[Intel-gfx] [RFC v2 09/22] drm/i915/xelpd: Program Plane Degamma Registers

Uma Shankar
2021-09-06T21:01:50Z

Extract the LUT and program plane degamma registers.

Signed-off-by: Uma Shankar <uma.shankar@intel.com>
---
drivers/gpu/drm/i915/display/intel_color.c | 116 +++++++++++++++++++++
drivers/gpu/drm/i915/i915_reg.h | 2 +
2 files changed, 118 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
index fd0bfdf85703..62df5122309a 100644
--- a/drivers/gpu/drm/i915/display/intel_color.c
+++ b/drivers/gpu/drm/i915/display/intel_color.c
@@ -126,6 +126,29 @@ static bool crtc_state_is_legacy_gamma(const struct intel_crtc_state *crtc_state
lut_is_legacy(crtc_state->hw.gamma_lut);
}

+/*
+ * Added to accommodate enhanced LUT precision.
+ * Max LUT precision is 32 bits.
+ */
+static u64 drm_color_lut_extract_ext(u64 user_input, u32 bit_precision)
+{
+ u64 val = user_input & 0xffffffff;
+ u32 max;
+
+ if (bit_precision > 32)
+ return 0;
+
+ max = 0xffffffff >> (32 - bit_precision);
+ /* Round only if we're not using full precision. */
+ if (bit_precision < 32) {
+ val += 1UL << (32 - bit_precision - 1);
+ val >>= 32 - bit_precision;
+ }
+
+ return ((user_input & 0xffffffff00000000) |
+ clamp_val(val, 0, max));
+}
+
/*
* When using limited range, multiply the matrix given by userspace by
* the matrix that we would use for the limited range.
@@ -2196,6 +2219,97 @@ static const struct drm_color_lut_range d13_degamma_sdr[] = {
},
};

+static void d13_program_plane_degamma_lut(const struct drm_plane_state *state,
+ struct drm_color_lut_ext *degamma_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)) {
+ lut_size = 128;
+
+ intel_de_write(dev_priv, PLANE_PRE_CSC_GAMC_INDEX_ENH(pipe, plane, 0),
+ PLANE_PAL_PREC_AUTO_INCREMENT);
+
+ if (degamma_lut) {
+ for (i = 0; i < lut_size; i++) {
+ u64 word = drm_color_lut_extract_ext(degamma_lut[i].green, 24);
+ u32 lut_val = (word & 0xffffff);
+
+ intel_de_write(dev_priv, PLANE_PRE_CSC_GAMC_DATA_ENH(pipe, plane, 0),
+ lut_val);
+ }
+
+ /* Program the max register to clamp values > 1.0. */
+ while (i < 131)
+ intel_de_write(dev_priv, PLANE_PRE_CSC_GAMC_DATA_ENH(pipe, plane, 0),
+ degamma_lut[i++].green);
+ } else {
+ for (i = 0; i < lut_size; i++) {
+ u32 v = (i * ((1 << 24) - 1)) / (lut_size - 1);
+
+ intel_de_write(dev_priv, PLANE_PRE_CSC_GAMC_DATA_ENH(pipe, plane, 0), v);
+ }
+
+ do {
+ intel_de_write(dev_priv, PLANE_PRE_CSC_GAMC_DATA_ENH(pipe, plane, 0),
+ 1 << 24);
+ } while (i++ < 130);
+ }
+
+ intel_de_write(dev_priv, PLANE_PRE_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_PRE_CSC_GAMC_INDEX(pipe, plane, 0),
+ PLANE_PAL_PREC_AUTO_INCREMENT);
+
+ if (degamma_lut) {
+ for (i = 0; i < lut_size; i++)
+ intel_de_write(dev_priv, PLANE_PRE_CSC_GAMC_DATA(pipe, plane, 0),
+ degamma_lut[i].green);
+ /* Program the max register to clamp values > 1.0. */
+ while (i < 35)
+ intel_de_write(dev_priv, PLANE_PRE_CSC_GAMC_DATA(pipe, plane, 0),
+ degamma_lut[i++].green);
+ } else {
+ for (i = 0; i < lut_size; i++) {
+ u32 v = (i * ((1 << 16) - 1)) / (lut_size - 1);
+
+ intel_de_write(dev_priv, PLANE_PRE_CSC_GAMC_DATA(pipe, plane, 0), v);
+ }
+
+ do {
+ intel_de_write(dev_priv, PLANE_PRE_CSC_GAMC_DATA(pipe, plane, 0),
+ 1 << 16);
+ } while (i++ < 34);
+ }
+
+ intel_de_write(dev_priv, PLANE_PRE_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;
+ struct drm_color_lut_ext *degamma_lut = NULL;
+
+ if (degamma_lut_blob) {
+ degamma_lut = degamma_lut_blob->data;
+ d13_program_plane_degamma_lut(plane_state, degamma_lut, 0);
+ }
+}
+
int intel_plane_color_init(struct drm_plane *plane)
{
struct drm_i915_private *dev_priv = to_i915(plane->dev);
@@ -2217,6 +2331,8 @@ int intel_plane_color_init(struct drm_plane *plane)
d13_degamma_sdr,
sizeof(d13_degamma_sdr),
LUT_TYPE_DEGAMMA);
+
+ dev_priv->display.load_plane_luts = d13_plane_load_luts;
drm_plane_attach_degamma_properties(plane);
}

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 919982c878ac..0c36a330734f 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7232,6 +7232,7 @@ enum {
#define PLANE_COLOR_YUV_RANGE_CORRECTION_DISABLE (1 << 28)
#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_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)
@@ -11381,6 +11382,7 @@ enum skl_power_gate {
#define PLANE_PRE_CSC_GAMC_INDEX_ENH(pipe, plane, i) \
_MMIO_PLANE_GAMC(plane, i, _PLANE_PRE_CSC_GAMC_INDEX_ENH_1(pipe), \
_PLANE_PRE_CSC_GAMC_INDEX_ENH_2(pipe))
+#define PLANE_PAL_PREC_AUTO_INCREMENT (1 << 10)

#define _PLANE_PRE_CSC_GAMC_DATA_ENH_1_A 0x701d4
#define _PLANE_PRE_CSC_GAMC_DATA_ENH_1_B 0x711d4
--
2.26.2