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:~#











