linux-kernel - [PATCH V2 1/2] ata: ahci: append new hflag AHCI_HFLAG_NO

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Message-ID: <1397107468-640-2-git-send-email-wangkefeng.wang@huawei.com>
Date:	Thu, 10 Apr 2014 13:24:27 +0800
From:	Kefeng Wang <wangkefeng.wang@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	Hans de Goede <hdegoede@...hat.com>, <linux-ide@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <guohanjun@...wei.com>,
	Kefeng Wang <kefeng.wang@...aro.org>,
	Haojian Zhuang <haojian.zhuang@...aro.org>
Subject: [PATCH V2 1/2] ata: ahci: append new hflag AHCI_HFLAG_NO_FBS

From: Kefeng Wang <kefeng.wang@...aro.org>

Append AHCI_HFLAG_NO_FBS to force turning off FBS flag.

Signed-off-by: Haojian Zhuang <haojian.zhuang@...aro.org>
Signed-off-by: Kefeng Wang <kefeng.wang@...aro.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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