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FROMLIST: scsi: ufs: Allow async suspend/resume callbacks

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Allow UFS suspend/resume callbacks to run in parallel with other
suspend/resume callbacks. This can recoup dozens of milliseconds on the
resume path if UFS hardware needs to be powered back on.

Suspending and resuming asynchronously is safe to do so long as the driver
callbacks only depend on resources made available by either a) parent
devices or b) devices explicitly marked as suppliers with device_link_add.

Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Stanley Chu <stanley.chu@mediatek.com>
Cc: Can Guo <cang@codeaurora.org>
Cc: Asutosh Das <asutoshd@codeaurora.org>
Cc: Avri Altman <avri.altman@wdc.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Vincent Palomares <paillon@google.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Vincent Palomares <paillon@google.com>
Link: https://lore.kernel.org/linux-scsi/a7091f96-12a3-a244-040a-c41a7c5e3617@acm.org/T/#t
Bug: 194213025
Change-Id: I46ff584d3a1342ab3b26ffdf196e7a65637294f3
This commit is contained in:
Vincent Palomares
2021-07-21 18:37:58 -07:00
parent 98afdd197f
commit cf1646cba3
1 changed files with 1 additions and 0 deletions
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1
drivers/scsi/ufs/ufshcd.c
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@@ -9541,6 +9541,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq)
async_schedule(ufshcd_async_scan, hba);
ufs_sysfs_add_nodes(hba);
device_enable_async_suspend(dev);
return 0;
free_tmf_queue: