f133 tina4.0 sdk,发现一个很奇怪的现象，大佬们知道的帮忙解答一下，非常感谢

wyljkl LV 7

发现我把uboot2018的配置文件这个CONFIG_BOOT_GUI选上，内核部分disp部分直接不生效，取消掉配置它就生效了。好奇怪，uboot部分的显示跟内核会有冲突吗？

WhycanService LV 8

为了不闪屏，kernel发现uboot初始化过了，不再另外初始化。

wyljkl LV 7

@whycanservice
但是内核部分显示部分没跑，屏直接灭了。

柚木鉉 LV 9

检查是不是只配置了uboot的屏幕，内核的没有配置

wyljkl LV 7

@yuzukitsuru 你好，配置了，我把uboot的显示部分取消掉，内核部分就能正常初始化，显示正常

xiaobai2458 LV 2

@wyljkl 你好，使用的T113也遇到同样问题，这个最后定位哪个原因？

chengwei_peng LV 6

是不是提供一下开机过程的完整log，让大家一起看看呢？

xiaobai2458 LV 2

@xiaobai2458
我这排除此问题原因有两个：
1、kernel dts 配置fb0_width被屏蔽了，code拿不到会失败return。
2、kernel dts 中配置了lcd_gpio_0和lcd_gpio_1用于mipi的设备的供电和reset功能，应交的active状态不正确，导致panel init读取这个引脚默认状态后把供电拉低。mipi屏相当于被断电了，但是背光有点。

wyljkl LV 7

配置使能uboot开屏logo.txt

单纯配置kernel.txt
这是启动logo，配置了uoot的开屏，kernel的disp初始化开屏流程不一样，内核部分没有走LCD_open_flow这个流程了

budbool LV 9

@wyljkl 这个文件似乎有点问题，log可以直接复制上来的

wyljkl LV 7

@xiaobai2458 在 f133 tina4.0 sdk,发现一个很奇怪的现象，大佬们知道的帮忙解答一下，非常感谢中说：

@xiaobai2458
我这排除此问题原因有两个：
1、kernel dts 配置fb0_width被屏蔽了，code拿不到会失败return。
2、kernel dts 中配置了lcd_gpio_0和lcd_gpio_1用于mipi的设备的供电和reset功能，应交的active状态不正确，导致panel init读取这个引脚默认状态后把供电拉低。mipi屏相当于被断电了，但是背光有点。

你好，问题解决了吗？我看配置了uboot开屏，直接不走LCD_open_flow这个流程来初始化屏幕了

wyljkl LV 7

@wyljkl
这是单独配置kernel:
0.364295] io scheduler mq-deadline registered
[ 0.364313] io scheduler kyber registered
[ 0.365732] [DISP]disp_module_init
[ 0.366698] disp 5000000.disp: Adding to iommu group 0
[ 0.367635] [DISP] parser_disp_init_para,line:1407:
[ 0.367641] of_property_read fb0_width fail
[ 0.415312] drivers/video/fbdev/sunxi/disp2/disp/lcd/K080_IM2HYL802R_800X1280.c 101 LCD_cfg_panel_info

[    0.415375] display_fb_request,fb_id:0
[    0.427563] [DISP] Fb_copy_boot_fb,line:1443:
[    0.427569] no boot_fb0
[    0.428177] drivers/video/fbdev/sunxi/disp2/disp/de/disp_lcd.c 2093 disp_lcd_enable
[    0.428249] disp_al_manager_apply ouput_type:0
[    0.428698] [DISP] lcd_clk_config,line:774:
[    0.428716] disp 0, clk: pll(312000000),clk(312000000),dclk(52000000) dsi_rate(52000000)
[    0.428716]      clk real:pll(312000000),clk(312000000),dclk(78000000) dsi_rate(150000000)
[    0.429498] drivers/video/fbdev/sunxi/disp2/disp/de/disp_lcd.c 2179 disp_lcd_enable
[    0.429513] drivers/video/fbdev/sunxi/disp2/disp/lcd/K080_IM2HYL802R_800X1280.c 158 LCD_open_flow
[    0.429528] drivers/video/fbdev/sunxi/disp2/disp/lcd/K080_IM2HYL802R_800X1280.c 180 LCD_power_on
[    0.430350] [DISP]disp_module_init finish
[    0.431778] sunxi_sid_init()563 - insmod ok
[    0.432619] pwm-regulator: supplied by regulator-dummy
[    0.436563] sun8iw20-pinctrl 2000000.pinctrl: 2000000.pinctrl supply vcc-pe not found, using dummy regulator
[    0.437093] uart uart0: uart0 supply uart not found, using dummy regulator
[    0.437780] uart0: ttyS0 at MMIO 0x2500000 (irq = 18, base_baud = 1500000) is a SUNXI
[    0.437815] sw_console_setup()1807 - console setup baud 115200 parity n bits 8, flow n
[    0.730743] sun8iw20-pinctrl 2000000.pinctrl: 2000000.pinctrl supply vcc-pd not found, using dummy regulator
[    0.839416] drivers/video/fbdev/sunxi/disp2/disp/lcd/K080_IM2HYL802R_800X1280.c 280 LCD_panel_init
[    1.182590] printk: console [ttyS0] enabled
[    1.188592] sun8iw20-pinctrl 2000000.pinctrl: 2000000.pinctrl supply vcc-pg not found, using dummy regulator
[    1.200417] uart uart1: uart1 supply uart not found, using dummy regulator
[    1.208798] uart1: ttyS1 at MMIO 0x2500400 (irq = 19, base_baud = 1500000) is a SUNXI
[    1.219206] uart uart3: uart3 supply uart not found, using dummy regulator
[    1.227924] uart3: ttyS3 at MMIO 0x2500c00 (irq = 21, base_baud = 1500000) is a SUNXI
[    1.238157] uart uart4: uart4 supply uart not found, using dummy regulator
[    1.246772] uart4: ttyS4 at MMIO 0x2501000 (irq = 22, base_baud = 1500000) is a SUNXI
[    1.258032] misc dump reg init
[    1.264268] [ADDR_MGT] addr_mgt_probe: module version: v1.0.11
[    1.273037] [ADDR_MGT] addr_mgt_probe: success.
[    1.280527] sunxi-spinand: AW SPINand MTD Layer Version: 2.3 20211223
[    1.288788] sunxi-spinand-phy: AW SPINand Phy Layer Version: 1.10 20200306
[    1.296631] sunxi-spinand-phy: not detect any munufacture from id table
[    1.304248] sunxi-spinand-phy: get spi-nand Model from fdt fail
[    1.310934] sunxi-spinand-phy: get phy info from fdt fail
[    1.316947] sunxi-spinand-phy: not detect munufacture from fdt
[    1.323792] sunxi-spinand-phy: detect munufacture from id table: FM
[    1.330853] drivers/video/fbdev/sunxi/disp2/disp/lcd/K080_IM2HYL802R_800X1280.c 225 LCD_bl_open
[    1.340641] sunxi-spinand-phy: detect spinand id: 7f7fe4a1 ffffffff
[    1.348004] sunxi-spinand-phy: ========== arch info ==========
[    1.354535] sunxi-spinand-phy: Model:               FM25S01A
[    1.360891] sunxi-spinand-phy: Munufacture:         FM
[    1.366613] sunxi-spinand-phy

/***************************************************************/
配置了uboot开屏：

[    0.365923] [DISP]disp_module_init
[    0.366900] disp 5000000.disp: Adding to iommu group 0
[    0.367761] [DISP] parser_disp_init_para,line:1407:
[    0.367767] of_property_read fb0_width fail
[    0.367794] [DISP] disp_init,line:2331:
[    0.367800] smooth display screen:0 type:1 mode:4
[    0.416425] drivers/video/fbdev/sunxi/disp2/disp/lcd/K080_IM2HYL802R_800X1280.c 101 LCD_cfg_panel_info
[    0.416488] display_fb_request,fb_id:0
[    0.430910] Freeing logo buffer memory: 1500K
[    0.431528] drivers/video/fbdev/sunxi/disp2/disp/de/disp_lcd.c 2287 disp_lcd_sw_enable
[    0.431599] disp_al_manager_apply ouput_type:1
[    0.431742] [DISP] lcd_clk_config,line:774:
[    0.431760] disp 0, clk: pll(312000000),clk(312000000),dclk(52000000) dsi_rate(52000000)
[    0.431760]      clk real:pll(312000000),clk(312000000),dclk(78000000) dsi_rate(150000000)
[    0.432130] sun8iw20-pinctrl 2000000.pinctrl: 2000000.pinctrl supply vcc-pd not found, using dummy regulator
[    0.433274] [DISP]disp_module_init finish
[    0.434731] sunxi_sid_init()563 - insmod ok
[    0.435576] pwm-regulator: supplied by regulator-dummy
[    0.439564] sun8iw20-pinctrl 2000000.pinctrl: 2000000.pinctrl supply vcc-pe not found, using dummy regulator
[    0.440119] uart uart0: uart0 supply uart not found, using dummy regulator
[    0.441108] uart0: ttyS0 at MMIO 0x2500000 (irq = 18, base_baud = 1500000) is a SUNXI
[    0.441143] sw_console_setup()1807 - console setup baud 115200 parity n bits 8, flow n
[    1.171629] printk: console [ttyS0] enabled
[    1.177628] sun8iw20-pinctrl 2000000.pinctrl: 2000000.pinctrl supply vcc-pg not found, using dummy regulator
[    1.189533] uart uart1: uart1 supply uart not found, using dummy regulator
[    1.197924] uart1: ttyS1 at MMIO 0x2500400 (irq = 19, base_baud = 1500000) is a SUNXI
[    1.208418] uart uart3: uart3 supply uart not found, using dummy regulator
[    1.217228] uart3: ttyS3 at MMIO 0x2500c00 (irq = 21, base_baud = 1500000) is a SUNXI
[    1.227619] uart uart4: uart4 supply uart not found, using dummy regulator
[    1.236266] uart4: ttyS4 at MMIO 0x2501000 (irq = 22, base_baud = 1500000) is a SUNXI
[    1.247411] misc dump reg init

anruliu LV 6

@wyljkl uboot开屏后，kernel不会再走开屏流程，只会保存一些状态，因为uboot已经开过屏了，如果uboot开屏后，kernel初始化disp阶段屏黑了，首先可以确定背光是否存在，到内核后能否显示colorbar,还有如上面说的lcd_gpio_0和lcd_gpio_1默认电平是否配置为高电平。

内核想要重新初始化屏，可以单独休眠唤醒lcd测试下能否恢复显示

mount -t debugfs none /sys/kernel/debug
cd /sys/kernel/debug/dispdbg
//休眠
echo suspend > command; echo disp0 > name; echo 1 > start
//唤醒
echo resume > command; echo disp0 > name; echo 1 > start

// colorbar彩条
echo 1 > /sys/class/disp/disp/attr/colorbar

wyljkl LV 7

@anruliu 在 f133 tina4.0 sdk,发现一个很奇怪的现象，大佬们知道的帮忙解答一下，非常感谢中说：

echo 1 > /sys/class/disp/disp/attr/colorbar

你好，配置了uboot开屏后，首先显示开机logo，然后内核disp初始化的时候背光是有的，但是不能正常显示了，刚才按照你上面提供的休眠唤醒后，屏可以正常显示。

这样的情况怎么去解决？能否提供个思路，我有个疑问，按照现在这个流程来走，uboot到kernel，uboot进行的mipi-dsi的屏指令初始化后，到内核部分屏的状态看现象貌似不能保存下来，还得重新初始化。

anruliu LV 6

@wyljkl 用示波器量下lcd各个脚，如reset是否跌落，电源是否有变化

wyljkl LV 7

@anruliu
刚才测量了下，uboot初始完后，reset脚和lcd_en使能脚直接变低了，没有保持高电平的状态。

wyljkl LV 7

@anruliu 不过pwm使能的背光一直是处于使能状态

anruliu LV 6

@wyljkl 在 f133 tina4.0 sdk,发现一个很奇怪的现象，大佬们知道的帮忙解答一下，非常感谢中说：

reset脚和lcd_en

上面说过了，dts中reset脚和lcd_en的默认电平是不是配置为低电平了？因为内核disp驱动初始化的时候会获取gpio并设置默认电平。

wyljkl LV 7

@anruliu 默认配置的是高电平：

anruliu LV 6

@wyljkl 检查dts其他地方有没有复用这些gpio

wyljkl LV 7

@wyljkl
我找到问题了，这个引脚的配置不能这样配置，改成这样就可以了，感谢各位大佬！