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scsi: ufs: fix Auto-Hibern8 error detection 

Auto-Hibern8 may be disabled by some vendors or sysfs in runtime even if
Auto-Hibern8 capability is supported by host. If Auto-Hibern8 capability is
supported by host but not actually enabled, Auto-Hibern8 error shall not
happen.

To fix this, provide a way to detect if Auto-Hibern8 is actually enabled
first, and bypass Auto-Hibern8 disabling case in
ufshcd_is_auto_hibern8_error().

Fixes: 8217444039 ("scsi: ufs: Add error-handling of Auto-Hibernate")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200129105251.12466-4-stanley.chu@mediatek.com
Reviewed-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Reviewed-by: Asutosh Das <asutoshd@codeaurora.org>
Reviewed-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Stanley Chu 2020-01-29 18:52:50 +08:00 committed by Martin K. Petersen
parent 2a06ff2074
commit 5a244e0ea6
2 changed files with 8 additions and 1 deletions
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3
drivers/scsi/ufs/ufshcd.c
View File

@ -5479,7 +5479,8 @@ static irqreturn_t ufshcd_update_uic_error(struct ufs_hba *hba)
static bool ufshcd_is_auto_hibern8_error(struct ufs_hba *hba,
u32 intr_mask)
{
if (!ufshcd_is_auto_hibern8_supported(hba))
if (!ufshcd_is_auto_hibern8_supported(hba) ||
!ufshcd_is_auto_hibern8_enabled(hba))
return false;
if (!(intr_mask & UFSHCD_UIC_HIBERN8_MASK))

6
drivers/scsi/ufs/ufshcd.h
View File

@ -55,6 +55,7 @@
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/regulator/consumer.h>
#include <linux/bitfield.h>
#include "unipro.h"
#include <asm/irq.h>
@ -773,6 +774,11 @@ static inline bool ufshcd_is_auto_hibern8_supported(struct ufs_hba *hba)
return (hba->capabilities & MASK_AUTO_HIBERN8_SUPPORT);
}
static inline bool ufshcd_is_auto_hibern8_enabled(struct ufs_hba *hba)
{
return FIELD_GET(UFSHCI_AHIBERN8_TIMER_MASK, hba->ahit) ? true : false;
}
#define ufshcd_writel(hba, val, reg) \
writel((val), (hba)->mmio_base + (reg))
#define ufshcd_readl(hba, reg) \