Device tree binding

Runtime power management

static const struct dev_pm_ops mali_dev_pm_ops = {
#ifdef CONFIG_PM_RUNTIME
        .runtime_suspend = mali_driver_runtime_suspend,
        .runtime_resume = mali_driver_runtime_resume,
        .runtime_idle = mali_driver_runtime_idle,
#endif
        .suspend = mali_driver_suspend_scheduler,
        .resume = mali_driver_resume_scheduler,
        .freeze = mali_driver_suspend_scheduler,
        .thaw = mali_driver_resume_scheduler,
        .poweroff = mali_driver_suspend_scheduler,
};
#endif

mali_platform_device_register()
{
        ...
        pm_runtime_set_autosuspend_delay(&&(mali_gpu_device.dev), 1000);
        pm_runtime_use_autosuspend(&&(mali_gpu_device.dev));
#endif
        pm_runtime_enable(&&(mali_gpu_device.dev));
        ...
}

mali_scheduler_queue_gp_job()
{
        ...
        _mali_osk_pm_dev_ref_get_async()
        ...
}
 
mali_scheduler_complete_gp_job()
{
        ...
        _mali_osk_pm_dev_ref_pet_async()
        ...
}

mali_pm_common_suspend()
{
        ...
        if (0 < num_groups_down) {
                mali_executor_group_power_down(groups_down, num_groups_down);
                }
 
        for (i = 0; i < num_l2_down; i++) {
                mali_l2_cache_power_down(l2_down[i]);
        }
 
        ...
}

Selecting particular backends:

You can select particular backend while configuring rootfs

File: project-spec/config/rootfs_config

petalinux-config -c rootfs

1. Wayland/GBM backend:

   By default, plnx build system will try to package all the backends in the rootfs and depending upon the rootfs config, we create a link to the correct backend. Fbdev, X11, wayland and headless are the choices we have.

   For example: Once you have selected libmali through 'petalinux-config -c rootfs', select backend to wayland and unselect 'packagegroup-petalinux-matchbox' and 'packagegroup-petalinux-x11' and select 'packagegroup-petalinux-weston'. After selection your rootfs_config will look as below. 

   Code Block
   theme Midnight
   CONFIG_libmali-xlnx=y CONFIG_mali-backend-wayland=y

   This packagegroup ensures all the essential wayland/weston packages are packaged into the rootfs for having a wayland/weston application work out of the box. On boot, export following parameter in your terminal console.

   
   

   Code Block
   theme Midnight
   export XDG_RUNTIME_DIR=/run/

   
   

   Now, you can run sample benchmarking application glmark2-es2-wayland.

2. X11 backend:

   By default, Mali supports X11 backend. Just select libmali-xlnx package from 'petalinux-config -c rootfs'. The root filesystem should now have libmali with X11 support. Also, please select at least one window manager. For example: packagegroup-petalinux-matchbox.

   Once you have selected libmali through 'petalinux-config -c rootfs', and selected backend to x11, your rootfs_config will look as below.

   
   

   Code Block
   theme Midnight
   CONFIG_libmali-xlnx=y CONFIG_mali-backend-x11=y

   
   

3. Fbdev backend:

   Just select libmali-xlnx package from 'petalinux-config -c rootfs' and select fbdev backend.

   Once you have selected libmali through 'petalinux-config -c rootfs' unselect 'packagegroup-petalinux-matchbox' and 'packagegroup-petalinux-x11'. Your rootfs_config will look as below.

   
   

   Code Block
   theme Midnight
   CONFIG_libmali-xlnx=y CONFIG_mali-backend-fbdev=y

   
   

4. Headless-EGL backend:

   Just select libmali-xlnx package from 'petalinux-config -c rootfs' and select headless backend. Unselect 'packagegroup-petalinux-matchbox' and 'packagegroup-petalinux-x11'.

   Once you have selected libmali through 'petalinux-config -c rootfs', and selected backend to headless, your rootfs_config will look as below.

   Code Block
   theme Midnight
   CONFIG_libmali-xlnx=y CONFIG_mali-backend-headless=y

   Please find more details for Headless rendering on below page.

   Mali 400 Headless rendering

Benchmark:

To run a benchmark example for x11 and wayland backend, please add below lines to build/conf/local.conf

IMAGE_INSTALL:append = "glmark2"