From: Maxime Ripard <maxime@cerno.tech>
To: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
Eric Anholt <eric@anholt.net>
Cc: dri-devel@lists.freedesktop.org,
linux-rpi-kernel@lists.infradead.org,
bcm-kernel-feedback-list@broadcom.com,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
Dave Stevenson <dave.stevenson@raspberrypi.com>,
Tim Gover <tim.gover@raspberrypi.com>,
Phil Elwell <phil@raspberrypi.com>,
Maxime Ripard <maxime@cerno.tech>
Subject: [PATCH 77/89] drm/vc4: hdmi: Add a CSC setup callback
Date: Mon, 24 Feb 2020 10:07:19 +0100 [thread overview]
Message-ID: <a73b3d00759a1a9a84ac485d111e2ddbe247d9ed.1582533919.git-series.maxime@cerno.tech> (raw)
In-Reply-To: <cover.6c896ace9a5a7840e9cec008b553cbb004ca1f91.1582533919.git-series.maxime@cerno.tech>
Similarly to the previous patches, the CSC setup is slightly different in
the BCM2711 than in the previous generations. Let's add a callback for it.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
drivers/gpu/drm/vc4/vc4_hdmi.c | 71 ++++++++++++++++++++---------------
drivers/gpu/drm/vc4/vc4_hdmi.h | 3 +-
2 files changed, 45 insertions(+), 29 deletions(-)
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 50d69c74c5c4..405019118a20 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -336,6 +336,41 @@ static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder)
DRM_ERROR("Failed to release power domain: %d\n", ret);
}
+static void vc4_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi, bool enable)
+{
+ u32 csc_ctl;
+
+ csc_ctl = VC4_SET_FIELD(VC4_HD_CSC_CTL_ORDER_BGR,
+ VC4_HD_CSC_CTL_ORDER);
+
+ if (enable) {
+ /* CEA VICs other than #1 requre limited range RGB
+ * output unless overridden by an AVI infoframe.
+ * Apply a colorspace conversion to squash 0-255 down
+ * to 16-235. The matrix here is:
+ *
+ * [ 0 0 0.8594 16]
+ * [ 0 0.8594 0 16]
+ * [ 0.8594 0 0 16]
+ * [ 0 0 0 1]
+ */
+ csc_ctl |= VC4_HD_CSC_CTL_ENABLE;
+ csc_ctl |= VC4_HD_CSC_CTL_RGB2YCC;
+ csc_ctl |= VC4_SET_FIELD(VC4_HD_CSC_CTL_MODE_CUSTOM,
+ VC4_HD_CSC_CTL_MODE);
+
+ HDMI_WRITE(HDMI_CSC_12_11, (0x000 << 16) | 0x000);
+ HDMI_WRITE(HDMI_CSC_14_13, (0x100 << 16) | 0x6e0);
+ HDMI_WRITE(HDMI_CSC_22_21, (0x6e0 << 16) | 0x000);
+ HDMI_WRITE(HDMI_CSC_24_23, (0x100 << 16) | 0x000);
+ HDMI_WRITE(HDMI_CSC_32_31, (0x000 << 16) | 0x6e0);
+ HDMI_WRITE(HDMI_CSC_34_33, (0x100 << 16) | 0x000);
+ }
+
+ /* The RGB order applies even when CSC is disabled. */
+ HDMI_WRITE(HDMI_CSC_CTL, csc_ctl);
+}
+
static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
{
struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
@@ -359,7 +394,6 @@ static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
mode->crtc_vsync_end -
interlaced,
VC4_HDMI_VERTB_VBP));
- u32 csc_ctl;
int ret;
ret = pm_runtime_get_sync(&vc4_hdmi->pdev->dev);
@@ -430,41 +464,19 @@ static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
(vsync_pos ? 0 : VC4_HD_VID_CTL_VSYNC_LOW) |
(hsync_pos ? 0 : VC4_HD_VID_CTL_HSYNC_LOW));
- csc_ctl = VC4_SET_FIELD(VC4_HD_CSC_CTL_ORDER_BGR,
- VC4_HD_CSC_CTL_ORDER);
-
if (vc4_encoder->hdmi_monitor &&
- drm_default_rgb_quant_range(mode) ==
- HDMI_QUANTIZATION_RANGE_LIMITED) {
- /* CEA VICs other than #1 requre limited range RGB
- * output unless overridden by an AVI infoframe.
- * Apply a colorspace conversion to squash 0-255 down
- * to 16-235. The matrix here is:
- *
- * [ 0 0 0.8594 16]
- * [ 0 0.8594 0 16]
- * [ 0.8594 0 0 16]
- * [ 0 0 0 1]
- */
- csc_ctl |= VC4_HD_CSC_CTL_ENABLE;
- csc_ctl |= VC4_HD_CSC_CTL_RGB2YCC;
- csc_ctl |= VC4_SET_FIELD(VC4_HD_CSC_CTL_MODE_CUSTOM,
- VC4_HD_CSC_CTL_MODE);
+ drm_default_rgb_quant_range(mode) == HDMI_QUANTIZATION_RANGE_LIMITED) {
+ if (vc4_hdmi->variant->csc_setup)
+ vc4_hdmi->variant->csc_setup(vc4_hdmi, true);
- HDMI_WRITE(HDMI_CSC_12_11, (0x000 << 16) | 0x000);
- HDMI_WRITE(HDMI_CSC_14_13, (0x100 << 16) | 0x6e0);
- HDMI_WRITE(HDMI_CSC_22_21, (0x6e0 << 16) | 0x000);
- HDMI_WRITE(HDMI_CSC_24_23, (0x100 << 16) | 0x000);
- HDMI_WRITE(HDMI_CSC_32_31, (0x000 << 16) | 0x6e0);
- HDMI_WRITE(HDMI_CSC_34_33, (0x100 << 16) | 0x000);
vc4_encoder->limited_rgb_range = true;
} else {
+ if (vc4_hdmi->variant->csc_setup)
+ vc4_hdmi->variant->csc_setup(vc4_hdmi, false);
+
vc4_encoder->limited_rgb_range = false;
}
- /* The RGB order applies even when CSC is disabled. */
- HDMI_WRITE(HDMI_CSC_CTL, csc_ctl);
-
HDMI_WRITE(HDMI_FIFO_CTL, VC4_HDMI_FIFO_CTL_MASTER_SLAVE_N);
if (debug_dump_regs) {
@@ -1411,6 +1423,7 @@ struct vc4_hdmi_variant bcm2835_variant = {
.num_registers = ARRAY_SIZE(vc4_hdmi_fields),
.init_resources = vc4_hdmi_init_resources,
+ .csc_setup = vc4_hdmi_csc_setup,
.reset = vc4_hdmi_reset,
.phy_init = vc4_hdmi_phy_init,
.phy_disable = vc4_hdmi_phy_disable,
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h
index 9ae4d2c5a4f0..22669e07b22e 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.h
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
@@ -41,6 +41,9 @@ struct vc4_hdmi_variant {
/* Callback to reset the HDMI block */
void (*reset)(struct vc4_hdmi *vc4_hdmi);
+ /* Callback to enable / disable the CSC */
+ void (*csc_setup)(struct vc4_hdmi *vc4_hdmi, bool enable);
+
/* Callback to initialize the PHY according to the mode */
void (*phy_init)(struct vc4_hdmi *vc4_hdmi,
struct drm_display_mode *mode);
--
git-series 0.9.1
next prev parent reply other threads:[~2020-02-24 9:10 UTC|newest]
Thread overview: 161+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-24 9:06 [PATCH 00/89] drm/vc4: Support BCM2711 Display Pipeline Maxime Ripard
2020-02-24 9:06 ` [PATCH 01/89] dt-bindings: i2c: brcmstb: Convert the BRCMSTB binding to a schema Maxime Ripard
2020-02-24 17:40 ` Florian Fainelli
2020-02-25 18:14 ` Rob Herring
2020-03-10 10:07 ` Wolfram Sang
2020-03-10 10:07 ` Wolfram Sang
2020-02-24 9:06 ` [PATCH 02/89] dt-bindings: i2c: brcmstb: Add BCM2711 BSC/AUTO-I2C binding Maxime Ripard
2020-02-24 17:48 ` Florian Fainelli
2020-02-25 18:15 ` Rob Herring
2020-03-10 10:07 ` Wolfram Sang
2020-02-24 9:06 ` [PATCH 03/89] i2c: brcmstb: Support BCM2711 HDMI BSC controllers Maxime Ripard
2020-02-24 17:44 ` Florian Fainelli
2020-03-10 10:12 ` Wolfram Sang
2020-02-24 9:06 ` [PATCH 04/89] i2c: brcmstb: Allow to compile it on BCM2835 Maxime Ripard
2020-02-24 17:39 ` Florian Fainelli
2020-03-10 10:16 ` Wolfram Sang
2020-02-24 9:06 ` [PATCH 05/89] clk: Return error code when of provider pointer is NULL Maxime Ripard
2020-03-12 23:13 ` Stephen Boyd
2020-02-24 9:06 ` [PATCH 06/89] dt-bindings: clock: Add a binding for the RPi Firmware clocks Maxime Ripard
2020-02-25 18:16 ` Rob Herring
2020-03-12 23:14 ` Stephen Boyd
2020-02-24 9:06 ` [PATCH 07/89] clk: bcm: rpi: Allow the driver to be probed by DT Maxime Ripard
2020-02-25 16:00 ` Nicolas Saenz Julienne
2020-02-26 15:01 ` Maxime Ripard
2020-02-28 19:57 ` Nicolas Saenz Julienne
2020-03-01 12:16 ` Stefan Wahren
2020-03-23 15:13 ` Maxime Ripard
2020-02-24 9:06 ` [PATCH 08/89] clk: bcm: rpi: Statically init clk_init_data Maxime Ripard
2020-02-25 16:05 ` Nicolas Saenz Julienne
2020-02-24 9:06 ` [PATCH 09/89] clk: bcm: rpi: Use clk_hw_register for pllb_arm Maxime Ripard
2020-02-25 16:11 ` Nicolas Saenz Julienne
2020-03-12 23:17 ` Stephen Boyd
2020-02-24 9:06 ` [PATCH 10/89] clk: bcm: rpi: Remove global pllb_arm clock pointer Maxime Ripard
2020-02-25 16:13 ` Nicolas Saenz Julienne
2020-02-26 14:26 ` Maxime Ripard
2020-02-26 14:57 ` Nicolas Saenz Julienne
2020-02-24 9:06 ` [PATCH 11/89] clk: bcm: rpi: Make sure pllb_arm is removed Maxime Ripard
2020-02-25 16:14 ` Nicolas Saenz Julienne
2020-03-12 23:20 ` Stephen Boyd
2020-02-24 9:06 ` [PATCH 12/89] clk: bcm: rpi: Remove pllb_arm_lookup global pointer Maxime Ripard
2020-02-25 16:16 ` Nicolas Saenz Julienne
2020-03-12 23:21 ` Stephen Boyd
2020-03-13 1:13 ` Stephen Boyd
2020-02-24 9:06 ` [PATCH 13/89] clk: bcm: rpi: Switch to clk_hw_register_clkdev Maxime Ripard
2020-02-25 16:17 ` Nicolas Saenz Julienne
2020-03-13 1:12 ` Stephen Boyd
2020-02-24 9:06 ` [PATCH 14/89] clk: bcm: rpi: Make sure the clkdev lookup is removed Maxime Ripard
2020-02-25 16:19 ` Nicolas Saenz Julienne
2020-03-13 1:11 ` Stephen Boyd
2020-02-24 9:06 ` [PATCH 15/89] clk: bcm: rpi: Create a data structure for the clocks Maxime Ripard
2020-02-25 16:24 ` Nicolas Saenz Julienne
2020-03-13 1:11 ` Stephen Boyd
2020-02-24 9:06 ` [PATCH 16/89] clk: bcm: rpi: Add clock id to data Maxime Ripard
2020-02-24 19:25 ` Stefan Wahren
2020-02-25 9:54 ` Maxime Ripard
2020-02-25 14:33 ` Nicolas Saenz Julienne
2020-02-25 16:24 ` Nicolas Saenz Julienne
2020-03-13 1:11 ` Stephen Boyd
2020-02-24 9:06 ` [PATCH 17/89] clk: bcm: rpi: Pass the clocks data to the firmware function Maxime Ripard
2020-02-25 16:26 ` Nicolas Saenz Julienne
2020-03-13 1:09 ` Stephen Boyd
2020-02-24 9:06 ` [PATCH 18/89] clk: bcm: rpi: Rename is_prepared function Maxime Ripard
2020-02-25 16:45 ` Nicolas Saenz Julienne
2020-03-13 1:09 ` Stephen Boyd
2020-02-24 9:06 ` [PATCH 19/89] clk: bcm: rpi: Split pllb clock hooks Maxime Ripard
2020-03-13 1:08 ` Stephen Boyd
2020-02-24 9:06 ` [PATCH 20/89] clk: bcm: rpi: Make the PLLB registration function return a clk_hw Maxime Ripard
2020-03-13 1:01 ` Stephen Boyd
2020-02-24 9:06 ` [PATCH 21/89] clk: bcm: rpi: Add DT provider for the clocks Maxime Ripard
2020-03-13 1:01 ` Stephen Boyd
2020-02-24 9:06 ` [PATCH 22/89] clk: bcm: rpi: Discover the firmware clocks Maxime Ripard
2020-02-24 16:47 ` kbuild test robot
2020-02-24 16:47 ` [PATCH] clk: bcm: rpi: fix noderef.cocci warnings kbuild test robot
2020-02-24 18:15 ` [PATCH 22/89] clk: bcm: rpi: Discover the firmware clocks Florian Fainelli
2020-02-26 14:15 ` Maxime Ripard
2020-02-24 20:24 ` kbuild test robot
2020-03-13 1:08 ` Stephen Boyd
2020-02-24 9:06 ` [PATCH 23/89] ARM: dts: bcm2711: Add firmware clocks node Maxime Ripard
2020-02-24 9:06 ` [PATCH 24/89] reset: Move reset-simple header out of drivers/reset Maxime Ripard
2020-02-24 9:06 ` [PATCH 25/89] reset: simple: Add reset callback Maxime Ripard
2020-03-04 12:03 ` Philipp Zabel
2020-02-24 9:06 ` [PATCH 26/89] dt-bindings: clock: Add BCM2711 DVP binding Maxime Ripard
2020-02-25 18:17 ` Rob Herring
2020-02-24 9:06 ` [PATCH 27/89] clk: bcm: Add BCM2711 DVP driver Maxime Ripard
2020-03-13 1:00 ` Stephen Boyd
2020-03-23 10:56 ` Maxime Ripard
2020-03-25 2:20 ` Stephen Boyd
2020-02-24 9:06 ` [PATCH 28/89] ARM: dts: bcm2711: Add HDMI DVP Maxime Ripard
2020-02-24 9:06 ` [PATCH 29/89] dt-bindings: display: Convert VC4 bindings to schemas Maxime Ripard
2020-02-24 18:41 ` Rob Herring
2020-02-25 11:54 ` Maxime Ripard
2020-02-25 14:02 ` Rob Herring
2020-02-24 9:06 ` [PATCH 30/89] dt-bindings: display: vc4: dpi: Add missing clock-names property Maxime Ripard
2020-02-25 18:17 ` Rob Herring
2020-02-24 9:06 ` [PATCH 31/89] dt-bindings: display: vc4: dsi: Add missing clock properties Maxime Ripard
2020-02-25 18:18 ` Rob Herring
2020-02-24 9:06 ` [PATCH 32/89] dt-bindings: display: vc4: hdmi: Add missing clock-names property Maxime Ripard
2020-02-25 18:18 ` Rob Herring
2020-02-24 9:06 ` [PATCH 33/89] dt-bindings: display: vc4: Document BCM2711 VC5 Maxime Ripard
2020-02-25 18:18 ` Rob Herring
2020-02-24 9:06 ` [PATCH 34/89] drm/vc4: drv: Add include guards Maxime Ripard
2020-02-24 9:06 ` [PATCH 35/89] drm/vc4: drv: Support BCM2711 Maxime Ripard
2020-02-24 9:06 ` [PATCH 36/89] drm/vc4: drv: Add support for the BCM2711 HVS5 Maxime Ripard
2020-02-24 9:06 ` [PATCH 37/89] drm/vc4: plane: Improve LBM usage Maxime Ripard
2020-02-24 9:06 ` [PATCH 38/89] drm/vc4: plane: Move planes creation to its own function Maxime Ripard
2020-02-24 9:06 ` [PATCH 39/89] drm/vc4: plane: Move additional planes creation to driver Maxime Ripard
2020-02-24 9:06 ` [PATCH 40/89] drm/vc4: plane: Register all the planes at once Maxime Ripard
2020-02-24 9:06 ` [PATCH 41/89] drm/vc4: plane: Create overlays for any CRTC Maxime Ripard
2020-02-24 9:06 ` [PATCH 42/89] drm/vc4: plane: Create more planes Maxime Ripard
2020-02-24 9:06 ` [PATCH 43/89] drm/vc4: crtc: Rename SoC data structures Maxime Ripard
2020-02-24 9:06 ` [PATCH 44/89] drm/vc4: crtc: Move crtc state to common header Maxime Ripard
2020-02-24 9:06 ` [PATCH 45/89] drm/vc4: crtc: Deal with different number of pixel per clock Maxime Ripard
2020-02-24 9:06 ` [PATCH 46/89] drm/vc4: crtc: Use a shared interrupt Maxime Ripard
2020-02-24 9:06 ` [PATCH 47/89] drm/vc4: crtc: Turn static const variable into a define Maxime Ripard
2020-02-24 9:06 ` [PATCH 48/89] drm/vc4: crtc: Move the cob allocation outside of bind Maxime Ripard
2020-02-24 9:06 ` [PATCH 49/89] drm/vc4: crtc: Rename HVS channel to output Maxime Ripard
2020-02-24 9:06 ` [PATCH 50/89] drm/vc4: crtc: Use local chan variable Maxime Ripard
2020-02-24 9:06 ` [PATCH 51/89] drm/vc4: crtc: Enable and disable the PV in atomic_enable / disable Maxime Ripard
2020-02-24 9:06 ` [PATCH 52/89] drm/vc4: crtc: Assign output to channel automatically Maxime Ripard
2020-02-24 9:06 ` [PATCH 53/89] drm/vc4: crtc: Add FIFO depth to vc4_crtc_data Maxime Ripard
2020-02-24 9:06 ` [PATCH 54/89] drm/vc4: crtc: Add function to compute FIFO level bits Maxime Ripard
2020-02-24 9:06 ` [PATCH 55/89] drm/vc4: crtc: Rename HDMI encoder type to HDMI0 Maxime Ripard
2020-02-24 9:06 ` [PATCH 56/89] drm/vc4: crtc: Add HDMI1 encoder type Maxime Ripard
2020-02-24 9:06 ` [PATCH 57/89] drm/vc4: crtc: Remove redundant call to drm_crtc_enable_color_mgmt Maxime Ripard
2020-02-24 9:07 ` [PATCH 58/89] drm/vc4: crtc: Disable color management for HVS5 Maxime Ripard
2020-02-24 9:07 ` [PATCH 59/89] dt-bindings: display: vc4: pv: Add BCM2711 pixel valves Maxime Ripard
2020-02-25 18:19 ` Rob Herring
2020-02-24 9:07 ` [PATCH 60/89] drm/vc4: crtc: Add BCM2711 pixelvalves Maxime Ripard
2020-02-24 9:07 ` [PATCH 61/89] drm/vc4: hdmi: Use debugfs private field Maxime Ripard
2020-02-24 9:07 ` [PATCH 62/89] drm/vc4: hdmi: Move structure to header Maxime Ripard
2020-02-24 9:07 ` [PATCH 63/89] drm/vc4: hdmi: rework connectors and encoders Maxime Ripard
2020-02-24 9:07 ` [PATCH 64/89] drm/vc4: hdmi: Remove DDC argument to connector_init Maxime Ripard
2020-02-24 9:07 ` [PATCH 65/89] drm/vc4: hdmi: Rename hdmi to vc4_hdmi Maxime Ripard
2020-02-24 9:07 ` [PATCH 66/89] drm/vc4: hdmi: Move accessors " Maxime Ripard
2020-02-24 9:07 ` [PATCH 67/89] drm/vc4: hdmi: Use local vc4_hdmi directly Maxime Ripard
2020-02-24 9:07 ` [PATCH 68/89] drm/vc4: hdmi: Add container_of macros for encoders and connectors Maxime Ripard
2020-02-24 9:07 ` [PATCH 69/89] drm/vc4: hdmi: Pass vc4_hdmi to CEC code Maxime Ripard
2020-02-24 9:07 ` [PATCH 70/89] drm/vc4: hdmi: Remove vc4_dev hdmi pointer Maxime Ripard
2020-02-24 9:07 ` [PATCH 71/89] drm/vc4: hdmi: Remove vc4_hdmi_connector Maxime Ripard
2020-02-24 9:07 ` [PATCH 72/89] drm/vc4: hdmi: Introduce resource init and variant Maxime Ripard
2020-02-24 9:07 ` [PATCH 73/89] drm/vc4: hdmi: Implement a register layout abstraction Maxime Ripard
2020-02-24 9:07 ` [PATCH 74/89] drm/vc4: hdmi: Add reset callback Maxime Ripard
2020-02-24 9:07 ` [PATCH 75/89] drm/vc4: hdmi: Add PHY init and disable function Maxime Ripard
2020-02-24 9:07 ` [PATCH 76/89] drm/vc4: hdmi: Add PHY RNG enable / " Maxime Ripard
2020-02-24 9:07 ` Maxime Ripard [this message]
2020-02-24 9:07 ` [PATCH 78/89] drm/vc4: hdmi: Add a set_timings callback Maxime Ripard
2020-02-24 9:07 ` [PATCH 79/89] drm/vc4: hdmi: Add HDMI ID Maxime Ripard
2020-02-24 9:07 ` [PATCH 80/89] drm/vc4: hdmi: Deal with multiple debugfs files Maxime Ripard
2020-02-24 9:07 ` [PATCH 81/89] drm/vc4: hdmi: Add an audio support flag Maxime Ripard
2020-02-24 9:07 ` [PATCH 82/89] drm/vc4: hdmi: Move CEC init to its own function Maxime Ripard
2020-02-24 9:07 ` [PATCH 83/89] drm/vc4: hdmi: Add CEC support flag Maxime Ripard
2020-02-24 9:07 ` [PATCH 84/89] drm/vc4: hdmi: Remove unused CEC_CLOCK_DIV define Maxime Ripard
2020-02-24 9:07 ` [PATCH 85/89] drm/vc4: hdmi: Rename drm_encoder pointer in mode_valid Maxime Ripard
2020-02-24 9:07 ` [PATCH 86/89] drm/vc4: hdmi: Adjust HSM clock rate depending on pixel rate Maxime Ripard
2020-03-16 12:54 ` Nicolas Saenz Julienne
2020-02-24 9:07 ` [PATCH 87/89] drm/vc4: hdmi: Support the BCM2711 HDMI controllers Maxime Ripard
2020-03-17 18:25 ` Daniel Rodriguez
2020-02-24 9:07 ` [PATCH 88/89] dt-bindings: display: vc4: hdmi: Add BCM2711 HDMI controllers bindings Maxime Ripard
2020-02-25 18:24 ` Rob Herring
2020-02-24 9:07 ` [PATCH 89/89] ARM: dts: bcm2711: Enable the display pipeline Maxime Ripard
2020-03-05 10:00 ` [PATCH 70/89] drm/vc4: hdmi: Remove vc4_dev hdmi pointer Jian-Hong Pan
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