MY DISP DEBUG SOP

REVISION HISTORY

Revision No.
Description
 Date
1.00
  • Initial release
    		•  2024.6.17
    1.01
  • Remove CMDQ timeout section
    		•  2024.12.04

    1. Introduction

    This document aims to introduce how to conduct preliminary troubleshooting when encountering MI DISP-related issues, quickly locate the problem, and determine what information needs to be provided to RD for analysis if it is confirmed to be a Sigmastar SDK issue.

    2.1 No Display on Screen (Black Screen)

    Debug Process:

    Process Confirmation Method Exit Conditions Next Step Information to Provide Related FAQs
    A Cross-test to confirm if the screen is normal Exit Condition 1: Screen abnormal;
    Exit Condition 2: Screen normal     		Exit Condition 1: Please seek assistance from the customer/screen manufacturer;
    Exit Condition 2: B
    B Confirm backlight is turned on Exit Condition 1: Backlight not on;
    Exit Condition 2: Backlight is on     		Exit Condition 1: Please seek assistance from the customer/CAE;
    Exit Condition 2: C
    C 1. Confirm padmux is set via padmux.dtsi: see the PADMUX conflict check in `Gpio_DebugSop`
    2. Refer to tmux table to read registers:
    TTL: riu_r 103c 6c;
    BT656: riu_r 103c 72;
    MIPITX-Dsi: riu_r 103c 64;
    sRGB: riu_r 103c 69;
    MCU(i8080): riu_r 103c 5f;
    		 Exit Condition 1: Incorrect padmux setting;
    Exit Condition 2: Correct padmux setting     		Exit Condition 1: Please seek assistance from the customer/CAE;
    Exit Condition 2: D
    D Confirm if M/L swap is configured correctly; if it is a mipidsi/lvds panel, additionally confirm if each data lane swap and P/N swap are configured correctly Exit Condition 1: Data lane configuration error;
    Exit Condition 2: Data lane configuration correct     		Exit Condition 1: Please seek assistance from the customer/CAE;
    Exit Condition 2: E
    E Refer to the datasheet to confirm if there is a power-on sequence; if so, measure the waveform to confirm it meets specifications Exit Condition 1: Power-on timing does not meet specifications;
    Exit Condition 2: Power-on timing meets specifications     		Exit Condition 1: Please seek assistance from the customer/screen manufacturer;
    Exit Condition 2: F
    F Refer to the datasheet to confirm if there is an initial sequence; if so, confirm that the application process has been added and capture the waveform to confirm it has been executed correctly Exit Condition 1: Initialization timing not executed correctly;
    Exit Condition 2: Initialization timing executed correctly     		Exit Condition 1: Please seek assistance from the customer/screen manufacturer;
    Exit Condition 2: G
    G Use an oscilloscope or logic analyzer to measure signals and confirm clock frequency; CAE assistance can be requested Exit Condition 1: Waveform abnormal;
    Exit Condition 2: Waveform correct     		Exit Condition 1: Please seek CAE assistance;
    Exit Condition 2: H
    H Confirm patterngen and force color
    1. Set patterngen: riu_w 1150 7 e
    2. Set force color: ./pcupid_red.sh // Red
    		Exit Condition 1: No display or abnormal display;
    Exit Condition 2: Display color bars or pure red     		Exit Condition 1: Please execute step J and inform the disp owner;
    Exit Condition 2: I
    I Fixed screen confirmation:
    echo stopgetbuff 0 0 ON > /proc/mi_modules/mi_disp/mi_disp0
    		 Exit Condition 1: Display screen;
    Exit Condition 2: No display     		Exit Condition 1: Please seek assistance from the disp upstream owner;
    Exit Condition 2: J
    J Dump information for Disp owner analysis:
    1, ./pcupid_mhal_disp_reg.sh [log_file] [dump_cnt]
    2, cat /proc/mi_modules/mi_disp/mi_disp0
    		 NA NA

    2.2 Screen Displays Artifacts or Flickering

    Debug Process:

    Process Confirmation Method Exit Conditions Next Step Information to Provide Related FAQs
    A Fixed screen confirmation:
    echo stopgetbuff 0 0 ON > /proc/mi_modules/mi_disp/mi_disp0
    		 Exit Condition 1: Screen normal without flickering or artifacts;
    Exit Condition 2: Screen flickering or artifacts     		Exit Condition 1: Please seek assistance from the disp upstream owner;
    Exit Condition 2: B
    B Dump Buf confirmation:
    echo dumpframe 0 0 [path] > /proc/mi_modules/mi_disp/mi_disp0
    		 Exit Condition 1: Image abnormal;
    Exit Condition 2: Image normal     		Exit Condition 1: Please seek assistance from the disp upstream owner;
    Exit Condition 2: C
    C Refer to the datasheet to confirm screen parameter information, including pad driving, data format mode, H/V total/bp/fp, etc. Exit Condition 1: Screen parameter configuration incorrect;
    Exit Condition 2: Screen parameter configuration normal     		Exit Condition 1: Please seek assistance from the screen manufacturer/disp owner;
    Exit Condition 2: D
    D Confirm patterngen and force color
    1. Set patterngen: riu_w 1150 7 e
    2. Set force color: ./pcupid_red.sh // Red
    		Exit Condition 1: Display abnormal;
    Exit Condition 2: Display normal     		Exit Condition 1: Please seek assistance from the disp owner;
    Exit Condition 2: E
    E Dump MIU BW information confirmation:
    cat /sys/devices/system/miu/miu0/bw
    		 Exit Condition 1: Insufficient BW;
    Exit Condition 2: Sufficient BW     		Exit Condition 1: Please seek assistance from the MIU owner;
    Exit Condition 2: F
    F Dump information for Disp owner analysis:
    1, ./pcupid_mhal_disp_reg.sh [log_file] [dump_cnt]
    2, cat /proc/mi_modules/mi_disp/mi_disp0
    		 NA NA

    2.3 Screen Displays Color Abnormalities

    Debug Process:

    Process Confirmation Method Exit Conditions Next Step Information to Provide Related FAQs
    A Force color single color confirmation:
    1, ./pcupid_red.sh // Red
    2, ./pcupid_green.sh // Green
    3, ./pcupid_blue.sh // Blue
    		Exit Condition 1: Color display abnormal;
    Exit Condition 2: Color display normal     		Exit Condition 1: B;
    Exit Condition 2: C
    B RGB swap confirmation:
    Confirm if m_ucPanelSwapChnR, m_ucPanelSwapChnG, m_ucPanelSwapChnB, m_ucPanelSwapRgbML in screen parameters are configured correctly with HW information; CAE assistance can be requested
    		Exit Condition 1: Configuration error;
    Exit Condition 2: Configuration correct     		Exit Condition 1: Please seek CAE assistance;
    Exit Condition 2: D
    C Dump Buf confirmation:
    echo dumpframe 0 0 [path] > /proc/mi_modules/mi_disp/mi_disp0
    		 Exit Condition 1: Image abnormal;
    Exit Condition 2: Image normal     		Exit Condition 1: Please seek assistance from the disp upstream owner;
    Exit Condition 2: D
    D Dump information for Disp owner analysis:
    1, ./pcupid_mhal_disp_reg.sh [log_file] [dump_cnt]
    2, cat /proc/mi_modules/mi_disp/mi_disp0
    		 NA NA

    3.1 Insufficient Disp Frame Rate

    Debug Process:

    Process Confirmation Method Exit Conditions Next Step Information to Provide Related FAQs
    A Cat debug information:
    cat /proc/mi_modules/mi_disp/mi_disp0;
    Confirm if IPS (HW frame rate) is normal; if IPS does not meet expectations, please confirm if H_total/V_total/DCLK/FPS in screen parameters are configured correctly; generally DCLK=H_total*V_total*fps
    		 Exit Condition 1: Screen parameters incorrect;
    Exit Condition 2: IPS meets expectations, but FPS does not meet expectations     		Exit Condition 1: Correct screen parameters;
    Exit Condition 2: B
    B Fixed screen confirmation:
    Execute echo stopgetbuff 0 0 ON > /proc/mi_modules/mi_disp/mi_disp0 for a fixed screen
    Confirm if “SrcFrmrate” “DstFrmrate” in debug information meet expectations
    		Exit Condition 1: SrcFrmrate does not meet expectations;
    Exit Condition 2: SrcFrmrate meets expectations, only DstFrmrate does not meet expectations     		Exit Condition 1: Please seek assistance from the upstream owner;
    Exit Condition 2: C
    C Dump information for Disp owner analysis:
    1, ./pcupid_mhal_disp_reg.sh [log_file] [dump_cnt]
    2, cat /proc/mi_modules/mi_disp/mi_disp0
    		 NA NA

    3.2 MOP Memory Overlap

    Debug Process:

    Process Confirmation Method Exit Conditions Next Step Information to Provide Related FAQs
    A MIU BW confirmation:
    cat /sys/devices/system/miu/miu0/bw
    		 Exit Condition 1: Insufficient BW;
    Exit Condition 2: Sufficient BW    		 Exit Condition 1: Please seek assistance from the MIU owner;
    Exit Condition 2: B
    B CPU loading investigation:
    Use the top command to check current CPU loading
    		Exit Condition 1: CPU loading too high;
    Exit Condition 2: CPU loading normal     		Exit Condition 1: Please ask the customer to assist in reducing CPU loading and try again;
    Exit Condition 2: C
    C Debug mmu confirmation:
    Seek FAE assistance
    		NA NA
    D Dump information and seek FAE assistance for analysis:
    1, cat /proc/mi_modules/mi_disp/mi_disp0
    2, Capture reproduction log:
    echo 8 > /proc/mi_modules/mi_disp/debug_level； echo trace 0 1 > /proc/mi_modules/mi_disp/mi_disp0； cat kmsg；     		NA NA