[v9][PATCH 10/11] drm/i915/display: Extract icl_read_luts()

From: Swati Sharma <swati2.sharma@intel.com>
To: intel-gfx@lists.freedesktop.org
Cc: jani.nikula@intel.com, daniel.vetter@ffwll.ch,
	ankit.k.nautiyal@intel.com
Subject: [v9][PATCH 10/11] drm/i915/display: Extract icl_read_luts()
Date: Fri, 30 Aug 2019 14:01:52 +0530	[thread overview]
Message-ID: <1567153913-20166-11-git-send-email-swati2.sharma@intel.com> (raw)
In-Reply-To: <1567153913-20166-1-git-send-email-swati2.sharma@intel.com>

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

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

v4: -No need to initialize *blob [Jani]
    -Removed right shifts [Jani]
    -Dropped dev local var [Jani]
v5: -Returned blob instead of assigning it internally within the
     function [Ville]
    -Renamed icl_get_color_config() to icl_read_luts() [Ville]
    -Renamed bdw_get_gamma_config() to bdw_read_lut_10() [Ville]
v9: -Added hw lut creation for multi-seg gamma mode

Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
---
 drivers/gpu/drm/i915/display/intel_color.c | 88 +++++++++++++++++++++++++++---
 drivers/gpu/drm/i915/i915_reg.h            |  6 ++
 2 files changed, 86 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_color.c b/drivers/gpu/drm/i915/display/intel_color.c
index 621f540..8d6f3c4 100644
--- a/drivers/gpu/drm/i915/display/intel_color.c
+++ b/drivers/gpu/drm/i915/display/intel_color.c
@@ -837,7 +837,6 @@ static u32 ilk_lut_12p4_ldw(const struct drm_color_lut *color)
 	u32 i;
 
 	/*
-	 *
 	 * Program Fine segment (let's call it seg2)...
 	 *
 	 * Fine segment's step is 1/(128 * 256) ie 1/(128 * 256),  2/(128*256)
@@ -890,12 +889,10 @@ static void icl_load_luts(const struct intel_crtc_state *crtc_state)
 	case GAMMA_MODE_MODE_8BIT:
 		i9xx_load_luts(crtc_state);
 		break;
-
 	case GAMMA_MODE_MODE_12BIT_MULTI_SEGMENTED:
 		icl_program_gamma_superfine_segment(crtc_state);
 		icl_program_gamma_multi_segment(crtc_state);
 		break;
-
 	default:
 		bdw_load_lut_10(crtc, gamma_lut, PAL_PREC_INDEX_VALUE(0));
 		ivb_load_lut_ext_max(crtc);
@@ -1798,6 +1795,80 @@ 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_super_multi_seg(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 hw_lut_size = 521;
+	enum pipe pipe = crtc->pipe;
+	struct drm_property_blob *blob;
+	struct drm_color_lut *blob_data;
+	u32 i, val1, val2;
+
+	I915_WRITE(PREC_PAL_MULTI_SEG_INDEX(pipe), PAL_PREC_AUTO_INCREMENT);
+
+	blob = drm_property_create_blob(&dev_priv->drm,
+					sizeof(struct drm_color_lut) * hw_lut_size,
+					NULL);
+	if (IS_ERR(blob))
+		return NULL;
+
+	blob_data = blob->data;
+
+	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_LDW_MASK, val1) << 10 |
+				   REG_FIELD_GET(PAL_PREC_MULTI_SEG_RED_UDW_MASK, val2);
+		blob_data[i].green = REG_FIELD_GET(PAL_PREC_MULTI_SEG_GREEN_LDW_MASK, val1) << 10 |
+				     REG_FIELD_GET(PAL_PREC_MULTI_SEG_GREEN_UDW_MASK, val2);
+		blob_data[i].blue = REG_FIELD_GET(PAL_PREC_MULTI_SEG_BLUE_LDW_MASK, val1) << 10 |
+				    REG_FIELD_GET(PAL_PREC_MULTI_SEG_BLUE_UDW_MASK, val2);
+	}
+
+	I915_WRITE(PREC_PAL_INDEX(pipe), PAL_PREC_AUTO_INCREMENT);
+
+	for (i = 1; i < 257; i++) {
+		val1 = I915_READ(PREC_PAL_DATA(pipe));
+		val2 = I915_READ(PREC_PAL_DATA(pipe));
+
+		blob_data[i + 8].red = REG_FIELD_GET(PAL_PREC_MULTI_SEG_RED_LDW_MASK, val1) << 10 |
+				       REG_FIELD_GET(PAL_PREC_MULTI_SEG_RED_UDW_MASK, val2);
+		blob_data[i + 8].green = REG_FIELD_GET(PAL_PREC_MULTI_SEG_GREEN_LDW_MASK, val1) << 10 |
+					 REG_FIELD_GET(PAL_PREC_MULTI_SEG_GREEN_UDW_MASK, val2);
+		blob_data[i + 8].blue = REG_FIELD_GET(PAL_PREC_MULTI_SEG_BLUE_LDW_MASK, val1) << 10 |
+					REG_FIELD_GET(PAL_PREC_MULTI_SEG_BLUE_UDW_MASK, val2);
+	}
+
+	for (i = 0; i < 256; i++) {
+		val1 = I915_READ(PREC_PAL_DATA(pipe));
+		val2 = I915_READ(PREC_PAL_DATA(pipe));
+
+		blob_data[i + 265].red = REG_FIELD_GET(PAL_PREC_MULTI_SEG_RED_LDW_MASK, val1) << 10 |
+					 REG_FIELD_GET(PAL_PREC_MULTI_SEG_RED_UDW_MASK, val2);
+		blob_data[i + 265].green = REG_FIELD_GET(PAL_PREC_MULTI_SEG_GREEN_LDW_MASK, val1) << 10 |
+					   REG_FIELD_GET(PAL_PREC_MULTI_SEG_GREEN_UDW_MASK, val2);
+		blob_data[i + 265].blue = REG_FIELD_GET(PAL_PREC_MULTI_SEG_BLUE_LDW_MASK, val1) << 10 |
+					  REG_FIELD_GET(PAL_PREC_MULTI_SEG_BLUE_UDW_MASK, val2);
+	}
+
+	return blob;
+}
+
+static void icl_read_luts(struct intel_crtc_state *crtc_state)
+{
+	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_super_multi_seg(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);
@@ -1839,16 +1910,17 @@ void intel_color_init(struct intel_crtc *crtc)
 		else
 			dev_priv->display.color_commit = ilk_color_commit;
 
-		if (INTEL_GEN(dev_priv) >= 11)
+		if (INTEL_GEN(dev_priv) >= 11) {
 			dev_priv->display.load_luts = icl_load_luts;
-		else if (IS_CANNONLAKE(dev_priv) || IS_GEMINILAKE(dev_priv)) {
+			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;
-		} else if (INTEL_GEN(dev_priv) >= 8)
+		} else if (INTEL_GEN(dev_priv) >= 8) {
 			dev_priv->display.load_luts = bdw_load_luts;
-		else if (INTEL_GEN(dev_priv) >= 7)
+		} else if (INTEL_GEN(dev_priv) >= 7) {
 			dev_priv->display.load_luts = ivb_load_luts;
-		else {
+		} else {
 			dev_priv->display.load_luts = ilk_load_luts;
 			dev_priv->display.read_luts = ilk_read_luts;
 		}
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 6b8bbfd..553b71d 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -10297,6 +10297,12 @@ 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, \
-- 
1.9.1

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