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Commit 49e50ebb authored by Anjana Hari's avatar Anjana Hari
Browse files

scsi: ufs: Handle runtime PM during hibernation 



In hibernation path, if runtime suspend is triggered, the
freeze-thaw-restore callflow will be disrupted due to PM
runtime worker threads that get invoked which tries to
resume scsi host before resuming ufshc. Disbale runtime PM
at the beginning of freeze and enable it after restoring.
Apart from being executed after creating hibernation image,
Thaw is also a fallback mechanism in case of failed image
creation or restoration. So runtime PM can be enabled in
exit path of thaw.

Change-Id: I6afc8e556814c4bcf4482d79d03bd233f7c947d5
Signed-off-by: default avatarAnjana Hari <ahari@codeaurora.org>
parent 655c6aa6

drivers/scsi/ufs/ufshcd.c

+40 −3
Original line number Diff line number Diff line
@@ -10615,20 +10615,57 @@ EXPORT_SYMBOL(ufshcd_runtime_idle); 


int ufshcd_system_freeze(struct ufs_hba *hba)

{

	return ufshcd_system_suspend(hba);

	int ret = 0;



	/*

	 * Run time resume the controller to make sure

	 * the PM work queue threads do not try to resume

	 * the child (scsi host), which leads to errors as

	 * the controller is not yet resumed.

	 */

	pm_runtime_get_sync(hba->dev);

	ret = ufshcd_system_suspend(hba);

	pm_runtime_put_sync(hba->dev);



	/*

	 * Ensure no runtime PM operations take

	 * place in the hibernation and restore sequence

	 * on successful freeze operation.

	 */

	if (!ret)

		pm_runtime_disable(hba->dev);



	return ret;

}

EXPORT_SYMBOL(ufshcd_system_freeze);



int ufshcd_system_restore(struct ufs_hba *hba)

{

	int ret = 0;



	hba->restore = true;

	return ufshcd_system_resume(hba);

	ret = ufshcd_system_resume(hba);



	/*

	 * Now any runtime PM operations can be

	 * allowed on successful restore operation

	 */

	if (!ret)

		pm_runtime_enable(hba->dev);



	return ret;

}

EXPORT_SYMBOL(ufshcd_system_restore);



int ufshcd_system_thaw(struct ufs_hba *hba)

{

	return ufshcd_system_resume(hba);

	int ret = 0;



	ret = ufshcd_system_resume(hba);

	if (!ret)

		pm_runtime_enable(hba->dev);



	return ret;

}

EXPORT_SYMBOL(ufshcd_system_thaw);