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Date:   Tue, 21 Apr 2020 13:52:21 +0800
From:   Can Guo <cang@codeaurora.org>
To:     Alim Akhtar <alim.akhtar@samsung.com>
Cc:     robh@kernel.org, devicetree@vger.kernel.org,
        linux-scsi@vger.kernel.org, krzk@kernel.org, avri.altman@wdc.com,
        martin.petersen@oracle.com, kwmad.kim@samsung.com,
        stanley.chu@mediatek.com, linux-samsung-soc@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 01/10] scsi: ufs: add quirk to fix mishandling
 utrlclr/utmrlclr
In-Reply-To: <20200417175944.47189-2-alim.akhtar@samsung.com>
References: <20200417175944.47189-1-alim.akhtar@samsung.com>
 <CGME20200417181008epcas5p460840c01c2c09ce1a69e83005b4bddbe@epcas5p4.samsung.com>
 <20200417175944.47189-2-alim.akhtar@samsung.com>
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On 2020-04-18 01:59, 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@gmail.com>
> Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>

Reviewed-by: Can Guo <cang@codeaurora.org>

> ---
>  drivers/scsi/ufs/ufshcd.c | 11 +++++++++--
>  drivers/scsi/ufs/ufshcd.h |  5 +++++
>  2 files changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 698e8d20b4ba..3655b88fc862 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -645,7 +645,11 @@ static inline int ufshcd_get_tr_ocs(struct
> ufshcd_lrb *lrbp)
>   */
>  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);
>  }
> 
>  /**
> @@ -655,7 +659,10 @@ static inline void ufshcd_utrl_clear(struct
> ufs_hba *hba, u32 pos)
>   */
>  static inline void ufshcd_utmrl_clear(struct ufs_hba *hba, u32 pos)
>  {
> -	ufshcd_writel(hba, ~(1 << pos), REG_UTP_TASK_REQ_LIST_CLEAR);
> +	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);
>  }
> 
>  /**
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index 6ffc08ad85f6..071f0edf3f64 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -518,6 +518,11 @@ enum ufshcd_quirks {
>  	 * ops (get_ufs_hci_version) to get the correct version.
>  	 */
>  	UFSHCD_QUIRK_BROKEN_UFS_HCI_VERSION		= 1 << 5,
> +
> +	/*
> +	 * Clear handling for transfer/task request list is just opposite.
> +	 */
> +	UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR		= 1 << 6,
>  };
> 
>  enum ufshcd_caps {
> 
> base-commit: 8f3d9f354286745c751374f5f1fcafee6b3f3136