From: Kausal Malladi kausalmalladi@gmail.com
CHV/BSW platform supports two different pipe level gamma correction modes, which are: 1. Legacy 8-bit mode 2. 10-bit CGM (Color Gamut Mapping) mode
This patch does the following: 1. Attaches Gamma property to CRTC 3. Adds the core Gamma correction function for CHV/BSW 4. Adds Gamma correction macros
Signed-off-by: Shashank Sharma shashank.sharma@intel.com Signed-off-by: Kausal Malladi kausalmalladi@gmail.com --- drivers/gpu/drm/i915/i915_reg.h | 12 +++ drivers/gpu/drm/i915/intel_color_manager.c | 127 +++++++++++++++++++++++++++++ drivers/gpu/drm/i915/intel_color_manager.h | 21 +++++ 3 files changed, 160 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 67bf205..93aa1f9 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -7977,4 +7977,16 @@ enum skl_disp_power_wells { #define GEN9_VEBOX_MOCS_0 0xcb00 /* Video MOCS base register*/ #define GEN9_BLT_MOCS_0 0xcc00 /* Blitter MOCS base register*/
+/* Color Management */ +#define PIPEA_CGM_CONTROL (VLV_DISPLAY_BASE + 0x67A00) +#define PIPEB_CGM_CONTROL (VLV_DISPLAY_BASE + 0x69A00) +#define PIPEC_CGM_CONTROL (VLV_DISPLAY_BASE + 0x6BA00) +#define PIPEA_CGM_GAMMA (VLV_DISPLAY_BASE + 0x67000) +#define PIPEB_CGM_GAMMA (VLV_DISPLAY_BASE + 0x69000) +#define PIPEC_CGM_GAMMA (VLV_DISPLAY_BASE + 0x6B000) +#define _PIPE_CGM_CONTROL(pipe) \ + (_PIPE3(pipe, PIPEA_CGM_CONTROL, PIPEB_CGM_CONTROL, PIPEC_CGM_CONTROL)) +#define _PIPE_GAMMA_BASE(pipe) \ + (_PIPE3(pipe, PIPEA_CGM_GAMMA, PIPEB_CGM_GAMMA, PIPEC_CGM_GAMMA)) + #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 2ba3fd7..222924d 100644 --- a/drivers/gpu/drm/i915/intel_color_manager.c +++ b/drivers/gpu/drm/i915/intel_color_manager.c @@ -66,6 +66,127 @@ int intel_color_manager_set_pipe_degamma(struct drm_device *dev, return 0; }
+static int chv_set_gamma(struct drm_device *dev, struct drm_property_blob *blob, + struct drm_crtc *crtc) +{ + bool flag = false; + enum pipe pipe; + u8 red_int, blue_int, green_int; + u16 red_fract, green_fract, blue_fract; + u32 red, green, blue; + u32 cgm_control_reg = 0; + u32 cgm_gamma_reg = 0; + u32 count = 0, num_samples, word; + int ret = 0, length; + struct drm_r32g32b32 *correction_values = NULL; + struct drm_palette *gamma_data; + struct drm_i915_private *dev_priv = dev->dev_private; + + if (WARN_ON(!blob)) + return -EINVAL; + + gamma_data = (struct drm_palette *)blob->data; + + if (gamma_data->version != GAMMA_DATA_STRUCT_VERSION) { + DRM_DEBUG_KMS("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); + + switch (num_samples) { + 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)); + ret = 0; + break; + + case CHV_8BIT_GAMMA_MAX_VALS: + case CHV_10BIT_GAMMA_MAX_VALS: + + count = 0; + cgm_gamma_reg = _PIPE_GAMMA_BASE(pipe); + correction_values = (struct drm_r32g32b32 *)&gamma_data->lut; + + while (count < num_samples) { + 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 = CHV_MAX_GAMMA; + + green_int = _GAMMA_INT_PART(green); + if (green_int > GAMMA_INT_MAX) + green = CHV_MAX_GAMMA; + + red_int = _GAMMA_INT_PART(red); + if (red_int > GAMMA_INT_MAX) + red = CHV_MAX_GAMMA; + + blue_fract = _GAMMA_FRACT_PART(blue); + green_fract = _GAMMA_FRACT_PART(green); + red_fract = _GAMMA_FRACT_PART(red); + + blue_fract >>= CHV_10BIT_GAMMA_MSB_SHIFT; + green_fract >>= CHV_10BIT_GAMMA_MSB_SHIFT; + red_fract >>= CHV_10BIT_GAMMA_MSB_SHIFT; + + /* Green (25:16) and Blue (9:0) to be written */ + word = green_fract; + word <<= CHV_GAMMA_SHIFT_GREEN; + word |= blue_fract; + I915_WRITE(cgm_gamma_reg, word); + cgm_gamma_reg += 4; + + /* Red (9:0) to be written */ + word = red_fract; + I915_WRITE(cgm_gamma_reg, word); + + cgm_gamma_reg += 4; + count++; + + /* + * On CHV, the best supported Gamma capability is + * CGM block, that takes 257 samples. + * If user gives 256 samples (legacy mode), then + * duplicate the 256th value to 257th. + * "flag" is used to make sure it happens only once + */ + if (num_samples == CHV_8BIT_GAMMA_MAX_VALS + && count == CHV_8BIT_GAMMA_MAX_VALS + && !flag) { + count--; + flag = true; + } + } + + /* 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)); + ret = 0; + break; + + default: + DRM_ERROR("Invalid number of samples for Gamma LUT\n"); + ret = -EINVAL; + } + + return ret; +} + int intel_color_manager_set_pipe_gamma(struct drm_device *dev, struct drm_crtc_state *crtc_state, struct drm_mode_object *obj, uint32_t blob_id) @@ -134,5 +255,11 @@ void intel_attach_color_properties_to_crtc(struct drm_device *dev, DRM_DEBUG_DRIVER("Capabilities attached to CRTC\n"); }
+ if (config->cm_palette_after_ctm_property) { + drm_object_attach_property(mode_obj, + config->cm_palette_after_ctm_property, 0); + DRM_DEBUG_DRIVER("palette after CTM attached to CRTC\n"); + } + kfree(palette_caps); } diff --git a/drivers/gpu/drm/i915/intel_color_manager.h b/drivers/gpu/drm/i915/intel_color_manager.h index 402b825..5f800c9 100644 --- a/drivers/gpu/drm/i915/intel_color_manager.h +++ b/drivers/gpu/drm/i915/intel_color_manager.h @@ -28,6 +28,27 @@ #include <drm/drm_crtc_helper.h> #include "i915_drv.h"
+#define _GAMMA_INT_PART(value) (value >> GAMMA_INT_SHIFT) +#define _GAMMA_FRACT_PART(value) (value >> GAMMA_FRACT_SHIFT) + #define COLOR_STRUCT_VERSION 1 #define CHV_10BIT_GAMMA_MAX_VALS 257 #define CHV_DEGAMMA_MAX_VALS 65 + +/* Gamma correction */ +#define GAMMA_DATA_STRUCT_VERSION 1 +#define CHV_10BIT_GAMMA_MAX_VALS 257 +#define CHV_8BIT_GAMMA_MAX_VALS 256 +#define CHV_10BIT_GAMMA_MSB_SHIFT 6 +#define CHV_GAMMA_SHIFT_GREEN 16 + +/* Gamma values are u8.24 format */ +#define GAMMA_INT_SHIFT 24 +#define GAMMA_FRACT_SHIFT 8 +/* Max int value for Gamma is 1 */ +#define GAMMA_INT_MAX 1 +/* Max value for Gamma on CHV */ +#define CHV_MAX_GAMMA 0x10000 + +/* CHV CGM Block */ +#define CGM_GAMMA_EN (1 << 2)