[16/18] drm/i915: Gen8 pipe level Gamma correction
diff mbox

Message ID 1438879107-22819-17-git-send-email-shashank.sharma@intel.com
State New
Headers show

Commit Message

Sharma, Shashank Aug. 6, 2015, 4:38 p.m. UTC
From: Kausal Malladi <kausalmalladi@gmail.com>

BDW/SKL/BXT platforms support various Gamma correction modes, which are:
1. Legacy 8-bit mode
2. 10-bit mode
3. 10-bit Split Gamma mode
4. 12-bit mode

This patch does the following:
1. Adds the core function to program Gamma correction values for BDW/SKL/BXT
   platform
2. Adds Gamma correction macros/defines

Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Kausal Malladi <kausalmalladi@gmail.com>
---
 drivers/gpu/drm/i915/i915_reg.h            |  17 +-
 drivers/gpu/drm/i915/intel_color_manager.c | 269 +++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_color_manager.h |  16 ++
 3 files changed, 301 insertions(+), 1 deletion(-)

Patch
diff mbox

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 9ce259e..92233ce 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5591,7 +5591,9 @@  enum skl_disp_power_wells {
 
 #define _GAMMA_MODE_A		0x4a480
 #define _GAMMA_MODE_B		0x4ac80
-#define GAMMA_MODE(pipe) _PIPE(pipe, _GAMMA_MODE_A, _GAMMA_MODE_B)
+#define _GAMMA_MODE_C		0x4b480
+#define GAMMA_MODE(pipe) \
+	_PIPE3(pipe, _GAMMA_MODE_A, _GAMMA_MODE_B, _GAMMA_MODE_C)
 #define GAMMA_MODE_MODE_MASK	(3 << 0)
 #define GAMMA_MODE_MODE_8BIT	(0 << 0)
 #define GAMMA_MODE_MODE_10BIT	(1 << 0)
@@ -7934,6 +7936,14 @@  enum skl_disp_power_wells {
 #define PIPEA_CGM_CSC				(VLV_DISPLAY_BASE + 0x67900)
 #define PIPEB_CGM_CSC				(VLV_DISPLAY_BASE + 0x69900)
 #define PIPEC_CGM_CSC				(VLV_DISPLAY_BASE + 0x6B900)
+
+#define PAL_PREC_INDEX_A			0x4A400
+#define PAL_PREC_INDEX_B			0x4AC00
+#define PAL_PREC_INDEX_C			0x4B400
+#define PAL_PREC_DATA_A				0x4A404
+#define PAL_PREC_DATA_B				0x4AC04
+#define PAL_PREC_DATA_C				0x4B404
+
 #define _PIPE_CGM_CONTROL(pipe) \
 	(_PIPE3(pipe, PIPEA_CGM_CONTROL, PIPEB_CGM_CONTROL, PIPEC_CGM_CONTROL))
 #define _PIPE_GAMMA_BASE(pipe) \
@@ -7943,4 +7953,9 @@  enum skl_disp_power_wells {
 #define _PIPE_CSC_BASE(pipe) \
 	(_PIPE3(pipe, PIPEA_CGM_CSC, PIPEB_CGM_CSC, PIPEC_CGM_CSC))
 
+#define _PREC_PAL_INDEX(pipe) \
+	(_PIPE3(pipe, PAL_PREC_INDEX_A, PAL_PREC_INDEX_B, PAL_PREC_INDEX_C))
+#define _PREC_PAL_DATA(pipe) \
+	(_PIPE3(pipe, PAL_PREC_DATA_A, PAL_PREC_DATA_B, PAL_PREC_DATA_C))
+
 #endif /* _I915_REG_H_ */
diff --git a/drivers/gpu/drm/i915/intel_color_manager.c b/drivers/gpu/drm/i915/intel_color_manager.c
index bc77ab5..a894f4c 100644
--- a/drivers/gpu/drm/i915/intel_color_manager.c
+++ b/drivers/gpu/drm/i915/intel_color_manager.c
@@ -120,6 +120,40 @@  int chv_set_csc(struct drm_device *dev, struct drm_property_blob *blob,
 	return 0;
 }
 
+u32 gen9_write_10bit_gamma_precision(u32 red, u32 green, u32 blue)
+{
+	u32 word;
+	u8 blue_int, green_int, red_int;
+	u16 blue_fract, green_fract, red_fract;
+
+	blue_int = _GAMMA_INT_PART(blue);
+	if (blue_int > GAMMA_INT_MAX)
+		blue = GEN9_MAX_GAMMA;
+	green_int = _GAMMA_INT_PART(green);
+	if (green_int > GAMMA_INT_MAX)
+		green = GEN9_MAX_GAMMA;
+	red_int = _GAMMA_INT_PART(red);
+	if (red_int > GAMMA_INT_MAX)
+		red = GEN9_MAX_GAMMA;
+
+	blue_fract = _GAMMA_FRACT_PART(blue);
+	green_fract = _GAMMA_FRACT_PART(green);
+	red_fract = _GAMMA_FRACT_PART(red);
+
+	blue_fract >>= GEN9_10BIT_GAMMA_MSB_SHIFT;
+	green_fract >>= GEN9_10BIT_GAMMA_MSB_SHIFT;
+	red_fract >>= GEN9_10BIT_GAMMA_MSB_SHIFT;
+
+	/* Red (29:20) Green (19:10) and Blue (9:0) */
+	word = red_fract;
+	word <<= GEN9_GAMMA_SHIFT;
+	word = word | green_fract;
+	word <<= GEN9_GAMMA_SHIFT;
+	word = word | blue_fract;
+
+	return word;
+}
+
 int chv_set_degamma(struct drm_device *dev, struct drm_property_blob *blob,
 		struct drm_crtc *crtc)
 {
@@ -225,6 +259,238 @@  int chv_set_degamma(struct drm_device *dev, struct drm_property_blob *blob,
 	return ret;
 }
 
+int gen9_set_gamma(struct drm_device *dev, struct drm_property_blob *blob,
+		   struct drm_crtc *crtc)
+{
+	u8 blue_int, green_int, red_int;
+	u16 blue_fract, green_fract, red_fract;
+	u16 blue_odd, green_odd, red_odd;
+	u16 blue_even, green_even, red_even;
+	int ret, count, num_samples, length;
+	enum pipe pipe;
+	u32 blue, green, red;
+	u32 mode, pal_prec_index, pal_prec_data;
+	u32 cgm_control_reg = 0;
+	u32 index, word;
+	struct drm_palette *gamma_data;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct drm_r32g32b32 *correction_values = NULL;
+
+	if (!blob) {
+		DRM_ERROR("Null Blob\n");
+		return -EINVAL;
+	}
+
+	gamma_data = (struct drm_palette *)blob->data;
+
+	if (gamma_data->version != GEN9_GAMMA_DATA_STRUCT_VERSION) {
+		DRM_ERROR("Invalid Gamma Data struct version\n");
+		return -EINVAL;
+	}
+
+	pipe = to_intel_crtc(crtc)->pipe;
+	num_samples = gamma_data->num_samples;
+	length = num_samples * sizeof(struct drm_r32g32b32);
+	mode = I915_READ(GAMMA_MODE(pipe));
+
+	pal_prec_index = _PREC_PAL_INDEX(pipe);
+	pal_prec_data = _PREC_PAL_DATA(pipe);
+
+	correction_values = (struct drm_r32g32b32 *)&gamma_data->lut;
+	index = I915_READ(pal_prec_index);
+	switch (num_samples) {
+
+	case GEN9_8BIT_GAMMA_MAX_VALS:
+
+		/* Legacy palette */
+		pal_prec_data = LGC_PALETTE(pipe);
+
+		count = 0;
+		while (count < GEN9_8BIT_GAMMA_MAX_VALS) {
+			blue = correction_values[count].b32;
+			green = correction_values[count].g32;
+			red = correction_values[count].r32;
+
+			blue_int = _GAMMA_INT_PART(blue);
+			if (blue_int > GAMMA_INT_MAX)
+				blue = GEN9_MAX_GAMMA;
+			green_int = _GAMMA_INT_PART(green);
+			if (green_int > GAMMA_INT_MAX)
+				green = GEN9_MAX_GAMMA;
+			red_int = _GAMMA_INT_PART(red);
+			if (red_int > GAMMA_INT_MAX)
+				red = GEN9_MAX_GAMMA;
+
+			blue_fract = _GAMMA_FRACT_PART(blue);
+			green_fract = _GAMMA_FRACT_PART(green);
+			red_fract = _GAMMA_FRACT_PART(red);
+
+			blue_fract >>= GEN9_8BIT_GAMMA_MSB_SHIFT;
+			green_fract >>= GEN9_8BIT_GAMMA_MSB_SHIFT;
+			red_fract >>= GEN9_8BIT_GAMMA_MSB_SHIFT;
+
+			/* Red (23:16) Green (15:8) and Blue (7:0) */
+			word = red_fract;
+			word <<= GEN9_8BIT_GAMMA_SHIFT;
+			word = word | green_fract;
+			word <<= GEN9_8BIT_GAMMA_SHIFT;
+			word = word | blue_fract;
+
+			I915_WRITE(pal_prec_data, word);
+			pal_prec_data += 4;
+
+			count++;
+		}
+
+		mode &= ~GAMMA_MODE_MODE_MASK;
+		I915_WRITE(GAMMA_MODE(pipe), mode | GAMMA_MODE_MODE_8BIT);
+		DRM_DEBUG_DRIVER("Gamma registers updated on %c\n",
+				pipe_name(pipe));
+		ret = 0;
+		break;
+
+	case GEN9_SPLITGAMMA_MAX_VALS:
+
+		index |= GEN9_INDEX_AUTO_INCREMENT | GEN9_INDEX_SPLIT_MODE;
+		I915_WRITE(pal_prec_index, index);
+
+		count = 0;
+		while (count < GEN9_SPLITGAMMA_MAX_VALS) {
+			blue = correction_values[count].b32;
+			green = correction_values[count].g32;
+			red = correction_values[count].r32;
+
+			word = gen9_write_10bit_gamma_precision(red,
+					green, blue);
+			I915_WRITE(pal_prec_data, word);
+			count++;
+		}
+
+		mode &= ~GAMMA_MODE_MODE_MASK;
+		I915_WRITE(GAMMA_MODE(pipe), mode | GAMMA_MODE_MODE_SPLIT);
+		DRM_DEBUG_DRIVER("Gamma registers updated on %c\n",
+				pipe_name(pipe));
+		ret = 0;
+		break;
+
+	case GEN9_12BIT_GAMMA_MAX_VALS:
+
+		index |= GEN9_INDEX_AUTO_INCREMENT;
+		index &= ~GEN9_INDEX_SPLIT_MODE;
+		I915_WRITE(pal_prec_index, index);
+
+		count = 0;
+		while (count < GEN9_12BIT_GAMMA_MAX_VALS) {
+			blue = correction_values[count].b32;
+			green = correction_values[count].g32;
+			red = correction_values[count].r32;
+
+			blue_int = _GAMMA_INT_PART(blue);
+			if (blue_int > GAMMA_INT_MAX)
+				blue = GEN9_MAX_GAMMA;
+			green_int = _GAMMA_INT_PART(green);
+			if (green_int > GAMMA_INT_MAX)
+				green = GEN9_MAX_GAMMA;
+			red_int = _GAMMA_INT_PART(red);
+			if (red_int > GAMMA_INT_MAX)
+				red = GEN9_MAX_GAMMA;
+
+			blue_fract = _GAMMA_FRACT_PART(blue);
+			green_fract = _GAMMA_FRACT_PART(green);
+			red_fract = _GAMMA_FRACT_PART(red);
+
+			/* Odd index */
+			if (count % 2 == 0) {
+				blue_odd = blue_fract >>
+					GEN9_12BIT_GAMMA_ODD_SHIFT;
+				green_odd = green_fract >>
+					GEN9_12BIT_GAMMA_ODD_SHIFT;
+				red_odd = red_fract >>
+					GEN9_12BIT_GAMMA_ODD_SHIFT;
+
+				word = red_odd;
+				word = word << GEN9_GAMMA_SHIFT;
+				word = word | green_odd;
+				word = word << GEN9_GAMMA_SHIFT;
+				word = word | blue_odd;
+			} else {
+				blue_even = blue_fract <<
+					GEN9_12BIT_GAMMA_EVEN_SHIFT1 >>
+					GEN9_12BIT_GAMMA_EVEN_SHIFT2;
+				green_even = green_fract <<
+					GEN9_12BIT_GAMMA_EVEN_SHIFT1 >>
+					GEN9_12BIT_GAMMA_EVEN_SHIFT2;
+				red_even = red_fract <<
+					GEN9_12BIT_GAMMA_EVEN_SHIFT1 >>
+					GEN9_12BIT_GAMMA_EVEN_SHIFT2;
+
+				word = red_even;
+				word = word << GEN9_GAMMA_SHIFT;
+				word = word | green_even;
+				word = word << GEN9_GAMMA_SHIFT;
+				word = word | blue_even;
+			}
+			I915_WRITE(pal_prec_data, word);
+			count++;
+		}
+
+		mode &= ~GAMMA_MODE_MODE_MASK;
+		I915_WRITE(GAMMA_MODE(pipe), mode | GAMMA_MODE_MODE_12BIT);
+		DRM_DEBUG_DRIVER("Gamma registers updated on %c\n",
+				pipe_name(pipe));
+		ret = 0;
+		break;
+
+	case GEN9_10BIT_GAMMA_MAX_VALS:
+
+		index |= GEN9_INDEX_AUTO_INCREMENT;
+		index &= ~GEN9_INDEX_SPLIT_MODE;
+		I915_WRITE(pal_prec_index, index);
+
+		count = 0;
+		while (count < GEN9_10BIT_GAMMA_MAX_VALS) {
+			blue = correction_values[count].b32;
+			green = correction_values[count].g32;
+			red = correction_values[count].r32;
+
+			word = gen9_write_10bit_gamma_precision(red,
+						green, blue);
+			I915_WRITE(pal_prec_data, word);
+			count++;
+		}
+
+		mode &= ~GAMMA_MODE_MODE_MASK;
+		I915_WRITE(GAMMA_MODE(pipe), mode | GAMMA_MODE_MODE_10BIT);
+		DRM_DEBUG_DRIVER("Gamma registers updated on %c\n",
+				pipe_name(pipe));
+		ret = 0;
+		break;
+
+	case 0:
+		/* Disable Gamma functionality on Pipe - CGM Block */
+		cgm_control_reg = I915_READ(_PIPE_CGM_CONTROL(pipe));
+		cgm_control_reg &= ~CGM_GAMMA_EN;
+		I915_WRITE(_PIPE_CGM_CONTROL(pipe), cgm_control_reg);
+
+		DRM_DEBUG_DRIVER("Gamma disabled on Pipe %c\n",
+				pipe_name(pipe));
+		return 0;
+
+	default:
+		DRM_ERROR("Invalid number of samples\n");
+		return -EINVAL;
+	}
+
+	/* Enable (CGM) Gamma on Pipe */
+	I915_WRITE(_PIPE_CGM_CONTROL(pipe),
+		I915_READ(_PIPE_CGM_CONTROL(pipe))
+		| CGM_GAMMA_EN);
+	DRM_DEBUG_DRIVER("CGM Gamma enabled on Pipe %c\n",
+		pipe_name(pipe));
+
+	return ret;
+}
+
 int chv_set_gamma(struct drm_device *dev, struct drm_property_blob *blob,
 		  struct drm_crtc *crtc)
 {
@@ -360,6 +626,8 @@  void intel_color_manager_crtc_commit(struct drm_device *dev,
 		/* Gamma correction is platform specific */
 		if (IS_CHERRYVIEW(dev))
 			ret = chv_set_gamma(dev, blob, crtc);
+		else if (IS_BROADWELL(dev) || IS_GEN9(dev))
+			ret = gen9_set_gamma(dev, blob, crtc);
 
 		if (ret)
 			DRM_ERROR("set Gamma correction failed\n");
@@ -390,6 +658,7 @@  void intel_color_manager_crtc_commit(struct drm_device *dev,
 		else
 			DRM_DEBUG_DRIVER("CSC correction success\n");
 	}
+
 }
 
 int intel_color_manager_set_pipe_csc(struct drm_device *dev,
diff --git a/drivers/gpu/drm/i915/intel_color_manager.h b/drivers/gpu/drm/i915/intel_color_manager.h
index 78de1a2..fa9d0b0 100644
--- a/drivers/gpu/drm/i915/intel_color_manager.h
+++ b/drivers/gpu/drm/i915/intel_color_manager.h
@@ -37,6 +37,9 @@ 
 
 #define GEN9_PALETTE_STRUCT_VERSION		1
 #define GEN9_SPLITGAMMA_MAX_VALS		512
+#define GEN9_8BIT_GAMMA_MAX_VALS		256
+#define GEN9_10BIT_GAMMA_MAX_VALS		1024
+#define GEN9_12BIT_GAMMA_MAX_VALS		513
 
 /* Gamma correction */
 #define CHV_GAMMA_DATA_STRUCT_VERSION		1
@@ -52,6 +55,19 @@ 
 /* Max value for Gamma on CHV */
 #define CHV_MAX_GAMMA				0x10000
 
+/* Gen 9 */
+#define GEN9_GAMMA_DATA_STRUCT_VERSION		1
+#define GEN9_MAX_GAMMA				0x10000
+#define GEN9_10BIT_GAMMA_MSB_SHIFT		6
+#define GEN9_GAMMA_SHIFT			10
+#define GEN9_INDEX_AUTO_INCREMENT		(1 << 15)
+#define GEN9_INDEX_SPLIT_MODE			(1 << 31)
+#define GEN9_8BIT_GAMMA_MSB_SHIFT		8
+#define GEN9_8BIT_GAMMA_SHIFT			8
+#define GEN9_12BIT_GAMMA_ODD_SHIFT		6
+#define GEN9_12BIT_GAMMA_EVEN_SHIFT1		10
+#define GEN9_12BIT_GAMMA_EVEN_SHIFT2		6
+
 /* DeGamma correction */
 #define CHV_DEGAMMA_DATA_STRUCT_VERSION		1
 #define CHV_DEGAMMA_MSB_SHIFT			2