[PATCH v2 13/29] drm/sun4i: Add basic support for DE3

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Display Engine 3 is an upgrade of DE2 with new features like support for
10 bit color formats and support for AFBC.

Most of DE2 code works with DE3, except some small details.

Implement basic support for DE3. Support for 10 bit colort formats and
AFBC, among others missing features, will be added later.

Signed-off-by: Jernej Skrabec <jernej.skrabec@xxxxxxxx>
---
 drivers/gpu/drm/sun4i/sun8i_csc.c       | 83 +++++++++++++++++++++++++
 drivers/gpu/drm/sun4i/sun8i_mixer.c     | 38 +++++++----
 drivers/gpu/drm/sun4i/sun8i_mixer.h     | 33 +++++++++-
 drivers/gpu/drm/sun4i/sun8i_ui_scaler.c | 10 ++-
 drivers/gpu/drm/sun4i/sun8i_ui_scaler.h |  1 +
 drivers/gpu/drm/sun4i/sun8i_vi_layer.c  |  8 +++
 drivers/gpu/drm/sun4i/sun8i_vi_layer.h  |  2 +
 drivers/gpu/drm/sun4i/sun8i_vi_scaler.c | 19 +++++-
 drivers/gpu/drm/sun4i/sun8i_vi_scaler.h | 23 +++++++
 9 files changed, 201 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun8i_csc.c b/drivers/gpu/drm/sun4i/sun8i_csc.c
index 755b60bae408..e0e8bf263792 100644
--- a/drivers/gpu/drm/sun4i/sun8i_csc.c
+++ b/drivers/gpu/drm/sun4i/sun8i_csc.c
@@ -34,6 +34,41 @@ static const u32 yvu2rgb[] = {
 	0x000004A8, 0x00000000, 0x00000813, 0xFFFBAC4A,
 };
 
+/*
+ * DE3 has a bit different CSC units. Factors are in two's complement format.
+ * First three factors in a row are multiplication factors which have 17 bits
+ * for fractional part. Fourth value in a row is comprised of two factors.
+ * Upper 16 bits represents difference, which is subtracted from the input
+ * value before multiplication and lower 16 bits represents constant, which
+ * is addes at the end.
+ *
+ * x' = c00 * (x + d0) + c01 * (y + d1) + c02 * (z + d2) + const0
+ * y' = c10 * (x + d0) + c11 * (y + d1) + c12 * (z + d2) + const1
+ * z' = c20 * (x + d0) + c21 * (y + d1) + c22 * (z + d2) + const2
+ *
+ * Please note that above formula is true only for Blender CSC. Other DE3 CSC
+ * units takes only positive value for difference. From what can be deducted
+ * from BSP driver code, those units probably automatically assume that
+ * difference has to be subtracted.
+ *
+ * Layout of factors in table:
+ * c00 c01 c02 [d0 const0]
+ * c10 c11 c12 [d1 const1]
+ * c20 c21 c22 [d2 const2]
+ */
+
+static const u32 yuv2rgb_de3[] = {
+	0x0002542a, 0x00000000, 0x0003312a, 0xffc00000,
+	0x0002542a, 0xffff376b, 0xfffe5fc3, 0xfe000000,
+	0x0002542a, 0x000408d3, 0x00000000, 0xfe000000,
+};
+
+static const u32 yvu2rgb_de3[] = {
+	0x0002542a, 0x0003312a, 0x00000000, 0xffc00000,
+	0x0002542a, 0xfffe5fc3, 0xffff376b, 0xfe000000,
+	0x0002542a, 0x00000000, 0x000408d3, 0xfe000000,
+};
+
 static void sun8i_csc_set_coefficients(struct regmap *map, u32 base,
 				       enum sun8i_csc_mode mode)
 {
@@ -61,6 +96,28 @@ static void sun8i_csc_set_coefficients(struct regmap *map, u32 base,
 	}
 }
 
+static void sun8i_de3_ccsc_set_coefficients(struct regmap *map, int layer,
+					    enum sun8i_csc_mode mode)
+{
+	const u32 *table;
+	u32 base_reg;
+
+	switch (mode) {
+	case SUN8I_CSC_MODE_YUV2RGB:
+		table = yuv2rgb_de3;
+		break;
+	case SUN8I_CSC_MODE_YVU2RGB:
+		table = yvu2rgb_de3;
+		break;
+	default:
+		DRM_WARN("Wrong CSC mode specified.\n");
+		return;
+	}
+
+	base_reg = DE3_MIXER_BLEND_CSC_COEFF(DE3_BLD_BASE, layer, 0, 0);
+	regmap_bulk_write(map, base_reg, table, 12);
+}
+
 static void sun8i_csc_enable(struct regmap *map, u32 base, bool enable)
 {
 	u32 val;
@@ -73,11 +130,32 @@ static void sun8i_csc_enable(struct regmap *map, u32 base, bool enable)
 	regmap_update_bits(map, DE2_CSC_CTRL(base), DE2_CSC_CTRL_EN, val);
 }
 
+static void sun8i_de3_ccsc_enable(struct regmap *map, int layer, bool enable)
+{
+	u32 val, mask;
+
+	mask = DE3_MIXER_BLEND_CSC_CTL_EN(layer);
+
+	if (enable)
+		val = mask;
+	else
+		val = 0;
+
+	regmap_update_bits(map, DE3_MIXER_BLEND_CSC_CTL(DE3_BLD_BASE),
+			   mask, val);
+}
+
 void sun8i_csc_set_ccsc_coefficients(struct sun8i_mixer *mixer, int layer,
 				     enum sun8i_csc_mode mode)
 {
 	u32 base;
 
+	if (mixer->cfg->is_de3) {
+		sun8i_de3_ccsc_set_coefficients(mixer->engine.regs,
+						layer, mode);
+		return;
+	}
+
 	base = ccsc_base[mixer->cfg->ccsc][layer];
 
 	sun8i_csc_set_coefficients(mixer->engine.regs, base, mode);
@@ -87,6 +165,11 @@ void sun8i_csc_enable_ccsc(struct sun8i_mixer *mixer, int layer, bool enable)
 {
 	u32 base;
 
+	if (mixer->cfg->is_de3) {
+		sun8i_de3_ccsc_enable(mixer->engine.regs, layer, enable);
+		return;
+	}
+
 	base = ccsc_base[mixer->cfg->ccsc][layer];
 
 	sun8i_csc_enable(mixer->engine.regs, base, enable);
diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c b/drivers/gpu/drm/sun4i/sun8i_mixer.c
index 2cb24d987005..64daeb017d10 100644
--- a/drivers/gpu/drm/sun4i/sun8i_mixer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c
@@ -459,17 +459,33 @@ static int sun8i_mixer_bind(struct device *dev, struct device *master,
 
 	base = sun8i_blender_base(mixer);
 
-	/* Reset the registers */
-	for (i = 0; i < DE2_MIXER_UNIT_SIZE; i += 4)
-		regmap_write(mixer->engine.regs, i, 0);
-	/* Disable unused sub-engines */
-	regmap_write(mixer->engine.regs, DE2_MIXER_FCE_EN, 0);
-	regmap_write(mixer->engine.regs, DE2_MIXER_BWS_EN, 0);
-	regmap_write(mixer->engine.regs, DE2_MIXER_LTI_EN, 0);
-	regmap_write(mixer->engine.regs, DE2_MIXER_PEAK_EN, 0);
-	regmap_write(mixer->engine.regs, DE2_MIXER_ASE_EN, 0);
-	regmap_write(mixer->engine.regs, DE2_MIXER_FCC_EN, 0);
-	regmap_write(mixer->engine.regs, DE2_MIXER_DCSC_EN, 0);
+	/* Reset registers and disable unused sub-engines */
+	if (mixer->cfg->is_de3) {
+		for (i = 0; i < DE3_MIXER_UNIT_SIZE; i += 4)
+			regmap_write(mixer->engine.regs, i, 0);
+
+		regmap_write(mixer->engine.regs, DE3_MIXER_FCE_EN, 0);
+		regmap_write(mixer->engine.regs, DE3_MIXER_PEAK_EN, 0);
+		regmap_write(mixer->engine.regs, DE3_MIXER_LCTI_EN, 0);
+		regmap_write(mixer->engine.regs, DE3_MIXER_BLS_EN, 0);
+		regmap_write(mixer->engine.regs, DE3_MIXER_FCC_EN, 0);
+		regmap_write(mixer->engine.regs, DE3_MIXER_DNS_EN, 0);
+		regmap_write(mixer->engine.regs, DE3_MIXER_DRC_EN, 0);
+		regmap_write(mixer->engine.regs, DE3_MIXER_FMT_EN, 0);
+		regmap_write(mixer->engine.regs, DE3_MIXER_CDC0_EN, 0);
+		regmap_write(mixer->engine.regs, DE3_MIXER_CDC1_EN, 0);
+	} else {
+		for (i = 0; i < DE2_MIXER_UNIT_SIZE; i += 4)
+			regmap_write(mixer->engine.regs, i, 0);
+
+		regmap_write(mixer->engine.regs, DE2_MIXER_FCE_EN, 0);
+		regmap_write(mixer->engine.regs, DE2_MIXER_BWS_EN, 0);
+		regmap_write(mixer->engine.regs, DE2_MIXER_LTI_EN, 0);
+		regmap_write(mixer->engine.regs, DE2_MIXER_PEAK_EN, 0);
+		regmap_write(mixer->engine.regs, DE2_MIXER_ASE_EN, 0);
+		regmap_write(mixer->engine.regs, DE2_MIXER_FCC_EN, 0);
+		regmap_write(mixer->engine.regs, DE2_MIXER_DCSC_EN, 0);
+	}
 
 	/* Enable the mixer */
 	regmap_write(mixer->engine.regs, DE2_MIXER_GLOBAL_CTL,
diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.h b/drivers/gpu/drm/sun4i/sun8i_mixer.h
index f26ee6af6cba..4dcc85f0a53e 100644
--- a/drivers/gpu/drm/sun4i/sun8i_mixer.h
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.h
@@ -30,11 +30,16 @@
 #define DE2_MIXER_GLOBAL_DBUFF_ENABLE		BIT(0)
 
 #define DE2_MIXER_UNIT_SIZE			0x6000
+#define DE3_MIXER_UNIT_SIZE			0x3000
 
 #define DE2_BLD_BASE				0x1000
 #define DE2_CH_BASE				0x2000
 #define DE2_CH_SIZE				0x1000
 
+#define DE3_BLD_BASE				0x0800
+#define DE3_CH_BASE				0x1000
+#define DE3_CH_SIZE				0x0800
+
 #define DE2_MIXER_BLEND_PIPE_CTL(base)		((base) + 0)
 #define DE2_MIXER_BLEND_ATTR_FCOLOR(base, x)	((base) + 0x4 + 0x10 * (x))
 #define DE2_MIXER_BLEND_ATTR_INSIZE(base, x)	((base) + 0x8 + 0x10 * (x))
@@ -49,6 +54,11 @@
 #define DE2_MIXER_BLEND_CK_MAX(base, x)		((base) + 0xc0 + 0x04 * (x))
 #define DE2_MIXER_BLEND_CK_MIN(base, x)		((base) + 0xe0 + 0x04 * (x))
 #define DE2_MIXER_BLEND_OUTCTL(base)		((base) + 0xfc)
+#define DE3_MIXER_BLEND_CSC_CTL(base)		((base) + 0x100)
+#define DE3_MIXER_BLEND_CSC_COEFF(base, layer, x, y) \
+	((base) + 0x110 + (layer) * 0x30 +  (x) * 0x10 + 4 * (y))
+#define DE3_MIXER_BLEND_CSC_CONST(base, layer, i) \
+	((base) + 0x110 + (layer) * 0x30 +  (i) * 0x10 + 0x0c)
 
 #define DE2_MIXER_BLEND_PIPE_CTL_EN_MSK		GENMASK(12, 8)
 #define DE2_MIXER_BLEND_PIPE_CTL_EN(pipe)	BIT(8 + pipe)
@@ -63,6 +73,9 @@
 
 #define DE2_MIXER_BLEND_OUTCTL_INTERLACED	BIT(1)
 
+#define DE3_MIXER_BLEND_CSC_CTL_EN(ch)		BIT(ch)
+#define DE3_MIXER_BLEND_CSC_CONST_VAL(d, c)	(((d) << 16) | ((c) & 0xffff))
+
 #define DE2_MIXER_FBFMT_ARGB8888	0
 #define DE2_MIXER_FBFMT_ABGR8888	1
 #define DE2_MIXER_FBFMT_RGBA8888	2
@@ -112,6 +125,17 @@
 #define DE2_MIXER_FCC_EN			0xaa000
 #define DE2_MIXER_DCSC_EN			0xb0000
 
+#define DE3_MIXER_FCE_EN			0x70000
+#define DE3_MIXER_PEAK_EN			0x70800
+#define DE3_MIXER_LCTI_EN			0x71000
+#define DE3_MIXER_BLS_EN			0x71800
+#define DE3_MIXER_FCC_EN			0x72000
+#define DE3_MIXER_DNS_EN			0x80000
+#define DE3_MIXER_DRC_EN			0xa0000
+#define DE3_MIXER_FMT_EN			0xa8000
+#define DE3_MIXER_CDC0_EN			0xd0000
+#define DE3_MIXER_CDC1_EN			0xd8000
+
 struct de2_fmt_info {
 	u32			drm_fmt;
 	u32			de2_fmt;
@@ -133,6 +157,7 @@ struct de2_fmt_info {
  *	are invalid.
  * @mod_rate: module clock rate that needs to be set in order to have
  *	a functional block.
+ * @is_de3: true, if this is next gen display engine 3.0, false otherwise.
  */
 struct sun8i_mixer_cfg {
 	int		vi_num;
@@ -140,6 +165,7 @@ struct sun8i_mixer_cfg {
 	int		scaler_mask;
 	int		ccsc;
 	unsigned long	mod_rate;
+	bool		is_de3;
 };
 
 struct sun8i_mixer {
@@ -162,13 +188,16 @@ engine_to_sun8i_mixer(struct sunxi_engine *engine)
 static inline u32
 sun8i_blender_base(struct sun8i_mixer *mixer)
 {
-	return DE2_BLD_BASE;
+	return mixer->cfg->is_de3 ? DE3_BLD_BASE : DE2_BLD_BASE;
 }
 
 static inline u32
 sun8i_channel_base(struct sun8i_mixer *mixer, int channel)
 {
-	return DE2_CH_BASE + channel * DE2_CH_SIZE;
+	if (mixer->cfg->is_de3)
+		return DE3_CH_BASE + channel * DE3_CH_SIZE;
+	else
+		return DE2_CH_BASE + channel * DE2_CH_SIZE;
 }
 
 const struct de2_fmt_info *sun8i_mixer_format_info(u32 format);
diff --git a/drivers/gpu/drm/sun4i/sun8i_ui_scaler.c b/drivers/gpu/drm/sun4i/sun8i_ui_scaler.c
index 59dfe2deae8f..680b4ee08ab0 100644
--- a/drivers/gpu/drm/sun4i/sun8i_ui_scaler.c
+++ b/drivers/gpu/drm/sun4i/sun8i_ui_scaler.c
@@ -93,8 +93,14 @@ static u32 sun8i_ui_scaler_base(struct sun8i_mixer *mixer, int channel)
 {
 	int vi_num = mixer->cfg->vi_num;
 
-	return DE2_VI_SCALER_UNIT_BASE + DE2_VI_SCALER_UNIT_SIZE * vi_num +
-	       DE2_UI_SCALER_UNIT_SIZE * (channel - vi_num);
+	if (mixer->cfg->is_de3)
+		return DE3_VI_SCALER_UNIT_BASE +
+		       DE3_VI_SCALER_UNIT_SIZE * vi_num +
+		       DE3_UI_SCALER_UNIT_SIZE * (channel - vi_num);
+	else
+		return DE2_VI_SCALER_UNIT_BASE +
+		       DE2_VI_SCALER_UNIT_SIZE * vi_num +
+		       DE2_UI_SCALER_UNIT_SIZE * (channel - vi_num);
 }
 
 static int sun8i_ui_scaler_coef_index(unsigned int step)
diff --git a/drivers/gpu/drm/sun4i/sun8i_ui_scaler.h b/drivers/gpu/drm/sun4i/sun8i_ui_scaler.h
index 8db18053e6ee..427241ff1f47 100644
--- a/drivers/gpu/drm/sun4i/sun8i_ui_scaler.h
+++ b/drivers/gpu/drm/sun4i/sun8i_ui_scaler.h
@@ -12,6 +12,7 @@
 #include "sun8i_mixer.h"
 
 #define DE2_UI_SCALER_UNIT_SIZE 0x10000
+#define DE3_UI_SCALER_UNIT_SIZE 0x08000
 
 /* this two macros assumes 16 fractional bits which is standard in DRM */
 #define DE2_UI_SCALER_SCALE_MIN			1
diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
index 8ea07f34ad5b..7b7ac8bdf75f 100644
--- a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
@@ -202,6 +202,14 @@ static int sun8i_vi_layer_update_formats(struct sun8i_mixer *mixer, int channel,
 			   DE2_MIXER_CHAN_VI_LAYER_ATTR(ch_base, overlay),
 			   DE2_MIXER_CHAN_VI_LAYER_ATTR_RGB_MODE, val);
 
+	/* It seems that YUV formats use global alpha setting. */
+	if (mixer->cfg->is_de3)
+		regmap_update_bits(mixer->engine.regs,
+				   DE2_MIXER_CHAN_VI_LAYER_ATTR(ch_base,
+								overlay),
+				   DE3_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MASK,
+				   DE3_MIXER_CHAN_VI_LAYER_ATTR_ALPHA(0xff));
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_layer.h b/drivers/gpu/drm/sun4i/sun8i_vi_layer.h
index dfda659e309c..eb3988a153f9 100644
--- a/drivers/gpu/drm/sun4i/sun8i_vi_layer.h
+++ b/drivers/gpu/drm/sun4i/sun8i_vi_layer.h
@@ -30,6 +30,8 @@
 #define DE2_MIXER_CHAN_VI_LAYER_ATTR_RGB_MODE		BIT(15)
 #define DE2_MIXER_CHAN_VI_LAYER_ATTR_FBFMT_OFFSET	8
 #define DE2_MIXER_CHAN_VI_LAYER_ATTR_FBFMT_MASK		GENMASK(12, 8)
+#define DE3_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MASK	GENMASK(31, 24)
+#define DE3_MIXER_CHAN_VI_LAYER_ATTR_ALPHA(x)		((x) << 24)
 
 struct sun8i_mixer;
 
diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_scaler.c b/drivers/gpu/drm/sun4i/sun8i_vi_scaler.c
index b69ebca221c3..b1953569cccb 100644
--- a/drivers/gpu/drm/sun4i/sun8i_vi_scaler.c
+++ b/drivers/gpu/drm/sun4i/sun8i_vi_scaler.c
@@ -835,7 +835,12 @@ static const u32 bicubic4coefftab32[480] = {
 
 static u32 sun8i_vi_scaler_base(struct sun8i_mixer *mixer, int channel)
 {
-	return DE2_VI_SCALER_UNIT_BASE + DE2_VI_SCALER_UNIT_SIZE * channel;
+	if (mixer->cfg->is_de3)
+		return DE3_VI_SCALER_UNIT_BASE +
+		       DE3_VI_SCALER_UNIT_SIZE * channel;
+	else
+		return DE2_VI_SCALER_UNIT_BASE +
+		       DE2_VI_SCALER_UNIT_SIZE * channel;
 }
 
 static int sun8i_vi_scaler_coef_index(unsigned int step)
@@ -950,6 +955,18 @@ void sun8i_vi_scaler_setup(struct sun8i_mixer *mixer, int layer,
 		cvphase = vphase;
 	}
 
+	if (mixer->cfg->is_de3) {
+		u32 val;
+
+		if (format->hsub == 1 && format->vsub == 1)
+			val = DE3_SCALER_VSU_SCALE_MODE_UI;
+		else
+			val = DE3_SCALER_VSU_SCALE_MODE_NORMAL;
+
+		regmap_write(mixer->engine.regs,
+			     DE3_SCALER_VSU_SCALE_MODE(base), val);
+	}
+
 	regmap_write(mixer->engine.regs,
 		     DE2_SCALER_VSU_OUTSIZE(base), outsize);
 	regmap_write(mixer->engine.regs,
diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_scaler.h b/drivers/gpu/drm/sun4i/sun8i_vi_scaler.h
index b3168cae59b8..a9cf4b1ce642 100644
--- a/drivers/gpu/drm/sun4i/sun8i_vi_scaler.h
+++ b/drivers/gpu/drm/sun4i/sun8i_vi_scaler.h
@@ -15,6 +15,9 @@
 #define DE2_VI_SCALER_UNIT_BASE 0x20000
 #define DE2_VI_SCALER_UNIT_SIZE 0x20000
 
+#define DE3_VI_SCALER_UNIT_BASE 0x20000
+#define DE3_VI_SCALER_UNIT_SIZE 0x08000
+
 /* this two macros assumes 16 fractional bits which is standard in DRM */
 #define DE2_VI_SCALER_SCALE_MIN			1
 #define DE2_VI_SCALER_SCALE_MAX			((1UL << 20) - 1)
@@ -25,6 +28,11 @@
 #define DE2_VI_SCALER_SIZE(w, h)		(((h) - 1) << 16 | ((w) - 1))
 
 #define DE2_SCALER_VSU_CTRL(base)		((base) + 0x0)
+#define DE3_SCALER_VSU_SCALE_MODE(base)		((base) + 0x10)
+#define DE3_SCALER_VSU_DIR_THR(base)		((base) + 0x20)
+#define DE3_SCALER_VSU_EDGE_THR(base)		((base) + 0x24)
+#define DE3_SCALER_VSU_EDSCL_CTRL(base)		((base) + 0x28)
+#define DE3_SCALER_VSU_ANGLE_THR(base)		((base) + 0x2c)
 #define DE2_SCALER_VSU_OUTSIZE(base)		((base) + 0x40)
 #define DE2_SCALER_VSU_YINSIZE(base)		((base) + 0x80)
 #define DE2_SCALER_VSU_YHSTEP(base)		((base) + 0x88)
@@ -46,6 +54,21 @@
 #define DE2_SCALER_VSU_CTRL_EN			BIT(0)
 #define DE2_SCALER_VSU_CTRL_COEFF_RDY		BIT(4)
 
+#define DE3_SCALER_VSU_SUB_ZERO_DIR_THR(x)	(((x) << 24) & 0xFF)
+#define DE3_SCALER_VSU_ZERO_DIR_THR(x)		(((x) << 16) & 0xFF)
+#define DE3_SCALER_VSU_HORZ_DIR_THR(x)		(((x) << 8) & 0xFF)
+#define DE3_SCALER_VSU_VERT_DIR_THR(x)		((x) & 0xFF)
+
+#define DE3_SCALER_VSU_SCALE_MODE_UI		0
+#define DE3_SCALER_VSU_SCALE_MODE_NORMAL	1
+#define DE3_SCALER_VSU_SCALE_MODE_ED_SCALE	2
+
+#define DE3_SCALER_VSU_EDGE_SHIFT(x)		(((x) << 16) & 0xF)
+#define DE3_SCALER_VSU_EDGE_OFFSET(x)		((x) & 0xFF)
+
+#define DE3_SCALER_VSU_ANGLE_SHIFT(x)		(((x) << 16) & 0xF)
+#define DE3_SCALER_VSU_ANGLE_OFFSET(x)		((x) & 0xFF)
+
 void sun8i_vi_scaler_enable(struct sun8i_mixer *mixer, int layer, bool enable);
 void sun8i_vi_scaler_setup(struct sun8i_mixer *mixer, int layer,
 			   u32 src_w, u32 src_h, u32 dst_w, u32 dst_h,
-- 
2.19.0




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