linux-kernel - Re: [PATCH RESEND v3 3/4] scsi: ufs: fix Auto-Hibern8 error detection

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Date:   Wed, 05 Feb 2020 10:26:35 +0800
From:   Can Guo <cang@...eaurora.org>
To:     Stanley Chu <stanley.chu@...iatek.com>
Cc:     linux-scsi@...r.kernel.org, martin.petersen@...cle.com,
        avri.altman@....com, alim.akhtar@...sung.com, jejb@...ux.ibm.com,
        beanhuo@...ron.com, asutoshd@...eaurora.org,
        matthias.bgg@...il.com, bvanassche@....org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kuohong.wang@...iatek.com, peter.wang@...iatek.com,
        chun-hung.wu@...iatek.com, andy.teng@...iatek.com,
        stable@...r.kernel.org
Subject: Re: [PATCH RESEND v3 3/4] scsi: ufs: fix Auto-Hibern8 error detection

On 2020-01-29 18:52, 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@...r.kernel.org
> Signed-off-by: Stanley Chu <stanley.chu@...iatek.com>
> Reviewed-by: Bean Huo <beanhuo@...ron.com>
> ---

Reviewed-by: Can Guo <cang@...eaurora.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)	\