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libata: skip debounce delay on link resume

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The link resume logic uses a 200msec delay while debouncing
the SControl register. The rationale behind that delay is
to accommodate some PHYs that behave badly if their SStatus/
SControl registers are pounded immediately on resume.
The Broadcom STB SATA PHY does not seem to have this issue.
This patch introduces a new link flag that allows platforms
to skip the debounce delay if it isn't needed.

Signed-off-by: Danesh Petigara <dpetigara@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Danesh Petigara
2016-01-07 16:03:33 -08:00
committed by Tejun Heo
parent 6ca92dd7af
commit e39b2bb3b7
3 changed files with 4 additions and 1 deletions
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drivers/ata/libata-core.c
+2 -1
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@@ -3598,7 +3598,8 @@ int sata_link_resume(struct ata_link *link, const unsigned long *params,
* immediately after resuming. Delay 200ms before
* debouncing.
*/
ata_msleep(link->ap, 200);
if (!(link->flags & ATA_LFLAG_NO_DB_DELAY))
ata_msleep(link->ap, 200);
/* is SControl restored correctly? */
if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))