diff options
| author | Danesh Petigara <dpetigara@broadcom.com> | 2016-01-08 01:03:33 +0100 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2016-01-08 17:50:14 +0100 |
| commit | e39b2bb3b72b999a04e8d295882be3255aca5ade (patch) | |
| tree | 03734de006c786e574b97ab5ed6178078ae884c0 | |
| parent | ata: ahci_brcmstb: disable DIPM support (diff) | |
| download | linux-e39b2bb3b72b999a04e8d295882be3255aca5ade.tar.xz linux-e39b2bb3b72b999a04e8d295882be3255aca5ade.zip | |
libata: skip debounce delay on link resume
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>
| -rw-r--r-- | drivers/ata/ahci_brcmstb.c | 1 | ||||
| -rw-r--r-- | drivers/ata/libata-core.c | 3 | ||||
| -rw-r--r-- | include/linux/libata.h | 1 |
3 files changed, 4 insertions, 1 deletions
diff --git a/drivers/ata/ahci_brcmstb.c b/drivers/ata/ahci_brcmstb.c index f61cbe30786f..b36cae2fd04b 100644 --- a/drivers/ata/ahci_brcmstb.c +++ b/drivers/ata/ahci_brcmstb.c @@ -85,6 +85,7 @@ struct brcm_ahci_priv { static const struct ata_port_info ahci_brcm_port_info = { .flags = AHCI_FLAG_COMMON | ATA_FLAG_NO_DIPM, + .link_flags = ATA_LFLAG_NO_DB_DELAY, .pio_mask = ATA_PIO4, .udma_mask = ATA_UDMA6, .port_ops = &ahci_platform_ops, diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index f5ae6f43b659..cbb74719d2c1 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -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))) diff --git a/include/linux/libata.h b/include/linux/libata.h index 83577f8fd15b..088ed924fa66 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -205,6 +205,7 @@ enum { ATA_LFLAG_NO_LPM = (1 << 8), /* disable LPM on this link */ ATA_LFLAG_RST_ONCE = (1 << 9), /* limit recovery to one reset */ ATA_LFLAG_CHANGED = (1 << 10), /* LPM state changed on this link */ + ATA_LFLAG_NO_DB_DELAY = (1 << 11), /* no debounce delay on link resume */ /* struct ata_port flags */ ATA_FLAG_SLAVE_POSS = (1 << 0), /* host supports slave dev */ |