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gpu: nvgpu: Fix gk20a shutdown issue

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With CONFIG_PM_GENERIC_DOMAINS_OF enabled, device reboot
was getting hung while shutting-down gk20a. It was
happening because genpd_dev_pm_detach() was railgating
gk20a while other thread was still accessing it.

So, assigning NULL to dev->pm_domain->detach for gk20a,
so that genpd_dev_pm_detach() is not called during gk20a
shutdown, which will not railgate it.

This patch will be reverted once we have clean shutdown
for gk20a.

Bug 200070810
Bug 200099940

Change-Id: Ie2e89ea01a98a9d4f2f68a3ab07b6923ffa374f6
Signed-off-by: Sumit Singh <sumsingh@nvidia.com>
Reviewed-on: http://git-master/r/735455
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Tested-by: Bharat Nihalani <bnihalani@nvidia.com>
This commit is contained in:
Sumit Singh
2015-04-24 10:24:23 +05:30
committed by Ishan Mittal
parent 30e47f6984
commit 96ffe0c64d
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/nvgpu/gk20a/gk20a.c
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@@ -1210,11 +1210,19 @@ static int gk20a_pm_initialise_domain(struct platform_device *pdev)
struct gk20a_platform *platform = platform_get_drvdata(pdev);
struct dev_power_governor *pm_domain_gov = NULL;
struct generic_pm_domain *domain = dev_to_genpd(&pdev->dev);
struct device *dev = &pdev->dev;
#ifdef CONFIG_PM_RUNTIME
if (!platform->can_railgate)
pm_domain_gov = &pm_domain_always_on_gov;
#endif
/*
* FIXME: We can remove below assignment once we have clean shutdown
* for gk20a.
*/
if (dev->pm_domain)
dev->pm_domain->detach = NULL;
domain->gov = pm_domain_gov;
if (platform->railgate_delay)