drm/hisilicon/hibmc: add dp hw moduel in hibmc driver

Build a dp level that hibmc driver can enable dp by
calling their functions.

Signed-off-by: Baihan Li <libaihan@huawei.com>
Signed-off-by: Yongbang Shi <shiyongbang@huawei.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Tian Tao <tiantao6@hisilicon.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250103093824.1963816-4-shiyongbang@huawei.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

drivers/gpu/drm/hisilicon/hibmc/Makefile

@@ -1,5 +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 \
-	       dp/dp_aux.o dp/dp_link.o
+	       dp/dp_aux.o dp/dp_link.o dp/dp_hw.o
 
 obj-$(CONFIG_DRM_HISI_HIBMC) += hibmc-drm.o

drivers/gpu/drm/hisilicon/hibmc/dp/dp_config.h

@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Copyright (c) 2024 Hisilicon Limited. */
+
+#ifndef DP_CONFIG_H
+#define DP_CONFIG_H
+
+#define HIBMC_DP_BPP			24
+#define HIBMC_DP_SYMBOL_PER_FCLK	4
+#define HIBMC_DP_MSA1			0x20
+#define HIBMC_DP_MSA2			0x845c00
+#define HIBMC_DP_OFFSET			0x1e0000
+#define HIBMC_DP_HDCP			0x2
+#define HIBMC_DP_INT_RST		0xffff
+#define HIBMC_DP_DPTX_RST		0x3ff
+#define HIBMC_DP_CLK_EN			0x7
+#define HIBMC_DP_SYNC_EN_MASK		0x3
+#define HIBMC_DP_LINK_RATE_CAL		27
+
+#endif

drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c

@@ -0,0 +1,220 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+// Copyright (c) 2024 Hisilicon Limited.
+
+#include <linux/io.h>
+#include <linux/delay.h>
+#include "dp_config.h"
+#include "dp_comm.h"
+#include "dp_reg.h"
+#include "dp_hw.h"
+
+static void hibmc_dp_set_tu(struct hibmc_dp_dev *dp, struct drm_display_mode *mode)
+{
+	u32 tu_symbol_frac_size;
+	u32 tu_symbol_size;
+	u32 rate_ks;
+	u8 lane_num;
+	u32 value;
+	u32 bpp;
+
+	lane_num = dp->link.cap.lanes;
+	if (lane_num == 0) {
+		drm_err(dp->dev, "set tu failed, lane num cannot be 0!\n");
+		return;
+	}
+
+	bpp = HIBMC_DP_BPP;
+	rate_ks = dp->link.cap.link_rate * HIBMC_DP_LINK_RATE_CAL;
+	value = (mode->clock * bpp * 5) / (61 * lane_num * rate_ks);
+
+	if (value % 10 == 9) { /* 9 carry */
+		tu_symbol_size = value / 10 + 1;
+		tu_symbol_frac_size = 0;
+	} else {
+		tu_symbol_size = value / 10;
+		tu_symbol_frac_size = value % 10 + 1;
+	}
+
+	drm_dbg_dp(dp->dev, "tu value: %u.%u value: %u\n",
+		   tu_symbol_size, tu_symbol_frac_size, value);
+
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_VIDEO_PACKET,
+				 HIBMC_DP_CFG_STREAM_TU_SYMBOL_SIZE, tu_symbol_size);
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_VIDEO_PACKET,
+				 HIBMC_DP_CFG_STREAM_TU_SYMBOL_FRAC_SIZE, tu_symbol_frac_size);
+}
+
+static void hibmc_dp_set_sst(struct hibmc_dp_dev *dp, struct drm_display_mode *mode)
+{
+	u32 hblank_size;
+	u32 htotal_size;
+	u32 htotal_int;
+	u32 hblank_int;
+	u32 fclk; /* flink_clock */
+
+	fclk = dp->link.cap.link_rate * HIBMC_DP_LINK_RATE_CAL;
+
+	/* Considering the effect of spread spectrum, the value may be deviated.
+	 * The coefficient (0.9947) is used to offset the deviation.
+	 */
+	htotal_int = mode->htotal * 9947 / 10000;
+	htotal_size = htotal_int * fclk / (HIBMC_DP_SYMBOL_PER_FCLK * (mode->clock / 1000));
+
+	hblank_int = mode->htotal - mode->hdisplay - mode->hdisplay * 53 / 10000;
+	hblank_size = hblank_int * fclk * 9947 /
+		      (mode->clock * 10 * HIBMC_DP_SYMBOL_PER_FCLK);
+
+	drm_dbg_dp(dp->dev, "h_active %u v_active %u htotal_size %u hblank_size %u",
+		   mode->hdisplay, mode->vdisplay, htotal_size, hblank_size);
+	drm_dbg_dp(dp->dev, "flink_clock %u pixel_clock %d", fclk, mode->clock / 1000);
+
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_VIDEO_HORIZONTAL_SIZE,
+				 HIBMC_DP_CFG_STREAM_HTOTAL_SIZE, htotal_size);
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_VIDEO_HORIZONTAL_SIZE,
+				 HIBMC_DP_CFG_STREAM_HBLANK_SIZE, hblank_size);
+}
+
+static void hibmc_dp_link_cfg(struct hibmc_dp_dev *dp, struct drm_display_mode *mode)
+{
+	u32 timing_delay;
+	u32 vblank;
+	u32 hstart;
+	u32 vstart;
+
+	vblank = mode->vtotal - mode->vdisplay;
+	timing_delay = mode->htotal - mode->hsync_start;
+	hstart = mode->htotal - mode->hsync_start;
+	vstart = mode->vtotal - mode->vsync_start;
+
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_TIMING_GEN_CONFIG0,
+				 HIBMC_DP_CFG_TIMING_GEN0_HBLANK, mode->htotal - mode->hdisplay);
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_TIMING_GEN_CONFIG0,
+				 HIBMC_DP_CFG_TIMING_GEN0_HACTIVE, mode->hdisplay);
+
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_TIMING_GEN_CONFIG2,
+				 HIBMC_DP_CFG_TIMING_GEN0_VBLANK, vblank);
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_TIMING_GEN_CONFIG2,
+				 HIBMC_DP_CFG_TIMING_GEN0_VACTIVE, mode->vdisplay);
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_TIMING_GEN_CONFIG3,
+				 HIBMC_DP_CFG_TIMING_GEN0_VFRONT_PORCH,
+				 mode->vsync_start - mode->vdisplay);
+
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_VIDEO_CONFIG0,
+				 HIBMC_DP_CFG_STREAM_HACTIVE, mode->hdisplay);
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_VIDEO_CONFIG0,
+				 HIBMC_DP_CFG_STREAM_HBLANK, mode->htotal - mode->hdisplay);
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_VIDEO_CONFIG2,
+				 HIBMC_DP_CFG_STREAM_HSYNC_WIDTH,
+				 mode->hsync_end - mode->hsync_start);
+
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_VIDEO_CONFIG1,
+				 HIBMC_DP_CFG_STREAM_VACTIVE, mode->vdisplay);
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_VIDEO_CONFIG1,
+				 HIBMC_DP_CFG_STREAM_VBLANK, vblank);
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_VIDEO_CONFIG3,
+				 HIBMC_DP_CFG_STREAM_VFRONT_PORCH,
+				 mode->vsync_start - mode->vdisplay);
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_VIDEO_CONFIG3,
+				 HIBMC_DP_CFG_STREAM_VSYNC_WIDTH,
+				 mode->vsync_end - mode->vsync_start);
+
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_VIDEO_MSA0,
+				 HIBMC_DP_CFG_STREAM_VSTART, vstart);
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_VIDEO_MSA0,
+				 HIBMC_DP_CFG_STREAM_HSTART, hstart);
+
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_VIDEO_CTRL, HIBMC_DP_CFG_STREAM_VSYNC_POLARITY,
+				 mode->flags & DRM_MODE_FLAG_PVSYNC ? 1 : 0);
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_VIDEO_CTRL, HIBMC_DP_CFG_STREAM_HSYNC_POLARITY,
+				 mode->flags & DRM_MODE_FLAG_PHSYNC ? 1 : 0);
+
+	/* MSA mic 0 and 1 */
+	writel(HIBMC_DP_MSA1, dp->base + HIBMC_DP_VIDEO_MSA1);
+	writel(HIBMC_DP_MSA2, dp->base + HIBMC_DP_VIDEO_MSA2);
+
+	hibmc_dp_set_tu(dp, mode);
+
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_VIDEO_CTRL, HIBMC_DP_CFG_STREAM_RGB_ENABLE, 0x1);
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_VIDEO_CTRL, HIBMC_DP_CFG_STREAM_VIDEO_MAPPING, 0);
+
+	/* divide 2: up even */
+	if (timing_delay % 2)
+		timing_delay++;
+
+	hibmc_dp_reg_write_field(dp, HIBMC_DP_TIMING_MODEL_CTRL,
+				 HIBMC_DP_CFG_PIXEL_NUM_TIMING_MODE_SEL1, timing_delay);
+
+	hibmc_dp_set_sst(dp, mode);
+}
+
+int hibmc_dp_hw_init(struct hibmc_dp *dp)
+{
+	struct drm_device *drm_dev = dp->drm_dev;
+	struct hibmc_dp_dev *dp_dev;
+
+	dp_dev = devm_kzalloc(drm_dev->dev, sizeof(struct hibmc_dp_dev), GFP_KERNEL);
+	if (!dp_dev)
+		return -ENOMEM;
+
+	mutex_init(&dp_dev->lock);
+
+	dp->dp_dev = dp_dev;
+
+	dp_dev->dev = drm_dev;
+	dp_dev->base = dp->mmio + HIBMC_DP_OFFSET;
+
+	hibmc_dp_aux_init(dp_dev);
+
+	dp_dev->link.cap.lanes = 0x2;
+	dp_dev->link.cap.link_rate = DP_LINK_BW_2_7;
+
+	/* hdcp data */
+	writel(HIBMC_DP_HDCP, dp_dev->base + HIBMC_DP_HDCP_CFG);
+	/* int init */
+	writel(0, dp_dev->base + HIBMC_DP_INTR_ENABLE);
+	writel(HIBMC_DP_INT_RST, dp_dev->base + HIBMC_DP_INTR_ORIGINAL_STATUS);
+	/* rst */
+	writel(HIBMC_DP_DPTX_RST, dp_dev->base + HIBMC_DP_DPTX_RST_CTRL);
+	/* clock enable */
+	writel(HIBMC_DP_CLK_EN, dp_dev->base + HIBMC_DP_DPTX_CLK_CTRL);
+
+	return 0;
+}
+
+void hibmc_dp_display_en(struct hibmc_dp *dp, bool enable)
+{
+	struct hibmc_dp_dev *dp_dev = dp->dp_dev;
+
+	if (enable) {
+		hibmc_dp_reg_write_field(dp_dev, HIBMC_DP_VIDEO_CTRL, BIT(0), 0x1);
+		writel(HIBMC_DP_SYNC_EN_MASK, dp_dev->base + HIBMC_DP_TIMING_SYNC_CTRL);
+		hibmc_dp_reg_write_field(dp_dev, HIBMC_DP_DPTX_GCTL0, BIT(10), 0x1);
+		writel(HIBMC_DP_SYNC_EN_MASK, dp_dev->base + HIBMC_DP_TIMING_SYNC_CTRL);
+	} else {
+		hibmc_dp_reg_write_field(dp_dev, HIBMC_DP_DPTX_GCTL0, BIT(10), 0);
+		writel(HIBMC_DP_SYNC_EN_MASK, dp_dev->base + HIBMC_DP_TIMING_SYNC_CTRL);
+		hibmc_dp_reg_write_field(dp_dev, HIBMC_DP_VIDEO_CTRL, BIT(0), 0);
+		writel(HIBMC_DP_SYNC_EN_MASK, dp_dev->base + HIBMC_DP_TIMING_SYNC_CTRL);
+	}
+
+	msleep(50);
+}
+
+int hibmc_dp_mode_set(struct hibmc_dp *dp, struct drm_display_mode *mode)
+{
+	struct hibmc_dp_dev *dp_dev = dp->dp_dev;
+	int ret;
+
+	if (!dp_dev->link.status.channel_equalized) {
+		ret = hibmc_dp_link_training(dp_dev);
+		if (ret) {
+			drm_err(dp->drm_dev, "dp link training failed, ret: %d\n", ret);
+			return ret;
+		}
+	}
+
+	hibmc_dp_display_en(dp, false);
+	hibmc_dp_link_cfg(dp_dev, mode);
+
+	return 0;
+}

drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h

@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Copyright (c) 2024 Hisilicon Limited. */
+
+#ifndef DP_KAPI_H
+#define DP_KAPI_H
+
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <drm/drm_device.h>
+#include <drm/drm_encoder.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_print.h>
+
+struct hibmc_dp_dev;
+
+struct hibmc_dp {
+	struct hibmc_dp_dev *dp_dev;
+	struct drm_device *drm_dev;
+	struct drm_encoder encoder;
+	struct drm_connector connector;
+	void __iomem *mmio;
+};
+
+int hibmc_dp_hw_init(struct hibmc_dp *dp);
+int hibmc_dp_mode_set(struct hibmc_dp *dp, struct drm_display_mode *mode);
+void hibmc_dp_display_en(struct hibmc_dp *dp, bool enable);
+
+#endif

drivers/gpu/drm/hisilicon/hibmc/dp/dp_reg.h

@@ -14,8 +14,26 @@
 #define HIBMC_DP_AUX_STATUS			0x78
 #define HIBMC_DP_PHYIF_CTRL0			0xa0
 #define HIBMC_DP_VIDEO_CTRL			0x100
+#define HIBMC_DP_VIDEO_CONFIG0			0x104
+#define HIBMC_DP_VIDEO_CONFIG1			0x108
+#define HIBMC_DP_VIDEO_CONFIG2			0x10c
+#define HIBMC_DP_VIDEO_CONFIG3			0x110
+#define HIBMC_DP_VIDEO_PACKET			0x114
+#define HIBMC_DP_VIDEO_MSA0			0x118
+#define HIBMC_DP_VIDEO_MSA1			0x11c
+#define HIBMC_DP_VIDEO_MSA2			0x120
+#define HIBMC_DP_VIDEO_HORIZONTAL_SIZE		0X124
+#define HIBMC_DP_TIMING_GEN_CONFIG0		0x26c
+#define HIBMC_DP_TIMING_GEN_CONFIG2		0x274
+#define HIBMC_DP_TIMING_GEN_CONFIG3		0x278
+#define HIBMC_DP_HDCP_CFG			0x600
 #define HIBMC_DP_DPTX_RST_CTRL			0x700
+#define HIBMC_DP_DPTX_CLK_CTRL			0x704
 #define HIBMC_DP_DPTX_GCTL0			0x708
+#define HIBMC_DP_INTR_ENABLE			0x720
+#define HIBMC_DP_INTR_ORIGINAL_STATUS		0x728
+#define HIBMC_DP_TIMING_MODEL_CTRL		0x884
+#define HIBMC_DP_TIMING_SYNC_CTRL		0xFF0
 
 #define HIBMC_DP_CFG_AUX_SYNC_LEN_SEL		BIT(1)
 #define HIBMC_DP_CFG_AUX_TIMER_TIMEOUT		BIT(2)
@@ -31,5 +49,28 @@
 #define HIBMC_DP_CFG_AUX_STATUS			GENMASK(11, 4)
 #define HIBMC_DP_CFG_SCRAMBLE_EN		BIT(0)
 #define HIBMC_DP_CFG_PAT_SEL			GENMASK(7, 4)
+#define HIBMC_DP_CFG_TIMING_GEN0_HACTIVE	GENMASK(31, 16)
+#define HIBMC_DP_CFG_TIMING_GEN0_HBLANK		GENMASK(15, 0)
+#define HIBMC_DP_CFG_TIMING_GEN0_VACTIVE	GENMASK(31, 16)
+#define HIBMC_DP_CFG_TIMING_GEN0_VBLANK		GENMASK(15, 0)
+#define HIBMC_DP_CFG_TIMING_GEN0_VFRONT_PORCH	GENMASK(31, 16)
+#define HIBMC_DP_CFG_STREAM_HACTIVE		GENMASK(31, 16)
+#define HIBMC_DP_CFG_STREAM_HBLANK		GENMASK(15, 0)
+#define HIBMC_DP_CFG_STREAM_HSYNC_WIDTH		GENMASK(15, 0)
+#define HIBMC_DP_CFG_STREAM_VACTIVE		GENMASK(31, 16)
+#define HIBMC_DP_CFG_STREAM_VBLANK		GENMASK(15, 0)
+#define HIBMC_DP_CFG_STREAM_VFRONT_PORCH	GENMASK(31, 16)
+#define HIBMC_DP_CFG_STREAM_VSYNC_WIDTH		GENMASK(15, 0)
+#define HIBMC_DP_CFG_STREAM_VSTART		GENMASK(31, 16)
+#define HIBMC_DP_CFG_STREAM_HSTART		GENMASK(15, 0)
+#define HIBMC_DP_CFG_STREAM_VSYNC_POLARITY	BIT(8)
+#define HIBMC_DP_CFG_STREAM_HSYNC_POLARITY	BIT(7)
+#define HIBMC_DP_CFG_STREAM_RGB_ENABLE		BIT(1)
+#define HIBMC_DP_CFG_STREAM_VIDEO_MAPPING	GENMASK(5, 2)
+#define HIBMC_DP_CFG_PIXEL_NUM_TIMING_MODE_SEL1	GENMASK(31, 16)
+#define HIBMC_DP_CFG_STREAM_TU_SYMBOL_SIZE	GENMASK(5, 0)
+#define HIBMC_DP_CFG_STREAM_TU_SYMBOL_FRAC_SIZE	GENMASK(9, 6)
+#define HIBMC_DP_CFG_STREAM_HTOTAL_SIZE		GENMASK(31, 16)
+#define HIBMC_DP_CFG_STREAM_HBLANK_SIZE		GENMASK(15, 0)
 
 #endif