主题中讨论的其他器件: AB15
工具/软件:
MIPI-DSI 已连接到 mipi 屏幕、但当前未显示该屏幕。 
请注意 dsi_p_clk 不速率、为什么会这样?如何对问题进行故障排除? 请提供指南。 

使用命令“modetest -M tidss““cat /sys/kernel/debug/dri/30200000.dss/state “"kmsprint"查看“查看以下“以下内容:
root@am62lxx-evm:~# kmsprint 
[  984.281069] mipi rad panel get mode 
Connector 0 (41) DSI-1 (connected)
  Encoder 0 (40) NONE
    Crtc 0 (39) 1200x1920@58.53 156.000 1200/80/24/60/- 1920/20/4/10/- 59 (58.53) 0xa 0x48
      Plane 0 (32) fb-id: 43 (crtcs: 0) 0,0 1200x1920 -> 0,0 1200x1920 (AR12 AB12 RA12 RG16 BG16 AR15 AB15 AR24 AB24 RA24 BA24 RG24 BG24 AR30 AB30 XR12 XB12 RX12 XR15 XB15 XR24 XB24 RX24 BX24 XR30 XB30 YUYV UYVY NV12)
        FB 43 1200x1920
root@am62lxx-evm:~# 
root@am62lxx-evm:~# 
root@am62lxx-evm:~# 
root@am62lxx-evm:~# modetest -M tidss
[ 1015.324690] mipi rad panel get mode 
Encoders:
id	crtc	type	possible crtcs	possible clones	
40	39	none	0x00000001	0x00000001
Connectors:
id	encoder	status		name		size (mm)	modes	encoders
41	40	connected	DSI-1          	135x216		1	40
  modes:
	index name refresh (Hz) hdisp hss hse htot vdisp vss vse vtot
  #0 1200x1920 58.53 1200 1280 1304 1364 1920 1940 1944 1954 156000 flags: nhsync, nvsync; type: preferred, driver
  props:
	1 EDID:
		flags: immutable blob
		blobs:
		value:
	2 DPMS:
		flags: enum
		enums: On=0 Standby=1 Suspend=2 Off=3
		value: 0
	5 link-status:
		flags: enum
		enums: Good=0 Bad=1
		value: 0
	6 non-desktop:
		flags: immutable range
		values: 0 1
		value: 0
	4 TILE:
		flags: immutable blob
		blobs:
		value:
	42 panel orientation:
		flags: immutable enum
		enums: Normal=0 Upside Down=1 Left Side Up=2 Right Side Up=3
		value: 0
CRTCs:
id	fb	pos	size
39	43	(0,0)	(1200x1920)
  #0 1200x1920 58.53 1200 1280 1304 1364 1920 1940 1944 1954 156000 flags: nhsync, nvsync; type: preferred, driver
  props:
	24 VRR_ENABLED:
		flags: range
		values: 0 1
		value: 0
	27 CTM:
		flags: blob
		blobs:
		value:
	28 GAMMA_LUT:
		flags: blob
		blobs:
		value:
	29 GAMMA_LUT_SIZE:
		flags: immutable range
		values: 0 4294967295
		value: 256
Planes:
id	crtc	fb	CRTC x,y	x,y	gamma size	possible crtcs
32	39	43	0,0		0,0	0       	0x00000001
  formats: AR12 AB12 RA12 RG16 BG16 AR15 AB15 AR24 AB24 RA24 BA24 RG24 BG24 AR30 AB30 XR12 XB12 RX12 XR15 XB15 XR24 XB24 RX24 BX24 XR30 XB30 YUYV UYVY NV12
  props:
	8 type:
		flags: immutable enum
		enums: Overlay=0 Primary=1 Cursor=2
		value: 1
	30 IN_FORMATS:
		flags: immutable blob
		blobs:
		value:
			01000000000000001d00000018000000
			01000000900000004152313241423132
			52413132524731364247313641523135
			41423135415232344142323452413234
			42413234524732344247323441523330
			41423330585231325842313252583132
			58523135584231355852323458423234
			52583234425832345852333058423330
			59555956555956594e56313200000000
			ffffff1f000000000000000000000000
			0000000000000000
		in_formats blob decoded:
			 AR12:  LINEAR(0x0)
			 AB12:  LINEAR(0x0)
			 RA12:  LINEAR(0x0)
			 RG16:  LINEAR(0x0)
			 BG16:  LINEAR(0x0)
			 AR15:  LINEAR(0x0)
			 AB15:  LINEAR(0x0)
			 AR24:  LINEAR(0x0)
			 AB24:  LINEAR(0x0)
			 RA24:  LINEAR(0x0)
			 BA24:  LINEAR(0x0)
			 RG24:  LINEAR(0x0)
			 BG24:  LINEAR(0x0)
			 AR30:  LINEAR(0x0)
			 AB30:  LINEAR(0x0)
			 XR12:  LINEAR(0x0)
			 XB12:  LINEAR(0x0)
			 RX12:  LINEAR(0x0)
			 XR15:  LINEAR(0x0)
			 XB15:  LINEAR(0x0)
			 XR24:  LINEAR(0x0)
			 XB24:  LINEAR(0x0)
			 RX24:  LINEAR(0x0)
			 BX24:  LINEAR(0x0)
			 XR30:  LINEAR(0x0)
			 XB30:  LINEAR(0x0)
			 YUYV:  LINEAR(0x0)
			 UYVY:  LINEAR(0x0)
			 NV12:  LINEAR(0x0)
	34 zpos:
		flags: range
		values: 0 0
		value: 0
	35 COLOR_ENCODING:
		flags: enum
		enums: ITU-R BT.601 YCbCr=0 ITU-R BT.709 YCbCr=1
		value: 0
	36 COLOR_RANGE:
		flags: enum
		enums: YCbCr limited range=0 YCbCr full range=1
		value: 1
	37 alpha:
		flags: range
		values: 0 65535
		value: 65535
	38 pixel blend mode:
		flags: enum
		enums: Pre-multiplied=0 Coverage=1
		value: 0
Frame buffers:
id	size	pitch
root@am62lxx-evm:~# 
root@am62lxx-evm:~# 
root@am62lxx-evm:~# 
root@am62lxx-evm:~# cat /sys/kernel/debug/dri/30200000.dss/state
plane[32]: plane-0
	crtc=crtc-0
	fb=43
		allocated by = [fbcon]
		refcount=2
		format=XR24 little-endian (0x34325258)
		modifier=0x0
		size=1200x1920
		layers:
			size[0]=1200x1920
			pitch[0]=4800
			offset[0]=0
			obj[0]:
				name=0
				refcount=2
				start=00100000
				size=9216000
				imported=no
				dma_addr=0x00000000bcf00000
				vaddr=000000009718aacd
	crtc-pos=1200x1920+0+0
	src-pos=1200.000000x1920.000000+0.000000+0.000000
	rotation=1
	normalized-zpos=0
	color-encoding=ITU-R BT.601 YCbCr
	color-range=YCbCr full range
	color_mgmt_changed=0
crtc[39]: crtc-0
	enable=1
	active=1
	self_refresh_active=0
	planes_changed=1
	mode_changed=0
	active_changed=0
	connectors_changed=0
	color_mgmt_changed=0
	plane_mask=1
	connector_mask=1
	encoder_mask=1
	mode: "1200x1920": 59 156000 1200 1280 1304 1364 1920 1940 1944 1954 0x48 0xa
connector[41]: DSI-1
	crtc=crtc-0
	self_refresh_aware=0
	max_requested_bpc=0
	colorspace=Default
root@am62lxx-evm:~# 
root@am62lxx-evm:~# 
								 
				 
		 
					 
				




