linux-kernel - Re: [PATCH 1/4] scsi: ufs: add quirk to fix mishandling utrlclr/utmrlclr

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Date:   Wed, 16 May 2018 14:23:46 -0700
From:   Subhash Jadavani <subhashj@...eaurora.org>
To:     Alim Akhtar <alim.akhtar@...sung.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        jejb@...ux.vnet.ibm.com, martin.petersen@...cle.com,
        vivek.gautam@...eaurora.org, vinholikatti@...il.com,
        olof@...om.net, linux-scsi-owner@...r.kernel.org
Subject: Re: [PATCH 1/4] scsi: ufs: add quirk to fix mishandling
 utrlclr/utmrlclr

On 2018-05-06 03:14, Alim Akhtar wrote:
> In the right behavior, setting the bit to '0' indicates clear and
> '1' indicates no change. If host controller handles this the other way,
> UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR can be used.
> 
> Signed-off-by: Seungwon Jeon <essuuj@...il.com>
> Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
> ---
>  drivers/scsi/ufs/ufshcd.c | 21 +++++++++++++++++++--
>  drivers/scsi/ufs/ufshcd.h |  5 +++++
>  2 files changed, 24 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 00e7905..9898ce5 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -675,7 +675,24 @@ static inline void ufshcd_put_tm_slot(struct
> ufs_hba *hba, int slot)
>   */
>  static inline void ufshcd_utrl_clear(struct ufs_hba *hba, u32 pos)
>  {
> -	ufshcd_writel(hba, ~(1 << pos), REG_UTP_TRANSFER_REQ_LIST_CLEAR);
> +	if (hba->quirks & UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR)
> +		ufshcd_writel(hba, (1 << pos), REG_UTP_TRANSFER_REQ_LIST_CLEAR);
> +	else
> +		ufshcd_writel(hba, ~(1 << pos),
> +				REG_UTP_TRANSFER_REQ_LIST_CLEAR);
> +}
> +
> +/**
> + * ufshcd_utmrl_clear - Clear a bit in UTRMLCLR register
> + * @hba: per adapter instance
> + * @pos: position of the bit to be cleared
> + */
> +static inline void ufshcd_utmrl_clear(struct ufs_hba *hba, u32 pos)
> +{
> +	if (hba->quirks & UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR)
> +		ufshcd_writel(hba, (1 << pos), REG_UTP_TASK_REQ_LIST_CLEAR);
> +	else
> +		ufshcd_writel(hba, ~(1 << pos), REG_UTP_TASK_REQ_LIST_CLEAR);
>  }
> 
>  /**
> @@ -5398,7 +5415,7 @@ static int ufshcd_clear_tm_cmd(struct ufs_hba
> *hba, int tag)
>  		goto out;
> 
>  	spin_lock_irqsave(hba->host->host_lock, flags);
> -	ufshcd_writel(hba, ~(1 << tag), REG_UTP_TASK_REQ_LIST_CLEAR);
> +	ufshcd_utmrl_clear(hba, tag);
>  	spin_unlock_irqrestore(hba->host->host_lock, flags);
> 
>  	/* poll for max. 1 sec to clear door bell register by h/w */
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index 8110dcd..43035f8 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -595,6 +595,11 @@ struct ufs_hba {
>  	 */
>  	#define UFSHCD_QUIRK_PRDT_BYTE_GRAN			0x80
> 
> +	/*
> +	 * Cleaer handling for transfer/task request list is just opposite.
> +	 */
> +	#define UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR		0x100
> +
>  	unsigned int quirks;	/* Deviations from standard UFSHCI spec. */
> 
>  	/* Device deviations from standard UFS device spec. */

Looks good to me.
Reviewed-by: Subhash Jadavani <subhashj@...eaurora.org>

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