[PATCH] drm: meson_drv add shutdown function

[Neil Armstrong]

On 02/03/2021 05:22, Artem Lapkin wrote:
> Problem: random stucks on reboot stage about 1/20 stuck/reboots
> // debug kernel log
> [    4.496660] reboot: kernel restart prepare CMD:(null)
> [    4.498114] meson_ee_pwrc c883c000.system-controller:power-controller: shutdown begin
> [    4.503949] meson_ee_pwrc c883c000.system-controller:power-controller: shutdown domain 0:VPU...
> ...STUCK...
> 
> Solution: add shutdown function to meson_drm driver 
> // debug kernel log
> [    5.231896] reboot: kernel restart prepare CMD:(null)
> [    5.246135] [drm:meson_drv_shutdown]
> ...
> [    5.259271] meson_ee_pwrc c883c000.system-controller:power-controller: shutdown begin
> [    5.274688] meson_ee_pwrc c883c000.system-controller:power-controller: shutdown domain 0:VPU...
> [    5.338331] reboot: Restarting system
> [    5.358293] psci: PSCI_0_2_FN_SYSTEM_RESET reboot_mode:0 cmd:(null)
> bl31 reboot reason: 0xd
> bl31 reboot reason: 0x0
> system cmd  1.
> ...REBOOT...
> 
> Tested: on VIM1 VIM2 VIM3 VIM3L khadas sbcs - 1000+ successful reboots
> and Odroid boards, WeTek Play2 (GXBB)
> 

Fixes: bbbe775ec5b5 ("drm: Add support for Amlogic Meson Graphic Controller")

> Tested-by: Christian Hewitt <christianshewitt at gmail.com>
> Signed-off-by: Artem Lapkin <art at khadas.com>
> 
> ---
>  drivers/gpu/drm/meson/meson_drv.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
> index 42c5d3246..693bb1293 100644
> --- a/drivers/gpu/drm/meson/meson_drv.c
> +++ b/drivers/gpu/drm/meson/meson_drv.c
> @@ -482,6 +482,16 @@ static int meson_probe_remote(struct platform_device *pdev,
>  	return count;
>  }
>  
> +static void meson_drv_shutdown(struct platform_device *pdev)
> +{
> +	struct meson_drm *priv = dev_get_drvdata(&pdev->dev);
> +	struct drm_device *drm = priv->drm;
> +
> +	DRM_DEBUG_DRIVER("\n");
> +	drm_kms_helper_poll_fini(drm);
> +	drm_atomic_helper_shutdown(drm);
> +}
> +
>  static int meson_drv_probe(struct platform_device *pdev)
>  {
>  	struct component_match *match = NULL;
> @@ -553,6 +563,7 @@ static const struct dev_pm_ops meson_drv_pm_ops = {
>  
>  static struct platform_driver meson_drm_platform_driver = {
>  	.probe      = meson_drv_probe,
> +	.shutdown   = meson_drv_shutdown,
>  	.driver     = {
>  		.name	= "meson-drm",
>  		.of_match_table = dt_match,
> 

Acked-by: Neil Armstrong <narmstrong at baylibre.com>