[PATCH xf86-video-intel 2/2] sna: Support 10bpc gamma via the GAMMA_LUT crtc property

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From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>

Probe the GAMMA_LUT/GAMMA_LUT_SIZE props and utilize them when
the running with > 8bpc.

Cc: Mario Kleiner <mario.kleiner.de@xxxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
 src/sna/sna_display.c | 247 +++++++++++++++++++++++++++++++++++-------
 1 file changed, 208 insertions(+), 39 deletions(-)

diff --git a/src/sna/sna_display.c b/src/sna/sna_display.c
index 916cc3c04e07..2f82e1fa3d86 100644
--- a/src/sna/sna_display.c
+++ b/src/sna/sna_display.c
@@ -127,6 +127,7 @@ struct local_mode_obj_get_properties {
 	uint32_t obj_type;
 	uint32_t pad;
 };
+#define LOCAL_MODE_OBJECT_CRTC 0xcccccccc
 #define LOCAL_MODE_OBJECT_PLANE 0xeeeeeeee
 
 struct local_mode_set_plane {
@@ -229,6 +230,11 @@ struct sna_crtc {
 	} primary;
 	struct list sprites;
 
+	struct drm_color_lut *gamma_lut;
+	uint64_t gamma_lut_prop;
+	uint64_t gamma_lut_blob;
+	uint32_t gamma_lut_size;
+
 	uint32_t mode_serial, flip_serial;
 
 	uint32_t last_seq, wrap_seq;
@@ -317,6 +323,9 @@ static void __sna_output_dpms(xf86OutputPtr output, int dpms, int fixup);
 static void sna_crtc_disable_cursor(struct sna *sna, struct sna_crtc *crtc);
 static bool sna_crtc_flip(struct sna *sna, struct sna_crtc *crtc,
 			  struct kgem_bo *bo, int x, int y);
+static void sna_crtc_gamma_set(xf86CrtcPtr crtc,
+			       CARD16 *red, CARD16 *green,
+			       CARD16 *blue, int size);
 
 static bool is_zaphod(ScrnInfoPtr scrn)
 {
@@ -3150,11 +3159,9 @@ sna_crtc_set_mode_major(xf86CrtcPtr crtc, DisplayModePtr mode,
 	       mode->VDisplay <= sna->mode.max_crtc_height);
 
 #if HAS_GAMMA
-	drmModeCrtcSetGamma(sna->kgem.fd, __sna_crtc_id(sna_crtc),
-			    crtc->gamma_size,
-			    crtc->gamma_red,
-			    crtc->gamma_green,
-			    crtc->gamma_blue);
+	sna_crtc_gamma_set(crtc,
+			   crtc->gamma_red, crtc->gamma_green,
+			   crtc->gamma_blue, crtc->gamma_size);
 #endif
 
 	saved_kmode = sna_crtc->kmode;
@@ -3212,12 +3219,44 @@ void sna_mode_adjust_frame(struct sna *sna, int x, int y)
 
 static void
 sna_crtc_gamma_set(xf86CrtcPtr crtc,
-		       CARD16 *red, CARD16 *green, CARD16 *blue, int size)
+		   CARD16 *red, CARD16 *green, CARD16 *blue, int size)
 {
-	assert(to_sna_crtc(crtc));
-	drmModeCrtcSetGamma(to_sna(crtc->scrn)->kgem.fd,
-			    sna_crtc_id(crtc),
-			    size, red, green, blue);
+	struct sna *sna = to_sna(crtc->scrn);
+	struct sna_crtc *sna_crtc = to_sna_crtc(crtc);
+	struct drm_color_lut *lut = sna_crtc->gamma_lut;
+	uint32_t blob_size = size * sizeof(lut[0]);
+	uint32_t blob_id;
+	int ret, i;
+
+	DBG(("%s: gamma_size %d\n", __FUNCTION__, size));
+
+	if (!lut) {
+		assert(size == 256);
+
+		drmModeCrtcSetGamma(to_sna(crtc->scrn)->kgem.fd,
+				    sna_crtc_id(crtc),
+				    size, red, green, blue);
+		return;
+	}
+
+	assert(size == sna_crtc->gamma_lut_size);
+
+	for (i = 0; i < size; i++) {
+		lut[i].red = red[i];
+		lut[i].green = green[i];
+		lut[i].blue = blue[i];
+	}
+
+	ret = drmModeCreatePropertyBlob(sna->kgem.fd, lut, blob_size, &blob_id);
+	if (ret)
+		return;
+
+	ret = drmModeObjectSetProperty(sna->kgem.fd,
+				       sna_crtc->id, DRM_MODE_OBJECT_CRTC,
+				       sna_crtc->gamma_lut_prop,
+				       blob_id);
+
+	drmModeDestroyPropertyBlob(sna->kgem.fd, blob_id);
 }
 
 static void
@@ -3229,6 +3268,8 @@ sna_crtc_destroy(xf86CrtcPtr crtc)
 	if (sna_crtc == NULL)
 		return;
 
+	free(sna_crtc->gamma_lut);
+
 	list_for_each_entry_safe(sprite, sn, &sna_crtc->sprites, link)
 		free(sprite);
 
@@ -3663,6 +3704,55 @@ bool sna_has_sprite_format(struct sna *sna, uint32_t format)
 	return false;
 }
 
+inline static bool prop_is_gamma_lut(const struct drm_mode_get_property *prop)
+{
+	return prop_has_type_and_name(prop, 4, "GAMMA_LUT");
+}
+
+inline static bool prop_is_gamma_lut_size(const struct drm_mode_get_property *prop)
+{
+	return prop_has_type_and_name(prop, 1, "GAMMA_LUT_SIZE");
+}
+
+static void sna_crtc_parse_prop(struct sna *sna,
+				struct drm_mode_get_property *prop,
+				uint64_t value, void *data)
+{
+	struct sna_crtc *crtc = data;
+
+	if (prop_is_gamma_lut(prop)) {
+		crtc->gamma_lut_prop = prop->prop_id;
+		crtc->gamma_lut_blob = value;
+	} else if (prop_is_gamma_lut_size(prop)) {
+		crtc->gamma_lut_size = value;
+	}
+}
+
+static void
+sna_crtc_init__props(struct sna *sna, struct sna_crtc *crtc)
+{
+	ScrnInfoPtr scrn = sna->scrn;
+
+	parse_props(sna, LOCAL_MODE_OBJECT_CRTC, crtc->id,
+		    sna_crtc_parse_prop, crtc);
+
+	/* use high precision gamma LUT for > 8bpc */
+	/* X-Server < 1.20 mishandles > 256 slots / > 8 bpc color maps. */
+	if (scrn->rgbBits <= 8 ||
+	    XORG_VERSION_CURRENT < XORG_VERSION_NUMERIC(1,20,0,0,0))
+		crtc->gamma_lut_size = 0;
+
+	if (crtc->gamma_lut_size) {
+		crtc->gamma_lut = calloc(max(crtc->gamma_lut_size, 256),
+					 sizeof(crtc->gamma_lut[0]));
+		if (!crtc->gamma_lut)
+			crtc->gamma_lut_size = 0;
+	}
+
+	DBG(("%s: CRTC:%d, gamma_lut_size=%d\n", __FUNCTION__,
+	     sna_crtc_id(crtc), crtc->gamma_lut_size));
+}
+
 static void
 sna_crtc_init__rotation(struct sna *sna, struct sna_crtc *crtc)
 {
@@ -3723,6 +3813,9 @@ sna_crtc_add(ScrnInfoPtr scrn, unsigned id)
 
 	list_init(&sna_crtc->sprites);
 	sna_crtc_init__rotation(sna, sna_crtc);
+
+	sna_crtc_init__props(sna, sna_crtc);
+
 	sna_crtc_find_planes(sna, sna_crtc);
 
 	DBG(("%s: CRTC:%d [pipe=%d], primary id=%x: supported-rotations=%x, current-rotation=%x\n",
@@ -7282,36 +7375,110 @@ static void output_set_gamma(xf86OutputPtr output, xf86CrtcPtr crtc)
 			  mon->mon_gamma_blue);
 }
 
+static bool
+crtc_get_gamma_lut(xf86CrtcPtr crtc,
+		   CARD16 *red, CARD16 *green, CARD16 *blue, int size)
+{
+
+	struct sna *sna = to_sna(crtc->scrn);
+	struct sna_crtc *sna_crtc = to_sna_crtc(crtc);
+	struct drm_color_lut *lut = sna_crtc->gamma_lut;
+	struct drm_mode_get_blob blob;
+	int lut_size, i;
+
+	DBG(("%s: gamma_size %d\n", __FUNCTION__, size));
+
+	memset(&blob, 0, sizeof(blob));
+	blob.blob_id = sna_crtc->gamma_lut_blob;
+
+	if (drmIoctl(sna->kgem.fd, DRM_IOCTL_MODE_GETPROPBLOB, &blob))
+		return false;
+
+	lut_size = blob.length / sizeof(lut[0]);
+
+	if (lut_size == 0 ||
+	    lut_size > max(sna_crtc->gamma_lut_size, 256))
+		return false;
+
+	blob.data = (uintptr_t)lut;
+
+	if (drmIoctl(sna->kgem.fd, DRM_IOCTL_MODE_GETPROPBLOB, &blob))
+		return false;
+
+	for (i = 0; i < size; i++) {
+		struct drm_color_lut *entry =
+			&lut[i * (lut_size - 1) / (size - 1)];
+
+		red[i] = entry->red;
+		green[i] = entry->green;
+		blue[i] = entry->blue;
+	}
+
+	return red[size - 1] &&
+		green[size - 1] &&
+		blue[size - 1];
+}
+
+static bool crtc_get_gamma_legacy(xf86CrtcPtr crtc,
+				  CARD16 *red,
+				  CARD16 *green,
+				  CARD16 *blue,
+				  int size)
+{
+	struct sna *sna = to_sna(crtc->scrn);
+	struct sna_crtc *sna_crtc = to_sna_crtc(crtc);
+	struct drm_mode_crtc_lut lut = {
+		.crtc_id = __sna_crtc_id(sna_crtc),
+		.gamma_size = size,
+		.red = (uintptr_t)red,
+		.green = (uintptr_t)green,
+		.blue = (uintptr_t)blue,
+	};
+
+	if (drmIoctl(sna->kgem.fd, DRM_IOCTL_MODE_GETGAMMA, &lut) != 0)
+		return false;
+
+	VG(VALGRIND_MAKE_MEM_DEFINED(red, size*sizeof(red[0])));
+	VG(VALGRIND_MAKE_MEM_DEFINED(green, size*sizeof(green[0])));
+	VG(VALGRIND_MAKE_MEM_DEFINED(bluered, size*sizeof(blue[0])));
+
+	return red[size - 1] &&
+		green[size - 1] &&
+		blue[size - 1];
+}
+
 static void crtc_init_gamma(xf86CrtcPtr crtc)
 {
+	struct sna *sna = to_sna(crtc->scrn);
+	struct sna_crtc *sna_crtc = to_sna_crtc(crtc);
 	uint16_t *gamma;
+	int size;
+
+	assert(sna_crtc);
+
+	size = sna_crtc->gamma_lut_size;
+	if (!size)
+		size = 256;
 
 	/* Initialize the gamma ramps */
 	gamma = NULL;
-	if (crtc->gamma_size == 256)
+	if (crtc->gamma_size == size)
 		gamma = crtc->gamma_red;
 	if (gamma == NULL)
-		gamma = malloc(3 * 256 * sizeof(uint16_t));
+		gamma = malloc(3 * size * sizeof(uint16_t));
 	if (gamma) {
-		struct sna *sna = to_sna(crtc->scrn);
-		struct sna_crtc *sna_crtc = to_sna_crtc(crtc);
 		struct drm_mode_crtc_lut lut;
-		bool gamma_set = false;
-
-		assert(sna_crtc);
-
-		lut.crtc_id = __sna_crtc_id(sna_crtc);
-		lut.gamma_size = 256;
-		lut.red = (uintptr_t)(gamma);
-		lut.green = (uintptr_t)(gamma + 256);
-		lut.blue = (uintptr_t)(gamma + 2 * 256);
-		if (drmIoctl(sna->kgem.fd, DRM_IOCTL_MODE_GETGAMMA, &lut) == 0) {
-			VG(VALGRIND_MAKE_MEM_DEFINED(gamma, 3*256*sizeof(gamma[0])));
-			gamma_set =
-				gamma[256 - 1] &&
-				gamma[2*256 - 1] &&
-				gamma[3*256 - 1];
-		}
+		bool gamma_set;
+		uint16_t *red = gamma;
+		uint16_t *green = gamma + size;
+		uint16_t *blue = gamma + 2 * size;
+
+		if (sna_crtc->gamma_lut_size)
+			gamma_set = crtc_get_gamma_lut(crtc, red,
+						       green, blue, size);
+		else
+			gamma_set = crtc_get_gamma_legacy(crtc, red,
+							  green, blue, size);
 
 		DBG(("%s: CRTC:%d, pipe=%d: gamma set?=%d\n",
 		     __FUNCTION__, __sna_crtc_id(sna_crtc), __sna_crtc_pipe(sna_crtc),
@@ -7319,19 +7486,21 @@ static void crtc_init_gamma(xf86CrtcPtr crtc)
 		if (!gamma_set) {
 			int i;
 
-			for (i = 0; i < 256; i++) {
-				gamma[i] = i << 8;
-				gamma[256 + i] = i << 8;
-				gamma[2*256 + i] = i << 8;
+			for (i = 0; i < size; i++) {
+				uint16_t val = i * 0xffff / (size - 1);
+
+				red[i] = val;
+				green[i] = val;
+				blue[i] = val;
 			}
 		}
 
-		if (gamma != crtc->gamma_red) {
+		if (red != crtc->gamma_red) {
 			free(crtc->gamma_red);
-			crtc->gamma_red = gamma;
-			crtc->gamma_green = gamma + 256;
-			crtc->gamma_blue = gamma + 2*256;
-			crtc->gamma_size = 256;
+			crtc->gamma_red = red;
+			crtc->gamma_green = green;
+			crtc->gamma_blue = blue;
+			crtc->gamma_size = size;
 		}
 	}
 }
-- 
2.19.2

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