[Intel-gfx] [RFC v2 21/22] drm/i915/xelpd: Program Plane Gamma Registers

Uma Shankar
2021-09-06T21:02:14Z

Extract the LUT and program plane gamma registers.
Enabled multi segmented lut as well.

Signed-off-by: Uma Shankar <uma.shankar@intel.com>
---
drivers/gpu/drm/i915/display/intel_color.c | 89 ++++++++++++++++++++++
drivers/gpu/drm/i915/i915_reg.h | 9 ++-
2 files changed, 94 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
index b4cad5c92c85..e5f168a32932 100644
--- a/drivers/gpu/drm/i915/display/intel_color.c
+++ b/drivers/gpu/drm/i915/display/intel_color.c
@@ -27,6 +27,9 @@
#include "intel_de.h"
#include "intel_display_types.h"
#include "intel_sprite.h"
+
+#include "skl_universal_plane.h"
+
#include <drm/drm_plane.h>

#define CTM_COEFF_SIGN (1ULL << 63)
@@ -2433,16 +2436,102 @@ static void d13_program_plane_degamma_lut(const struct drm_plane_state *state,
}
}

+static void d13_program_plane_gamma_lut(const struct drm_plane_state *state,
+ struct drm_color_lut_ext *gamma_lut,
+ u32 offset)
+{
+ struct drm_i915_private *dev_priv = to_i915(state->plane->dev);
+ enum pipe pipe = to_intel_plane(state->plane)->pipe;
+ enum plane_id plane = to_intel_plane(state->plane)->id;
+ u32 i, lut_size;
+
+ if (icl_is_hdr_plane(dev_priv, plane)) {
+ intel_de_write(dev_priv, PLANE_POST_CSC_GAMC_INDEX_ENH(pipe, plane, 0),
+ offset | PLANE_PAL_PREC_AUTO_INCREMENT);
+ if (gamma_lut) {
+ lut_size = 32;
+ for (i = 0; i < lut_size; i++) {
+ u64 word = drm_color_lut_extract_ext(gamma_lut[i].green, 24);
+ u32 lut_val = (word & 0xffffff);
+
+ intel_de_write(dev_priv, PLANE_POST_CSC_GAMC_DATA_ENH(pipe, plane, 0),
+ lut_val);
+ }
+
+ do {
+ /* Program the max register to clamp values > 1.0. */
+ intel_de_write(dev_priv, PLANE_POST_CSC_GAMC_DATA_ENH(pipe, plane, 0),
+ gamma_lut[i].green);
+ } while (i++ < 34);
+ } else {
+ lut_size = 32;
+ for (i = 0; i < lut_size; i++) {
+ u32 v = (i * ((1 << 24) - 1)) / (lut_size - 1);
+
+ intel_de_write(dev_priv, PLANE_POST_CSC_GAMC_DATA_ENH(pipe, plane, 0), v);
+ }
+
+ do {
+ intel_de_write(dev_priv, PLANE_POST_CSC_GAMC_DATA_ENH(pipe, plane, 0),
+ 1 << 24);
+ } while (i++ < 34);
+ }
+
+ intel_de_write(dev_priv, PLANE_POST_CSC_GAMC_INDEX_ENH(pipe, plane, 0), 0);
+ } else {
+ lut_size = 32;
+ /*
+ * First 3 planes are HDR, so reduce by 3 to get to the right
+ * SDR plane offset
+ */
+ plane = plane - 3;
+
+ intel_de_write(dev_priv, PLANE_POST_CSC_GAMC_INDEX(pipe, plane, 0),
+ offset | PLANE_PAL_PREC_AUTO_INCREMENT);
+
+ if (gamma_lut) {
+ for (i = 0; i < lut_size; i++)
+ intel_de_write(dev_priv, PLANE_POST_CSC_GAMC_DATA(pipe, plane, 0),
+ gamma_lut[i].green & 0xffff);
+ /* Program the max register to clamp values > 1.0. */
+ while (i < 35)
+ intel_de_write(dev_priv, PLANE_POST_CSC_GAMC_DATA(pipe, plane, 0),
+ gamma_lut[i++].green & 0x3ffff);
+ } else {
+ for (i = 0; i < lut_size; i++) {
+ u32 v = (i * ((1 << 16) - 1)) / (lut_size - 1);
+
+ intel_de_write(dev_priv, PLANE_POST_CSC_GAMC_DATA(pipe, plane, 0), v);
+ }
+
+ do {
+ intel_de_write(dev_priv, PLANE_POST_CSC_GAMC_DATA(pipe, plane, 0),
+ (1 << 16));
+ } while (i++ < 34);
+ }
+
+ intel_de_write(dev_priv, PLANE_POST_CSC_GAMC_INDEX(pipe, plane, 0), 0);
+ }
+}
+
static void d13_plane_load_luts(const struct drm_plane_state *plane_state)
{
const struct drm_property_blob *degamma_lut_blob =
plane_state->degamma_lut;
+ const struct drm_property_blob *gamma_lut_blob =
+ plane_state->gamma_lut;
struct drm_color_lut_ext *degamma_lut = NULL;
+ struct drm_color_lut_ext *gamma_lut = NULL;

if (degamma_lut_blob) {
degamma_lut = degamma_lut_blob->data;
d13_program_plane_degamma_lut(plane_state, degamma_lut, 0);
}
+
+ if (gamma_lut_blob) {
+ gamma_lut = gamma_lut_blob->data;
+ d13_program_plane_gamma_lut(plane_state, gamma_lut, 0);
+ }
}

void intel_color_load_plane_luts(const struct drm_plane_state *plane_state)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index fc4f8b430518..037b95153b86 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7230,10 +7230,11 @@ enum {
#define _PLANE_COLOR_CTL_3_A 0x703CC /* GLK+ */
#define PLANE_COLOR_PIPE_GAMMA_ENABLE (1 << 30) /* Pre-ICL */
#define PLANE_COLOR_YUV_RANGE_CORRECTION_DISABLE (1 << 28)
-#define PLANE_COLOR_PLANE_CSC_ENABLE (1 << 21) /* ICL+ */
-#define PLANE_COLOR_INPUT_CSC_ENABLE (1 << 20) /* ICL+ */
-#define PLANE_COLOR_PIPE_CSC_ENABLE (1 << 23) /* Pre-ICL */
-#define PLANE_PRE_CSC_GAMMA_ENABLE (1 << 14)
+#define PLANE_COLOR_PLANE_CSC_ENABLE (1 << 21) /* ICL+ */
+#define PLANE_COLOR_INPUT_CSC_ENABLE (1 << 20) /* ICL+ */
+#define PLANE_COLOR_PIPE_CSC_ENABLE (1 << 23) /* Pre-ICL */
+#define PLANE_POST_CSC_GAMMA_MULTI_SEGMENT_ENABLE (1 << 15)
+#define PLANE_PRE_CSC_GAMMA_ENABLE (1 << 14)
#define PLANE_COLOR_CSC_MODE_BYPASS (0 << 17)
#define PLANE_COLOR_CSC_MODE_YUV601_TO_RGB601 (1 << 17)
#define PLANE_COLOR_CSC_MODE_YUV709_TO_RGB709 (2 << 17)
--
2.26.2