[PATCHv6 7/8] drm/i915/histogram: Histogram changes for Display 20+

[Arun R Murthy <arun.r.murthy@intel.com>]

In Display 20+, new registers are added for setting index, reading
histogram and writing the IET.

v2: Removed duplicate code (Jani)
v3: Moved histogram core changes to earlier patches (Jani/Suraj)
v4: Rebased after addressing comments on patch 1
v5: Added the retry logic from patch3 and rebased the patch series
v6: optimize wite_iet() (Suraj)

Signed-off-by: Arun R Murthy <arun.r.murthy@intel.com>
---
 .../gpu/drm/i915/display/intel_histogram.c    | 105 +++++++++++++-----
 .../drm/i915/display/intel_histogram_regs.h   |  25 +++++
 2 files changed, 103 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_histogram.c b/drivers/gpu/drm/i915/display/intel_histogram.c
index a64e778fface..db4bc60be557 100644
--- a/drivers/gpu/drm/i915/display/intel_histogram.c
+++ b/drivers/gpu/drm/i915/display/intel_histogram.c
@@ -29,6 +29,37 @@ struct intel_histogram {
 	u32 bin_data[HISTOGRAM_BIN_COUNT];
 };
 
+static void set_bin_index_0(struct intel_display *display, enum pipe pipe)
+{
+	if (DISPLAY_VER(display) >= 20)
+		intel_de_rmw(display, DPST_IE_INDEX(pipe),
+			     DPST_IE_BIN_INDEX_MASK, DPST_IE_BIN_INDEX(0));
+	else
+		intel_de_rmw(display, DPST_CTL(pipe),
+			     DPST_CTL_BIN_REG_MASK,
+			     DPST_CTL_BIN_REG_CLEAR);
+}
+
+static void write_iet(struct intel_display *display, enum pipe pipe,
+			      u32 *data)
+{
+	int i;
+
+	for (i = 0; i < HISTOGRAM_IET_LENGTH; i++) {
+		if (DISPLAY_VER(display) >= 20)
+			intel_de_rmw(display, DPST_IE_BIN(pipe),
+				     DPST_IE_BIN_DATA_MASK,
+				     DPST_IE_BIN_DATA(data[i]));
+		else
+			intel_de_rmw(display, DPST_BIN(pipe),
+				     DPST_BIN_DATA_MASK,
+				     DPST_BIN_DATA(data[i]));
+
+		drm_dbg_atomic(display->drm, "iet_lut[%d]=%x\n",
+			       i, data[i]);
+	}
+}
+
 static bool intel_histogram_get_data(struct intel_crtc *intel_crtc)
 {
 	struct intel_display *display = to_intel_display(intel_crtc);
@@ -36,12 +67,27 @@ static bool intel_histogram_get_data(struct intel_crtc *intel_crtc)
 	int index;
 	u32 dpstbin;
 
+	if (DISPLAY_VER(display) >= 20)
+		intel_de_rmw(display, DPST_HIST_INDEX(intel_crtc->pipe),
+			     DPST_HIST_BIN_INDEX_MASK,
+			     DPST_HIST_BIN_INDEX(0));
+	else
+		intel_de_rmw(display, DPST_CTL(intel_crtc->pipe),
+			     DPST_CTL_BIN_REG_FUNC_SEL | DPST_CTL_BIN_REG_MASK, 0);
+
 	for (index = 0; index < ARRAY_SIZE(histogram->bin_data); index++) {
-		dpstbin = intel_de_read(display, DPST_BIN(intel_crtc->pipe));
+		dpstbin = intel_de_read(display, (DISPLAY_VER(display) >= 20 ?
+					DPST_HIST_BIN(intel_crtc->pipe) :
+					DPST_BIN(intel_crtc->pipe)));
 		if (!(dpstbin & DPST_BIN_BUSY)) {
-			histogram->bin_data[index] = dpstbin & DPST_BIN_DATA_MASK;
-		} else
+			histogram->bin_data[index] = dpstbin & (DISPLAY_VER(display) >= 20 ?
+								DPST_HIST_BIN_DATA_MASK :
+								DPST_BIN_DATA_MASK);
+		} else {
+			drm_err(display->drm, "Histogram bin busy, retyring\n");
+			fsleep(2);
 			return false;
+		}
 	}
 	return true;
 }
@@ -69,8 +115,6 @@ static void intel_histogram_handle_int_work(struct work_struct *work)
 	 * 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);
 	for (retry = 0; retry < HISTOGRAM_BIN_READ_RETRY_COUNT; retry++) {
 		if (intel_histogram_get_data(intel_crtc)) {
 			drm_property_replace_global_blob(display->drm,
@@ -153,15 +197,26 @@ static int intel_histogram_enable(struct intel_crtc *intel_crtc)
 	if (histogram->enable)
 		return 0;
 
-	 /* enable histogram, clear DPST_CTL bin reg func select to TC */
-	intel_de_rmw(display, DPST_CTL(pipe),
-		     DPST_CTL_BIN_REG_FUNC_SEL | DPST_CTL_IE_HIST_EN |
-		     DPST_CTL_HIST_MODE | DPST_CTL_IE_TABLE_VALUE_FORMAT |
-		     DPST_CTL_ENHANCEMENT_MODE_MASK | DPST_CTL_IE_MODI_TABLE_EN,
-		     DPST_CTL_BIN_REG_FUNC_TC | DPST_CTL_IE_HIST_EN |
-		     DPST_CTL_HIST_MODE_HSV |
-		     DPST_CTL_IE_TABLE_VALUE_FORMAT_1INT_9FRAC |
-		     DPST_CTL_EN_MULTIPLICATIVE | DPST_CTL_IE_MODI_TABLE_EN);
+	 /* enable histogram, clear DPST_BIN reg and select TC function */
+	if (DISPLAY_VER(display) >= 20)
+		intel_de_rmw(display, DPST_CTL(pipe),
+			     DPST_CTL_IE_HIST_EN |
+			     DPST_CTL_HIST_MODE,
+			     DPST_CTL_IE_HIST_EN |
+			     DPST_CTL_HIST_MODE_HSV);
+	else
+		 /* enable histogram, clear DPST_BIN reg and select TC function */
+		intel_de_rmw(display, DPST_CTL(pipe),
+			     DPST_CTL_BIN_REG_FUNC_SEL | DPST_CTL_IE_HIST_EN |
+			     DPST_CTL_HIST_MODE |
+			     DPST_CTL_IE_TABLE_VALUE_FORMAT |
+			     DPST_CTL_ENHANCEMENT_MODE_MASK |
+			     DPST_CTL_IE_MODI_TABLE_EN,
+			     DPST_CTL_BIN_REG_FUNC_TC | DPST_CTL_IE_HIST_EN |
+			     DPST_CTL_HIST_MODE_HSV |
+			     DPST_CTL_IE_TABLE_VALUE_FORMAT_1INT_9FRAC |
+			     DPST_CTL_EN_MULTIPLICATIVE |
+			     DPST_CTL_IE_MODI_TABLE_EN);
 
 	/* Re-Visit: check if wait for one vblank is required */
 	drm_crtc_wait_one_vblank(&intel_crtc->base);
@@ -230,7 +285,6 @@ int intel_histogram_set_iet_lut(struct intel_crtc *intel_crtc, u32 *data)
 	struct intel_histogram *histogram = intel_crtc->histogram;
 	struct intel_display *display = to_intel_display(intel_crtc);
 	int pipe = intel_crtc->pipe;
-	int i = 0;
 
 	if (!histogram)
 		return -EINVAL;
@@ -245,22 +299,19 @@ int intel_histogram_set_iet_lut(struct intel_crtc *intel_crtc, u32 *data)
 		return -EINVAL;
 	}
 
-	/* Set DPST_CTL Bin Reg function select to IE & wait for a vblabk */
-	intel_de_rmw(display, DPST_CTL(pipe),
-		     DPST_CTL_BIN_REG_FUNC_SEL, DPST_CTL_BIN_REG_FUNC_IE);
 
-	drm_crtc_wait_one_vblank(&intel_crtc->base);
+	if (DISPLAY_VER(display) < 20) {
+		/* Set DPST_CTL Bin Reg function select to IE & wait for a vblabk */
+		intel_de_rmw(display, DPST_CTL(pipe),
+			     DPST_CTL_BIN_REG_FUNC_SEL,
+			     DPST_CTL_BIN_REG_FUNC_IE);
 
-	 /* Set DPST_CTL Bin Register Index to 0 */
-	intel_de_rmw(display, DPST_CTL(pipe),
-		     DPST_CTL_BIN_REG_MASK, DPST_CTL_BIN_REG_CLEAR);
-
-	for (i = 0; i < HISTOGRAM_IET_LENGTH; i++) {
-		intel_de_rmw(display, DPST_BIN(pipe),
-			     DPST_BIN_DATA_MASK, data[i]);
-		drm_dbg_atomic(display->drm, "iet_lut[%d]=%x\n", i, data[i]);
+		drm_crtc_wait_one_vblank(&intel_crtc->base);
 	}
 
+	set_bin_index_0(display, pipe);
+	write_iet(display, pipe, data);
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/i915/display/intel_histogram_regs.h b/drivers/gpu/drm/i915/display/intel_histogram_regs.h
index 213c9f483567..3fbb9c2deaae 100644
--- a/drivers/gpu/drm/i915/display/intel_histogram_regs.h
+++ b/drivers/gpu/drm/i915/display/intel_histogram_regs.h
@@ -45,6 +45,31 @@
 #define _DPST_BIN_B					0x491C4
 #define DPST_BIN(pipe)					_MMIO_PIPE(pipe, _DPST_BIN_A, _DPST_BIN_B)
 #define  DPST_BIN_DATA_MASK				REG_GENMASK(23, 0)
+#define  DPST_BIN_DATA(val)				REG_FIELD_PREP(DPST_BIN_DATA_MASK, val)
 #define  DPST_BIN_BUSY					REG_BIT(31)
 
+#define _DPST_HIST_INDEX_A				0x490D8
+#define _DPST_HIST_INDEX_B				0x491D8
+#define DPST_HIST_INDEX(pipe)				_MMIO_PIPE(pipe, _DPST_HIST_INDEX_A, _DPST_HIST_INDEX_B)
+#define  DPST_HIST_BIN_INDEX_MASK			REG_GENMASK(4, 0)
+#define  DPST_HIST_BIN_INDEX(val)			REG_FIELD_PREP(DPST_HIST_BIN_INDEX_MASK, val)
+
+#define _DPST_HIST_BIN_A				0x490C4
+#define _DPST_HIST_BIN_B				0x491C4
+#define DPST_HIST_BIN(pipe)				_MMIO_PIPE(pipe, _DPST_HIST_BIN_A, _DPST_HIST_BIN_B)
+#define  DPST_HIST_BIN_BUSY				REG_BIT(31)
+#define  DPST_HIST_BIN_DATA_MASK				REG_GENMASK(30, 0)
+
+#define _DPST_IE_BIN_A					0x490CC
+#define _DPST_IE_BIN_B					0x491CC
+#define DPST_IE_BIN(pipe)				_MMIO_PIPE(pipe, _DPST_IE_BIN_A, _DPST_IE_BIN_B)
+#define	 DPST_IE_BIN_DATA_MASK				REG_GENMASK(9, 0)
+#define  DPST_IE_BIN_DATA(val)				REG_FIELD_PREP(DPST_IE_BIN_DATA_MASK, val)
+
+#define _DPST_IE_INDEX_A				0x490DC
+#define _DPST_IE_INDEX_B				0x491DC
+#define DPST_IE_INDEX(pipe)				_MMIO_PIPE(pipe, _DPST_IE_INDEX_A, _DPST_IE_INDEX_B)
+#define  DPST_IE_BIN_INDEX_MASK				REG_GENMASK(6, 0)
+#define  DPST_IE_BIN_INDEX(val)				REG_FIELD_PREP(DPST_IE_BIN_INDEX_MASK, val)
+
 #endif /* __INTEL_HISTOGRAM_REGS_H__ */
-- 
2.25.1