define INTEL_PCH_TYPE(dev_priv) ((dev_priv)->pch_type)
+#define HAS_PCH_CNP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_CNP)
 #define HAS_PCH_KBP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_KBP)
 #define HAS_PCH_SPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_SPT)
 #define HAS_PCH_LPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_LPT)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 7b7f55a..4cd9ee1 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2548,7 +2548,8 @@ static void bxt_hpd_irq_handler(struct drm_i915_private *dev_priv,
 			I915_WRITE(SDEIIR, iir);
 			ret = IRQ_HANDLED;
 
-			if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv))
+			if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv) ||
+			    HAS_PCH_CNP(dev_priv))
 				spt_irq_handler(dev_priv, iir);
 			else
 				cpt_irq_handler(dev_priv, iir);
@@ -4289,7 +4290,8 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
 		dev->driver->disable_vblank = gen8_disable_vblank;
 		if (IS_GEN9_LP(dev_priv))
 			dev_priv->display.hpd_irq_setup = bxt_hpd_irq_setup;
-		else if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv))
+		else if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv) ||
+			 HAS_PCH_CNP(dev_priv))
 			dev_priv->display.hpd_irq_setup = spt_hpd_irq_setup;
 		else
 			dev_priv->display.hpd_irq_setup = ilk_hpd_irq_setup;
-- 
1.9.1

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[PATCH 4/6] drm/i915/cnp: Backlight support for CNP.

[Rodrigo Vivi]

Split out BXT and CNP's setup_backlight(),enable_backlight(),
disable_backlight() and hz_to_pwm() into
two separate functions instead of reusing BXT function.

Reuse set_backlight() and get_backlight() since they have
no reference to the utility pin.

v2: Reuse BXT functions with controller 0 instead of
    redefining it. (Jani).
    Use dev_priv->rawclk_freq instead of getting the value
    from SFUSE_STRAP.
v3: Avoid setup backligh controller along with hooks and
    fully reuse hooks setup as suggested by Jani.
v4: Clean up commit message.
v5: Implement per PCH instead per platform.

v6: Introduce a new function for CNP.(Jani and Ville)

v7: Squash the all CNP Backlight support patches into a
single patch. (Jani)

v8: Correct indentation, remove unneeded blank lines and
correct mail address (Jani).

v9: Remove unused enum pipe. (by CI)

v10: Remove comment mentioning SFUSE_STRAP in a part of
     the code that we don't use it. (Jani)
     Make controller = 0 since current CNP has only one
     controller and put a comment mentioning why we
     reuse the BXT definitions and are keeping the
     controller = 0. (DK)
v11: Remove spurious line. (DK)

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Ville Syrjala <ville.syrjala@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 drivers/gpu/drm/i915/intel_panel.c | 96 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index c8103f8..4114cb3 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -796,6 +796,19 @@ static void bxt_disable_backlight(struct intel_connector *connector)
 	}
 }
 
+static void cnp_disable_backlight(struct intel_connector *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);
+
+	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)
 {
 	struct intel_panel *panel = &connector->panel;
@@ -1086,6 +1099,35 @@ static void bxt_enable_backlight(struct intel_connector *connector)
 			pwm_ctl | BXT_BLC_PWM_ENABLE);
 }
 
+static void cnp_enable_backlight(struct intel_connector *connector)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	struct intel_panel *panel = &connector->panel;
+	u32 pwm_ctl;
+
+	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+	if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
+		DRM_DEBUG_KMS("backlight already enabled\n");
+		pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
+		I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
+			   pwm_ctl);
+	}
+
+	I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
+		   panel->backlight.max);
+
+	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+
+	pwm_ctl = 0;
+	if (panel->backlight.active_low_pwm)
+		pwm_ctl |= BXT_BLC_PWM_POLARITY;
+
+	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
+	POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
+		   pwm_ctl | BXT_BLC_PWM_ENABLE);
+}
+
 static void pwm_enable_backlight(struct intel_connector *connector)
 {
 	struct intel_panel *panel = &connector->panel;
@@ -1250,6 +1292,17 @@ void intel_backlight_device_unregister(struct intel_connector *connector)
 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 
 /*
+ * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
+ *      PWM increment = 1
+ */
+static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+
+	return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
+}
+
+/*
  * BXT: PWM clock frequency = 19.2 MHz.
  */
 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
@@ -1644,6 +1697,42 @@ static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe
 	return 0;
 }
 
+static int
+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;
+
+	/*
+	 * CNP has the BXT implementation of backlight, but with only
+	 * one controller. Future platforms could have multiple controllers
+	 * so let's make this extensible and prepared for the future.
+	 */
+	panel->backlight.controller = 0;
+
+	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+
+	panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
+	panel->backlight.max =
+		I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
+
+	if (!panel->backlight.max)
+		panel->backlight.max = get_backlight_max_vbt(connector);
+
+	if (!panel->backlight.max)
+		return -ENODEV;
+
+	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.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
+
+	return 0;
+}
+
 static int pwm_setup_backlight(struct intel_connector *connector,
 			       enum pipe pipe)
 {
@@ -1760,6 +1849,13 @@ void intel_panel_destroy_backlight(struct drm_connector *connector)
 		panel->backlight.set = bxt_set_backlight;
 		panel->backlight.get = bxt_get_backlight;
 		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
+	} else if (HAS_PCH_CNP(dev_priv)) {
+		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;
 	} else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
 		   HAS_PCH_KBP(dev_priv)) {
 		panel->backlight.setup = lpt_setup_backlight;
-- 
1.9.1

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Re: [PATCH 4/6] drm/i915/cnp: Backlight support for CNP.

[Pandiyan, Dhinakaran]

Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>

-DK

On Thu, 2017-06-01 at 15:33 -0700, Rodrigo Vivi wrote:
> Split out BXT and CNP's setup_backlight(),enable_backlight(),
> disable_backlight() and hz_to_pwm() into
> two separate functions instead of reusing BXT function.
> 
> Reuse set_backlight() and get_backlight() since they have
> no reference to the utility pin.
> 
> v2: Reuse BXT functions with controller 0 instead of
>     redefining it. (Jani).
>     Use dev_priv->rawclk_freq instead of getting the value
>     from SFUSE_STRAP.
> v3: Avoid setup backligh controller along with hooks and
>     fully reuse hooks setup as suggested by Jani.
> v4: Clean up commit message.
> v5: Implement per PCH instead per platform.
> 
> v6: Introduce a new function for CNP.(Jani and Ville)
> 
> v7: Squash the all CNP Backlight support patches into a
> single patch. (Jani)
> 
> v8: Correct indentation, remove unneeded blank lines and
> correct mail address (Jani).
> 
> v9: Remove unused enum pipe. (by CI)
> 
> v10: Remove comment mentioning SFUSE_STRAP in a part of
>      the code that we don't use it. (Jani)
>      Make controller = 0 since current CNP has only one
>      controller and put a comment mentioning why we
>      reuse the BXT definitions and are keeping the
>      controller = 0. (DK)
> v11: Remove spurious line. (DK)
> 
> Reviewed-by: Jani Nikula <jani.nikula@intel.com>
> Suggested-by: Jani Nikula <jani.nikula@intel.com>
> Suggested-by: Ville Syrjala <ville.syrjala@intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Jani Nikula <jani.nikula@intel.com>
> Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_panel.c | 96 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 96 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
> index c8103f8..4114cb3 100644
> --- a/drivers/gpu/drm/i915/intel_panel.c
> +++ b/drivers/gpu/drm/i915/intel_panel.c
> @@ -796,6 +796,19 @@ static void bxt_disable_backlight(struct intel_connector *connector)
>  	}
>  }
>  
> +static void cnp_disable_backlight(struct intel_connector *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);
> +
> +	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)
>  {
>  	struct intel_panel *panel = &connector->panel;
> @@ -1086,6 +1099,35 @@ static void bxt_enable_backlight(struct intel_connector *connector)
>  			pwm_ctl | BXT_BLC_PWM_ENABLE);
>  }
>  
> +static void cnp_enable_backlight(struct intel_connector *connector)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> +	struct intel_panel *panel = &connector->panel;
> +	u32 pwm_ctl;
> +
> +	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
> +	if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
> +		DRM_DEBUG_KMS("backlight already enabled\n");
> +		pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
> +		I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
> +			   pwm_ctl);
> +	}
> +
> +	I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
> +		   panel->backlight.max);
> +
> +	intel_panel_actually_set_backlight(connector, panel->backlight.level);
> +
> +	pwm_ctl = 0;
> +	if (panel->backlight.active_low_pwm)
> +		pwm_ctl |= BXT_BLC_PWM_POLARITY;
> +
> +	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
> +	POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
> +	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
> +		   pwm_ctl | BXT_BLC_PWM_ENABLE);
> +}
> +
>  static void pwm_enable_backlight(struct intel_connector *connector)
>  {
>  	struct intel_panel *panel = &connector->panel;
> @@ -1250,6 +1292,17 @@ void intel_backlight_device_unregister(struct intel_connector *connector)
>  #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
>  
>  /*
> + * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
> + *      PWM increment = 1
> + */
> +static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> +
> +	return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
> +}
> +
> +/*
>   * BXT: PWM clock frequency = 19.2 MHz.
>   */
>  static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
> @@ -1644,6 +1697,42 @@ static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe
>  	return 0;
>  }
>  
> +static int
> +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;
> +
> +	/*
> +	 * CNP has the BXT implementation of backlight, but with only
> +	 * one controller. Future platforms could have multiple controllers
> +	 * so let's make this extensible and prepared for the future.
> +	 */
> +	panel->backlight.controller = 0;
> +
> +	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
> +
> +	panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
> +	panel->backlight.max =
> +		I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
> +
> +	if (!panel->backlight.max)
> +		panel->backlight.max = get_backlight_max_vbt(connector);
> +
> +	if (!panel->backlight.max)
> +		return -ENODEV;
> +
> +	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.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
> +
> +	return 0;
> +}
> +
>  static int pwm_setup_backlight(struct intel_connector *connector,
>  			       enum pipe pipe)
>  {
> @@ -1760,6 +1849,13 @@ void intel_panel_destroy_backlight(struct drm_connector *connector)
>  		panel->backlight.set = bxt_set_backlight;
>  		panel->backlight.get = bxt_get_backlight;
>  		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
> +	} else if (HAS_PCH_CNP(dev_priv)) {
> +		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;
>  	} else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
>  		   HAS_PCH_KBP(dev_priv)) {
>  		panel->backlight.setup = lpt_setup_backlight;

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[PATCH 1/6] drm/i915/cnp: Introduce Cannonpoint PCH.

[Rodrigo Vivi]

Most of south engine display that is in PCH is still the
same as SPT and KBP, except for this key differences:

- Backlight: Backlight programming changed in CNP PCH.
- Panel Power: Sligh programming changed in CNP PCH.
- GMBUS and GPIO: The pin mapping has changed in CNP PCH.

All of these changes follow more the BXT style.

v2: Update definition to use dev_priv isntead of dev (Tvrtko).

Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 3 +++
 drivers/gpu/drm/i915/i915_drv.h | 3 +++
 drivers/gpu/drm/i915/i915_irq.c | 6 ++++--
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 2fdfaf1..9e4c13e 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -216,6 +216,9 @@ static void intel_detect_pch(struct drm_i915_private *dev_priv)
 				DRM_DEBUG_KMS("Found KabyPoint PCH\n");
 				WARN_ON(!IS_SKYLAKE(dev_priv) &&
 					!IS_KABYLAKE(dev_priv));
+			} else if (id == INTEL_PCH_CNP_DEVICE_ID_TYPE) {
+				dev_priv->pch_type = PCH_CNP;
+				DRM_DEBUG_KMS("Found CannonPoint PCH\n");
 			} else if ((id == INTEL_PCH_P2X_DEVICE_ID_TYPE) ||
 				   (id == INTEL_PCH_P3X_DEVICE_ID_TYPE) ||
 				   ((id == INTEL_PCH_QEMU_DEVICE_ID_TYPE) &&
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index bde554e..0b82604 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1151,6 +1151,7 @@ enum intel_pch {
 	PCH_LPT,	/* Lynxpoint PCH */
 	PCH_SPT,        /* Sunrisepoint PCH */
 	PCH_KBP,        /* Kabypoint PCH */
+	PCH_CNP,        /* Cannonpoint PCH */
 	PCH_NOP,
 };
 
@@ -2966,11 +2967,13 @@ static inline struct scatterlist *__sg_next(struct scatterlist *sg)
 #define INTEL_PCH_SPT_DEVICE_ID_TYPE		0xA100
 #define INTEL_PCH_SPT_LP_DEVICE_ID_TYPE		0x9D00
 #define INTEL_PCH_KBP_DEVICE_ID_TYPE		0xA200
+#define INTEL_PCH_CNP_DEVICE_ID_TYPE		0xA300
 #define INTEL_PCH_P2X_DEVICE_ID_TYPE		0x7100
 #define INTEL_PCH_P3X_DEVICE_ID_TYPE		0x7000
 #define INTEL_PCH_QEMU_DEVICE_ID_TYPE		0x2900 /* qemu q35 has 2918 */
 
 #define INTEL_PCH_TYPE(dev_priv) ((dev_priv)->pch_type)
+#define HAS_PCH_CNP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_CNP)
 #define HAS_PCH_KBP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_KBP)
 #define HAS_PCH_SPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_SPT)
 #define HAS_PCH_LPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_LPT)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 7b7f55a..4cd9ee1 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2548,7 +2548,8 @@ static void bxt_hpd_irq_handler(struct drm_i915_private *dev_priv,
 			I915_WRITE(SDEIIR, iir);
 			ret = IRQ_HANDLED;
 
-			if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv))
+			if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv) ||
+			    HAS_PCH_CNP(dev_priv))
 				spt_irq_handler(dev_priv, iir);
 			else
 				cpt_irq_handler(dev_priv, iir);
@@ -4289,7 +4290,8 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
 		dev->driver->disable_vblank = gen8_disable_vblank;
 		if (IS_GEN9_LP(dev_priv))
 			dev_priv->display.hpd_irq_setup = bxt_hpd_irq_setup;
-		else if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv))
+		else if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv) ||
+			 HAS_PCH_CNP(dev_priv))
 			dev_priv->display.hpd_irq_setup = spt_hpd_irq_setup;
 		else
 			dev_priv->display.hpd_irq_setup = ilk_hpd_irq_setup;
-- 
1.9.1

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[PATCH 4/6] drm/i915/cnp: Backlight support for CNP.

[Rodrigo Vivi]

Split out BXT and CNP's setup_backlight(),enable_backlight(),
disable_backlight() and hz_to_pwm() into
two separate functions instead of reusing BXT function.

Reuse set_backlight() and get_backlight() since they have
no reference to the utility pin.

v2: Reuse BXT functions with controller 0 instead of
    redefining it. (Jani).
    Use dev_priv->rawclk_freq instead of getting the value
    from SFUSE_STRAP.
v3: Avoid setup backligh controller along with hooks and
    fully reuse hooks setup as suggested by Jani.
v4: Clean up commit message.
v5: Implement per PCH instead per platform.

v6: Introduce a new function for CNP.(Jani and Ville)

v7: Squash the all CNP Backlight support patches into a
single patch. (Jani)

v8: Correct indentation, remove unneeded blank lines and
correct mail address (Jani).

v9: Remove unused enum pipe. (by CI)

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Ville Syrjala <ville.syrjala@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 drivers/gpu/drm/i915/intel_panel.c | 93 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index c8103f8..7e34a1b 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -796,6 +796,19 @@ static void bxt_disable_backlight(struct intel_connector *connector)
 	}
 }
 
+static void cnp_disable_backlight(struct intel_connector *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);
+
+	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)
 {
 	struct intel_panel *panel = &connector->panel;
@@ -1086,6 +1099,35 @@ static void bxt_enable_backlight(struct intel_connector *connector)
 			pwm_ctl | BXT_BLC_PWM_ENABLE);
 }
 
+static void cnp_enable_backlight(struct intel_connector *connector)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	struct intel_panel *panel = &connector->panel;
+	u32 pwm_ctl;
+
+	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+	if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
+		DRM_DEBUG_KMS("backlight already enabled\n");
+		pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
+		I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
+			   pwm_ctl);
+	}
+
+	I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
+		   panel->backlight.max);
+
+	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+
+	pwm_ctl = 0;
+	if (panel->backlight.active_low_pwm)
+		pwm_ctl |= BXT_BLC_PWM_POLARITY;
+
+	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
+	POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
+		   pwm_ctl | BXT_BLC_PWM_ENABLE);
+}
+
 static void pwm_enable_backlight(struct intel_connector *connector)
 {
 	struct intel_panel *panel = &connector->panel;
@@ -1250,6 +1292,18 @@ void intel_backlight_device_unregister(struct intel_connector *connector)
 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 
 /*
+ * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
+ *      Value is found in SFUSE_STRAP.
+ *      PWM increment = 1
+ */
+static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+
+	return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
+}
+
+/*
  * BXT: PWM clock frequency = 19.2 MHz.
  */
 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
@@ -1644,6 +1698,37 @@ static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe
 	return 0;
 }
 
+static int
+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;
+
+	panel->backlight.controller = dev_priv->vbt.backlight.controller;
+
+	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+
+	panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
+	panel->backlight.max =
+		I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
+
+	if (!panel->backlight.max)
+		panel->backlight.max = get_backlight_max_vbt(connector);
+
+	if (!panel->backlight.max)
+		return -ENODEV;
+
+	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.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
+
+	return 0;
+}
+
 static int pwm_setup_backlight(struct intel_connector *connector,
 			       enum pipe pipe)
 {
@@ -1760,6 +1845,14 @@ void intel_panel_destroy_backlight(struct drm_connector *connector)
 		panel->backlight.set = bxt_set_backlight;
 		panel->backlight.get = bxt_get_backlight;
 		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
+		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
+	} else if (HAS_PCH_CNP(dev_priv)) {
+		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;
 	} else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
 		   HAS_PCH_KBP(dev_priv)) {
 		panel->backlight.setup = lpt_setup_backlight;
-- 
1.9.1

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Re: [PATCH 4/6] drm/i915/cnp: Backlight support for CNP.

[Jani Nikula]

On Wed, 31 May 2017, Rodrigo Vivi <rodrigo.vivi@intel.com> wrote:
> Split out BXT and CNP's setup_backlight(),enable_backlight(),
> disable_backlight() and hz_to_pwm() into
> two separate functions instead of reusing BXT function.
>
> Reuse set_backlight() and get_backlight() since they have
> no reference to the utility pin.
>
> v2: Reuse BXT functions with controller 0 instead of
>     redefining it. (Jani).
>     Use dev_priv->rawclk_freq instead of getting the value
>     from SFUSE_STRAP.
> v3: Avoid setup backligh controller along with hooks and
>     fully reuse hooks setup as suggested by Jani.
> v4: Clean up commit message.
> v5: Implement per PCH instead per platform.
>
> v6: Introduce a new function for CNP.(Jani and Ville)
>
> v7: Squash the all CNP Backlight support patches into a
> single patch. (Jani)
>
> v8: Correct indentation, remove unneeded blank lines and
> correct mail address (Jani).
>
> v9: Remove unused enum pipe. (by CI)
>
> Reviewed-by: Jani Nikula <jani.nikula@intel.com>
> Suggested-by: Jani Nikula <jani.nikula@intel.com>
> Suggested-by: Ville Syrjala <ville.syrjala@intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Jani Nikula <jani.nikula@intel.com>
> Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_panel.c | 93 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 93 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
> index c8103f8..7e34a1b 100644
> --- a/drivers/gpu/drm/i915/intel_panel.c
> +++ b/drivers/gpu/drm/i915/intel_panel.c
> @@ -796,6 +796,19 @@ static void bxt_disable_backlight(struct intel_connector *connector)
>  	}
>  }
>  
> +static void cnp_disable_backlight(struct intel_connector *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);
> +
> +	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)
>  {
>  	struct intel_panel *panel = &connector->panel;
> @@ -1086,6 +1099,35 @@ static void bxt_enable_backlight(struct intel_connector *connector)
>  			pwm_ctl | BXT_BLC_PWM_ENABLE);
>  }
>  
> +static void cnp_enable_backlight(struct intel_connector *connector)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> +	struct intel_panel *panel = &connector->panel;
> +	u32 pwm_ctl;
> +
> +	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
> +	if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
> +		DRM_DEBUG_KMS("backlight already enabled\n");
> +		pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
> +		I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
> +			   pwm_ctl);
> +	}
> +
> +	I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
> +		   panel->backlight.max);
> +
> +	intel_panel_actually_set_backlight(connector, panel->backlight.level);
> +
> +	pwm_ctl = 0;
> +	if (panel->backlight.active_low_pwm)
> +		pwm_ctl |= BXT_BLC_PWM_POLARITY;
> +
> +	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
> +	POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
> +	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
> +		   pwm_ctl | BXT_BLC_PWM_ENABLE);
> +}
> +
>  static void pwm_enable_backlight(struct intel_connector *connector)
>  {
>  	struct intel_panel *panel = &connector->panel;
> @@ -1250,6 +1292,18 @@ void intel_backlight_device_unregister(struct intel_connector *connector)
>  #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
>  
>  /*
> + * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
> + *      Value is found in SFUSE_STRAP.

This is confusing because it's not taken into account in the code.

BR,
Jani.

> + *      PWM increment = 1
> + */
> +static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> +
> +	return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
> +}
> +
> +/*
>   * BXT: PWM clock frequency = 19.2 MHz.
>   */
>  static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
> @@ -1644,6 +1698,37 @@ static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe
>  	return 0;
>  }
>  
> +static int
> +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;
> +
> +	panel->backlight.controller = dev_priv->vbt.backlight.controller;
> +
> +	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
> +
> +	panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
> +	panel->backlight.max =
> +		I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
> +
> +	if (!panel->backlight.max)
> +		panel->backlight.max = get_backlight_max_vbt(connector);
> +
> +	if (!panel->backlight.max)
> +		return -ENODEV;
> +
> +	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.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
> +
> +	return 0;
> +}
> +
>  static int pwm_setup_backlight(struct intel_connector *connector,
>  			       enum pipe pipe)
>  {
> @@ -1760,6 +1845,14 @@ void intel_panel_destroy_backlight(struct drm_connector *connector)
>  		panel->backlight.set = bxt_set_backlight;
>  		panel->backlight.get = bxt_get_backlight;
>  		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
> +		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
> +	} else if (HAS_PCH_CNP(dev_priv)) {
> +		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;
>  	} else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
>  		   HAS_PCH_KBP(dev_priv)) {
>  		panel->backlight.setup = lpt_setup_backlight;

-- 
Jani Nikula, Intel Open Source Technology Center
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[PATCH 1/6] drm/i915/cnp: Introduce Cannonpoint PCH.

[Rodrigo Vivi]

Most of south engine display that is in PCH is still the
same as SPT and KBP, except for this key differences:

- Backlight: Backlight programming changed in CNP PCH.
- Panel Power: Sligh programming changed in CNP PCH.
- GMBUS and GPIO: The pin mapping has changed in CNP PCH.

All of these changes follow more the BXT style.

v2: Update definition to use dev_priv isntead of dev (Tvrtko).

Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 3 +++
 drivers/gpu/drm/i915/i915_drv.h | 3 +++
 drivers/gpu/drm/i915/i915_irq.c | 6 ++++--
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 2fdfaf1..9e4c13e 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -216,6 +216,9 @@ static void intel_detect_pch(struct drm_i915_private *dev_priv)
 				DRM_DEBUG_KMS("Found KabyPoint PCH\n");
 				WARN_ON(!IS_SKYLAKE(dev_priv) &&
 					!IS_KABYLAKE(dev_priv));
+			} else if (id == INTEL_PCH_CNP_DEVICE_ID_TYPE) {
+				dev_priv->pch_type = PCH_CNP;
+				DRM_DEBUG_KMS("Found CannonPoint PCH\n");
 			} else if ((id == INTEL_PCH_P2X_DEVICE_ID_TYPE) ||
 				   (id == INTEL_PCH_P3X_DEVICE_ID_TYPE) ||
 				   ((id == INTEL_PCH_QEMU_DEVICE_ID_TYPE) &&
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index bde554e..0b82604 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1151,6 +1151,7 @@ enum intel_pch {
 	PCH_LPT,	/* Lynxpoint PCH */
 	PCH_SPT,        /* Sunrisepoint PCH */
 	PCH_KBP,        /* Kabypoint PCH */
+	PCH_CNP,        /* Cannonpoint PCH */
 	PCH_NOP,
 };
 
@@ -2966,11 +2967,13 @@ static inline struct scatterlist *__sg_next(struct scatterlist *sg)
 #define INTEL_PCH_SPT_DEVICE_ID_TYPE		0xA100
 #define INTEL_PCH_SPT_LP_DEVICE_ID_TYPE		0x9D00
 #define INTEL_PCH_KBP_DEVICE_ID_TYPE		0xA200
+#define INTEL_PCH_CNP_DEVICE_ID_TYPE		0xA300
 #define INTEL_PCH_P2X_DEVICE_ID_TYPE		0x7100
 #define INTEL_PCH_P3X_DEVICE_ID_TYPE		0x7000
 #define INTEL_PCH_QEMU_DEVICE_ID_TYPE		0x2900 /* qemu q35 has 2918 */
 
 #define INTEL_PCH_TYPE(dev_priv) ((dev_priv)->pch_type)
+#define HAS_PCH_CNP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_CNP)
 #define HAS_PCH_KBP(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_KBP)
 #define HAS_PCH_SPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_SPT)
 #define HAS_PCH_LPT(dev_priv) (INTEL_PCH_TYPE(dev_priv) == PCH_LPT)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 7b7f55a..4cd9ee1 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2548,7 +2548,8 @@ static void bxt_hpd_irq_handler(struct drm_i915_private *dev_priv,
 			I915_WRITE(SDEIIR, iir);
 			ret = IRQ_HANDLED;
 
-			if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv))
+			if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv) ||
+			    HAS_PCH_CNP(dev_priv))
 				spt_irq_handler(dev_priv, iir);
 			else
 				cpt_irq_handler(dev_priv, iir);
@@ -4289,7 +4290,8 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
 		dev->driver->disable_vblank = gen8_disable_vblank;
 		if (IS_GEN9_LP(dev_priv))
 			dev_priv->display.hpd_irq_setup = bxt_hpd_irq_setup;
-		else if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv))
+		else if (HAS_PCH_SPT(dev_priv) || HAS_PCH_KBP(dev_priv) ||
+			 HAS_PCH_CNP(dev_priv))
 			dev_priv->display.hpd_irq_setup = spt_hpd_irq_setup;
 		else
 			dev_priv->display.hpd_irq_setup = ilk_hpd_irq_setup;
-- 
1.9.1

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[PATCH 4/6] drm/i915/cnp: Backlight support for CNP.

[Rodrigo Vivi]

Split out BXT and CNP's setup_backlight(),enable_backlight(),
disable_backlight() and hz_to_pwm() into
two separate functions instead of reusing BXT function.

Reuse set_backlight() and get_backlight() since they have
no reference to the utility pin.

v2: Reuse BXT functions with controller 0 instead of
    redefining it. (Jani).
    Use dev_priv->rawclk_freq instead of getting the value
    from SFUSE_STRAP.
v3: Avoid setup backligh controller along with hooks and
    fully reuse hooks setup as suggested by Jani.
v4: Clean up commit message.
v5: Implement per PCH instead per platform.

v6: Introduce a new function for CNP.(Jani and Ville)

v7: Squash the all CNP Backlight support patches into a
single patch. (Jani)

v8: Correct indentation, remove unneeded blank lines and
correct mail address (Jani).

v9: Remove unused enum pipe. (by CI)

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Ville Syrjala <ville.syrjala@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 drivers/gpu/drm/i915/intel_panel.c | 93 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index c8103f8..7e34a1b 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -796,6 +796,19 @@ static void bxt_disable_backlight(struct intel_connector *connector)
 	}
 }
 
+static void cnp_disable_backlight(struct intel_connector *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);
+
+	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)
 {
 	struct intel_panel *panel = &connector->panel;
@@ -1086,6 +1099,35 @@ static void bxt_enable_backlight(struct intel_connector *connector)
 			pwm_ctl | BXT_BLC_PWM_ENABLE);
 }
 
+static void cnp_enable_backlight(struct intel_connector *connector)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	struct intel_panel *panel = &connector->panel;
+	u32 pwm_ctl;
+
+	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+	if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
+		DRM_DEBUG_KMS("backlight already enabled\n");
+		pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
+		I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
+			   pwm_ctl);
+	}
+
+	I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
+		   panel->backlight.max);
+
+	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+
+	pwm_ctl = 0;
+	if (panel->backlight.active_low_pwm)
+		pwm_ctl |= BXT_BLC_PWM_POLARITY;
+
+	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
+	POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
+		   pwm_ctl | BXT_BLC_PWM_ENABLE);
+}
+
 static void pwm_enable_backlight(struct intel_connector *connector)
 {
 	struct intel_panel *panel = &connector->panel;
@@ -1250,6 +1292,18 @@ void intel_backlight_device_unregister(struct intel_connector *connector)
 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 
 /*
+ * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
+ *      Value is found in SFUSE_STRAP.
+ *      PWM increment = 1
+ */
+static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+
+	return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
+}
+
+/*
  * BXT: PWM clock frequency = 19.2 MHz.
  */
 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
@@ -1644,6 +1698,37 @@ static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe
 	return 0;
 }
 
+static int
+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;
+
+	panel->backlight.controller = dev_priv->vbt.backlight.controller;
+
+	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+
+	panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
+	panel->backlight.max =
+		I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
+
+	if (!panel->backlight.max)
+		panel->backlight.max = get_backlight_max_vbt(connector);
+
+	if (!panel->backlight.max)
+		return -ENODEV;
+
+	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.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
+
+	return 0;
+}
+
 static int pwm_setup_backlight(struct intel_connector *connector,
 			       enum pipe pipe)
 {
@@ -1760,6 +1845,14 @@ void intel_panel_destroy_backlight(struct drm_connector *connector)
 		panel->backlight.set = bxt_set_backlight;
 		panel->backlight.get = bxt_get_backlight;
 		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
+		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
+	} else if (HAS_PCH_CNP(dev_priv)) {
+		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;
 	} else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
 		   HAS_PCH_KBP(dev_priv)) {
 		panel->backlight.setup = lpt_setup_backlight;
-- 
1.9.1

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[PATCH 0/6] Cannonpoint Enabling Patches

[Anusha Srivatsa]

Rebased Rodrigo's patche series that enabled Cannonpoint 
support.
https://patchwork.freedesktop.org/project/intel-gfx/patches/?submitter=13413&state=&q=cnl&archive=&delegate

v2: rebased. fix compilation issues.

Dhinakaran Pandiyan (1):
  drm/i915/cnp: Add PCI ID for Cannonpoint LP PCH

Rodrigo Vivi (5):
  drm/i915/cnp: Introduce Cannonpoint PCH.
  drm/i915/cnp: Get/set proper Raw clock frequency on CNP.
  drm/i915/cnp: Backlight support for CNP.
  drm/i915/cnp: add CNP gmbus support
  drm/i915/cnp: Panel Power sequence changes for CNP PCH.

 drivers/gpu/drm/i915/i915_drv.c    | 10 +++-
 drivers/gpu/drm/i915/i915_drv.h    |  7 +++
 drivers/gpu/drm/i915/i915_irq.c    |  6 ++-
 drivers/gpu/drm/i915/i915_reg.h    |  8 +++-
 drivers/gpu/drm/i915/intel_cdclk.c | 29 +++++++++++-
 drivers/gpu/drm/i915/intel_dp.c    | 10 ++--
 drivers/gpu/drm/i915/intel_hdmi.c  |  8 ++--
 drivers/gpu/drm/i915/intel_i2c.c   | 20 +++++++-
 drivers/gpu/drm/i915/intel_panel.c | 94 ++++++++++++++++++++++++++++++++++++++
 9 files changed, 177 insertions(+), 15 deletions(-)

-- 
2.7.4

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[PATCH 4/6] drm/i915/cnp: Backlight support for CNP.

[Anusha Srivatsa]

From: Rodrigo Vivi <rodrigo.vivi@intel.com>

Split out BXT and CNP's setup_backlight(),enable_backlight(),
disable_backlight() and hz_to_pwm() into
two separate functions instead of reusing BXT function.

Reuse set_backlight() and get_backlight() since they have
no reference to the utility pin.

v2: Reuse BXT functions with controller 0 instead of
    redefining it. (Jani).
    Use dev_priv->rawclk_freq instead of getting the value
    from SFUSE_STRAP.
v3: Avoid setup backligh controller along with hooks and
    fully reuse hooks setup as suggested by Jani.
v4: Clean up commit message.
v5: Implement per PCH instead per platform.

v6: Introduce a new function for CNP.(Jani and Ville)

v7: Squash the all CNP Backlight support patches into a
single patch. (Jani)

v8: Correct indentation, remove unneeded blank lines and
correct mail address (Jani).

v9: rebased.

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Ville Syrjala <ville.syrjala@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 drivers/gpu/drm/i915/intel_panel.c | 92 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index cb50c52..4830ec2 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -796,6 +796,19 @@ static void bxt_disable_backlight(struct intel_connector *connector)
 	}
 }
 
+static void cnp_disable_backlight(struct intel_connector *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);
+
+	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)
 {
 	struct intel_panel *panel = &connector->panel;
@@ -1076,6 +1089,35 @@ static void bxt_enable_backlight(struct intel_connector *connector)
 			pwm_ctl | BXT_BLC_PWM_ENABLE);
 }
 
+static void cnp_enable_backlight(struct intel_connector *connector)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+	struct intel_panel *panel = &connector->panel;
+	u32 pwm_ctl;
+
+	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+	if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
+		DRM_DEBUG_KMS("backlight already enabled\n");
+		pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
+		I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
+			   pwm_ctl);
+	}
+
+	I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
+		   panel->backlight.max);
+
+	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+
+	pwm_ctl = 0;
+	if (panel->backlight.active_low_pwm)
+		pwm_ctl |= BXT_BLC_PWM_POLARITY;
+
+	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
+	POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
+		   pwm_ctl | BXT_BLC_PWM_ENABLE);
+}
+
 static void pwm_enable_backlight(struct intel_connector *connector)
 {
 	struct intel_panel *panel = &connector->panel;
@@ -1239,6 +1281,18 @@ void intel_backlight_device_unregister(struct intel_connector *connector)
 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 
 /*
+ * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
+ *      Value is found in SFUSE_STRAP.
+ *      PWM increment = 1
+ */
+static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+
+	return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
+}
+
+/*
  * BXT: PWM clock frequency = 19.2 MHz.
  */
 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
@@ -1633,6 +1687,37 @@ bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
 	return 0;
 }
 
+static int
+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;
+
+	panel->backlight.controller = dev_priv->vbt.backlight.controller;
+
+	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+
+	panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
+	panel->backlight.max =
+		I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
+
+	if (!panel->backlight.max)
+		panel->backlight.max = get_backlight_max_vbt(connector);
+
+	if (!panel->backlight.max)
+		return -ENODEV;
+
+	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.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
+
+	return 0;
+}
+
 static int pwm_setup_backlight(struct intel_connector *connector,
 			       enum pipe pipe)
 {
@@ -1749,6 +1834,13 @@ intel_panel_init_backlight_funcs(struct intel_panel *panel)
 		panel->backlight.set = bxt_set_backlight;
 		panel->backlight.get = bxt_get_backlight;
 		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
+	} else if (HAS_PCH_CNP(dev_priv)) {
+		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;
 	} else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
 		   HAS_PCH_KBP(dev_priv)) {
 		panel->backlight.setup = lpt_setup_backlight;
-- 
2.7.4

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[PATCH 0/6] Cannonpoint Enabling Patches

[Anusha Srivatsa]

Rebased Rodrigo's patche series that enabled Cannonpoint 
support.
https://patchwork.freedesktop.org/project/intel-gfx/patches/?submitter=13413&state=&q=cnl&archive=&delegate


Dhinakaran Pandiyan (1):
  drm/i915/cnp: Add PCI ID for Cannonpoint LP PCH

Rodrigo Vivi (5):
  drm/i915/cnp: Introduce Cannonpoint PCH.
  drm/i915/cnp: Get/set proper Raw clock frequency on CNP.
  drm/i915/cnp: Backlight support for CNP.
  drm/i915/cnp: add CNP gmbus support
  drm/i915/cnp: Panel Power sequence changes for CNP PCH.

 drivers/gpu/drm/i915/i915_drv.c    | 10 +++-
 drivers/gpu/drm/i915/i915_drv.h    |  7 +++
 drivers/gpu/drm/i915/i915_irq.c    |  6 ++-
 drivers/gpu/drm/i915/i915_reg.h    |  8 +++-
 drivers/gpu/drm/i915/intel_cdclk.c | 29 +++++++++++-
 drivers/gpu/drm/i915/intel_dp.c    | 10 ++--
 drivers/gpu/drm/i915/intel_hdmi.c  |  8 ++--
 drivers/gpu/drm/i915/intel_i2c.c   | 20 +++++++-
 drivers/gpu/drm/i915/intel_panel.c | 94 ++++++++++++++++++++++++++++++++++++++
 9 files changed, 177 insertions(+), 15 deletions(-)

-- 
2.7.4

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[PATCH 4/6] drm/i915/cnp: Backlight support for CNP.

[Anusha Srivatsa]

From: Rodrigo Vivi <rodrigo.vivi@intel.com>

Split out BXT and CNP's setup_backlight(),enable_backlight(),
disable_backlight() and hz_to_pwm() into
two separate functions instead of reusing BXT function.

Reuse set_backlight() and get_backlight() since they have
no reference to the utility pin.

v2: Reuse BXT functions with controller 0 instead of
    redefining it. (Jani).
    Use dev_priv->rawclk_freq instead of getting the value
    from SFUSE_STRAP.
v3: Avoid setup backligh controller along with hooks and
    fully reuse hooks setup as suggested by Jani.
v4: Clean up commit message.
v5: Implement per PCH instead per platform.

v6: Introduce a new function for CNP.(Jani and Ville)

v7: Squash the all CNP Backlight support patches into a
single patch. (Jani)

v8: Correct indentation, remove unneeded blank lines and
correct mail address (Jani).

Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Jani Nikula <jani.nikula@intel.com>
Suggested-by: Ville Syrjala <ville.syrjala@intel.com>
Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 drivers/gpu/drm/i915/intel_panel.c | 94 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index cb50c52..22da1e2 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -796,6 +796,19 @@ static void bxt_disable_backlight(struct intel_connector *connector)
 	}
 }
 
+static void cnp_disable_backlight(struct intel_connector *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);
+
+	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)
 {
 	struct intel_panel *panel = &connector->panel;
@@ -1076,6 +1089,36 @@ static void bxt_enable_backlight(struct intel_connector *connector)
 			pwm_ctl | BXT_BLC_PWM_ENABLE);
 }
 
+static void cnp_enable_backlight(struct intel_connector *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);
+	u32 pwm_ctl;
+
+	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+	if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
+		DRM_DEBUG_KMS("backlight already enabled\n");
+		pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
+		I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
+			   pwm_ctl);
+	}
+
+	I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
+		   panel->backlight.max);
+
+	intel_panel_actually_set_backlight(connector, panel->backlight.level);
+
+	pwm_ctl = 0;
+	if (panel->backlight.active_low_pwm)
+		pwm_ctl |= BXT_BLC_PWM_POLARITY;
+
+	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
+	POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
+		   pwm_ctl | BXT_BLC_PWM_ENABLE);
+}
+
 static void pwm_enable_backlight(struct intel_connector *connector)
 {
 	struct intel_panel *panel = &connector->panel;
@@ -1239,6 +1282,18 @@ void intel_backlight_device_unregister(struct intel_connector *connector)
 #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
 
 /*
+ * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
+ *      Value is found in SFUSE_STRAP.
+ *      PWM increment = 1
+ */
+static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
+{
+	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
+
+	return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
+}
+
+/*
  * BXT: PWM clock frequency = 19.2 MHz.
  */
 static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
@@ -1633,6 +1688,37 @@ bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
 	return 0;
 }
 
+static int
+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;
+
+	panel->backlight.controller = dev_priv->vbt.backlight.controller;
+
+	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
+
+	panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
+	panel->backlight.max =
+		I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
+
+	if (!panel->backlight.max)
+		panel->backlight.max = get_backlight_max_vbt(connector);
+
+	if (!panel->backlight.max)
+		return -ENODEV;
+
+	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.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
+
+	return 0;
+}
+
 static int pwm_setup_backlight(struct intel_connector *connector,
 			       enum pipe pipe)
 {
@@ -1749,6 +1835,14 @@ intel_panel_init_backlight_funcs(struct intel_panel *panel)
 		panel->backlight.set = bxt_set_backlight;
 		panel->backlight.get = bxt_get_backlight;
 		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
+		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
+	} else if (HAS_PCH_CNP(dev_priv)) {
+		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;
 	} else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
 		   HAS_PCH_KBP(dev_priv)) {
 		panel->backlight.setup = lpt_setup_backlight;
-- 
2.7.4

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Re: [PATCH 4/6] drm/i915/cnp: Backlight support for CNP.

[Pandiyan, Dhinakaran]

On Mon, 2017-05-08 at 16:45 -0700, Anusha Srivatsa wrote:
> From: Rodrigo Vivi <rodrigo.vivi@intel.com>
> 
> Split out BXT and CNP's setup_backlight(),enable_backlight(),
> disable_backlight() and hz_to_pwm() into
> two separate functions instead of reusing BXT function.
> 
> Reuse set_backlight() and get_backlight() since they have
> no reference to the utility pin.
> 
> v2: Reuse BXT functions with controller 0 instead of
>     redefining it. (Jani).
>     Use dev_priv->rawclk_freq instead of getting the value
>     from SFUSE_STRAP.
> v3: Avoid setup backligh controller along with hooks and
>     fully reuse hooks setup as suggested by Jani.
> v4: Clean up commit message.
> v5: Implement per PCH instead per platform.
> 
> v6: Introduce a new function for CNP.(Jani and Ville)
> 
> v7: Squash the all CNP Backlight support patches into a
> single patch. (Jani)
> 
> v8: Correct indentation, remove unneeded blank lines and
> correct mail address (Jani).
> 
> Reviewed-by: Jani Nikula <jani.nikula@intel.com>
> Suggested-by: Jani Nikula <jani.nikula@intel.com>
> Suggested-by: Ville Syrjala <ville.syrjala@intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> Cc: Jani Nikula <jani.nikula@intel.com>
> Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_panel.c | 94 ++++++++++++++++++++++++++++++++++++++
>  1 file changed, 94 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
> index cb50c52..22da1e2 100644
> --- a/drivers/gpu/drm/i915/intel_panel.c
> +++ b/drivers/gpu/drm/i915/intel_panel.c
> @@ -796,6 +796,19 @@ static void bxt_disable_backlight(struct intel_connector *connector)
>  	}
>  }
>  
> +static void cnp_disable_backlight(struct intel_connector *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);
> +
> +	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)
>  {
>  	struct intel_panel *panel = &connector->panel;
> @@ -1076,6 +1089,36 @@ static void bxt_enable_backlight(struct intel_connector *connector)
>  			pwm_ctl | BXT_BLC_PWM_ENABLE);
>  }
>  
> +static void cnp_enable_backlight(struct intel_connector *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);
> +	u32 pwm_ctl;
> +
> +	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
> +	if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
> +		DRM_DEBUG_KMS("backlight already enabled\n");
> +		pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
> +		I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
> +			   pwm_ctl);
> +	}
> +
> +	I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
> +		   panel->backlight.max);
> +
> +	intel_panel_actually_set_backlight(connector, panel->backlight.level);
> +
> +	pwm_ctl = 0;
> +	if (panel->backlight.active_low_pwm)
> +		pwm_ctl |= BXT_BLC_PWM_POLARITY;
> +
> +	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
> +	POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
> +	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
> +		   pwm_ctl | BXT_BLC_PWM_ENABLE);
> +}
> +
>  static void pwm_enable_backlight(struct intel_connector *connector)
>  {
>  	struct intel_panel *panel = &connector->panel;
> @@ -1239,6 +1282,18 @@ void intel_backlight_device_unregister(struct intel_connector *connector)
>  #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
>  
>  /*
> + * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
> + *      Value is found in SFUSE_STRAP.
> + *      PWM increment = 1
> + */
> +static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> +
> +	return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq), pwm_freq_hz);
> +}
> +
> +/*
>   * BXT: PWM clock frequency = 19.2 MHz.
>   */
>  static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
> @@ -1633,6 +1688,37 @@ bxt_setup_backlight(struct intel_connector *connector, enum pipe unused)
>  	return 0;
>  }
>  
> +static int
> +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;
> +
> +	panel->backlight.controller = dev_priv->vbt.backlight.controller;
> +
> +	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
> +
> +	panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
> +	panel->backlight.max =
> +		I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
> +
> +	if (!panel->backlight.max)
> +		panel->backlight.max = get_backlight_max_vbt(connector);
> +
> +	if (!panel->backlight.max)
> +		return -ENODEV;
> +
> +	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.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
> +
> +	return 0;
> +}
> +
>  static int pwm_setup_backlight(struct intel_connector *connector,
>  			       enum pipe pipe)
>  {
> @@ -1749,6 +1835,14 @@ intel_panel_init_backlight_funcs(struct intel_panel *panel)
>  		panel->backlight.set = bxt_set_backlight;
>  		panel->backlight.get = bxt_get_backlight;
>  		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
> +		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;

This diff should not be here.

-DK


> +	} else if (HAS_PCH_CNP(dev_priv)) {
> +		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;
>  	} else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
>  		   HAS_PCH_KBP(dev_priv)) {
>  		panel->backlight.setup = lpt_setup_backlight;

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Re: [PATCH 4/6] drm/i915/cnp: Backlight support for CNP.

[Srivatsa, Anusha]

>-----Original Message-----
>From: Pandiyan, Dhinakaran
>Sent: Monday, May 8, 2017 5:10 PM
>To: Srivatsa, Anusha <anusha.srivatsa@intel.com>
>Cc: intel-gfx@lists.freedesktop.org; Vivi, Rodrigo <rodrigo.vivi@intel.com>;
>Nikula, Jani <jani.nikula@intel.com>
>Subject: Re: [Intel-gfx] [PATCH 4/6] drm/i915/cnp: Backlight support for CNP.
>
>On Mon, 2017-05-08 at 16:45 -0700, Anusha Srivatsa wrote:
>> From: Rodrigo Vivi <rodrigo.vivi@intel.com>
>>
>> Split out BXT and CNP's setup_backlight(),enable_backlight(),
>> disable_backlight() and hz_to_pwm() into two separate functions
>> instead of reusing BXT function.
>>
>> Reuse set_backlight() and get_backlight() since they have no reference
>> to the utility pin.
>>
>> v2: Reuse BXT functions with controller 0 instead of
>>     redefining it. (Jani).
>>     Use dev_priv->rawclk_freq instead of getting the value
>>     from SFUSE_STRAP.
>> v3: Avoid setup backligh controller along with hooks and
>>     fully reuse hooks setup as suggested by Jani.
>> v4: Clean up commit message.
>> v5: Implement per PCH instead per platform.
>>
>> v6: Introduce a new function for CNP.(Jani and Ville)
>>
>> v7: Squash the all CNP Backlight support patches into a single patch.
>> (Jani)
>>
>> v8: Correct indentation, remove unneeded blank lines and correct mail
>> address (Jani).
>>
>> Reviewed-by: Jani Nikula <jani.nikula@intel.com>
>> Suggested-by: Jani Nikula <jani.nikula@intel.com>
>> Suggested-by: Ville Syrjala <ville.syrjala@intel.com>
>> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
>> Cc: Jani Nikula <jani.nikula@intel.com>
>> Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
>> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
>> ---
>>  drivers/gpu/drm/i915/intel_panel.c | 94
>> ++++++++++++++++++++++++++++++++++++++
>>  1 file changed, 94 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/intel_panel.c
>> b/drivers/gpu/drm/i915/intel_panel.c
>> index cb50c52..22da1e2 100644
>> --- a/drivers/gpu/drm/i915/intel_panel.c
>> +++ b/drivers/gpu/drm/i915/intel_panel.c
>> @@ -796,6 +796,19 @@ static void bxt_disable_backlight(struct
>intel_connector *connector)
>>  	}
>>  }
>>
>> +static void cnp_disable_backlight(struct intel_connector *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);
>> +
>> +	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)
>> {
>>  	struct intel_panel *panel = &connector->panel; @@ -1076,6 +1089,36
>> @@ static void bxt_enable_backlight(struct intel_connector *connector)
>>  			pwm_ctl | BXT_BLC_PWM_ENABLE);
>>  }
>>
>> +static void cnp_enable_backlight(struct intel_connector *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);
>> +	u32 pwm_ctl;
>> +
>> +	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
>> +	if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
>> +		DRM_DEBUG_KMS("backlight already enabled\n");
>> +		pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
>> +		I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
>> +			   pwm_ctl);
>> +	}
>> +
>> +	I915_WRITE(BXT_BLC_PWM_FREQ(panel->backlight.controller),
>> +		   panel->backlight.max);
>> +
>> +	intel_panel_actually_set_backlight(connector,
>> +panel->backlight.level);
>> +
>> +	pwm_ctl = 0;
>> +	if (panel->backlight.active_low_pwm)
>> +		pwm_ctl |= BXT_BLC_PWM_POLARITY;
>> +
>> +	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
>> +	POSTING_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
>> +	I915_WRITE(BXT_BLC_PWM_CTL(panel->backlight.controller),
>> +		   pwm_ctl | BXT_BLC_PWM_ENABLE);
>> +}
>> +
>>  static void pwm_enable_backlight(struct intel_connector *connector)
>> {
>>  	struct intel_panel *panel = &connector->panel; @@ -1239,6 +1282,18
>> @@ void intel_backlight_device_unregister(struct intel_connector
>> *connector)  #endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
>>
>>  /*
>> + * CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
>> + *      Value is found in SFUSE_STRAP.
>> + *      PWM increment = 1
>> + */
>> +static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32
>> +pwm_freq_hz) {
>> +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
>> +
>> +	return DIV_ROUND_CLOSEST(KHz(dev_priv->rawclk_freq),
>pwm_freq_hz); }
>> +
>> +/*
>>   * BXT: PWM clock frequency = 19.2 MHz.
>>   */
>>  static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32
>> pwm_freq_hz) @@ -1633,6 +1688,37 @@ bxt_setup_backlight(struct
>intel_connector *connector, enum pipe unused)
>>  	return 0;
>>  }
>>
>> +static int
>> +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;
>> +
>> +	panel->backlight.controller = dev_priv->vbt.backlight.controller;
>> +
>> +	pwm_ctl = I915_READ(BXT_BLC_PWM_CTL(panel->backlight.controller));
>> +
>> +	panel->backlight.active_low_pwm = pwm_ctl &
>BXT_BLC_PWM_POLARITY;
>> +	panel->backlight.max =
>> +		I915_READ(BXT_BLC_PWM_FREQ(panel->backlight.controller));
>> +
>> +	if (!panel->backlight.max)
>> +		panel->backlight.max = get_backlight_max_vbt(connector);
>> +
>> +	if (!panel->backlight.max)
>> +		return -ENODEV;
>> +
>> +	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.enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
>> +
>> +	return 0;
>> +}
>> +
>>  static int pwm_setup_backlight(struct intel_connector *connector,
>>  			       enum pipe pipe)
>>  {
>> @@ -1749,6 +1835,14 @@ intel_panel_init_backlight_funcs(struct intel_panel
>*panel)
>>  		panel->backlight.set = bxt_set_backlight;
>>  		panel->backlight.get = bxt_get_backlight;
>>  		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
>> +		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
>
>This diff should not be here.

Ah! Nice catch... Will rebase again and send. 
Thanks a lot.

Anusha

>-DK
>
>
>> +	} else if (HAS_PCH_CNP(dev_priv)) {
>> +		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;
>>  	} else if (HAS_PCH_LPT(dev_priv) || HAS_PCH_SPT(dev_priv) ||
>>  		   HAS_PCH_KBP(dev_priv)) {
>>  		panel->backlight.setup = lpt_setup_backlight;

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