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SubjectRe: [PATCH RESEND v3 3/4] scsi: ufs: fix Auto-Hibern8 error detection
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On 1/29/2020 2:52 AM, Stanley Chu wrote:
> 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
> Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
> Reviewed-by: Bean Huo <beanhuo@micron.com>
> ---

Reviewed-by: Asutosh Das <asutoshd@codeaurora.org>

> drivers/scsi/ufs/ufshcd.c | 3 ++-
> drivers/scsi/ufs/ufshcd.h | 6 ++++++
> 2 files changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index abd0e6b05f79..214a3f373dd8 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -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))
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index 2ae6c7c8528c..81c71a3e3474 100644
> --- 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_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) \
>


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