diff mbox series

[PATCHv4,4/7] drm/i915/histogram: histogram interrupt handling

Message ID 20240925150754.1876893-5-arun.r.murthy@intel.com (mailing list archive)
State New, archived
Headers show
Series Display Global Histogram | expand

Commit Message

Arun R Murthy Sept. 25, 2024, 3:07 p.m. UTC 
Upon enabling histogram an interrupt is trigerred after the generation
of the statistics. This patch registers the histogram interrupt and
handles the interrupt.

v2: Added intel_crtc backpointer to intel_histogram struct (Jani)
    Removed histogram_wq and instead use dev_priv->unodered_eq (Jani)
v3: Replaced drm_i915_private with intel_display (Suraj)
    Refactored the histogram read code (Jani)
v4: Rebased after addressing comments on patch 1

Signed-off-by: Arun R Murthy <arun.r.murthy@intel.com>
---
 .../gpu/drm/i915/display/intel_display_irq.c  |  6 +-
 .../gpu/drm/i915/display/intel_histogram.c    | 93 +++++++++++++++++++
 .../gpu/drm/i915/display/intel_histogram.h    |  3 +
 drivers/gpu/drm/i915/i915_reg.h               |  5 +-
 4 files changed, 104 insertions(+), 3 deletions(-)

Comments

Kandpal, Suraj Oct. 24, 2024, 5:26 a.m. UTC | #1 
> -----Original Message-----
> From: dri-devel <dri-devel-bounces@lists.freedesktop.org> On Behalf Of
> Arun R Murthy
> Sent: Wednesday, September 25, 2024 8:38 PM
> To: intel-xe@lists.freedesktop.org; intel-gfx@lists.freedesktop.org; dri-
> devel@lists.freedesktop.org
> Cc: Murthy, Arun R <arun.r.murthy@intel.com>
> Subject: [PATCHv4 4/7] drm/i915/histogram: histogram interrupt handling
> 
> Upon enabling histogram an interrupt is trigerred after the generation of the
> statistics. This patch registers the histogram interrupt and handles the
> interrupt.
> 
> v2: Added intel_crtc backpointer to intel_histogram struct (Jani)
>     Removed histogram_wq and instead use dev_priv->unodered_eq (Jani)
> v3: Replaced drm_i915_private with intel_display (Suraj)
>     Refactored the histogram read code (Jani)
> v4: Rebased after addressing comments on patch 1
> 
> Signed-off-by: Arun R Murthy <arun.r.murthy@intel.com>
> ---
>  .../gpu/drm/i915/display/intel_display_irq.c  |  6 +-
>  .../gpu/drm/i915/display/intel_histogram.c    | 93 +++++++++++++++++++
>  .../gpu/drm/i915/display/intel_histogram.h    |  3 +
>  drivers/gpu/drm/i915/i915_reg.h               |  5 +-
>  4 files changed, 104 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display_irq.c
> b/drivers/gpu/drm/i915/display/intel_display_irq.c
> index 6878dde85031..40514966a2ea 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_irq.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_irq.c
> @@ -20,6 +20,7 @@
>  #include "intel_fdi_regs.h"
>  #include "intel_fifo_underrun.h"
>  #include "intel_gmbus.h"
> +#include "intel_histogram.h"
>  #include "intel_hotplug_irq.h"
>  #include "intel_pipe_crc_regs.h"
>  #include "intel_pmdemand.h"
> @@ -1190,6 +1191,9 @@ void gen8_de_irq_handler(struct drm_i915_private
> *dev_priv, u32 master_ctl)
>  		if (iir & gen8_de_pipe_underrun_mask(dev_priv))
>  			intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe);
> 
> +		if (iir & GEN9_PIPE_HISTOGRAM_EVENT)
> +			intel_histogram_irq_handler(display, pipe);
> +
>  		fault_errors = iir & gen8_de_pipe_fault_mask(dev_priv);
>  		if (fault_errors)
>  			drm_err_ratelimited(&dev_priv->drm,
> @@ -1756,7 +1760,7 @@ void gen8_de_irq_postinstall(struct
> drm_i915_private *dev_priv)
>  	struct intel_uncore *uncore = &dev_priv->uncore;
> 
>  	u32 de_pipe_masked = gen8_de_pipe_fault_mask(dev_priv) |
> -		GEN8_PIPE_CDCLK_CRC_DONE;
> +		GEN8_PIPE_CDCLK_CRC_DONE |
> GEN9_PIPE_HISTOGRAM_EVENT;
>  	u32 de_pipe_enables;
>  	u32 de_port_masked = gen8_de_port_aux_mask(dev_priv);
>  	u32 de_port_enables;
> diff --git a/drivers/gpu/drm/i915/display/intel_histogram.c
> b/drivers/gpu/drm/i915/display/intel_histogram.c
> index 86439636b490..ce2a5eae2784 100644
> --- a/drivers/gpu/drm/i915/display/intel_histogram.c
> +++ b/drivers/gpu/drm/i915/display/intel_histogram.c
> @@ -18,6 +18,8 @@
>  #define HISTOGRAM_GUARDBAND_THRESHOLD_DEFAULT 300    // 3.0% of
> the pipe's current pixel count.
>  #define HISTOGRAM_GUARDBAND_PRECISION_FACTOR 10000   // Precision
> factor for threshold guardband.
>  #define HISTOGRAM_DEFAULT_GUARDBAND_DELAY 0x04
> +#define HISTOGRAM_BIN_READ_RETRY_COUNT 5 #define
> +HISTOGRAM_BIN_READ_DELAY 2
> 
>  struct intel_histogram {
>  	struct intel_crtc *crtc;
> @@ -27,6 +29,92 @@ struct intel_histogram {
>  	u32 bin_data[HISTOGRAM_BIN_COUNT];
>  };
> 
> +static bool intel_histogram_get_data(struct intel_crtc *intel_crtc) {
> +	struct intel_display *display = to_intel_display(intel_crtc);
> +	struct intel_histogram *histogram = intel_crtc->histogram;
> +	u8 index, retry_count;
> +	u32 dpstbin;
> +
> +	index = 0;
> +	retry_count = 0;
> +
> +	while (index < HISTOGRAM_BIN_COUNT) {
> +		dpstbin = intel_de_read(display, DPST_BIN(intel_crtc->pipe));
> +		if (!(dpstbin & DPST_BIN_BUSY)) {
> +			histogram->bin_data[index] = dpstbin &
> DPST_BIN_DATA_MASK;
> +			index++;
> +		} else {
> +			/*
> +			 * If DPST_BIN busy bit is set, then set the
> +			 * DPST_CTL bin reg index to 0 and proceed
> +			 * from beginning.
> +			 */
> +			retry_count++;
> +			if (retry_count >
> HISTOGRAM_BIN_READ_RETRY_COUNT) {
> +				drm_err(display->drm, "Histogram bin read
> failed with max retry\n");
> +				return false;
> +			}
> +			/* Add a delay before retrying */
> +			fsleep(HISTOGRAM_BIN_READ_DELAY);

Why the delay here the bspec does not mention this it does mention waiting for a vblank 
After clearing DPST_CTL Register Function Select to TC which is what we should be doing

> +			index = 0;
> +			intel_de_rmw(display, DPST_CTL(intel_crtc->pipe),
> +				     DPST_CTL_BIN_REG_FUNC_SEL |
> +				     DPST_CTL_BIN_REG_MASK, 0);

We should probably only be doing a intel_de_write here and clearing DPST_CTL
DPST_CTL_BIN_REG_FUNC_TC will only clear the required bit since that all the bspec expects of us

Regards,
Suraj Kandpal

> +		}
> +	}
> +	return true;
> +}
> +
> +static void intel_histogram_handle_int_work(struct work_struct *work) {
> +	struct intel_histogram *histogram = container_of(work,
> +		struct intel_histogram, work.work);
> +	struct intel_crtc *intel_crtc = histogram->crtc;
> +	struct intel_display *display = to_intel_display(intel_crtc);
> +	char *histogram_event[] = {"HISTOGRAM=1", NULL};
> +
> +	/*
> +	 * TODO: PSR to be exited while reading the Histogram data
> +	 * Set DPST_CTL Bin Reg function select to TC
> +	 * Set DPST_CTL Bin Register Index to 0
> +	 */
> +	intel_de_rmw(display, DPST_CTL(intel_crtc->pipe),
> +		     DPST_CTL_BIN_REG_FUNC_SEL |
> DPST_CTL_BIN_REG_MASK, 0);
> +	if (intel_histogram_get_data(intel_crtc)) {
> +		/* Notify user for Histogram rediness */

Typo *readiness

> +		if (kobject_uevent_env(&display->drm->primary->kdev->kobj,
> +				       KOBJ_CHANGE, histogram_event))
> +			drm_err(display->drm,
> +				"sending HISTOGRAM event failed\n");
> +	}
> +
> +	/* Enable histogram interrupt */
> +	intel_de_rmw(display, DPST_GUARD(intel_crtc->pipe),
> DPST_GUARD_HIST_INT_EN,
> +		     DPST_GUARD_HIST_INT_EN);
> +
> +	/* Clear histogram interrupt by setting histogram interrupt status bit*/
> +	intel_de_rmw(display, DPST_GUARD(intel_crtc->pipe),
> +		     DPST_GUARD_HIST_EVENT_STATUS, 1); }
> +
> +void intel_histogram_irq_handler(struct intel_display *display, enum
> +pipe pipe) {
> +	struct intel_crtc *intel_crtc =
> +		to_intel_crtc(drm_crtc_from_index(display->drm, pipe));
> +	struct intel_histogram *histogram = intel_crtc->histogram;
> +	struct drm_i915_private *i915 = to_i915(intel_crtc->base.dev);
> +
> +	if (!histogram->enable) {
> +		drm_err(display->drm,
> +			"spurious interrupt, histogram not enabled\n");
> +		return;
> +	}
> +
> +	queue_delayed_work(i915->unordered_wq,
> +			   &histogram->work, 0);
> +}
> +
>  int intel_histogram_atomic_check(struct intel_crtc *intel_crtc)  {
>  	struct intel_histogram *histogram = intel_crtc->histogram; @@ -105,6
> +193,7 @@ static void intel_histogram_disable(struct intel_crtc *intel_crtc)
>  	intel_de_rmw(display, DPST_CTL(pipe),
>  		     DPST_CTL_IE_HIST_EN, 0);
> 
> +	cancel_delayed_work(&histogram->work);
>  	histogram->enable = false;
>  }
> 
> @@ -166,6 +255,7 @@ void intel_histogram_finish(struct intel_crtc
> *intel_crtc)  {
>  	struct intel_histogram *histogram = intel_crtc->histogram;
> 
> +	cancel_delayed_work_sync(&histogram->work);
>  	kfree(histogram);
>  }
> 
> @@ -183,5 +273,8 @@ int intel_histogram_init(struct intel_crtc *intel_crtc)
>  	histogram->crtc = intel_crtc;
>  	histogram->can_enable = false;
> 
> +	INIT_DEFERRABLE_WORK(&histogram->work,
> +			     intel_histogram_handle_int_work);
> +
>  	return 0;
>  }
> diff --git a/drivers/gpu/drm/i915/display/intel_histogram.h
> b/drivers/gpu/drm/i915/display/intel_histogram.h
> index 9d66724f9c53..14f2425e3038 100644
> --- a/drivers/gpu/drm/i915/display/intel_histogram.h
> +++ b/drivers/gpu/drm/i915/display/intel_histogram.h
> @@ -9,6 +9,8 @@
>  #include <linux/types.h>
> 
>  struct intel_crtc;
> +struct intel_display;
> +enum pipe;
> 
>  #define HISTOGRAM_BIN_COUNT                    32
>  #define HISTOGRAM_IET_LENGTH                   33
> @@ -27,6 +29,7 @@ enum intel_global_hist_lut {  };
> 
>  int intel_histogram_atomic_check(struct intel_crtc *intel_crtc);
> +void intel_histogram_irq_handler(struct intel_display *display, enum
> +pipe pipe);
>  int intel_histogram_update(struct intel_crtc *intel_crtc, bool enable);  int
> intel_histogram_set_iet_lut(struct intel_crtc *intel_crtc, u32 *data);  int
> intel_histogram_init(struct intel_crtc *intel_crtc); diff --git
> a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index
> 7396fc630e29..7e062d6c8901 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -1643,7 +1643,7 @@
>  #define   PIPE_HOTPLUG_INTERRUPT_ENABLE		(1UL << 26)
>  #define   PIPE_VSYNC_INTERRUPT_ENABLE		(1UL << 25)
>  #define   PIPE_DISPLAY_LINE_COMPARE_ENABLE	(1UL << 24)
> -#define   PIPE_DPST_EVENT_ENABLE		(1UL << 23)
> +#define   PIPE_HISTOGRAM_EVENT_ENABLE		(1UL << 23)
>  #define   SPRITE0_FLIP_DONE_INT_EN_VLV		(1UL << 22)
>  #define   PIPE_LEGACY_BLC_EVENT_ENABLE		(1UL << 22)
>  #define   PIPE_ODD_FIELD_INTERRUPT_ENABLE	(1UL << 21)
> @@ -1666,7 +1666,7 @@
>  #define   PIPE_HOTPLUG_INTERRUPT_STATUS		(1UL << 10)
>  #define   PIPE_VSYNC_INTERRUPT_STATUS		(1UL << 9)
>  #define   PIPE_DISPLAY_LINE_COMPARE_STATUS	(1UL << 8)
> -#define   PIPE_DPST_EVENT_STATUS		(1UL << 7)
> +#define   PIPE_HISTOGRAM_EVENT_STATUS		(1UL << 7)
>  #define   PIPE_A_PSR_STATUS_VLV			(1UL << 6)
>  #define   PIPE_LEGACY_BLC_EVENT_STATUS		(1UL << 6)
>  #define   PIPE_ODD_FIELD_INTERRUPT_STATUS	(1UL << 5)
> @@ -2505,6 +2505,7 @@
>  #define  GEN12_DSB_1_INT		REG_BIT(14) /* tgl+ */
>  #define  GEN12_DSB_0_INT		REG_BIT(13) /* tgl+ */
>  #define  GEN12_DSB_INT(dsb_id)		REG_BIT(13 + (dsb_id))
> +#define  GEN9_PIPE_HISTOGRAM_EVENT	REG_BIT(12) /* skl+ */
>  #define  GEN9_PIPE_CURSOR_FAULT		REG_BIT(11) /* skl+ */
>  #define  GEN9_PIPE_PLANE4_FAULT		REG_BIT(10) /* skl+ */
>  #define  GEN8_PIPE_CURSOR_FAULT		REG_BIT(10) /* bdw */
> --
> 2.25.1
diff mbox series

Patch

diff --git a/drivers/gpu/drm/i915/display/intel_display_irq.c b/drivers/gpu/drm/i915/display/intel_display_irq.c
index 6878dde85031..40514966a2ea 100644
--- a/drivers/gpu/drm/i915/display/intel_display_irq.c
+++ b/drivers/gpu/drm/i915/display/intel_display_irq.c
@@ -20,6 +20,7 @@ 
 #include "intel_fdi_regs.h"
 #include "intel_fifo_underrun.h"
 #include "intel_gmbus.h"
+#include "intel_histogram.h"
 #include "intel_hotplug_irq.h"
 #include "intel_pipe_crc_regs.h"
 #include "intel_pmdemand.h"
@@ -1190,6 +1191,9 @@  void gen8_de_irq_handler(struct drm_i915_private *dev_priv, u32 master_ctl)
 		if (iir & gen8_de_pipe_underrun_mask(dev_priv))
 			intel_cpu_fifo_underrun_irq_handler(dev_priv, pipe);
 
+		if (iir & GEN9_PIPE_HISTOGRAM_EVENT)
+			intel_histogram_irq_handler(display, pipe);
+
 		fault_errors = iir & gen8_de_pipe_fault_mask(dev_priv);
 		if (fault_errors)
 			drm_err_ratelimited(&dev_priv->drm,
@@ -1756,7 +1760,7 @@  void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
 	struct intel_uncore *uncore = &dev_priv->uncore;
 
 	u32 de_pipe_masked = gen8_de_pipe_fault_mask(dev_priv) |
-		GEN8_PIPE_CDCLK_CRC_DONE;
+		GEN8_PIPE_CDCLK_CRC_DONE | GEN9_PIPE_HISTOGRAM_EVENT;
 	u32 de_pipe_enables;
 	u32 de_port_masked = gen8_de_port_aux_mask(dev_priv);
 	u32 de_port_enables;
diff --git a/drivers/gpu/drm/i915/display/intel_histogram.c b/drivers/gpu/drm/i915/display/intel_histogram.c
index 86439636b490..ce2a5eae2784 100644
--- a/drivers/gpu/drm/i915/display/intel_histogram.c
+++ b/drivers/gpu/drm/i915/display/intel_histogram.c
@@ -18,6 +18,8 @@ 
 #define HISTOGRAM_GUARDBAND_THRESHOLD_DEFAULT 300    // 3.0% of the pipe's current pixel count.
 #define HISTOGRAM_GUARDBAND_PRECISION_FACTOR 10000   // Precision factor for threshold guardband.
 #define HISTOGRAM_DEFAULT_GUARDBAND_DELAY 0x04
+#define HISTOGRAM_BIN_READ_RETRY_COUNT 5
+#define HISTOGRAM_BIN_READ_DELAY 2
 
 struct intel_histogram {
 	struct intel_crtc *crtc;
@@ -27,6 +29,92 @@  struct intel_histogram {
 	u32 bin_data[HISTOGRAM_BIN_COUNT];
 };
 
+static bool intel_histogram_get_data(struct intel_crtc *intel_crtc)
+{
+	struct intel_display *display = to_intel_display(intel_crtc);
+	struct intel_histogram *histogram = intel_crtc->histogram;
+	u8 index, retry_count;
+	u32 dpstbin;
+
+	index = 0;
+	retry_count = 0;
+
+	while (index < HISTOGRAM_BIN_COUNT) {
+		dpstbin = intel_de_read(display, DPST_BIN(intel_crtc->pipe));
+		if (!(dpstbin & DPST_BIN_BUSY)) {
+			histogram->bin_data[index] = dpstbin & DPST_BIN_DATA_MASK;
+			index++;
+		} else {
+			/*
+			 * If DPST_BIN busy bit is set, then set the
+			 * DPST_CTL bin reg index to 0 and proceed
+			 * from beginning.
+			 */
+			retry_count++;
+			if (retry_count > HISTOGRAM_BIN_READ_RETRY_COUNT) {
+				drm_err(display->drm, "Histogram bin read failed with max retry\n");
+				return false;
+			}
+			/* Add a delay before retrying */
+			fsleep(HISTOGRAM_BIN_READ_DELAY);
+			index = 0;
+			intel_de_rmw(display, DPST_CTL(intel_crtc->pipe),
+				     DPST_CTL_BIN_REG_FUNC_SEL |
+				     DPST_CTL_BIN_REG_MASK, 0);
+		}
+	}
+	return true;
+}
+
+static void intel_histogram_handle_int_work(struct work_struct *work)
+{
+	struct intel_histogram *histogram = container_of(work,
+		struct intel_histogram, work.work);
+	struct intel_crtc *intel_crtc = histogram->crtc;
+	struct intel_display *display = to_intel_display(intel_crtc);
+	char *histogram_event[] = {"HISTOGRAM=1", NULL};
+
+	/*
+	 * TODO: PSR to be exited while reading the Histogram data
+	 * Set DPST_CTL Bin Reg function select to TC
+	 * Set DPST_CTL Bin Register Index to 0
+	 */
+	intel_de_rmw(display, DPST_CTL(intel_crtc->pipe),
+		     DPST_CTL_BIN_REG_FUNC_SEL | DPST_CTL_BIN_REG_MASK, 0);
+	if (intel_histogram_get_data(intel_crtc)) {
+		/* Notify user for Histogram rediness */
+		if (kobject_uevent_env(&display->drm->primary->kdev->kobj,
+				       KOBJ_CHANGE, histogram_event))
+			drm_err(display->drm,
+				"sending HISTOGRAM event failed\n");
+	}
+
+	/* Enable histogram interrupt */
+	intel_de_rmw(display, DPST_GUARD(intel_crtc->pipe), DPST_GUARD_HIST_INT_EN,
+		     DPST_GUARD_HIST_INT_EN);
+
+	/* Clear histogram interrupt by setting histogram interrupt status bit*/
+	intel_de_rmw(display, DPST_GUARD(intel_crtc->pipe),
+		     DPST_GUARD_HIST_EVENT_STATUS, 1);
+}
+
+void intel_histogram_irq_handler(struct intel_display *display, enum pipe pipe)
+{
+	struct intel_crtc *intel_crtc =
+		to_intel_crtc(drm_crtc_from_index(display->drm, pipe));
+	struct intel_histogram *histogram = intel_crtc->histogram;
+	struct drm_i915_private *i915 = to_i915(intel_crtc->base.dev);
+
+	if (!histogram->enable) {
+		drm_err(display->drm,
+			"spurious interrupt, histogram not enabled\n");
+		return;
+	}
+
+	queue_delayed_work(i915->unordered_wq,
+			   &histogram->work, 0);
+}
+
 int intel_histogram_atomic_check(struct intel_crtc *intel_crtc)
 {
 	struct intel_histogram *histogram = intel_crtc->histogram;
@@ -105,6 +193,7 @@  static void intel_histogram_disable(struct intel_crtc *intel_crtc)
 	intel_de_rmw(display, DPST_CTL(pipe),
 		     DPST_CTL_IE_HIST_EN, 0);
 
+	cancel_delayed_work(&histogram->work);
 	histogram->enable = false;
 }
 
@@ -166,6 +255,7 @@  void intel_histogram_finish(struct intel_crtc *intel_crtc)
 {
 	struct intel_histogram *histogram = intel_crtc->histogram;
 
+	cancel_delayed_work_sync(&histogram->work);
 	kfree(histogram);
 }
 
@@ -183,5 +273,8 @@  int intel_histogram_init(struct intel_crtc *intel_crtc)
 	histogram->crtc = intel_crtc;
 	histogram->can_enable = false;
 
+	INIT_DEFERRABLE_WORK(&histogram->work,
+			     intel_histogram_handle_int_work);
+
 	return 0;
 }
diff --git a/drivers/gpu/drm/i915/display/intel_histogram.h b/drivers/gpu/drm/i915/display/intel_histogram.h
index 9d66724f9c53..14f2425e3038 100644
--- a/drivers/gpu/drm/i915/display/intel_histogram.h
+++ b/drivers/gpu/drm/i915/display/intel_histogram.h
@@ -9,6 +9,8 @@ 
 #include <linux/types.h>
 
 struct intel_crtc;
+struct intel_display;
+enum pipe;
 
 #define HISTOGRAM_BIN_COUNT                    32
 #define HISTOGRAM_IET_LENGTH                   33
@@ -27,6 +29,7 @@  enum intel_global_hist_lut {
 };
 
 int intel_histogram_atomic_check(struct intel_crtc *intel_crtc);
+void intel_histogram_irq_handler(struct intel_display *display, enum pipe pipe);
 int intel_histogram_update(struct intel_crtc *intel_crtc, bool enable);
 int intel_histogram_set_iet_lut(struct intel_crtc *intel_crtc, u32 *data);
 int intel_histogram_init(struct intel_crtc *intel_crtc);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 7396fc630e29..7e062d6c8901 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1643,7 +1643,7 @@ 
 #define   PIPE_HOTPLUG_INTERRUPT_ENABLE		(1UL << 26)
 #define   PIPE_VSYNC_INTERRUPT_ENABLE		(1UL << 25)
 #define   PIPE_DISPLAY_LINE_COMPARE_ENABLE	(1UL << 24)
-#define   PIPE_DPST_EVENT_ENABLE		(1UL << 23)
+#define   PIPE_HISTOGRAM_EVENT_ENABLE		(1UL << 23)
 #define   SPRITE0_FLIP_DONE_INT_EN_VLV		(1UL << 22)
 #define   PIPE_LEGACY_BLC_EVENT_ENABLE		(1UL << 22)
 #define   PIPE_ODD_FIELD_INTERRUPT_ENABLE	(1UL << 21)
@@ -1666,7 +1666,7 @@ 
 #define   PIPE_HOTPLUG_INTERRUPT_STATUS		(1UL << 10)
 #define   PIPE_VSYNC_INTERRUPT_STATUS		(1UL << 9)
 #define   PIPE_DISPLAY_LINE_COMPARE_STATUS	(1UL << 8)
-#define   PIPE_DPST_EVENT_STATUS		(1UL << 7)
+#define   PIPE_HISTOGRAM_EVENT_STATUS		(1UL << 7)
 #define   PIPE_A_PSR_STATUS_VLV			(1UL << 6)
 #define   PIPE_LEGACY_BLC_EVENT_STATUS		(1UL << 6)
 #define   PIPE_ODD_FIELD_INTERRUPT_STATUS	(1UL << 5)
@@ -2505,6 +2505,7 @@ 
 #define  GEN12_DSB_1_INT		REG_BIT(14) /* tgl+ */
 #define  GEN12_DSB_0_INT		REG_BIT(13) /* tgl+ */
 #define  GEN12_DSB_INT(dsb_id)		REG_BIT(13 + (dsb_id))
+#define  GEN9_PIPE_HISTOGRAM_EVENT	REG_BIT(12) /* skl+ */
 #define  GEN9_PIPE_CURSOR_FAULT		REG_BIT(11) /* skl+ */
 #define  GEN9_PIPE_PLANE4_FAULT		REG_BIT(10) /* skl+ */
 #define  GEN8_PIPE_CURSOR_FAULT		REG_BIT(10) /* bdw */