SPRADI3 June   2024 AM625 , AM62P , AM67 , AM67A , AM68 , AM68A , AM69 , AM69A , DRA829J , DRA829J-Q1 , DRA829V , DRA829V-Q1 , TDA4AEN-Q1 , TDA4AH-Q1 , TDA4AL-Q1 , TDA4AP-Q1 , TDA4APE-Q1 , TDA4VE-Q1 , TDA4VEN-Q1 , TDA4VH-Q1 , TDA4VL-Q1 , TDA4VM , TDA4VM-Q1 , TDA4VP-Q1 , TDA4VPE-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Common Issues with Graphics Applications
    1. 2.1 System or Application Freeze
      1. 2.1.1 Typical Kernel Panic Logs
    2. 2.2 Screen Tearing
    3. 2.3 Artifacts or Corruption in the Screen
    4. 2.4 Blank Screen
    5. 2.5 Low Frame Rate
    6. 2.6 GPU Driver Logs and Hardware Recoveries
      1. 2.6.1 Typical GPU HWR Logs
  6. 3Support Flow for Graphics Issues
    1. 3.1 Submit Preliminary Description
    2. 3.2 Determine if the Issue Reproduces on TI EVM
    3. 3.3 Provide Follow-Up Testing and Logs
  7. 4Tools for GPU Driver Debug
    1. 4.1 Driver Status in Linux® DebugFS
    2. 4.2 Driver AppHints
    3. 4.3 PVR Log Dump Collection
    4. 4.4 Adding Log Groups to Firmware Traces
    5. 4.5 Disabling the Driver After Hardware Recovery
    6. 4.6 Disable Autoloading of the GPU Driver
  8. 5Integrating Patched GPU Drivers
    1. 5.1 UM Libraries Installation
    2. 5.2 KM Libraries Installation
    3. 5.3 Post-Installation Steps
  9. 6Summary

4.2 Driver AppHints

The debugfs also contains information on the AppHints used by the GPU driver. AppHints are runtime configurations for modifying the behavior of the driver. However, the details of these AppHints is not exposed as the details are not useful for the regular operation of the driver. Instead, these hints help to tweak some of the characteristics of the driver and are very useful in situations where advanced debugging is necessary. These AppHints can be set for all graphics programs (default section) or specific ones through the /etc/powervr.ini file:

[default]
ParamBufferSize=2097152
[gles2test1]
ParamBufferSize=16777216

The syntax is the executable name in square brackets, followed by the AppHints to be enabled. The default section applies to all executables, while any other section can be named for a specific application. In this instance, the unit test case gles2test1 runs with ParamBufferSize smaller than other graphics programs.