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Subject[PATCH V2 1/2] ata: ahci: append new hflag AHCI_HFLAG_NO_FBS
Date
From: Kefeng Wang <kefeng.wang@linaro.org>

Append AHCI_HFLAG_NO_FBS to force turning off FBS flag.

Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
Signed-off-by: Kefeng Wang <kefeng.wang@linaro.org>
---
drivers/ata/ahci.h | 1 +
drivers/ata/libahci.c | 5 +++++
2 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index 51af275..60db49b 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -235,6 +235,7 @@ enum {
port start (wait until
error-handling stage) */
AHCI_HFLAG_MULTI_MSI = (1 << 16), /* multiple PCI MSIs */
+ AHCI_HFLAG_NO_FBS = (1 << 17), /* no FBS */

/* ap->flags bits */

diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 6bd4f66..573edb3 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -452,6 +452,11 @@ void ahci_save_initial_config(struct device *dev,
cap &= ~HOST_CAP_SNTF;
}

+ if ((cap & HOST_CAP_FBS) && (hpriv->flags & AHCI_HFLAG_NO_FBS)) {
+ dev_info(dev, "controller can't do FBS, turning off CAP_FBS\n");
+ cap &= ~HOST_CAP_FBS;
+ }
+
if (!(cap & HOST_CAP_FBS) && (hpriv->flags & AHCI_HFLAG_YES_FBS)) {
dev_info(dev, "controller can do FBS, turning on CAP_FBS\n");
cap |= HOST_CAP_FBS;
--
1.7.1



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