[PATCH xf86-video-amdgpu 01/13] Add color management properties to driver-private CRTC object

[sunpeng.li at amd.com]

From: "Leo (Sunpeng) Li" <sunpeng.li at amd.com>

Non-legacy color management consists of 3 properties on the CRTC:
Degamma LUT, Color Transformation Matrix (CTM), and Gamma LUT.

Add these properties to the driver-private CRTC, and initialize them
when the CRTC is initialized. These values are refered to as "staged"
values. They exist in the DDX driver, but require a "push" to DRM in
order to be realized in hardware.

Also add a destructor for the driver-private CRTC, which cleans up the
non-legacy properties.

Signed-off-by: Leo (Sunpeng) Li <sunpeng.li at amd.com>
---
 src/drmmode_display.c | 107 +++++++++++++++++++++++++++++++++++++++++++++++++-
 src/drmmode_display.h |   8 ++++
 2 files changed, 114 insertions(+), 1 deletion(-)

diff --git a/src/drmmode_display.c b/src/drmmode_display.c
index 49284c6..0ffc6ad 100644
--- a/src/drmmode_display.c
+++ b/src/drmmode_display.c
@@ -747,6 +747,83 @@ drmmode_crtc_scanout_update(xf86CrtcPtr crtc, DisplayModePtr mode,
 	}
 }
 
+enum drmmode_cm_prop {
+	CM_GAMMA_LUT_SIZE,
+	CM_DEGAMMA_LUT_SIZE,
+	CM_GAMMA_LUT,
+	CM_CTM,
+	CM_DEGAMMA_LUT,
+	CM_NUM_PROPS,
+	CM_INVALID_PROP = -1,
+};
+
+char *CM_PROP_NAMES[] = {
+	"GAMMA_LUT_SIZE",
+	"DEGAMMA_LUT_SIZE",
+	"GAMMA_LUT",
+	"CTM",
+	"DEGAMMA_LUT",
+};
+
+/**
+ * Return the enum of the color management property with the given name.
+ */
+static enum drmmode_cm_prop get_cm_enum_from_str(const char *prop_name)
+{
+	enum drmmode_cm_prop ret;
+
+	for (ret = 0; ret < CM_NUM_PROPS; ret++) {
+		if (!strcmp(prop_name, CM_PROP_NAMES[ret]))
+			return ret;
+	}
+	return CM_INVALID_PROP;
+}
+
+/**
+ * Query DRM for the property value of the specified color management property,
+ * on the specified CRTC.
+ *
+ * @crtc: The CRTC to query DRM properties on.
+ * @prop_id: Color management property enum.
+ * Return: The property value (if property is DRM blob, return blob_id) of the
+ *         specified color property. 0 if property not found.
+ */
+static uint64_t get_drm_cm_prop_value(xf86CrtcPtr crtc,
+				      enum drmmode_cm_prop prop_id)
+{
+	AMDGPUEntPtr pAMDGPUEnt = AMDGPUEntPriv(crtc->scrn);
+	drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;
+	drmModeObjectPropertiesPtr drm_props;
+	int i;
+
+	/* Get list of DRM CRTC properties, and their values */
+	drm_props = drmModeObjectGetProperties(pAMDGPUEnt->fd,
+					       drmmode_crtc->mode_crtc->crtc_id,
+					       DRM_MODE_OBJECT_CRTC);
+	if (!drm_props)
+		goto err_allocs;
+
+	for (i = 0; i < drm_props->count_props; i++) {
+		drmModePropertyPtr drm_prop;
+
+		drm_prop = drmModeGetProperty(pAMDGPUEnt->fd,
+					      drm_props->props[i]);
+		if (!drm_prop)
+			goto err_allocs;
+
+		if (get_cm_enum_from_str(drm_prop->name) == prop_id){
+			drmModeFreeProperty(drm_prop);
+			return drm_props->prop_values[i];
+		}
+
+		drmModeFreeProperty(drm_prop);
+	}
+
+err_allocs:
+	drmModeFreeObjectProperties(drm_props);
+	return 0;
+}
+
 static void
 drmmode_crtc_gamma_do_set(xf86CrtcPtr crtc, uint16_t *red, uint16_t *green,
 			  uint16_t *blue, int size)
@@ -1293,6 +1370,22 @@ static Bool drmmode_set_scanout_pixmap(xf86CrtcPtr crtc, PixmapPtr ppix)
 	return TRUE;
 }
 
+static void drmmode_crtc_destroy(xf86CrtcPtr crtc)
+{
+	drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;
+
+	drmModeFreeCrtc(drmmode_crtc->mode_crtc);
+
+	/* Free LUTs and CTM */
+	free(drmmode_crtc->gamma_lut);
+	free(drmmode_crtc->degamma_lut);
+	free(drmmode_crtc->ctm);
+
+	free(drmmode_crtc);
+	crtc->driver_private = NULL;
+}
+
+
 static xf86CrtcFuncsRec drmmode_crtc_funcs = {
 	.dpms = drmmode_crtc_dpms,
 	.set_mode_major = drmmode_set_mode_major,
@@ -1309,7 +1402,7 @@ static xf86CrtcFuncsRec drmmode_crtc_funcs = {
 	.shadow_create = drmmode_crtc_shadow_create,
 	.shadow_allocate = drmmode_crtc_shadow_allocate,
 	.shadow_destroy = drmmode_crtc_shadow_destroy,
-	.destroy = NULL,	/* XXX */
+	.destroy = drmmode_crtc_destroy,
 	.set_scanout_pixmap = drmmode_set_scanout_pixmap,
 };
 
@@ -1353,6 +1446,18 @@ drmmode_crtc_init(ScrnInfoPtr pScrn, drmmode_ptr drmmode, drmModeResPtr mode_res
 	crtc->driver_private = drmmode_crtc;
 	drmmode_crtc_hw_id(crtc);
 
+	drmmode_crtc->gamma_lut_size =
+		(uint32_t)get_drm_cm_prop_value(crtc, CM_GAMMA_LUT_SIZE);
+	drmmode_crtc->degamma_lut_size =
+		(uint32_t)get_drm_cm_prop_value(crtc, CM_DEGAMMA_LUT_SIZE);
+	drmmode_crtc->ctm = calloc(1, sizeof(*drmmode_crtc->ctm));
+	if (drmmode_crtc->ctm == NULL)
+		return 0;
+
+	/* Init to identity matrix. Values are in S31.32 fixed-point format */
+	drmmode_crtc->ctm->matrix[0] = drmmode_crtc->ctm->matrix[4] =
+		drmmode_crtc->ctm->matrix[8] = (uint64_t)1 << 32;
+
 	/* Mark num'th crtc as in use on this device. */
 	pAMDGPUEnt->assigned_crtcs |= (1 << num);
 	xf86DrvMsgVerb(pScrn->scrnIndex, X_INFO, AMDGPU_LOGLEVEL_DEBUG,
diff --git a/src/drmmode_display.h b/src/drmmode_display.h
index 25ae9f8..21498e3 100644
--- a/src/drmmode_display.h
+++ b/src/drmmode_display.h
@@ -109,6 +109,14 @@ typedef struct {
 	unsigned present_vblank_msc;
 	Bool present_flip_expected;
 #endif
+
+	uint32_t gamma_lut_size;
+	struct drm_color_lut *gamma_lut;
+
+	uint32_t degamma_lut_size;
+	struct drm_color_lut *degamma_lut;
+
+	struct drm_color_ctm *ctm;
 } drmmode_crtc_private_rec, *drmmode_crtc_private_ptr;
 
 typedef struct {
-- 
2.7.4