linux-kernel - RE: [RFC PATCH v1] ufs: poll HCS.UCRDY before issuing a UIC command

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Date:   Wed, 10 May 2023 10:14:18 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Kiwoong Kim <kwmad.kim@...sung.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        "sc.suh@...sung.com" <sc.suh@...sung.com>,
        "hy50.seo@...sung.com" <hy50.seo@...sung.com>,
        "sh425.lee@...sung.com" <sh425.lee@...sung.com>,
        "kwangwon.min@...sung.com" <kwangwon.min@...sung.com>
Subject: RE: [RFC PATCH v1] ufs: poll HCS.UCRDY before issuing a UIC command

> With auto hibern8 enabled, UIC could be working
> for a while to process a hibern8 operation and HCI
> reports UIC not ready for a short term through HCS.UCRDY.
> And UFS driver can't recognize the operation.
> UFSHCI spec specifies UCRDY like this:
> whether the host controller is ready to process UIC COMMAND
> 
> The 'ready' could be seen as many different meanings. If the meaning
> includes not processing any request from HCI, processing a hibern8
> operation can be 'not ready'. In this situation, the driver needs to
> wait until the operations is completed.
> 
> Signed-off-by: Kiwoong Kim <kwmad.kim@...sung.com>
Is this replaces your previous suggestion - https://lore.kernel.org/lkml/1682385635-43601-1-git-send-email-kwmad.kim@samsung.com/
Or is it addressing another issue?

Thanks,
Avri

> ---
>  drivers/ufs/core/ufshcd.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 96ce6af..fc79539 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -2368,7 +2368,18 @@ static inline int ufshcd_hba_capabilities(struct
> ufs_hba *hba)
>   */
>  static inline bool ufshcd_ready_for_uic_cmd(struct ufs_hba *hba)
>  {
> -       return ufshcd_readl(hba, REG_CONTROLLER_STATUS) &
> UIC_COMMAND_READY;
> +       ktime_t timeout = ktime_add_ms(ktime_get(), UIC_CMD_TIMEOUT);
> +       u32 val = 0;
> +
> +       do {
> +               val = ufshcd_readl(hba, REG_CONTROLLER_STATUS) &
> +                       UIC_COMMAND_READY;
> +               if (val)
> +                       break;
> +               usleep_range(500, 1000);
> +       } while (ktime_before(ktime_get(), timeout));
> +
> +       return val ? true : false;
>  }
> 
>  /**
> --
> 2.7.4