[v3 4/7] drm/i915/icl: Add support for multi segmented gamma mode

Uma Shankar
2019-04-12T10:21:00Z

Gen11 introduced a new gamma mode i.e, multi segmented
gamma mode. Added support for the same.

v2: Aligned to just 1 property interface as suggested by
Ville. Fixed Ville's review comments.

Signed-off-by: Uma Shankar <uma.shankar@intel.com>
---
drivers/gpu/drm/i915/intel_color.c | 166 ++++++++++++++++++++++++++++++++++++-
include/drm/drm_crtc.h | 3 +
2 files changed, 165 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_color.c b/drivers/gpu/drm/i915/intel_color.c
index c433215..d4ce1ed 100644
--- a/drivers/gpu/drm/i915/intel_color.c
+++ b/drivers/gpu/drm/i915/intel_color.c
@@ -58,6 +58,12 @@

#define ILK_CSC_POSTOFF_LIMITED_RANGE (16 * (1 << 12) / 255)

+#define LEGACY_PALETTE_MODE_8BIT BIT(0)
+#define PRECISION_PALETTE_MODE_10BIT BIT(1)
+#define INTERPOLATED_GAMMA_MODE_12BIT BIT(2)
+#define MULTI_SEGMENTED_GAMMA_MODE_12BIT BIT(3)
+#define SPLIT_GAMMA_MODE_12BIT BIT(4)
+
static const u16 ilk_csc_off_zero[3] = {};

static const u16 ilk_csc_coeff_identity[9] = {
@@ -93,6 +99,22 @@
0x0800, 0x0100, 0x0800,
};

+/* ilk+ "12.4" interpolated format (high 10 bits) */
+static u32 ilk_lut_12p4_ldw(const struct drm_color_lut *color)
+{
+ return (color->red >> 6) << 20 |
+ (color->green >> 6) << 10 |
+ (color->blue >> 6);
+}
+
+/* ilk+ "12.4" interpolated format (low 6 bits) */
+static u32 ilk_lut_12p4_udw(const struct drm_color_lut *color)
+{
+ return (color->red & 0x3f) << 24 |
+ (color->green & 0x3f) << 14 |
+ (color->blue & 0x3f);
+}
+
static bool lut_is_legacy(const struct drm_property_blob *lut)
{
return drm_color_lut_size(lut) == LEGACY_LUT_LENGTH;
@@ -781,6 +803,118 @@ static void glk_load_luts(const struct intel_crtc_state *crtc_state)
}
}

+static void icl_program_coarse_segment_lut(const struct intel_crtc_state
+ *crtc_state,
+ struct drm_color_lut *gamma_lut,
+ u32 offset)
+{
+ struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
+ struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+ const struct drm_color_lut *lut = gamma_lut;
+ enum pipe pipe = crtc->pipe;
+ u32 i, lut_size, word;
+
+ WARN_ON(offset & ~PAL_PREC_INDEX_VALUE_MASK);
+
+ I915_WRITE(PREC_PAL_INDEX(pipe),
+ (offset ? PAL_PREC_SPLIT_MODE : 0) |
+ PAL_PREC_AUTO_INCREMENT |
+ offset);
+
+ if (lut && crtc_state->base.gamma_mode_type ==
+ MULTI_SEGMENTED_GAMMA_MODE_12BIT) {
+ lut_size = 9 + 514;
+ for (i = 9; i < lut_size; i++) {
+ /* For Even Index */
+ word = ilk_lut_12p4_udw(&lut[i]);
+
+ I915_WRITE(PREC_PAL_DATA(pipe), word);
+
+ /* For ODD index */
+ word = ilk_lut_12p4_ldw(&lut[i]);
+
+ I915_WRITE(PREC_PAL_DATA(pipe), word);
+ }
+ }
+
+ /*
+ * Program the max register to clamp values > 1.0.
+ * ToDo: Extend the ABI to be able to program values
+ * from 1.0
+ */
+ I915_WRITE(PREC_PAL_GC_MAX(pipe, 0), (1 << 16));
+ I915_WRITE(PREC_PAL_GC_MAX(pipe, 1), (1 << 16));
+ I915_WRITE(PREC_PAL_GC_MAX(pipe, 2), (1 << 16));
+
+ /*
+ * Program the max register to clamp values > 1.0.
+ * ToDo: Extend the ABI to be able to program values
+ * from 1.0 to 3.0
+ */
+ I915_WRITE(PREC_PAL_EXT_GC_MAX(pipe, 0), (1 << 16));
+ I915_WRITE(PREC_PAL_EXT_GC_MAX(pipe, 1), (1 << 16));
+ I915_WRITE(PREC_PAL_EXT_GC_MAX(pipe, 2), (1 << 16));
+
+ /*
+ * Program the gc max 2 register to clamp values > 1.0.
+ * ToDo: Extend the ABI to be able to program values
+ * from 3.0 to 7.0
+ */
+ if (INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv)) {
+ I915_WRITE(PREC_PAL_EXT2_GC_MAX(pipe, 0), (1 << 16));
+ I915_WRITE(PREC_PAL_EXT2_GC_MAX(pipe, 1), (1 << 16));
+ I915_WRITE(PREC_PAL_EXT2_GC_MAX(pipe, 2), (1 << 16));
+ }
+}
+
+static void icl_program_fine_segment_lut(const struct intel_crtc_state
+ *crtc_state,
+ struct drm_color_lut *gamma_lut,
+ u32 offset)
+{
+ struct drm_crtc *crtc = crtc_state->base.crtc;
+ struct drm_device *dev = crtc_state->base.crtc->dev;
+ struct drm_i915_private *dev_priv = to_i915(dev);
+ enum pipe pipe = to_intel_crtc(crtc)->pipe;
+ u32 i, word, lut_size = 9;
+
+ WARN_ON(offset & ~PAL_PREC_MULTI_SEGMENT_INDEX_VALUE_MASK);
+
+ I915_WRITE(PREC_PAL_MULTI_SEG_INDEX(pipe),
+ (PAL_PREC_AUTO_INCREMENT | offset));
+
+ if (gamma_lut) {
+ struct drm_color_lut *lut =
+ (struct drm_color_lut *)gamma_lut;
+
+ for (i = 0; i < lut_size; i++) {
+ /* For Even Index */
+ word = ilk_lut_12p4_udw(&lut[i]);
+
+ I915_WRITE(PREC_PAL_MULTI_SEG_DATA(pipe), word);
+
+ /* For ODD index */
+ word = ilk_lut_12p4_ldw(&lut[i]);
+
+ I915_WRITE(PREC_PAL_MULTI_SEG_DATA(pipe), word);
+ }
+ }
+}
+
+static void icl_load_gamma_multi_segmented_lut(const struct intel_crtc_state
+ *crtc_state, u32 offset)
+{
+ const struct drm_property_blob *gamma_lut_blob =
+ crtc_state->base.gamma_lut;
+ struct drm_color_lut *gamma_lut = NULL;
+
+ if (gamma_lut_blob)
+ gamma_lut = gamma_lut_blob->data;
+
+ icl_program_fine_segment_lut(crtc_state, gamma_lut, 0);
+ icl_program_coarse_segment_lut(crtc_state, gamma_lut, 0);
+}
+
static void icl_load_luts(const struct intel_crtc_state *crtc_state)
{
const struct drm_property_blob *gamma_lut = crtc_state->base.gamma_lut;
@@ -792,6 +926,9 @@ static void icl_load_luts(const struct intel_crtc_state *crtc_state)
if ((crtc_state->gamma_mode & GAMMA_MODE_MODE_MASK) ==
GAMMA_MODE_MODE_8BIT) {
i9xx_load_luts(crtc_state);
+ } else if (crtc_state->base.gamma_mode_type ==
+ MULTI_SEGMENTED_GAMMA_MODE_12BIT) {
+ icl_load_gamma_multi_segmented_lut(crtc_state, 0);
} else {
bdw_load_lut_10(crtc, gamma_lut, PAL_PREC_INDEX_VALUE(0));
ivb_load_lut_10_max(crtc);
@@ -1186,10 +1323,28 @@ static int glk_color_check(struct intel_crtc_state *crtc_state)
return 0;
}

-static u32 icl_gamma_mode(const struct intel_crtc_state *crtc_state)
+static u32 icl_gamma_mode(struct intel_crtc_state *crtc_state)
{
+ struct drm_device *dev = crtc_state->base.crtc->dev;
+ struct drm_mode_config *config = &dev->mode_config;
+ struct drm_property *property = config->gamma_mode_property;
+ struct drm_property_enum *prop_enum;
+ u32 index = 0;
u32 gamma_mode = 0;

+ list_for_each_entry(prop_enum, &property->enum_list, head) {
+ if (prop_enum->value == crtc_state->base.gamma_mode) {
+ if (!strcmp(prop_enum->name,
+ "multi-segmented gamma")) {
+ crtc_state->base.gamma_mode_type =
+ MULTI_SEGMENTED_GAMMA_MODE_12BIT;
+ DRM_INFO("multi-segment enabled\n");
+ }
+ break;
+ }
+ index++;
+ }
+
if (crtc_state->base.degamma_lut)
gamma_mode |= PRE_CSC_GAMMA_ENABLE;

@@ -1200,6 +1355,9 @@ static u32 icl_gamma_mode(const struct intel_crtc_state *crtc_state)
if (!crtc_state->base.gamma_lut ||
crtc_state_is_legacy_gamma(crtc_state))
gamma_mode |= GAMMA_MODE_MODE_8BIT;
+ else if (crtc_state->base.gamma_mode_type ==
+ MULTI_SEGMENTED_GAMMA_MODE_12BIT)
+ gamma_mode |= GAMMA_MODE_MODE_12BIT_MULTI_SEGMENTED;
else
gamma_mode |= GAMMA_MODE_MODE_10BIT;

@@ -1755,7 +1913,7 @@ void intel_color_init(struct intel_crtc *crtc)

drm_color_add_gamma_mode_range(&dev_priv->drm,
"8bit gamma",
- i9xx_gamma_8,
+ i9xx_gamma_8,
sizeof(i9xx_gamma_8));
drm_color_add_gamma_mode_range(&dev_priv->drm,
"10bit gamma",
@@ -1798,8 +1956,8 @@ void intel_color_init(struct intel_crtc *crtc)

drm_color_add_gamma_mode_range(&dev_priv->drm,
"8bit gamma or degamma",
- ilk_gamma_degamma_8,
- sizeof(ilk_gamma_degamma_8));
+ ilk_gamma_degamma_8,
+ sizeof(ilk_gamma_degamma_8));
drm_color_add_gamma_mode_range(&dev_priv->drm,
"10bit gamma or degamma",
ilk_gamma_degamma_10,
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index f2e60bd..f789359 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -255,6 +255,9 @@ struct drm_crtc_state {
*/
u32 gamma_mode;

+ /* Gamma mode type programmed on the pipe */
+ u32 gamma_mode_type;
+
/**
* @degamma_lut:
*
--
1.9.1