[PATCH 10/12] drm/i915: Add DeGamma correction for CHV/BSW

Kausal Malladi
2015-07-03T03:31:45Z

CHV/BSW supports DeGamma color correction feature, which linearizes all
the non-linear color values. This will be applied before Color
Transformation.

This patch does the following:
1. Adds the core function to program DeGamma correction values for
CHV/BSW platform
2. Adds DeGamma correction macros/defines

Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Kausal Malladi <Kausal.Malladi@intel.com>
---
drivers/gpu/drm/i915/i915_reg.h | 4 ++
drivers/gpu/drm/i915/intel_atomic.c | 2 +
drivers/gpu/drm/i915/intel_color_manager.c | 110 +++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_color_manager.h | 5 ++
drivers/gpu/drm/i915/intel_drv.h | 2 +
5 files changed, 123 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 36672e7..58a1414 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7903,11 +7903,15 @@ enum skl_disp_power_wells {
/* Color Management */
#define PIPEA_CGM_CONTROL (VLV_DISPLAY_BASE + 0x67A00)
#define PIPEA_CGM_GAMMA_MIN (VLV_DISPLAY_BASE + 0x67000)
+#define PIPEA_CGM_DEGAMMA_MIN (VLV_DISPLAY_BASE + 0x66000)
#define CGM_OFFSET 0x2000
#define GAMMA_OFFSET 0x2000
+#define DEGAMMA_OFFSET 0x2000
#define _PIPE_CGM_CONTROL(pipe) \
(PIPEA_CGM_CONTROL + (pipe * CGM_OFFSET))
#define _PIPE_GAMMA_BASE(pipe) \
(PIPEA_CGM_GAMMA_MIN + (pipe * GAMMA_OFFSET))
+#define _PIPE_DEGAMMA_BASE(pipe) \
+ (PIPEA_CGM_DEGAMMA_MIN + (pipe * DEGAMMA_OFFSET))

#endif /* _I915_REG_H_ */
diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
index 21f0ac2..570af9d 100644
--- a/drivers/gpu/drm/i915/intel_atomic.c
+++ b/drivers/gpu/drm/i915/intel_atomic.c
@@ -478,6 +478,8 @@ int intel_crtc_atomic_set_property(struct drm_crtc *crtc,

if (property == config->prop_palette_after_ctm)
return intel_color_manager_set_gamma(dev, &crtc->base, val);
+ if (property == config->prop_palette_before_ctm)
+ return intel_color_manager_set_degamma(dev, &crtc->base, val);

DRM_DEBUG_KMS("Unknown crtc property '%s'\n", property->name);
return -EINVAL;
diff --git a/drivers/gpu/drm/i915/intel_color_manager.c b/drivers/gpu/drm/i915/intel_color_manager.c
index 84cc3e47..21c499f 100644
--- a/drivers/gpu/drm/i915/intel_color_manager.c
+++ b/drivers/gpu/drm/i915/intel_color_manager.c
@@ -27,6 +27,105 @@

#include "intel_color_manager.h"

+int chv_set_degamma(struct drm_device *dev, uint32_t blob_id,
+ struct drm_crtc *crtc)
+{
+ struct drm_palette *degamma_data;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct drm_property_blob *blob;
+ struct drm_mode_config *config = &dev->mode_config;
+ u32 cgm_control_reg = 0;
+ u32 cgm_degamma_reg = 0;
+ enum pipe pipe;
+ u16 red, green, blue;
+ u32 count = 0;
+ struct drm_r32g32b32 *correction_values = NULL;
+ u32 num_samples;
+ u32 word;
+ int ret = 0, length;
+
+ blob = drm_property_lookup_blob(dev, blob_id);
+ if (!blob) {
+ DRM_ERROR("Invalid Blob ID\n");
+ return -EINVAL;
+ }
+
+ degamma_data = (struct drm_palette *)blob->data;
+
+ if (degamma_data->version != CHV_DEGAMMA_DATA_STRUCT_VERSION) {
+ DRM_ERROR("Invalid DeGamma Data struct version\n");
+ return -EINVAL;
+ }
+
+ pipe = to_intel_crtc(crtc)->pipe;
+ num_samples = degamma_data->palette_num_samples;
+ length = num_samples * sizeof(struct drm_r32g32b32);
+
+ if (num_samples == 0) {
+
+ /* Disable DeGamma functionality on Pipe - CGM Block */
+ cgm_control_reg = I915_READ(_PIPE_CGM_CONTROL(pipe));
+ cgm_control_reg &= ~CGM_DEGAMMA_EN;
+ I915_WRITE(_PIPE_CGM_CONTROL(pipe), cgm_control_reg);
+
+ DRM_DEBUG_DRIVER("DeGamma disabled on Pipe %c\n",
+ pipe_name(pipe));
+ ret = 0;
+ } else if (num_samples == CHV_DEGAMMA_MAX_VALS) {
+ cgm_degamma_reg = _PIPE_DEGAMMA_BASE(pipe);
+
+ count = 0;
+ correction_values =
+ (struct drm_r32g32b32 *)&degamma_data->palette_lut;
+ while (count < CHV_DEGAMMA_MAX_VALS) {
+ blue = correction_values[count].b32;
+ green = correction_values[count].g32;
+ red = correction_values[count].r32;
+
+ blue = blue >> CHV_DEGAMMA_MSB_SHIFT;
+ green = green >> CHV_DEGAMMA_MSB_SHIFT;
+ red = red >> CHV_DEGAMMA_MSB_SHIFT;
+
+ /* Green (29:16) and Blue (13:0) in DWORD1 */
+ word = (green << CHV_DEGAMMA_GREEN_SHIFT) | blue;
+ I915_WRITE(cgm_degamma_reg, word);
+
+ cgm_degamma_reg += 4;
+
+ /* Red (13:0) to be written to DWORD2 */
+ word = red;
+ I915_WRITE(cgm_degamma_reg, word);
+
+ cgm_degamma_reg += 4;
+ count++;
+ }
+
+ DRM_DEBUG_DRIVER("DeGamma LUT loaded for Pipe %c\n",
+ pipe_name(pipe));
+
+ /* Enable DeGamma on Pipe */
+ I915_WRITE(_PIPE_CGM_CONTROL(pipe),
+ I915_READ(_PIPE_CGM_CONTROL(pipe)) | CGM_DEGAMMA_EN);
+
+ DRM_DEBUG_DRIVER("DeGamma correction enabled on Pipe %c\n",
+ pipe_name(pipe));
+ ret = 0;
+ } else {
+ DRM_ERROR("Invalid number of samples for DeGamma LUT\n");
+ return -EINVAL;
+ }
+
+ ret = drm_property_replace_global_blob(dev, &blob, length,
+ (void *) degamma_data, &crtc->base,
+ config->prop_palette_before_ctm);
+
+ if (ret) {
+ DRM_ERROR("Error updating DeGamma blob\n");
+ return -EFAULT;
+ }
+
+ return ret;
+}
int chv_set_gamma(struct drm_device *dev, uint32_t blob_id,
struct drm_crtc *crtc)
{
@@ -181,6 +280,17 @@ int intel_color_manager_set_gamma(struct drm_device *dev,
return -EINVAL;
}

+int intel_color_manager_set_degamma(struct drm_device *dev,
+ struct drm_mode_object *obj, uint32_t blob_id)
+{
+ struct drm_crtc *crtc = obj_to_crtc(obj);
+
+ if (IS_CHERRYVIEW(dev))
+ return chv_set_degamma(dev, blob_id, crtc);
+
+ return -EINVAL;
+}
+
int get_chv_pipe_capabilities(struct drm_device *dev,
struct drm_color_caps *color_caps, struct drm_crtc *crtc)
{
diff --git a/drivers/gpu/drm/i915/intel_color_manager.h b/drivers/gpu/drm/i915/intel_color_manager.h
index d83567a..64468c1 100644
--- a/drivers/gpu/drm/i915/intel_color_manager.h
+++ b/drivers/gpu/drm/i915/intel_color_manager.h
@@ -32,6 +32,7 @@
#define CHV_CTM_STRUCT_VERSION 1
#define CHV_PLATFORM_STRUCT_VERSION 1
#define CHV_GAMMA_DATA_STRUCT_VERSION 1
+#define CHV_DEGAMMA_DATA_STRUCT_VERSION 1

#define CHV_MAX_PALETTE_CAPS_BEFORE_CTM 1
#define CHV_MAX_PALETTE_CAPS_AFTER_CTM 2
@@ -51,6 +52,9 @@
#define CHV_10BIT_GAMMA_MSB_SHIFT 6
#define CHV_GAMMA_SHIFT_GREEN 16

+#define CHV_DEGAMMA_MSB_SHIFT 2
+#define CHV_DEGAMMA_GREEN_SHIFT 16
+
#define CHV_CSC_COEFF_MAX_PRECISION 12
#define CHV_CSC_COEFF_MAX_INT 7
#define CHV_CSC_COEFF_MIN_INT -7
@@ -58,3 +62,4 @@
/* CHV CGM Block */
/* Bit 2 to be enabled in CGM block for CHV */
#define CGM_GAMMA_EN 4
+#define CGM_DEGAMMA_EN 1
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index a7aaadf..f47d9d6 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1455,5 +1455,7 @@ void intel_color_manager_attach(struct drm_device *dev,
struct drm_mode_object *mode_obj);
int intel_color_manager_set_gamma(struct drm_device *dev,
struct drm_mode_object *obj, uint32_t blob_id);
+int intel_color_manager_set_degamma(struct drm_device *dev,
+ struct drm_mode_object *obj, uint32_t blob_id);

#endif /* __INTEL_DRV_H__ */
--
2.4.5

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