scsi: ufs-mediatek: Do not gate clocks if auto-hibern8 is not entered yet

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There is a chance that link enters hibern8 via auto-hibern8 scheme during
the clock-gating flow. Clocks shall not be gated if link is still active
otherwise host or device may hang.

Fix this by returning error code to the caller __ufshcd_setup_clocks() to
skip gating clocks there if link is not confirmed in hibern8 state yet.

Also allow some waiting time for the hibern8 state transition.

Link: https://lore.kernel.org/r/20200601104646.15436-3-stanley.chu@mediatek.com
Reviewed-by: Andy Teng <andy.teng@mediatek.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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Stanley Chu 2020-06-01 18:46:43 +08:00 • committed by Martin K. Petersen

parent fb43337cd4

commit 9006e3986f

1 changed files with 27 additions and 9 deletions

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drivers/scsi/ufs/ufs-mediatek.c

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