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SubjectRe: [PATCH 2/3] scsi: ufs: Keep device power on only fWriteBoosterBufferFlushDuringHibernate == 1
On 2020-12-01 02:11, Bean Huo wrote:
> From: Bean Huo <beanhuo@micron.com>
>
> Keep device power mode as active power mode and VCC supply only if
> fWriteBoosterBufferFlushDuringHibernate setting 1 is successful.
>
> Signed-off-by: Bean Huo <beanhuo@micron.com>
> ---
> drivers/scsi/ufs/ufs.h | 2 ++
> drivers/scsi/ufs/ufshcd.c | 11 ++++++++++-
> 2 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
> index d593edb48767..311d5f7a024d 100644
> --- a/drivers/scsi/ufs/ufs.h
> +++ b/drivers/scsi/ufs/ufs.h
> @@ -530,6 +530,8 @@ struct ufs_dev_info {
> bool f_power_on_wp_en;
> /* Keeps information if any of the LU is power on write protected */
> bool is_lu_power_on_wp;
> + /* Indicates if flush WB buffer during hibern8 successfully enabled
> */
> + bool is_hibern8_wb_flush;
> /* Maximum number of general LU supported by the UFS device */
> u8 max_lu_supported;
> u8 wb_dedicated_lu;
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 639ba9d1ccbb..eb7a2534b072 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -285,10 +285,16 @@ static inline void ufshcd_wb_config(struct
> ufs_hba *hba)
> dev_err(hba->dev, "%s: Enable WB failed: %d\n", __func__, ret);
> else
> dev_info(hba->dev, "%s: Write Booster Configured\n", __func__);
> +
> ret = ufshcd_wb_toggle_flush_during_h8(hba, true);
> - if (ret)
> + if (ret) {
> dev_err(hba->dev, "%s: En WB flush during H8: failed: %d\n",
> __func__, ret);
> + hba->dev_info.is_hibern8_wb_flush = false;
> + } else {
> + hba->dev_info.is_hibern8_wb_flush = true;
> + }
> +
> ufshcd_wb_toggle_flush(hba, true);
> }
>
> @@ -5440,6 +5446,9 @@ static bool ufshcd_wb_need_flush(struct ufs_hba
> *hba)
>
> if (!ufshcd_is_wb_allowed(hba))
> return false;
> +
> + if (!hba->dev_info.is_hibern8_wb_flush)
> + return false;

The check is in the wrong place - even if say
fWriteBoosterBufferFlushDuringHibernate is failed to be enabled,
ufshcd_wb_need_flush() still needs to reflect the fact that whether
the wb buffer needs to be flushed or not - it should not be decided
by the flag.

Thanks,

Can Guo.

> /*
> * The ufs device needs the vcc to be ON to flush.
> * With user-space reduction enabled, it's enough to enable flush

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