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SubjectRe: [PATCH v1 1/1] scsi: ufs: set device as active power mode after resetting device
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Hi,

On 3/27/2020 2:58 AM, Stanley Chu wrote:
> Currently ufshcd driver assumes that bInitPowerMode parameter
> is not changed by any vendors thus device power mode can be set as
> "Active" during initialization.
>
> According to UFS JEDEC specification, device power mode shall be
> "Active" after HW Reset is triggered if the bInitPowerMode parameter
> in Device Descriptor is default value.
>
> By above description, we can set device power mode as "Active" after
> device reset is triggered by vendor's callback. With this change,
> the link startup performance can be improved in some cases
> by not setting link_startup_again as true in ufshcd_link_startup().
>
> Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
> ---

Reviewed-by: Asutosh Das <asutoshd@codeaurora.org>

> drivers/scsi/ufs/ufshcd.c | 13 -------------
> drivers/scsi/ufs/ufshcd.h | 14 ++++++++++++++
> 2 files changed, 14 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 227660a1a446..f0a35b289b7c 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -171,19 +171,6 @@ enum {
> #define ufshcd_clear_eh_in_progress(h) \
> ((h)->eh_flags &= ~UFSHCD_EH_IN_PROGRESS)
>
> -#define ufshcd_set_ufs_dev_active(h) \
> - ((h)->curr_dev_pwr_mode = UFS_ACTIVE_PWR_MODE)
> -#define ufshcd_set_ufs_dev_sleep(h) \
> - ((h)->curr_dev_pwr_mode = UFS_SLEEP_PWR_MODE)
> -#define ufshcd_set_ufs_dev_poweroff(h) \
> - ((h)->curr_dev_pwr_mode = UFS_POWERDOWN_PWR_MODE)
> -#define ufshcd_is_ufs_dev_active(h) \
> - ((h)->curr_dev_pwr_mode == UFS_ACTIVE_PWR_MODE)
> -#define ufshcd_is_ufs_dev_sleep(h) \
> - ((h)->curr_dev_pwr_mode == UFS_SLEEP_PWR_MODE)
> -#define ufshcd_is_ufs_dev_poweroff(h) \
> - ((h)->curr_dev_pwr_mode == UFS_POWERDOWN_PWR_MODE)
> -
> struct ufs_pm_lvl_states ufs_pm_lvl_states[] = {
> {UFS_ACTIVE_PWR_MODE, UIC_LINK_ACTIVE_STATE},
> {UFS_ACTIVE_PWR_MODE, UIC_LINK_HIBERN8_STATE},
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index b7bd81795c24..7a9d1d170719 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -129,6 +129,19 @@ enum uic_link_state {
> #define ufshcd_set_link_hibern8(hba) ((hba)->uic_link_state = \
> UIC_LINK_HIBERN8_STATE)
>
> +#define ufshcd_set_ufs_dev_active(h) \
> + ((h)->curr_dev_pwr_mode = UFS_ACTIVE_PWR_MODE)
> +#define ufshcd_set_ufs_dev_sleep(h) \
> + ((h)->curr_dev_pwr_mode = UFS_SLEEP_PWR_MODE)
> +#define ufshcd_set_ufs_dev_poweroff(h) \
> + ((h)->curr_dev_pwr_mode = UFS_POWERDOWN_PWR_MODE)
> +#define ufshcd_is_ufs_dev_active(h) \
> + ((h)->curr_dev_pwr_mode == UFS_ACTIVE_PWR_MODE)
> +#define ufshcd_is_ufs_dev_sleep(h) \
> + ((h)->curr_dev_pwr_mode == UFS_SLEEP_PWR_MODE)
> +#define ufshcd_is_ufs_dev_poweroff(h) \
> + ((h)->curr_dev_pwr_mode == UFS_POWERDOWN_PWR_MODE)
> +
> /*
> * UFS Power management levels.
> * Each level is in increasing order of power savings.
> @@ -1091,6 +1104,7 @@ static inline void ufshcd_vops_device_reset(struct ufs_hba *hba)
> {
> if (hba->vops && hba->vops->device_reset) {
> hba->vops->device_reset(hba);
> + ufshcd_set_ufs_dev_active(hba);
> ufshcd_update_reg_hist(&hba->ufs_stats.dev_reset, 0);
> }
> }
>


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

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