[PATCH v8 10/14] drm/i915/iet: Add support to writing the IET LUT data

[Arun R Murthy <arun.r.murthy@intel.com>]

User created LUT can be fed back to the hardware so that the hardware
can apply this LUT data to see the enhancement in the image.

Signed-off-by: Arun R Murthy <arun.r.murthy@intel.com>
---
 drivers/gpu/drm/i915/display/intel_histogram.c | 70 ++++++++++++++++++++++++++
 drivers/gpu/drm/i915/display/intel_histogram.h |  4 ++
 2 files changed, 74 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_histogram.c b/drivers/gpu/drm/i915/display/intel_histogram.c
index 4f3dcbabfe96e955a65874718272c4beb53b0827..aa02e7ce42b930a858de4ad7e0d39d93fa7d4298 100644
--- a/drivers/gpu/drm/i915/display/intel_histogram.c
+++ b/drivers/gpu/drm/i915/display/intel_histogram.c
@@ -20,6 +20,7 @@
 /* Precision factor for threshold guardband */
 #define HISTOGRAM_GUARDBAND_PRECISION_FACTOR 10000
 #define HISTOGRAM_BIN_READ_RETRY_COUNT 5
+#define IET_SAMPLE_FORMAT_1_INT_9_FRACT 0x1000009
 
 static bool intel_histogram_get_data(struct intel_crtc *intel_crtc)
 {
@@ -223,6 +224,60 @@ int intel_histogram_update(struct intel_crtc *intel_crtc,
 	return 0;
 }
 
+int intel_histogram_set_iet_lut(struct intel_crtc *intel_crtc,
+				struct drm_property_blob *blob)
+{
+	struct intel_histogram *histogram = intel_crtc->histogram;
+	struct intel_display *display = to_intel_display(intel_crtc);
+	int pipe = intel_crtc->pipe;
+	int i = 0;
+	struct drm_iet_1dlut_sample *iet;
+	u32 *data;
+	int ret;
+
+	if (!histogram)
+		return -EINVAL;
+
+	if (!histogram->enable) {
+		drm_err(display->drm, "histogram not enabled");
+		return -EINVAL;
+	}
+
+	if (!data) {
+	drm_err(display->drm, "enhancement LUT data is NULL");
+		return -EINVAL;
+	}
+
+	/* Set DPST_CTL Bin Reg function select to IE & wait for a vblabk */
+	intel_de_rmw(display, DPST_CTL(pipe),
+		     DPST_CTL_BIN_REG_FUNC_SEL, DPST_CTL_BIN_REG_FUNC_IE);
+
+	drm_crtc_wait_one_vblank(&intel_crtc->base);
+
+	 /* Set DPST_CTL Bin Register Index to 0 */
+	intel_de_rmw(display, DPST_CTL(pipe),
+		     DPST_CTL_BIN_REG_MASK, DPST_CTL_BIN_REG_CLEAR);
+
+	iet = (struct drm_iet_1dlut_sample *)blob->data;
+	data = kzalloc(sizeof(data) * iet->nr_elements, GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+	ret = copy_from_user(data, (uint32_t __user *)(unsigned long)iet->iet_lut,
+			     sizeof(uint32_t) * iet->nr_elements);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < HISTOGRAM_IET_LENGTH; i++) {
+		intel_de_rmw(display, DPST_BIN(pipe),
+			     DPST_BIN_DATA_MASK, data[i]);
+		drm_dbg_atomic(display->drm, "iet_lut[%d]=%x\n", i, data[i]);
+	}
+	kfree(data);
+	drm_property_blob_put(intel_crtc->base.state->iet_lut);
+
+	return 0;
+}
+
 void intel_histogram_finish(struct intel_crtc *intel_crtc)
 {
 	struct intel_histogram *histogram = intel_crtc->histogram;
@@ -235,6 +290,8 @@ int intel_histogram_init(struct intel_crtc *crtc)
 {
 	struct intel_histogram *histogram;
 	struct drm_histogram_caps *histogram_caps;
+	struct drm_iet_caps *iet_caps;
+	u32 *iet_format;
 
 	/* Allocate histogram internal struct */
 	histogram = kzalloc(sizeof(*histogram), GFP_KERNEL);
@@ -247,10 +304,23 @@ int intel_histogram_init(struct intel_crtc *crtc)
 	histogram_caps->histogram_mode = DRM_MODE_HISTOGRAM_HSV_MAX_RGB;
 	histogram_caps->bins_count = HISTOGRAM_BIN_COUNT;
 
+	iet_caps = kzalloc(sizeof(*iet_caps), GFP_KERNEL);
+	if (!iet_caps)
+		return -ENOMEM;
+
+	iet_caps->iet_mode = DRM_MODE_IET_MULTIPLICATIVE;
+	iet_caps->nr_iet_sample_formats = 1;
+	iet_caps->nr_iet_lut_entries = HISTOGRAM_IET_LENGTH;
+	iet_format = kzalloc(sizeof(u32)*iet_caps->nr_iet_sample_formats,
+			     GFP_KERNEL);
+	*iet_format = IET_SAMPLE_FORMAT_1_INT_9_FRACT;
+	iet_caps->iet_sample_format = *iet_format;
+
 	crtc->histogram = histogram;
 	histogram->crtc = crtc;
 	histogram->can_enable = false;
 	histogram->caps = histogram_caps;
+	histogram->iet_caps = iet_caps;
 
 	INIT_DEFERRABLE_WORK(&histogram->work,
 			     intel_histogram_handle_int_work);
diff --git a/drivers/gpu/drm/i915/display/intel_histogram.h b/drivers/gpu/drm/i915/display/intel_histogram.h
index b44ba3afc94f79f291f4e5ebdd04dcf9434b48a4..0999d1720c7abee8907c77896e4b1e6ff756160f 100644
--- a/drivers/gpu/drm/i915/display/intel_histogram.h
+++ b/drivers/gpu/drm/i915/display/intel_histogram.h
@@ -18,9 +18,11 @@ struct intel_display;
 enum pipe;
 
 #define HISTOGRAM_BIN_COUNT                    32
+#define HISTOGRAM_IET_LENGTH                   33
 
 struct intel_histogram {
 	struct drm_histogram_caps *caps;
+	struct drm_iet_caps *iet_caps;
 	struct intel_crtc *crtc;
 	struct delayed_work work;
 	bool enable;
@@ -45,6 +47,8 @@ void intel_histogram_irq_handler(struct intel_display *display, enum pipe pipe);
 int intel_histogram_atomic_check(struct intel_crtc *intel_crtc);
 int intel_histogram_update(struct intel_crtc *intel_crtc,
 			   struct drm_histogram_config *config);
+int intel_histogram_set_iet_lut(struct intel_crtc *intel_crtc,
+				struct drm_property_blob *blob);
 int intel_histogram_init(struct intel_crtc *intel_crtc);
 void intel_histogram_finish(struct intel_crtc *intel_crtc);
 

-- 
2.25.1