From: Stanley Chu stanley.chu@mediatek.com
commit 5a244e0ea67b293abb1d26c825db2ddde5f2862f upstream.
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: 821744403913 ("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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/scsi/ufs/ufshcd.c | 3 ++- drivers/scsi/ufs/ufshcd.h | 6 ++++++ 2 files changed, 8 insertions(+), 1 deletion(-)
--- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -5486,7 +5486,8 @@ static irqreturn_t ufshcd_update_uic_err 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)) --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -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_hibern 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) \