Re: [PATCH v3] drm/ast: Create the driver for ASPEED proprietory Display-Port

From: Thomas Zimmermann
Date: Wed Jan 12 2022 - 10:04:36 EST

Hi

Am 04.01.22 um 09:50 schrieb KuoHsiang Chou:
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.

Signed-off-by: KuoHsiang Chou <kuohsiang_chou@xxxxxxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
---
drivers/gpu/drm/ast/Makefile | 2 +-
drivers/gpu/drm/ast/ast_dp.c | 292 +++++++++++++++++++++++++++++++++
drivers/gpu/drm/ast/ast_drv.h | 127 ++++++++++++++
drivers/gpu/drm/ast/ast_main.c | 5 +-
drivers/gpu/drm/ast/ast_mode.c | 46 +++++-
drivers/gpu/drm/ast/ast_post.c | 4 +-
6 files changed, 468 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..1daa25d92
--- /dev/null
+++ b/drivers/gpu/drm/ast/ast_dp.c
@@ -0,0 +1,292 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2021, ASPEED Technology Inc.
+// Authors: KuoHsiang Chou <kuohsiang_chou@xxxxxxxxxxxxxx>
+
+#include <linux/firmware.h>
+#include <linux/delay.h>
+#include <drm/drm_print.h>
+#include "ast_drv.h"
+
+bool ast_dp_read_edid(struct drm_device *dev, u8 *ediddata)
+{
+ struct ast_private *ast = to_ast_private(dev);
+ u8 i = 0, j = 0;
+
+#ifdef DPControlPower

This define needs to go away. Here and in all other places. It's always enabled anyway. Either keep the enclosed code or remove it.

AFAIU, the DP chips needs to be pwered on to be used. So what exactly does this #ifdef protect?


+ u8 bDPState_Change = false;
+
+ // Check DP power off or not.
+ if (ast->ASTDP_State & AST_DP_PHY_SLEEP) {
+ // DP power on
+ ast_dp_PowerOnOff(dev, AST_DP_POWER_ON);
+ bDPState_Change = true;
+ }
+#endif

The TX chip should already be running when ast_dp_read_edid() runs. At least put it into the caller. More generally speaking, the modesetting callbacks should handle this somewhere.


+
+ /*
+ * 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))) {
+#ifdef DPControlPower
+ // Set back power off
+ if (bDPState_Change)
+ ast_dp_PowerOnOff(dev, AST_DP_POWER_OFF);
+#endif
+ return false;
+ }
+
+ 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,
+ (u8) ~ASTDP_EDID_READ_POINTER_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)) {
+ mdelay(j+1);

I don't understand 'mdelay(j + 1)'. Delays are getting longer with each retry?

+
+ 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_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE5,
+ (u8) ~ASTDP_HOST_EDID_READ_DONE_MASK,
+ ASTDP_HOST_EDID_READ_DONE);
+ return false;
+ }
+
+ j++;
+ if (j > 200) {
+ ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE5,
+ (u8) ~ASTDP_HOST_EDID_READ_DONE_MASK,
+ ASTDP_HOST_EDID_READ_DONE);
+ return false;

Rather than doing a cleanup here, jump out of the for loop (goto out;) and use the regular clean-up code. This would also reset the chip's power state on errors. The return value of this function would depend on the success or failure.

+ }
+ }
+
+ *(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);
+
+#ifdef DPControlPower
+ // Set back power off
+ if (bDPState_Change)
+ ast_dp_PowerOnOff(dev, AST_DP_POWER_OFF);
+#endif
+
+ return true;

Rather than returning a boolean value, it's better style to return 0 on success or a negative errno code on failure. If the register operations fail, returning -EIO might be appropriate.

+}
+
+/*
+ * Launch Aspeed DP
+ */
+bool 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;
+
+ // Fill
+ ast->tx_chip_type = AST_TX_NONE;

This needs to be cleared elsewhere. Right now it just interferes with other places that set this field.

Ideally, you'd have a test function that detects the TX chip and launch functions that starts the detected chip.

+
+ // Wait total count by different condition.
+ // This is a temp solution for DP check
+ 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;
+ }
+
+ return true;

There's no way this function fails, so no need for a return value. If there is a possible error, it should be returned as negative errno code.

+}
+
+#ifdef DPControlPower
+
+void ast_dp_PowerOnOff(struct drm_device *dev, u8 Mode)

We don't use CamelCase style. Rather call ths function ast_dp_power_on_off(). Same applies to all functions with CamelCase.

Instead of 'u8 Mode', 'bool on' seems appropriate.

+{
+ 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 (!Mode)
+ 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);
+
+ // Save ASTDP power state
+ ast->ASTDP_State = bE3;

Never hold full registers in the driver's state. Either read the register's value when you need it, or store some logical state (on/off/sleep, etc).

Chances are that ASTDP_State belongs into connector state anyway; instead of the struct ast_private.

+}
+
+#endif
+
+void ast_dp_SetOnOff(struct drm_device *dev, u8 Mode)

As far as I understand, ast_dp_PowerOnOff() is for the chip as a whole and this function only enables/disables the video signal?

Again, instead of 'u8 Mode' a 'bool on' seems appropriate.

CamelCase

+{
+ struct ast_private *ast = to_ast_private(dev);
+
+ // Video On/Off
+ ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE3, (u8) ~AST_DP_VIDEO_ENABLE, Mode);
+
+ // Save ASTDP power state
+ ast->ASTDP_State = Mode;
+
+ // 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)) {
+ Mode <<= 4;
+ while (ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xDF,
+ ASTDP_MIRROR_VIDEO_ENABLE) != Mode) {
+ // wait 1 ms
+ mdelay(1);
+ }
+ }
+}
+
+void ast_dp_SetOutput(struct drm_crtc *crtc, struct ast_vbios_mode_info *vbios_mode)

CamelCase

Maybe rater call it ast_dp_set_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, (u8) ~ASTDP_CLEAR_MASK,
+ ASTDP_MISC0_24bpp);
+ ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE1, (u8) ~ASTDP_CLEAR_MASK, ASTDP_MISC1);
+ ast_set_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xE2, (u8) ~ASTDP_CLEAR_MASK, ModeIdx);
+}
diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h
index 00bfa41ff..799828503 100644
--- a/drivers/gpu/drm/ast/ast_drv.h
+++ b/drivers/gpu/drm/ast/ast_drv.h
@@ -71,6 +71,7 @@ enum ast_tx_chip {
AST_TX_SIL164,
AST_TX_ITE66121,
AST_TX_DP501,
+ AST_TX_ASTDP,
};

#define AST_DRAM_512Mx16 0
@@ -175,6 +176,9 @@ struct ast_private {
u8 dp501_maxclk;
u8 *dp501_fw_addr;
const struct firmware *dp501_fw; /* dp501 fw */
+
+ // ASTDP
+ u8 ASTDP_State;
};

static inline struct ast_private *to_ast_private(struct drm_device *dev)
@@ -336,10 +340,123 @@ 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)
+
+#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)
+
+/*
+ * Display Transmittor Type:

'Transmitter'

+ */
+#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)

This duplicates the defines from just a few lines above.

+
+/*
+ * 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_CLEAR_MASK GENMASK(7, 0)
+
+/*
+ * 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 */
@@ -360,4 +477,14 @@ void ast_init_3rdtx(struct drm_device *dev);
/* ast_i2c.c */
struct ast_i2c_chan *ast_i2c_create(struct drm_device *dev);

+/* aspeed DP */
+#define DPControlPower
+bool ast_dp_read_edid(struct drm_device *dev, u8 *ediddata);
+bool ast_dp_launch(struct drm_device *dev, u8 bPower);
+#ifdef DPControlPower
+void ast_dp_PowerOnOff(struct drm_device *dev, u8 Mode);
+#endif
+void ast_dp_SetOnOff(struct drm_device *dev, u8 Mode);
+void ast_dp_SetOutput(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 79a361867..9f25fa2c8 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -230,7 +230,7 @@ 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
@@ -254,7 +254,8 @@ 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 44c2aafcb..1c7a57a03 100644
--- a/drivers/gpu/drm/ast/ast_mode.c
+++ b/drivers/gpu/drm/ast/ast_mode.c

Everything in this file needs an overhaul. All the CRTC and connector functions handle all TX chips. A better design would provide CRTC and conenctor for each TX chip.

I began to rework the modesetting mode in the patchset at


https://lore.kernel.org/dri-devel/20220111120058.10510-1-tzimmermann@xxxxxxx/T/#m9203552f7f87f18df530cb4a679ca2188fce85a9

You're welcome to comment and test.

But I don't have ast hardware with the dedicated TX chips, so refactoring goes slowly.

@@ -984,21 +984,45 @@ 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) {
+#ifdef DPControlPower
+ ast_dp_PowerOnOff(crtc->dev, AST_DP_POWER_ON);
+#endif

Just a general comment: DPMS is for signal generation. It seems like you'd want to power up the TX chip elsewhere in the code. But I cannot really point to a good location.

+ ast_wait_for_vretrace(ast);
+ ast_dp_SetOnOff(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_SetOnOff(crtc->dev, 0);
+#ifdef DPControlPower
+ ast_dp_PowerOnOff(crtc->dev, AST_DP_POWER_OFF);
+#endif
+ }
+
+ 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);
}
}

@@ -1041,6 +1065,7 @@ 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
@@ -1048,6 +1073,10 @@ 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_SetOutput(crtc, vbios_mode_info);
}

static void
@@ -1222,6 +1251,14 @@ static int ast_get_modes(struct drm_connector *connector)
ast->dp501_maxclk = ast_get_dp501_max_clk(connector->dev);
else
kfree(edid);
+ } else if (ast->tx_chip_type == AST_TX_ASTDP) {
+ edid = kmalloc(128, GFP_KERNEL);

There's EDID_LENGTH for the constant of 128.


Best regards
Thomas

+ if (!edid)
+ return -ENOMEM;
+
+ flags = ast_dp_read_edid(connector->dev, (u8 *)edid);
+ if (!flags)
+ kfree(edid);
}
if (!flags && ast_connector->i2c)
edid = drm_get_edid(connector, &ast_connector->i2c->adapter);
@@ -1256,7 +1293,7 @@ static enum drm_mode_status ast_mode_valid(struct drm_connector *connector,

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;

@@ -1378,7 +1415,8 @@ 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 {
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: cb6846fbb83b574c85c2a80211b402a6347b60b1
--
2.27.0


--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

Attachment: OpenPGP_signature
Description: OpenPGP digital signature