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Message-ID: <20240930100610.782363-2-shiyongbang@huawei.com>
Date: Mon, 30 Sep 2024 18:06:07 +0800
From: shiyongbang <shiyongbang@...wei.com>
To: <xinliang.liu@...aro.org>, <tiantao6@...ilicon.com>,
<maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
<tzimmermann@...e.de>, <airlied@...il.com>, <daniel@...ll.ch>,
<kong.kongxinwei@...ilicon.com>
CC: <liangjian010@...wei.com>, <chenjianmin@...wei.com>,
<lidongming5@...wei.com>, <shiyongbang@...wei.com>, <libaihan@...wei.com>,
<shenjian15@...wei.com>, <shaojijie@...wei.com>,
<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH drm-dp 1/4] drm/hisilicon/hibmc: add dp aux in hibmc drivers
From: baihan li <libaihan@...wei.com>
Add dp aux read/write functions. They are basic functions
and will be used later.
Signed-off-by: baihan li <libaihan@...wei.com>
---
drivers/gpu/drm/hisilicon/hibmc/Makefile | 3 +-
drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c | 227 +++++++++++++++++++
drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.h | 80 +++++++
drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h | 88 +++++++
drivers/gpu/drm/hisilicon/hibmc/dp/dp_reg.h | 76 +++++++
5 files changed, 473 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c
create mode 100644 drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.h
create mode 100644 drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h
create mode 100644 drivers/gpu/drm/hisilicon/hibmc/dp/dp_reg.h
diff --git a/drivers/gpu/drm/hisilicon/hibmc/Makefile b/drivers/gpu/drm/hisilicon/hibmc/Makefile
index d25c75e60d3d..8770ec6dfffd 100644
--- a/drivers/gpu/drm/hisilicon/hibmc/Makefile
+++ b/drivers/gpu/drm/hisilicon/hibmc/Makefile
@@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0-only
-hibmc-drm-y := hibmc_drm_drv.o hibmc_drm_de.o hibmc_drm_vdac.o hibmc_drm_i2c.o
+hibmc-drm-y := hibmc_drm_drv.o hibmc_drm_de.o hibmc_drm_vdac.o hibmc_drm_i2c.o \
+ dp/dp_aux.o
obj-$(CONFIG_DRM_HISI_HIBMC) += hibmc-drm.o
diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c
new file mode 100644
index 000000000000..e85ac22c18a9
--- /dev/null
+++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.c
@@ -0,0 +1,227 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+// Copyright (c) 2024 Hisilicon Limited.
+
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/minmax.h>
+#include <drm/drm_device.h>
+#include <drm/drm_print.h>
+#include "dp_comm.h"
+#include "dp_reg.h"
+#include "dp_aux.h"
+
+static void dp_aux_reset(const struct hibmc_dp_aux *aux)
+{
+ dp_write_bits(aux->addr + DP_DPTX_RST_CTRL, DP_CFG_AUX_RST_N, 0x0);
+ usleep_range(10, 15);
+ dp_write_bits(aux->addr + DP_DPTX_RST_CTRL, DP_CFG_AUX_RST_N, 0x1);
+}
+
+static void dp_aux_read_data(struct hibmc_dp_aux *aux, u8 *buf, u8 size)
+{
+ u32 reg_num;
+ u32 value;
+ u32 num;
+ u8 i, j;
+
+ reg_num = round_up(size, AUX_4_BYTE) / AUX_4_BYTE;
+ for (i = 0; i < reg_num; i++) {
+ /* number of bytes read from a single register */
+ num = min(size - i * AUX_4_BYTE, AUX_4_BYTE);
+ value = readl(aux->addr + DP_AUX_RD_DATA0 + i * AUX_4_BYTE);
+ /* convert the 32-bit value of the register to the buffer. */
+ for (j = 0; j < num; j++)
+ buf[i * AUX_4_BYTE + j] = value >> (j * AUX_8_BIT);
+ }
+}
+
+static void dp_aux_write_data(struct hibmc_dp_aux *aux, u8 *buf, u8 size)
+{
+ u32 reg_num;
+ u32 value;
+ u8 i, j;
+ u32 num;
+
+ reg_num = round_up(size, AUX_4_BYTE) / AUX_4_BYTE;
+ for (i = 0; i < reg_num; i++) {
+ /* number of bytes written to a single register */
+ num = min_t(u8, size - i * AUX_4_BYTE, AUX_4_BYTE);
+ value = 0;
+ /* obtain the 32-bit value written to a single register. */
+ for (j = 0; j < num; j++)
+ value |= buf[i * AUX_4_BYTE + j] << (j * AUX_8_BIT);
+ /* writing data to a single register */
+ writel(value, aux->addr + DP_AUX_WR_DATA0 + i * AUX_4_BYTE);
+ }
+}
+
+static u32 dp_aux_build_cmd(const struct hibmc_dp_aux_msg *msg)
+{
+ u32 aux_cmd = msg->request << AUX_CMD_REQ_TYPE_S;
+
+ if (msg->size)
+ aux_cmd |= (msg->size - 1) << AUX_CMD_REQ_LEN_S;
+ else
+ aux_cmd |= 1 << AUX_CMD_I2C_ADDR_ONLY_S;
+
+ aux_cmd |= msg->address << AUX_CMD_ADDR_S;
+
+ return aux_cmd;
+}
+
+/* ret >= 0 ,ret is size; ret < 0, ret is err code */
+static int dp_aux_parse_xfer(struct hibmc_dp_aux *aux, struct hibmc_dp_aux_msg *msg)
+{
+ u32 buf_data_cnt;
+ u32 aux_status;
+ int ret = 0;
+
+ aux_status = readl(aux->addr + DP_AUX_STATUS);
+ msg->reply = (aux_status & DP_CFG_AUX_STATUS) >> DP_CFG_AUX_STATUS_S;
+
+ if (aux_status & DP_CFG_AUX_TIMEOUT)
+ return -ETIMEDOUT;
+
+ /* only address */
+ if (!msg->size)
+ return 0;
+
+ if (msg->reply != DP_AUX_ACK)
+ return 0;
+
+ buf_data_cnt = (aux_status & DP_CFG_AUX_READY_DATA_BYTE) >> AUX_READY_DATA_BYTE_S;
+
+ switch (msg->request) {
+ case DP_NATIVE_W:
+ ret = msg->size;
+ break;
+ case DP_I2C_MOT_W:
+ if (buf_data_cnt == AUX_I2C_WRITE_SUCCESS)
+ ret = msg->size;
+ else if (buf_data_cnt == AUX_I2C_WRITE_PARTIAL_SUCCESS)
+ ret = (aux_status & DP_CFG_AUX) >> DP_CFG_AUX_S;
+ break;
+ case DP_NATIVE_R:
+ case DP_I2C_MOT_R:
+ buf_data_cnt--;
+ /* only the successful part of data is read */
+ if (buf_data_cnt != msg->size) {
+ ret = -EBUSY;
+ } else { /* all data is successfully read */
+ dp_aux_read_data(aux, msg->buf, msg->size);
+ ret = msg->size;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+/* ret >= 0 ,ret is size; ret < 0, ret is err code */
+static int dp_aux_xfer(struct hibmc_dp_aux *aux, struct hibmc_dp_aux_msg *msg)
+{
+ u32 aux_cmd;
+ int ret;
+ u32 val; /* val will be assigned at the beginning of readl_poll_timeout function */
+
+ aux_cmd = dp_aux_build_cmd(msg);
+ writel(aux_cmd, aux->addr + DP_AUX_CMD_ADDR);
+
+ /* enable aux transfer */
+ dp_write_bits(aux->addr + DP_AUX_REQ, DP_CFG_AUX_REQ, 0x1);
+ ret = readl_poll_timeout(aux->addr + DP_AUX_REQ, val, !(val & DP_CFG_AUX_REQ), 50, 5000);
+ if (ret) {
+ dp_aux_reset(aux);
+ return ret;
+ }
+
+ return dp_aux_parse_xfer(aux, msg);
+}
+
+/* ret >= 0 ,ret is size; ret < 0, ret is err code */
+static int dp_aux_rw(struct hibmc_dp_aux *aux, u32 address, u8 *buffer, u8 request, u8 size)
+{
+ struct hibmc_dp_aux_msg msg;
+ u32 retry;
+ int ret;
+
+ msg.address = address;
+ msg.request = request;
+ msg.buf = buffer;
+ msg.size = size;
+
+ mutex_lock(&aux->lock);
+
+ writel(0, aux->addr + DP_AUX_WR_DATA0);
+ writel(0, aux->addr + DP_AUX_WR_DATA1);
+ writel(0, aux->addr + DP_AUX_WR_DATA2);
+ writel(0, aux->addr + DP_AUX_WR_DATA3);
+
+ dp_aux_write_data(aux, buffer, size);
+
+ for (retry = 0; retry < AUX_RW_MAX_RETRY; retry++) {
+ ret = dp_aux_xfer(aux, &msg);
+ if (ret < 0) {
+ if (ret == -EBUSY) {
+ usleep_range(450, 500);
+ continue;
+ } else if (ret == -ETIMEDOUT) {
+ continue;
+ } else {
+ goto exit;
+ }
+ }
+ switch (msg.reply & DP_AUX_NATIVE_REPLY_MASK) {
+ case DP_AUX_ACK:
+ goto exit;
+ case DP_AUX_NACK:
+ case DP_AUX_DEFER:
+ usleep_range(450, 500);
+ continue;
+ default:
+ ret = -EINVAL;
+ goto exit;
+ }
+ }
+
+exit:
+ mutex_unlock(&aux->lock);
+
+ return ret;
+}
+
+int dp_aux_write(struct hibmc_dp_dev *dp, u32 address, u8 *buffer, u8 size)
+{
+ int ret;
+
+ ret = dp_aux_rw(&dp->aux, address, buffer, DP_NATIVE_W, size);
+ if (ret != size) {
+ drm_err(dp->dev, "dp aux dpcd write failed, address:0x%x, size:%u, ret:%d!\n",
+ address, size, ret);
+ if (ret < 0)
+ return ret;
+ else
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+int dp_aux_read(struct hibmc_dp_dev *dp, u32 address, u8 *buffer, u8 size)
+{
+ int ret;
+
+ ret = dp_aux_rw(&dp->aux, address, buffer, DP_NATIVE_R, size);
+ if (ret != size) {
+ drm_err(dp->dev, "dp aux dpcd read failed, address:0x%x, size:%u, ret:%d!\n",
+ address, size, ret);
+ if (ret < 0)
+ return ret;
+ else
+ return -EFAULT;
+ }
+
+ return 0;
+}
diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.h b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.h
new file mode 100644
index 000000000000..9b738cf2cc6a
--- /dev/null
+++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_aux.h
@@ -0,0 +1,80 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Copyright (c) 2024 Hisilicon Limited. */
+
+#ifndef DP_AUX_H
+#define DP_AUX_H
+
+#include <linux/bitops.h>
+#include "dp_comm.h"
+
+#define DP_I2C_MOT_W 0x4
+#define DP_I2C_MOT_R 0x5
+#define DP_NATIVE_W 0x8
+#define DP_NATIVE_R 0x9
+
+#define AUX_I2C_WRITE_SUCCESS 0x1
+#define AUX_I2C_WRITE_PARTIAL_SUCCESS 0x2
+
+#define EQ_MAX_RETRY 5
+#define AUX_RW_MAX_RETRY 7
+
+#define DPCD_LINK_BW_SET 0x0100
+#define DPCD_LANE_COUNT_SET 0x0101
+#define DPCD_TRAINING_PATTERN_SET 0x0102
+#define DPCD_TRAINING_LANE0_SET 0x0103
+#define DPCD_DOWNSPREAD_CTRL 0x0107
+#define DPCD_LANE0_1_STATUS 0x0202
+#define DPCD_ADJUST_REQUEST_LANE0_1 0x0206
+
+#define DPCD_VOLTAGE_SWING_LANE_0 (BIT(0) | BIT(1))
+#define DPCD_PRE_EMPHASIS_LANE_0 (BIT(2) | BIT(3))
+#define DPCD_VOLTAGE_SWING_SET_S 0
+#define DPCD_PRE_EMPHASIS_SET_S 3
+#define DPCD_SCRAMBLING_DISABLE BIT(5)
+#define DPCD_CR_DONE_BITS BIT(0)
+#define DPCD_EQ_DONE_BITS (BIT(0) | BIT(1) | BIT(2))
+#define DPCD_ENHANCED_FRAME_EN 0x80
+
+#define DPCD_TRAINING_PATTERN_DISABLE 0x0
+#define DPCD_TRAINING_PATTERN_1 0x1
+#define DPCD_TRAINING_PATTERN_2 0x2
+#define DPCD_TRAINING_PATTERN_3 0x3
+#define DPCD_TRAINING_PATTERN_4 0x7
+#define DPCD_VOLTAGE_SWING_LEVEL_0 FIELD_PREP(GENMASK(1, 0), 0)
+#define DPCD_VOLTAGE_SWING_LEVEL_1 FIELD_PREP(GENMASK(1, 0), 1)
+#define DPCD_VOLTAGE_SWING_LEVEL_2 FIELD_PREP(GENMASK(1, 0), 2)
+#define DPCD_VOLTAGE_SWING_LEVEL_3 FIELD_PREP(GENMASK(1, 0), 3)
+#define DPCD_PRE_EMPHASIS_LEVEL_0 FIELD_PREP(GENMASK(4, 3), 0)
+#define DPCD_PRE_EMPHASIS_LEVEL_1 FIELD_PREP(GENMASK(4, 3), 1)
+#define DPCD_PRE_EMPHASIS_LEVEL_2 FIELD_PREP(GENMASK(4, 3), 2)
+#define DPCD_PRE_EMPHASIS_LEVEL_3 FIELD_PREP(GENMASK(4, 3), 3)
+
+#define DP_LINK_RATE_NUM 4
+#define DP_LINK_RATE_0 0x6
+#define DP_LINK_RATE_1 0xA
+#define DP_LINK_RATE_2 0x14
+#define DP_LINK_RATE_3 0x1E
+#define DP_AUX_NATIVE_REPLY_MASK (0x3 << 4)
+#define DP_AUX_ACK (0 << 4)
+#define DP_AUX_NACK (0x1 << 4)
+#define DP_AUX_DEFER (0x2 << 4)
+#define DP_CFG_AUX_S 17
+#define DP_CFG_AUX_STATUS_S 4
+
+#define AUX_4_BYTE 4
+#define AUX_4_BIT 4
+#define AUX_8_BIT 8
+#define AUX_RESET_INTERVAL 15
+#define AUX_RETRY_INTERVAL 500
+#define AUX_READY_DATA_BYTE_S 12
+
+/* aux_cmd_addr register shift */
+#define AUX_CMD_REQ_TYPE_S 0
+#define AUX_CMD_REQ_LEN_S 4
+#define AUX_CMD_ADDR_S 8
+#define AUX_CMD_I2C_ADDR_ONLY_S 28
+
+int dp_aux_write(struct hibmc_dp_dev *dp, u32 address, u8 *buffer, u8 size);
+int dp_aux_read(struct hibmc_dp_dev *dp, u32 address, u8 *buffer, u8 size);
+
+#endif
diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h
new file mode 100644
index 000000000000..931f08a70bb4
--- /dev/null
+++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_comm.h
@@ -0,0 +1,88 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Copyright (c) 2024 Hisilicon Limited. */
+
+#ifndef DP_COMM_H
+#define DP_COMM_H
+
+#include <linux/types.h>
+#include <linux/bitops.h>
+#include <linux/errno.h>
+#include <linux/mutex.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+
+#define REG_LENGTH 32
+
+static inline u32 dp_read_bits(void __iomem *addr, u32 bit_mask)
+{
+ u32 reg_val;
+
+ reg_val = readl(addr);
+
+ return (reg_val & bit_mask) >> __ffs(bit_mask);
+}
+
+static inline void dp_write_bits(void __iomem *addr, u32 bit_mask, u32 val)
+{
+ u32 reg_val;
+
+ reg_val = readl(addr);
+ reg_val &= ~bit_mask;
+ reg_val |= (val << __ffs(bit_mask)) & bit_mask;
+ writel(reg_val, addr);
+}
+
+enum dpcd_revision {
+ DPCD_REVISION_10 = 0x10,
+ DPCD_REVISION_11,
+ DPCD_REVISION_12,
+ DPCD_REVISION_13,
+ DPCD_REVISION_14,
+};
+
+struct hibmc_dp_aux_msg {
+ u32 address;
+ u8 request;
+ u8 *buf;
+ u8 size;
+ u8 reply;
+};
+
+struct hibmc_dp_aux {
+ struct mutex lock; /* aux transfer lock */
+ void __iomem *addr;
+};
+
+struct link_status {
+ bool clock_recovered;
+ bool channel_equalized;
+ u8 cr_done_lanes;
+};
+
+struct link_cap {
+ enum dpcd_revision rx_dpcd_revision;
+ u8 link_rate;
+ u8 lanes;
+ bool is_tps3;
+ bool is_tps4;
+};
+
+struct hibmc_dp_link {
+ struct link_status status;
+ u8 *train_set;
+ struct link_cap cap;
+};
+
+struct hibmc_dp_dev {
+ struct hibmc_dp_link link;
+ struct hibmc_dp_aux aux;
+ struct drm_device *dev;
+ void __iomem *base;
+};
+
+static inline struct hibmc_dp_dev *to_dp_dev_s(struct hibmc_dp_aux *aux)
+{
+ return container_of(aux, struct hibmc_dp_dev, aux);
+}
+
+#endif
diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_reg.h b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_reg.h
new file mode 100644
index 000000000000..3dcb847057a4
--- /dev/null
+++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_reg.h
@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Copyright (c) 2024 Hisilicon Limited. */
+
+#ifndef DP_REG_H
+#define DP_REG_H
+
+#define DP_AUX_CMD_ADDR 0x50
+#define DP_AUX_WR_DATA0 0x54
+#define DP_AUX_WR_DATA1 0x58
+#define DP_AUX_WR_DATA2 0x5c
+#define DP_AUX_WR_DATA3 0x60
+#define DP_AUX_RD_DATA0 0x64
+#define DP_AUX_REQ 0x74
+#define DP_AUX_STATUS 0x78
+#define DP_PHYIF_CTRL0 0xa0
+#define DP_VIDEO_CTRL 0x100
+#define DP_VIDEO_CONFIG0 0x104
+#define DP_VIDEO_CONFIG1 0x108
+#define DP_VIDEO_CONFIG2 0x10c
+#define DP_VIDEO_CONFIG3 0x110
+#define DP_VIDEO_PACKET 0x114
+#define DP_VIDEO_MSA0 0x118
+#define DP_VIDEO_MSA1 0x11c
+#define DP_VIDEO_MSA2 0x120
+#define DP_VIDEO_HORIZONTAL_SIZE 0X124
+#define DP_TIMING_GEN_CONFIG0 0x26c
+#define DP_TIMING_GEN_CONFIG2 0x274
+#define DP_TIMING_GEN_CONFIG3 0x278
+#define DP_HDCP_CFG 0x600
+#define DP_INTR_ENABLE 0x720
+#define DP_INTR_ORIGINAL_STATUS 0x728
+#define DP_DPTX_RST_CTRL 0x700
+#define DP_DPTX_CLK_CTRL 0x704
+#define DP_DPTX_GCTL0 0x708
+#define DP_TIMING_MODEL_CTRL 0x884
+#define DP_TIMING_SYNC_CTRL 0xFF0
+
+#define DP_CFG_AUX_SYNC_LEN_SEL BIT(1)
+#define DP_CFG_AUX_TIMER_TIMEOUT BIT(2)
+#define DP_CFG_STREAM_FRAME_MODE BIT(6)
+#define DP_CFG_AUX_MIN_PULSE_NUM GENMASK(13, 9)
+#define DP_CFG_LANE_DATA_EN GENMASK(11, 8)
+#define DP_CFG_PHY_LANE_NUM GENMASK(2, 1)
+#define DP_CFG_AUX_REQ BIT(0)
+#define DP_CFG_AUX_RST_N BIT(4)
+#define DP_CFG_AUX_TIMEOUT BIT(0)
+#define DP_CFG_AUX_READY_DATA_BYTE GENMASK(16, 12)
+#define DP_CFG_AUX GENMASK(24, 17)
+#define DP_CFG_AUX_STATUS GENMASK(11, 4)
+#define DP_CFG_SCRAMBLE_EN BIT(0)
+#define DP_CFG_PAT_SEL GENMASK(7, 4)
+#define DP_CFG_TIMING_GEN0_HACTIVE GENMASK(31, 16)
+#define DP_CFG_TIMING_GEN0_HBLANK GENMASK(15, 0)
+#define DP_CFG_TIMING_GEN0_VACTIVE GENMASK(31, 16)
+#define DP_CFG_TIMING_GEN0_VBLANK GENMASK(15, 0)
+#define DP_CFG_TIMING_GEN0_VFRONT_PORCH GENMASK(31, 16)
+#define DP_CFG_STREAM_HACTIVE GENMASK(31, 16)
+#define DP_CFG_STREAM_HBLANK GENMASK(15, 0)
+#define DP_CFG_STREAM_HSYNC_WIDTH GENMASK(15, 0)
+#define DP_CFG_STREAM_VACTIVE GENMASK(31, 16)
+#define DP_CFG_STREAM_VBLANK GENMASK(15, 0)
+#define DP_CFG_STREAM_VFRONT_PORCH GENMASK(31, 16)
+#define DP_CFG_STREAM_VSYNC_WIDTH GENMASK(15, 0)
+#define DP_CFG_STREAM_VSTART GENMASK(31, 16)
+#define DP_CFG_STREAM_HSTART GENMASK(15, 0)
+#define DP_CFG_STREAM_VSYNC_POLARITY BIT(8)
+#define DP_CFG_STREAM_HSYNC_POLARITY BIT(7)
+#define DP_CFG_STREAM_RGB_ENABLE BIT(1)
+#define DP_CFG_STREAM_VIDEO_MAPPING GENMASK(5, 2)
+#define DP_CFG_PIXEL_NUM_TIMING_MODE_SEL1 GENMASK(31, 16)
+#define DP_CFG_STREAM_TU_SYMBOL_SIZE GENMASK(5, 0)
+#define DP_CFG_STREAM_TU_SYMBOL_FRAC_SIZE GENMASK(9, 6)
+#define DP_CFG_STREAM_HTOTAL_SIZE GENMASK(31, 16)
+#define DP_CFG_STREAM_HBLANK_SIZE GENMASK(15, 0)
+
+#endif
--
2.33.0
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