我们项目用到 SN65DSI86 mipi to eDP, 现在只有背光，无画面，color bar 也没有显示，需要排查哪些？帮忙指导下.
软件和原理图见下面：
VOID sn65dsi86_regInit(VOID)
{
sn65dsi86_write(SW_RST, 0x00);
sn65dsi86_write(CLK_REG_0A, 0x03);// REFCLK_FREQ/DPPLL_CLK_SRC
sn65dsi86_write(CLK_REG_0D, 0x00);//songer
sn65dsi86_write(DSI_REG_10, 0x26);//songer
sn65dsi86_write(DSI_REG_11, 0x00);//songer
sn65dsi86_write(DSI_REG_12, 0x4c);//songer --------..note CHA_DSI_CLK_RANGE 0x50 400 < 405
sn65dsi86_write(DSI_REG_13, 0x4c); //chanel B
sn65dsi86_write(VIDEO_REG_20, 0x80);//songer,the length in pixels of the active horizontal line for Channel A
sn65dsi86_write(VIDEO_REG_21, 0x07);//songer,the length in pixels of the active horizontal line for Channel A
sn65dsi86_write(VIDEO_REG_22, 0x00); //chanel B
sn65dsi86_write(VIDEO_REG_23, 0x00); //Chanel B
sn65dsi86_write(VIDEO_REG_24, 0x38);// the vertical display size in lines for Channel A
sn65dsi86_write(VIDEO_REG_25, 0x04);// the vertical display size in lines for Channel A
sn65dsi86_write(VIDEO_REG_2C, 0x13);// CHA_HSYNC_PULSE_WIDTH_LOW -------...note
sn65dsi86_write(VIDEO_REG_2D, 0x00);// CHA_HSYNC_POLARITY/CHA_HSYNC_PULSE_WIDTH_HIGH ------...note
sn65dsi86_write(VIDEO_REG_30, 0x08);// CHA_VSYNC_PULSE_WIDTH_LOW -----..note
sn65dsi86_write(VIDEO_REG_31, 0x00);//CHA_VSYNC_POLARITY/CHA_VSYNC_PULSE_WIDTH_HIGH ----...note
sn65dsi86_write(VIDEO_REG_34, 0x14);//CHA_HORIZONTAL_BACK_PORCH
sn65dsi86_write(VIDEO_REG_36, 0x0b);//CHA_VERTICAL_BACK_PORCH
sn65dsi86_write(VIDEO_REG_38, 0x1e);//CHA_HORIZONTAL_FRONT_PORCH
sn65dsi86_write(VIDEO_REG_3A, 0x0c);//CHA_VERTICAL_FRONT_PORCH
sn65dsi86_write(VIDEO_REG_3C, 0x10); // songer COLOR_BAR_EN-->1
sn65dsi86_write(VIDEO_REG_3D, 0x00); // songer
sn65dsi86_write(VIDEO_REG_3E, 0x00); // songer
sn65dsi86_write(DP_SPEC_REG_5B, 0x00); // songer
sn65dsi86_write(LK_TRAIN_REG_93, 0x34);//songer
sn65dsi86_write(LK_TRAIN_REG_94, 0xe0);//songer
sn65dsi86_write(DP_SPEC_REG_5C, 0x01); // songer
sn65dsi86_write(DP_SPEC_REG_5A, 0x05);// default 0x05, IDLE pattern enable
sn65dsi86_write(CLK_REG_0D, 0x01);//songer pll_enable
MDP_OSAL_DELAYMS(10);
sn65dsi86_DebugDumpReg(CLK_REG_0D);
sn65dsi86_write(I2C_OVER_AUX_REG_64, 0x01);
sn65dsi86_write(I2C_OVER_AUX_REG_74, 0x00);
sn65dsi86_write(I2C_OVER_AUX_REG_75, 0x01);
sn65dsi86_write(I2C_OVER_AUX_REG_76, 0x0A);
sn65dsi86_write(I2C_OVER_AUX_REG_77, 0x01);
sn65dsi86_write(I2C_OVER_AUX_REG_78, 0x81);
MDP_OSAL_DELAYMS(10);
sn65dsi86_write(LK_TRAIN_REG_96, 0x0a);// 01 --> 0a
MDP_OSAL_DELAYMS(20);
sn65dsi86_write(DP_SPEC_REG_5A, 0x05);//songer temp
}
