Message-ID: <20220607084927.38432-1-kuohsiang_chou@aspeedtech.com>
Date:   Tue, 7 Jun 2022 16:49:27 +0800
From:   KuoHsiang Chou <kuohsiang_chou@...eedtech.com>
To:     <tzimmermann@...e.de>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>
CC:     <airlied@...hat.com>, <airlied@...ux.ie>, <daniel@...ll.ch>,
        <kuohsiang_chou@...eedtech.com>, <arc_sung@...eedtech.com>,
        <tommy_huang@...eedtech.com>, <hungju_huang@...eedtech.com>,
        <luke_chen@...eedtech.com>, kernel test robot <lkp@...el.com>
Subject: [PATCH v5] drm/ast: Create the driver for ASPEED proprietory Display-Port

V1:
1. The MCU FW controling ASPEED DP is loaded by BMC boot loader.
2. Driver starts after CR[3:1] == 111b that indicates Tx is ASTDP,
   and CRD1[5] has been asserted by BMVC boot loader.
3. EDID is prioritized by DP monitor.
4. DP's EDID has high priority to decide resolution supporting.

V2:
Modules description:
1. ASTDP (ASPEED DisplayPort) is controlled by dedicated
   AST-MCU (ASPEED propriatary MCU).
2. MCU is looping in charged of HPD, Read EDID, Link Training with
   DP sink.
3. ASTDP and AST-MUC reside in BMC (Baseboard Management controller)
   addressing-space.
4. ASPEED DRM driver requests MCU to get HPD and EDID by CR-scratched
   register.

Booting sequence:
1. Check if TX is ASTDP					// ast_dp_launch()
2. Check if DP-MCU FW has loaded					// ast_dp_launch()
3. Read EDID					// ast_dp_read_edid()
4. Resolution switch					// ast_dp_SetOutput()

V3:
1. Remove unneeded semicolon.
2. Apply to git://anongit.freedesktop.org/drm/drm, instead of
   git://anongit.freedesktop.org/drm/drm-misc
3. Resolve auto build test WARNINGs on V1 patch.

V4:
1. Sync code-base with kernel 5.17_rc6
2. Remove the define of DPControlPower, because DP chips need to be
   powered on to be used.
3. Remove the switches of PHY and Display from EDID procedure.
4. Revise increaing delay to fixed delay, because this version kernel
   doesn't detect minitor consistenntly.
5. Create clean-up code used for reset of power state on errors with
   -EIO manner.
6. Revise the DP detection by TX type and its DP-FW status during
   booting and resume.
7. Correct the CamelCase Style.
8. Use register reading while needing, and remove to hold full
   register.
9. Instead of 'u8', revise to 'bool' on swwitch of PHY and video.
10.Correct typo
11.Remove the duplicated copy of TX definition.
12.Use EDID_LENGTH as the constant of 128.

V5:
1.Fixed sparse:cast truncates bits form constant value ()cast
  truncates bits from constant value (ffffffffffffff00 becomes 0)

Signed-off-by: KuoHsiang Chou <kuohsiang_chou@...eedtech.com>
Reported-by: kernel test robot <lkp@...el.com>
---
 drivers/gpu/drm/ast/Makefile   |   2 +-
 drivers/gpu/drm/ast/ast_dp.c   | 282 +++++++++++++++++++++++++++++++++
 drivers/gpu/drm/ast/ast_drv.h  | 115 ++++++++++++++
 drivers/gpu/drm/ast/ast_main.c |   5 +-
 drivers/gpu/drm/ast/ast_mode.c | 124 ++++++++++++++-
 drivers/gpu/drm/ast/ast_post.c |   4 +-
 6 files changed, 524 insertions(+), 8 deletions(-)
 create mode 100644 drivers/gpu/drm/ast/ast_dp.c

diff --git a/drivers/gpu/drm/ast/Makefile b/drivers/gpu/drm/ast/Makefile
index 21f71160b..5a53ce51f 100644
--- a/drivers/gpu/drm/ast/Makefile
+++ b/drivers/gpu/drm/ast/Makefile
@@ -3,6 +3,6 @@
 # Makefile for the drm device driver.  This driver provides support for the
 # Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.

-ast-y := ast_drv.o ast_i2c.o ast_main.o ast_mm.o ast_mode.o ast_post.o ast_dp501.o
+ast-y := ast_drv.o ast_i2c.o ast_main.o ast_mm.o ast_mode.o ast_post.o ast_dp501.o ast_dp.o

 obj-$(CONFIG_DRM_AST) := ast.o
diff --git a/drivers/gpu/drm/ast/ast_dp.c b/drivers/gpu/drm/ast/ast_dp.c
new file mode 100644
index 000000000..1ae12c407
--- /dev/null
+++ b/drivers/gpu/drm/ast/ast_dp.c
@@ -0,0 +1,282 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2021, ASPEED Technology Inc.
+// Authors: KuoHsiang Chou <kuohsiang_chou@...eedtech.com>
+
+#include <linux/firmware.h>
+#include <linux/delay.h>
+#include <drm/drm_print.h>
+#include "ast_drv.h"
+
+int ast_astdp_read_edid(struct drm_device *dev, u8 *ediddata)
+{
+	struct ast_private *ast = to_ast_private(dev);
+	u8 i = 0, j = 0;
+
+	/*
+	 * CRD1[b5]: DP MCU FW is executing
+	 * CRDC[b0]: DP link success
+	 * CRDF[b0]: DP HPD
+	 * CRE5[b0]: Host reading EDID process is done
+	 */
+	if (!(ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD1, ASTDP_MCU_FW_EXECUTING) &&
+		ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDC, ASTDP_LINK_SUCCESS) &&
+		ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDF, ASTDP_HPD) &&
+		ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE5,
+								ASTDP_HOST_EDID_READ_DONE_MASK))) {
+		goto err_astdp_edid_not_ready;
+	}
+
+	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE5, (u8) ~ASTDP_HOST_EDID_READ_DONE_MASK,
+							0x00);
+
+	for (i = 0; i < 32; i++) {
+		/*
+		 * CRE4[7:0]: Read-Pointer for EDID (Unit: 4bytes); valid range: 0~64
+		 */
+		ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE4,
+					ASTDP_AND_CLEAR_MASK, (u8) i);
+		j = 0;
+
+		/*
+		 * CRD7[b0]: valid flag for EDID
+		 * CRD6[b0]: mirror read pointer for EDID
+		 */
+		while ((ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD7,
+				ASTDP_EDID_VALID_FLAG_MASK) != 0x01) ||
+			(ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD6,
+						ASTDP_EDID_READ_POINTER_MASK) != i)) {
+			/*
+			 * Delay are getting longer with each retry.
+			 * 1. The Delays are often 2 loops when users request "Display Settings"
+			 *	  of right-click of mouse.
+			 * 2. The Delays are often longer a lot when system resume from S3/S4.
+			 */
+			mdelay(j+1);
+
+			if (!(ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD1,
+							ASTDP_MCU_FW_EXECUTING) &&
+				ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDC,
+							ASTDP_LINK_SUCCESS) &&
+				ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDF, ASTDP_HPD))) {
+				goto err_astdp_jump_out_loop_of_edid;
+			}
+
+			j++;
+			if (j > 200)
+				goto err_astdp_jump_out_loop_of_edid;
+		}
+
+		*(ediddata) = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT,
+							0xD8, ASTDP_EDID_READ_DATA_MASK);
+		*(ediddata + 1) = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD9,
+								ASTDP_EDID_READ_DATA_MASK);
+		*(ediddata + 2) = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDA,
+								ASTDP_EDID_READ_DATA_MASK);
+		*(ediddata + 3) = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDB,
+								ASTDP_EDID_READ_DATA_MASK);
+
+		if (i == 31) {
+			/*
+			 * For 128-bytes EDID_1.3,
+			 * 1. Add the value of Bytes-126 to Bytes-127.
+			 *		The Bytes-127 is Checksum. Sum of all 128bytes should
+			 *		equal 0	(mod 256).
+			 * 2. Modify Bytes-126 to be 0.
+			 *		The Bytes-126 indicates the Number of extensions to
+			 *		follow. 0 represents noextensions.
+			 */
+			*(ediddata + 3) = *(ediddata + 3) + *(ediddata + 2);
+			*(ediddata + 2) = 0;
+		}
+
+		ediddata += 4;
+	}
+
+	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE5, (u8) ~ASTDP_HOST_EDID_READ_DONE_MASK,
+							ASTDP_HOST_EDID_READ_DONE);
+
+	return 0;
+
+err_astdp_jump_out_loop_of_edid:
+	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE5,
+							(u8) ~ASTDP_HOST_EDID_READ_DONE_MASK,
+							ASTDP_HOST_EDID_READ_DONE);
+	return (~(j+256) + 1);
+
+err_astdp_edid_not_ready:
+	if (!(ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD1, ASTDP_MCU_FW_EXECUTING)))
+		return (~0xD1 + 1);
+	if (!(ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDC, ASTDP_LINK_SUCCESS)))
+		return (~0xDC + 1);
+	if (!(ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDF, ASTDP_HPD)))
+		return (~0xDF + 1);
+	if (!(ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE5, ASTDP_HOST_EDID_READ_DONE_MASK)))
+		return (~0xE5 + 1);
+
+	return	0;
+}
+
+/*
+ * Launch Aspeed DP
+ */
+void ast_dp_launch(struct drm_device *dev, u8 bPower)
+{
+	u32 i = 0, j = 0, WaitCount = 1;
+	u8 bDPTX = 0;
+	u8 bDPExecute = 1;
+
+	struct ast_private *ast = to_ast_private(dev);
+	// S3 come back, need more time to wait BMC ready.
+	if (bPower)
+		WaitCount = 300;
+
+
+	// Wait total count by different condition.
+	for (j = 0; j < WaitCount; j++) {
+		bDPTX = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD1, TX_TYPE_MASK);
+
+		if (bDPTX)
+			break;
+
+		msleep(100);
+	}
+
+	// 0xE : ASTDP with DPMCU FW handling
+	if (bDPTX == ASTDP_DPMCU_TX) {
+		// Wait one second then timeout.
+		i = 0;
+
+		while (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xD1, COPROCESSOR_LAUNCH) !=
+			COPROCESSOR_LAUNCH) {
+			i++;
+			// wait 100 ms
+			msleep(100);
+
+			if (i >= 10) {
+				// DP would not be ready.
+				bDPExecute = 0;
+				break;
+			}
+		}
+
+		if (bDPExecute)
+			ast->tx_chip_type = AST_TX_ASTDP;
+
+		ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE5,
+							(u8) ~ASTDP_HOST_EDID_READ_DONE_MASK,
+							ASTDP_HOST_EDID_READ_DONE);
+	} else
+		ast->tx_chip_type = AST_TX_NONE;
+}
+
+
+
+void ast_dp_power_on_off(struct drm_device *dev, bool on)
+{
+	struct ast_private *ast = to_ast_private(dev);
+	// Read and Turn off DP PHY sleep
+	u8 bE3 = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE3, AST_DP_VIDEO_ENABLE);
+
+	// Turn on DP PHY sleep
+	if (!on)
+		bE3 |= AST_DP_PHY_SLEEP;
+
+	// DP Power on/off
+	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE3, (u8) ~AST_DP_PHY_SLEEP, bE3);
+}
+
+
+
+void ast_dp_set_on_off(struct drm_device *dev, bool on)
+{
+	struct ast_private *ast = to_ast_private(dev);
+	u8 video_on_off = on;
+
+	// Video On/Off
+	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE3, (u8) ~AST_DP_VIDEO_ENABLE, on);
+
+	// If DP plug in and link successful then check video on / off status
+	if (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDC, ASTDP_LINK_SUCCESS) &&
+		ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDF, ASTDP_HPD)) {
+		video_on_off <<= 4;
+		while (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDF,
+						ASTDP_MIRROR_VIDEO_ENABLE) != video_on_off) {
+			// wait 1 ms
+			mdelay(1);
+		}
+	}
+}
+
+void ast_dp_set_mode(struct drm_crtc *crtc, struct ast_vbios_mode_info *vbios_mode)
+{
+	struct ast_private *ast = to_ast_private(crtc->dev);
+
+	u32 ulRefreshRateIndex;
+	u8 ModeIdx;
+
+	ulRefreshRateIndex = vbios_mode->enh_table->refresh_rate_index - 1;
+
+	switch (crtc->mode.crtc_hdisplay) {
+	case 320:
+		ModeIdx = ASTDP_320x240_60;
+		break;
+	case 400:
+		ModeIdx = ASTDP_400x300_60;
+		break;
+	case 512:
+		ModeIdx = ASTDP_512x384_60;
+		break;
+	case 640:
+		ModeIdx = (ASTDP_640x480_60 + (u8) ulRefreshRateIndex);
+		break;
+	case 800:
+		ModeIdx = (ASTDP_800x600_56 + (u8) ulRefreshRateIndex);
+		break;
+	case 1024:
+		ModeIdx = (ASTDP_1024x768_60 + (u8) ulRefreshRateIndex);
+		break;
+	case 1152:
+		ModeIdx = ASTDP_1152x864_75;
+		break;
+	case 1280:
+		if (crtc->mode.crtc_vdisplay == 800)
+			ModeIdx = (ASTDP_1280x800_60_RB - (u8) ulRefreshRateIndex);
+		else		// 1024
+			ModeIdx = (ASTDP_1280x1024_60 + (u8) ulRefreshRateIndex);
+		break;
+	case 1360:
+	case 1366:
+		ModeIdx = ASTDP_1366x768_60;
+		break;
+	case 1440:
+		ModeIdx = (ASTDP_1440x900_60_RB - (u8) ulRefreshRateIndex);
+		break;
+	case 1600:
+		if (crtc->mode.crtc_vdisplay == 900)
+			ModeIdx = (ASTDP_1600x900_60_RB - (u8) ulRefreshRateIndex);
+		else		//1200
+			ModeIdx = ASTDP_1600x1200_60;
+		break;
+	case 1680:
+		ModeIdx = (ASTDP_1680x1050_60_RB - (u8) ulRefreshRateIndex);
+		break;
+	case 1920:
+		if (crtc->mode.crtc_vdisplay == 1080)
+			ModeIdx = ASTDP_1920x1080_60;
+		else		//1200
+			ModeIdx = ASTDP_1920x1200_60;
+		break;
+	default:
+		return;
+	}
+
+	/*
+	 * CRE0[7:0]: MISC0 ((0x00: 18-bpp) or (0x20: 24-bpp)
+	 * CRE1[7:0]: MISC1 (default: 0x00)
+	 * CRE2[7:0]: video format index (0x00 ~ 0x20 or 0x40 ~ 0x50)
+	 */
+	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE0, ASTDP_AND_CLEAR_MASK,
+				ASTDP_MISC0_24bpp);
+	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE1, ASTDP_AND_CLEAR_MASK, ASTDP_MISC1);
+	ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE2, ASTDP_AND_CLEAR_MASK, ModeIdx);
+}
diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h
index a19315b2f..79451130c 100644
--- a/drivers/gpu/drm/ast/ast_drv.h
+++ b/drivers/gpu/drm/ast/ast_drv.h
@@ -70,6 +70,7 @@ enum ast_tx_chip {
 	AST_TX_NONE,
 	AST_TX_SIL164,
 	AST_TX_DP501,
+	AST_TX_ASTDP,
 };

 #define AST_DRAM_512Mx16 0
@@ -184,6 +185,10 @@ struct ast_private {
 			struct drm_encoder encoder;
 			struct drm_connector connector;
 		} dp501;
+		struct {
+			struct drm_encoder encoder;
+			struct drm_connector connector;
+		} astdp;
 	} output;

 	bool support_wide_screen;
@@ -357,10 +362,113 @@ int ast_mode_config_init(struct ast_private *ast);
 #define AST_DP501_EDID_DATA	0xf020

 /* Define for Soc scratched reg */
+#define COPROCESSOR_LAUNCH			BIT(5)
+
+/*
+ * Display Transmitter Type:
+ */
+#define TX_TYPE_MASK				GENMASK(3, 1)
+#define NO_TX						(0 << 1)
+#define ITE66121_VBIOS_TX			(1 << 1)
+#define SI164_VBIOS_TX				(2 << 1)
+#define CH7003_VBIOS_TX			(3 << 1)
+#define DP501_VBIOS_TX				(4 << 1)
+#define ANX9807_VBIOS_TX			(5 << 1)
+#define TX_FW_EMBEDDED_FW_TX		(6 << 1)
+#define ASTDP_DPMCU_TX				(7 << 1)
+
 #define AST_VRAM_INIT_STATUS_MASK	GENMASK(7, 6)
 //#define AST_VRAM_INIT_BY_BMC		BIT(7)
 //#define AST_VRAM_INIT_READY		BIT(6)

+/* Define for Soc scratched reg used on ASTDP */
+#define AST_DP_PHY_SLEEP			BIT(4)
+#define AST_DP_VIDEO_ENABLE		BIT(0)
+
+#define AST_DP_POWER_ON			true
+#define AST_DP_POWER_OFF			false
+
+/*
+ * CRD1[b5]: DP MCU FW is executing
+ * CRDC[b0]: DP link success
+ * CRDF[b0]: DP HPD
+ * CRE5[b0]: Host reading EDID process is done
+ */
+#define ASTDP_MCU_FW_EXECUTING			BIT(5)
+#define ASTDP_LINK_SUCCESS				BIT(0)
+#define ASTDP_HPD						BIT(0)
+#define ASTDP_HOST_EDID_READ_DONE		BIT(0)
+#define ASTDP_HOST_EDID_READ_DONE_MASK	GENMASK(0, 0)
+
+/*
+ * CRB8[b1]: Enable VSYNC off
+ * CRB8[b0]: Enable HSYNC off
+ */
+#define AST_DPMS_VSYNC_OFF				BIT(1)
+#define AST_DPMS_HSYNC_OFF				BIT(0)
+
+/*
+ * CRDF[b4]: Mirror of AST_DP_VIDEO_ENABLE
+ * Precondition:	A. ~AST_DP_PHY_SLEEP  &&
+ *			B. DP_HPD &&
+ *			C. DP_LINK_SUCCESS
+ */
+#define ASTDP_MIRROR_VIDEO_ENABLE		BIT(4)
+
+#define ASTDP_EDID_READ_POINTER_MASK	GENMASK(7, 0)
+#define ASTDP_EDID_VALID_FLAG_MASK		GENMASK(0, 0)
+#define ASTDP_EDID_READ_DATA_MASK		GENMASK(7, 0)
+
+/*
+ * ASTDP setmode registers:
+ * CRE0[7:0]: MISC0 ((0x00: 18-bpp) or (0x20: 24-bpp)
+ * CRE1[7:0]: MISC1 (default: 0x00)
+ * CRE2[7:0]: video format index (0x00 ~ 0x20 or 0x40 ~ 0x50)
+ */
+#define ASTDP_MISC0_24bpp			BIT(5)
+#define ASTDP_MISC1				0
+#define ASTDP_AND_CLEAR_MASK		0x00
+
+/*
+ * ASTDP resoultion table:
+ * EX:	ASTDP_A_B_C:
+ *		A: Resolution
+ *		B: Refresh Rate
+ *		C: Misc information, such as CVT, Reduce Blanked
+ */
+#define ASTDP_640x480_60		0x00
+#define ASTDP_640x480_72		0x01
+#define ASTDP_640x480_75		0x02
+#define ASTDP_640x480_85		0x03
+#define ASTDP_800x600_56		0x04
+#define ASTDP_800x600_60		0x05
+#define ASTDP_800x600_72		0x06
+#define ASTDP_800x600_75		0x07
+#define ASTDP_800x600_85		0x08
+#define ASTDP_1024x768_60		0x09
+#define ASTDP_1024x768_70		0x0A
+#define ASTDP_1024x768_75		0x0B
+#define ASTDP_1024x768_85		0x0C
+#define ASTDP_1280x1024_60		0x0D
+#define ASTDP_1280x1024_75		0x0E
+#define ASTDP_1280x1024_85		0x0F
+#define ASTDP_1600x1200_60		0x10
+#define ASTDP_320x240_60		0x11
+#define ASTDP_400x300_60		0x12
+#define ASTDP_512x384_60		0x13
+#define ASTDP_1920x1200_60		0x14
+#define ASTDP_1920x1080_60		0x15
+#define ASTDP_1280x800_60		0x16
+#define ASTDP_1280x800_60_RB	0x17
+#define ASTDP_1440x900_60		0x18
+#define ASTDP_1440x900_60_RB	0x19
+#define ASTDP_1680x1050_60		0x1A
+#define ASTDP_1680x1050_60_RB	0x1B
+#define ASTDP_1600x900_60		0x1C
+#define ASTDP_1600x900_60_RB	0x1D
+#define ASTDP_1366x768_60		0x1E
+#define ASTDP_1152x864_75		0x1F
+
 int ast_mm_init(struct ast_private *ast);

 /* ast post */
@@ -381,4 +489,11 @@ void ast_init_3rdtx(struct drm_device *dev);
 /* ast_i2c.c */
 struct ast_i2c_chan *ast_i2c_create(struct drm_device *dev);

+/* aspeed DP */
+int ast_astdp_read_edid(struct drm_device *dev, u8 *ediddata);
+void ast_dp_launch(struct drm_device *dev, u8 bPower);
+void ast_dp_power_on_off(struct drm_device *dev, bool no);
+void ast_dp_set_on_off(struct drm_device *dev, bool no);
+void ast_dp_set_mode(struct drm_crtc *crtc, struct ast_vbios_mode_info *vbios_mode);
+
 #endif
diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index 22e9e2d3c..1113ee1cb 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -232,7 +232,7 @@ static int ast_detect_chip(struct drm_device *dev, bool *need_post)
 			ast->tx_chip_type = AST_TX_SIL164;
 	}

-	if ((ast->chip == AST2300) || (ast->chip == AST2400)) {
+	if ((ast->chip == AST2300) || (ast->chip == AST2400) || (ast->chip == AST2500)) {
 		/*
 		 * On AST2300 and 2400, look the configuration set by the SoC in
 		 * the SOC scratch register #1 bits 11:8 (interestingly marked
@@ -256,7 +256,8 @@ static int ast_detect_chip(struct drm_device *dev, bool *need_post)
 		case 0x0c:
 			ast->tx_chip_type = AST_TX_DP501;
 		}
-	}
+	} else if (ast->chip == AST2600)
+		ast_dp_launch(&ast->base, 0);

 	/* Print stuff for diagnostic purposes */
 	switch(ast->tx_chip_type) {
diff --git a/drivers/gpu/drm/ast/ast_mode.c b/drivers/gpu/drm/ast/ast_mode.c
index 45b56b39a..4728825b7 100644
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c
@@ -988,21 +988,41 @@ static int ast_cursor_plane_init(struct ast_private *ast)
 static void ast_crtc_dpms(struct drm_crtc *crtc, int mode)
 {
 	struct ast_private *ast = to_ast_private(crtc->dev);
+	u8 ch = AST_DPMS_VSYNC_OFF | AST_DPMS_HSYNC_OFF;

 	/* TODO: Maybe control display signal generation with
 	 *       Sync Enable (bit CR17.7).
 	 */
 	switch (mode) {
 	case DRM_MODE_DPMS_ON:
-	case DRM_MODE_DPMS_STANDBY:
-	case DRM_MODE_DPMS_SUSPEND:
+		ast_set_index_reg_mask(ast, AST_IO_SEQ_PORT,  0x01, 0xdf, 0);
+		ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb6, 0xfc, 0);
 		if (ast->tx_chip_type == AST_TX_DP501)
 			ast_set_dp501_video_output(crtc->dev, 1);
+
+		if (ast->tx_chip_type == AST_TX_ASTDP) {
+			ast_dp_power_on_off(crtc->dev, AST_DP_POWER_ON);
+			ast_wait_for_vretrace(ast);
+			ast_dp_set_on_off(crtc->dev, 1);
+		}
+
+		ast_crtc_load_lut(ast, crtc);
 		break;
+	case DRM_MODE_DPMS_STANDBY:
+	case DRM_MODE_DPMS_SUSPEND:
 	case DRM_MODE_DPMS_OFF:
+		ch = mode;
 		if (ast->tx_chip_type == AST_TX_DP501)
 			ast_set_dp501_video_output(crtc->dev, 0);
 		break;
+
+		if (ast->tx_chip_type == AST_TX_ASTDP) {
+			ast_dp_set_on_off(crtc->dev, 0);
+			ast_dp_power_on_off(crtc->dev, AST_DP_POWER_OFF);
+		}
+
+		ast_set_index_reg_mask(ast, AST_IO_SEQ_PORT,  0x01, 0xdf, 0x20);
+		ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xb6, 0xfc, ch);
 	}
 }

@@ -1027,7 +1047,7 @@ ast_crtc_helper_mode_valid(struct drm_crtc *crtc, const struct drm_display_mode

 		if ((ast->chip == AST2100) || (ast->chip == AST2200) ||
 		    (ast->chip == AST2300) || (ast->chip == AST2400) ||
-		    (ast->chip == AST2500)) {
+		    (ast->chip == AST2500) || (ast->chip == AST2600)) {
 			if ((mode->hdisplay == 1920) && (mode->vdisplay == 1080))
 				return MODE_OK;

@@ -1110,6 +1130,7 @@ ast_crtc_helper_atomic_flush(struct drm_crtc *crtc,
 	struct ast_private *ast = to_ast_private(crtc->dev);
 	struct ast_crtc_state *ast_crtc_state = to_ast_crtc_state(crtc_state);
 	struct ast_crtc_state *old_ast_crtc_state = to_ast_crtc_state(old_crtc_state);
+	struct ast_vbios_mode_info *vbios_mode_info = &ast_crtc_state->vbios_mode_info;

 	/*
 	 * The gamma LUT has to be reloaded after changing the primary
@@ -1117,6 +1138,10 @@ ast_crtc_helper_atomic_flush(struct drm_crtc *crtc,
 	 */
 	if (old_ast_crtc_state->format != ast_crtc_state->format)
 		ast_crtc_load_lut(ast, crtc);
+
+	//Set Aspeed Display-Port
+	if (ast->tx_chip_type == AST_TX_ASTDP)
+		ast_dp_set_mode(crtc, vbios_mode_info);
 }

 static void
@@ -1527,6 +1552,93 @@ static int ast_dp501_output_init(struct ast_private *ast)
 	return 0;
 }

+/*
+ * ASPEED Display-Port Connector
+ */
+
+static int ast_astdp_connector_helper_get_modes(struct drm_connector *connector)
+{
+	void *edid;
+
+	int succ;
+	int count;
+
+	edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
+	if (!edid)
+		goto err_drm_connector_update_edid_property;
+
+	succ = ast_astdp_read_edid(connector->dev, edid);
+	if (succ < 0)
+		goto err_kfree;
+
+	drm_connector_update_edid_property(connector, edid);
+	count = drm_add_edid_modes(connector, edid);
+	kfree(edid);
+
+	return count;
+
+err_kfree:
+	kfree(edid);
+err_drm_connector_update_edid_property:
+	drm_connector_update_edid_property(connector, NULL);
+	return 0;
+}
+
+static const struct drm_connector_helper_funcs ast_astdp_connector_helper_funcs = {
+	.get_modes = ast_astdp_connector_helper_get_modes,
+};
+
+static const struct drm_connector_funcs ast_astdp_connector_funcs = {
+	.reset = drm_atomic_helper_connector_reset,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = drm_connector_cleanup,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static int ast_astdp_connector_init(struct drm_device *dev, struct drm_connector *connector)
+{
+	int ret;
+
+	ret = drm_connector_init(dev, connector, &ast_astdp_connector_funcs,
+				 DRM_MODE_CONNECTOR_DisplayPort);
+	if (ret)
+		return ret;
+
+	drm_connector_helper_add(connector, &ast_astdp_connector_helper_funcs);
+
+	connector->interlace_allowed = 0;
+	connector->doublescan_allowed = 0;
+
+	connector->polled = DRM_CONNECTOR_POLL_CONNECT;
+
+	return 0;
+}
+
+static int ast_astdp_output_init(struct ast_private *ast)
+{
+	struct drm_device *dev = &ast->base;
+	struct drm_crtc *crtc = &ast->crtc;
+	struct drm_encoder *encoder = &ast->output.astdp.encoder;
+	struct drm_connector *connector = &ast->output.astdp.connector;
+	int ret;
+
+	ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_TMDS);
+	if (ret)
+		return ret;
+	encoder->possible_crtcs = drm_crtc_mask(crtc);
+
+	ret = ast_astdp_connector_init(dev, connector);
+	if (ret)
+		return ret;
+
+	ret = drm_connector_attach_encoder(connector, encoder);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
 /*
  * Mode config
  */
@@ -1563,7 +1675,8 @@ int ast_mode_config_init(struct ast_private *ast)
 	    ast->chip == AST2200 ||
 	    ast->chip == AST2300 ||
 	    ast->chip == AST2400 ||
-	    ast->chip == AST2500) {
+	    ast->chip == AST2500 ||
+	    ast->chip == AST2600) {
 		dev->mode_config.max_width = 1920;
 		dev->mode_config.max_height = 2048;
 	} else {
@@ -1594,6 +1707,9 @@ int ast_mode_config_init(struct ast_private *ast)
 	case AST_TX_DP501:
 		ret = ast_dp501_output_init(ast);
 		break;
+	case AST_TX_ASTDP:
+		ret = ast_astdp_output_init(ast);
+		break;
 	}
 	if (ret)
 		return ret;
diff --git a/drivers/gpu/drm/ast/ast_post.c b/drivers/gpu/drm/ast/ast_post.c
index b5d92f652..0aa9cf0fb 100644
--- a/drivers/gpu/drm/ast/ast_post.c
+++ b/drivers/gpu/drm/ast/ast_post.c
@@ -379,7 +379,9 @@ void ast_post_gpu(struct drm_device *dev)
 	ast_enable_mmio(dev);
 	ast_set_def_ext_reg(dev);

-	if (ast->config_mode == ast_use_p2a) {
+	if (ast->chip == AST2600) {
+		ast_dp_launch(dev, 1);
+	} else if (ast->config_mode == ast_use_p2a) {
 		if (ast->chip == AST2500)
 			ast_post_chip_2500(dev);
 		else if (ast->chip == AST2300 || ast->chip == AST2400)

base-commit: c54b39a565227538c52ead2349eb17d54aadd6f7
--
2.27.0

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