rk3128中更改设备树,使用新的MIPI屏幕JD8952 |
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rk3128中更改设备树,使用新的MIPI屏幕JD8952
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公司对rk3128的芯片重新适配屏幕,所以我们要重新写设备树 Menuconfig 配置要调用到 MIPI 驱动需要在 menuconfig 里面进行配置 mipi host 配置、屏电源控制配置、屏初始化序列三部分是在 drivers/video/rockchip/screen/lcd_mipi.c 中解析的，最后的屏参是在 drivers/video/of_display_timing.c 中解析。因为该部分信息 mipi/edp/lvds/hdmi 之 类显示设备都存在，所以在统一的地方进行解析。 mipi host 配置 disp_mipi_init: mipi_dsi_init{ compatible = "rockchip,mipi_dsi_init"; rockchip,screen_init = ; rockchip,dsi_lane = ; rockchip,dsi_hs_clk = ; rockchip,mipi_dsi_num = ; };screen_init : 表示屏是否需要初始化，如果需要则置为 1. dsi_lane : mipi 数据传输需要几条数据 lane,手上这个屏幕就一条数据 dsi_hs_clk : 屏 ddr clk，表示一条数据 lane 的传输速率，单位为 Mbits/s。有个大概 的计算公式：100+H_totalV_totalfps38/lanes。 所以 H_total = 240 V_total=240 fps=60(根据厂家给的单片机) 在最后厂商说100来左右 那就160 mipi_dsi_num ： 单 mipi 还是双 mipi 屏电源控制配置在之前上电后背光已经能正常亮,所以这个暂时不用调整 屏初始化序列这个就需要问厂商要一份单片机初始化代码,根据把他改成RK3128中MIPI格式 screen-type ： 屏幕类型，对于 mipi 屏来说有两种选择：单 mipi（SCREEN_MIPI）； 双 mipi（SCREEN_DUAL_MIPI）； lvds-format ： lvds 数据格式。对于 mipi 来说是无效参数，不用配置 out-face ： 屏幕接线格式,include/dt-bindings/rkfb/rk_fb.h 中定义。 Hactive ： 水平有效像素 Vactive : 垂直有效像素 hback-porch/hfront-porch/hsync-len : 水平同步信号 vback-porch/vfront-porch/vsync-len : 垂直同步信号 hsync-active 、 vsync-active 、 de-active 、 pixelclk-active ： 分 别 为 hync, vsync,DEN,dclk 的极性控制。置 1 将对极性进行翻转。 swap-rb、swap-rg、swap-gb : 设 1 将对对应的颜色进行翻转。 最后整个屏幕的设备树lcd-480X800-mipi0.dtsi 名字是这个名字,因为在总设备树里导入了它 / { disp_mipi_init: mipi_dsi_init{ compatible = "rockchip,mipi_dsi_init"; rockchip,screen_init = ; rockchip,dsi_lane = ; rockchip,dsi_hs_clk = ; rockchip,mipi_dsi_num = ; }; disp_mipi_power_ctr: mipi_power_ctr { compatible = "rockchip,mipi_power_ctr"; mipi_lcd_rst:mipi_lcd_rst{ compatible = "rockchip,lcd_rst"; rockchip,gpios = ; rockchip,delay = ; };/* mipi_lcd_en:mipi_lcd_en { compatible = "rockchip,lcd_en"; rockchip,gpios = ; rockchip,delay = ; };*/ }; disp_mipi_init_cmds: screen-on-cmds { rockchip,cmd_debug = ; compatible = "rockchip,screen-on-cmds"; rockchip,on-cmds1 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds2 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds3 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds4 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds5 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds6 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds7 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds8 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds9 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds10 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmd11 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds12 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds13 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds14 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds15 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds16 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds17 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds18 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds19 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds20 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds21 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds22 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds23 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds24 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds25 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds26 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; rockchip,on-cmds27 { compatible = "rockchip,on-cmds"; rockchip,cmd_type = ; rockchip,dsi_id = ; rockchip,cmd = ; rockchip,cmd_delay = ; }; }; disp_timings: display-timings { native-mode = ; compatible = "rockchip,display-timings"; timing0: timing0 { screen-type = ; lvds-format = ; out-face = ; clock-frequency = ; hactive = ; vactive = ; hback-porch = ; hfront-porch = ; hsync-len = ; vback-porch = ; vfront-porch = ; vsync-len = ; hsync-active = ; vsync-active = ; de-active = ; pixelclk-active = ; swap-rb = ; swap-rg = ; swap-gb = ; }; }; }; |
关键的是cmd 一条命令（如 0x05/0x15/0x39）+命令+参数 0x05 : 后面只有一个参数 0x15 : 后面有两个参数 0x39 : 两个参数以上
clock-frequency ： dclk 频率，单位为 HZ，6000000 这个地方设置错了,根据单片机设置成了60000000,还是要自己根据公式算才正确,不然会花屏【本文地址】
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