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SubjectRe: [PATCH 1/4] scsi: ufs: add quirk to fix mishandling utrlclr/utmrlclr
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On 5/6/2018 3:44 PM, 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>
> ---
> 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.
> + */
Spell check - should be 'Clear'
> + #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, except the spell-check.

--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
Linux Foundation Collaborative Project

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