[PATCH 3/4] [v5] drm/i915/color: Extract icl_read_luts()

Swati Sharma
2019-10-04T08:35:31Z

For icl+, have hw read out to create hw blob of gamma
lut values. icl+ platforms supports multi segmented gamma
mode by default, add hw lut creation for this mode.

This will be used to validate gamma programming using dsb
(display state buffer) which is a tgl specific feature.

Major change done-removal of readouts of coarse and fine segments
because PAL_PREC_DATA register isn't giving propoer values.
State checker limited only to "fine segment"

v2: -readout code for multisegmented gamma has to come
up with some intermediate entries that aren't preserved
in hardware (Jani N)
-linear interpolation (Ville)
-moved common code to check gamma_enable to specific funcs,
since icl doesn't support that
v3: -use u16 instead of __u16 [Jani N]
-used single lut [Jani N]
-improved and more readable for loops [Jani N]
-read values directly to actual locations and then fill gaps [Jani N]
-moved cleaning to patch 1 [Jani N]
-renamed icl_read_lut_multi_seg() to icl_read_lut_multi_segment to
make it similar to icl_load_luts()
-renamed icl_compute_interpolated_gamma_blob() to
icl_compute_interpolated_gamma_lut_values() more sensible, I guess
v4: -removed interpolated func for creating gamma lut values
-removed readouts of fine and coarse segments, failure to read PAL_PREC_DATA
correctly
v5: -added gamma_enable check inside read_luts()

Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
---
drivers/gpu/drm/i915/display/intel_color.c | 114 ++++++++++++++++++---
drivers/gpu/drm/i915/i915_reg.h | 6 ++
2 files changed, 108 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
index 44ce75f051ad..168e9daae3de 100644
--- a/drivers/gpu/drm/i915/display/intel_color.c
+++ b/drivers/gpu/drm/i915/display/intel_color.c
@@ -1484,6 +1484,25 @@ static int glk_gamma_precision(const struct intel_crtc_state *crtc_state)
}
}

+static int icl_gamma_precision(const struct intel_crtc_state *crtc_state)
+{
+ if ((crtc_state->gamma_mode & POST_CSC_GAMMA_ENABLE) == 0)
+ return 0;
+
+ switch (crtc_state->gamma_mode & GAMMA_MODE_MODE_MASK) {
+ case GAMMA_MODE_MODE_8BIT:
+ return 8;
+ case GAMMA_MODE_MODE_10BIT:
+ return 10;
+ case GAMMA_MODE_MODE_12BIT_MULTI_SEGMENTED:
+ return 16;
+ default:
+ MISSING_CASE(crtc_state->gamma_mode);
+ return 0;
+ }
+
+}
+
int intel_color_get_gamma_bit_precision(const struct intel_crtc_state *crtc_state)
{
struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
@@ -1495,7 +1514,9 @@ int intel_color_get_gamma_bit_precision(const struct intel_crtc_state *crtc_stat
else
return i9xx_gamma_precision(crtc_state);
} else {
- if (IS_CANNONLAKE(dev_priv) || IS_GEMINILAKE(dev_priv))
+ if (INTEL_GEN(dev_priv) >= 11)
+ return icl_gamma_precision(crtc_state);
+ else if (IS_CANNONLAKE(dev_priv) || IS_GEMINILAKE(dev_priv))
return glk_gamma_precision(crtc_state);
else if (IS_IRONLAKE(dev_priv))
return ilk_gamma_precision(crtc_state);
@@ -1526,6 +1547,20 @@ static bool intel_color_lut_entry_equal(struct drm_color_lut *lut1,
return true;
}

+static bool intel_color_lut_entry_multi_equal(struct drm_color_lut *lut1,
+ struct drm_color_lut *lut2,
+ int lut_size, u32 err)
+{
+ int i;
+
+ for (i = 0; i < 9; i++) {
+ if (!err_check(&lut1[i], &lut2[i], err))
+ return false;
+ }
+
+ return true;
+}
+
bool intel_color_lut_equal(struct drm_property_blob *blob1,
struct drm_property_blob *blob2,
u32 gamma_mode, u32 bit_precision)
@@ -1544,16 +1579,8 @@ bool intel_color_lut_equal(struct drm_property_blob *blob1,
lut_size2 = drm_color_lut_size(blob2);

/* check sw and hw lut size */
- switch (gamma_mode) {
- case GAMMA_MODE_MODE_8BIT:
- case GAMMA_MODE_MODE_10BIT:
- if (lut_size1 != lut_size2)
- return false;
- break;
- default:
- MISSING_CASE(gamma_mode);
- return false;
- }
+ if (lut_size1 != lut_size2)
+ return false;

lut1 = blob1->data;
lut2 = blob2->data;
@@ -1561,13 +1588,18 @@ bool intel_color_lut_equal(struct drm_property_blob *blob1,
err = 0xffff >> bit_precision;

/* check sw and hw lut entry to be equal */
- switch (gamma_mode) {
+ switch (gamma_mode & GAMMA_MODE_MODE_MASK) {
case GAMMA_MODE_MODE_8BIT:
case GAMMA_MODE_MODE_10BIT:
if (!intel_color_lut_entry_equal(lut1, lut2,
lut_size2, err))
return false;
break;
+ case GAMMA_MODE_MODE_12BIT_MULTI_SEGMENTED:
+ if (!intel_color_lut_entry_multi_equal(lut1, lut2,
+ lut_size2, err))
+ return false;
+ break;
default:
MISSING_CASE(gamma_mode);
return false;
@@ -1828,6 +1860,63 @@ static void glk_read_luts(struct intel_crtc_state *crtc_state)
crtc_state->base.gamma_lut = glk_read_lut_10(crtc_state, PAL_PREC_INDEX_VALUE(0));
}

+static struct drm_property_blob *
+icl_read_lut_multi_segment(const struct intel_crtc_state *crtc_state)
+{
+ struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
+ struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
+ int lut_size = INTEL_INFO(dev_priv)->color.gamma_lut_size;
+ enum pipe pipe = crtc->pipe;
+ struct drm_property_blob *blob;
+ struct drm_color_lut *blob_data;
+ u32 i, val1, val2;
+
+ blob = drm_property_create_blob(&dev_priv->drm,
+ sizeof(struct drm_color_lut) * lut_size,
+ NULL);
+ if (IS_ERR(blob))
+ return NULL;
+
+ blob_data = blob->data;
+
+ I915_WRITE(PREC_PAL_MULTI_SEG_INDEX(pipe), PAL_PREC_AUTO_INCREMENT);
+
+ for (i = 0; i < 9; i++) {
+ val1 = I915_READ(PREC_PAL_MULTI_SEG_DATA(pipe));
+ val2 = I915_READ(PREC_PAL_MULTI_SEG_DATA(pipe));
+
+ blob_data[i].red = REG_FIELD_GET(PAL_PREC_MULTI_SEG_RED_UDW_MASK, val2) << 6 |
+ REG_FIELD_GET(PAL_PREC_MULTI_SEG_RED_LDW_MASK, val1);
+ blob_data[i].green = REG_FIELD_GET(PAL_PREC_MULTI_SEG_GREEN_UDW_MASK, val2) << 6 |
+ REG_FIELD_GET(PAL_PREC_MULTI_SEG_GREEN_LDW_MASK, val1);
+ blob_data[i].blue = REG_FIELD_GET(PAL_PREC_MULTI_SEG_BLUE_UDW_MASK, val2) << 6 |
+ REG_FIELD_GET(PAL_PREC_MULTI_SEG_BLUE_LDW_MASK, val1);
+ }
+
+ /*
+ * FIXME readouts from PAL_PREC_DATA register aren't giving correct values
+ * in the case of fine and coarse segments. Restricting readouts only for
+ * super fine segment as of now.
+ */
+
+ return blob;
+}
+
+static void icl_read_luts(struct intel_crtc_state *crtc_state)
+{
+ if ((crtc_state->gamma_mode & POST_CSC_GAMMA_ENABLE) == 0)
+ return;
+
+ if ((crtc_state->gamma_mode & GAMMA_MODE_MODE_MASK) ==
+ GAMMA_MODE_MODE_8BIT)
+ crtc_state->base.gamma_lut = i9xx_read_lut_8(crtc_state);
+ else if ((crtc_state->gamma_mode & GAMMA_MODE_MODE_MASK) ==
+ GAMMA_MODE_MODE_12BIT_MULTI_SEGMENTED)
+ crtc_state->base.gamma_lut = icl_read_lut_multi_segment(crtc_state);
+ else
+ crtc_state->base.gamma_lut = glk_read_lut_10(crtc_state, PAL_PREC_INDEX_VALUE(0));
+}
+
void intel_color_init(struct intel_crtc *crtc)
{
struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
@@ -1871,6 +1960,7 @@ void intel_color_init(struct intel_crtc *crtc)

if (INTEL_GEN(dev_priv) >= 11) {
dev_priv->display.load_luts = icl_load_luts;
+ dev_priv->display.read_luts = icl_read_luts;
} else if (IS_CANNONLAKE(dev_priv) || IS_GEMINILAKE(dev_priv)) {
dev_priv->display.load_luts = glk_load_luts;
dev_priv->display.read_luts = glk_read_luts;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 058aa5ca8b73..78766b378c0f 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -10571,6 +10571,12 @@ enum skl_power_gate {

#define _PAL_PREC_MULTI_SEG_DATA_A 0x4A40C
#define _PAL_PREC_MULTI_SEG_DATA_B 0x4AC0C
+#define PAL_PREC_MULTI_SEG_RED_LDW_MASK REG_GENMASK(29, 24)
+#define PAL_PREC_MULTI_SEG_RED_UDW_MASK REG_GENMASK(29, 20)
+#define PAL_PREC_MULTI_SEG_GREEN_LDW_MASK REG_GENMASK(19, 14)
+#define PAL_PREC_MULTI_SEG_GREEN_UDW_MASK REG_GENMASK(19, 10)
+#define PAL_PREC_MULTI_SEG_BLUE_LDW_MASK REG_GENMASK(9, 4)
+#define PAL_PREC_MULTI_SEG_BLUE_UDW_MASK REG_GENMASK(9, 0)

#define PREC_PAL_MULTI_SEG_INDEX(pipe) _MMIO_PIPE(pipe, \
_PAL_PREC_MULTI_SEG_INDEX_A, \
--
2.23.0