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gpu: nvgpu: add railgate check in do_idle()

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In gk20a_do_idle(), check gk20a rail status before returning.
If rail is off, then only return success otherwise return
failure

Bug 1376916
Bug 1487804

Change-Id: I6280bf06c686b8baa4d6f49e90f47148411c3e02
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/415281
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Shridhar Rasal <srasal@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
This commit is contained in:
Deepak Nibade
2014-05-27 20:35:12 +05:30
committed by Dan Willemsen
parent 954117fe11
commit 3f7be93dab
1 changed files with 13 additions and 2 deletions
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15
drivers/gpu/nvgpu/gk20a/gk20a.c
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@@ -1658,9 +1658,20 @@ int gk20a_do_idle(void)
pm_runtime_put_sync(&pdev->dev);
/* add sufficient delay to allow GPU to rail gate */
mdelay(platform->railgate_delay + 100);
mdelay(platform->railgate_delay);
return 0;
if (platform->is_railgated(pdev))
return 0;
else {
/* wait for some more time */
mdelay(100);
if (platform->is_railgated(pdev))
return 0;
}
/* GPU is not rail gated by now, return error */
up_write(&g->busy_lock);
return -EBUSY;
fail:
pm_runtime_put_noidle(&pdev->dev);