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Merge "scsi: ufs: add support for low voltage VCC support"

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qctecmdr 2020-10-14 07:19:04 -07:00 • committed by Gerrit - the friendly Code Review server
commit f7e8799a6d
2 changed files with 54 additions and 1 deletions
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4
drivers/scsi/ufs/ufshcd-pltfrm.c
View file

@ -179,6 +179,10 @@ static int ufshcd_populate_vreg(struct device *dev, const char *name,
vreg->min_uV = be32_to_cpup(&prop[0]);
vreg->max_uV = be32_to_cpup(&prop[1]);
}
#if defined(CONFIG_SCSI_UFSHCD_QTI)
if (of_property_read_bool(np, "vcc-low-voltage-sup"))
vreg->low_voltage_sup = true;
#endif
}
} else if (!strcmp(name, "vccq")) {
vreg->min_uV = UFS_VREG_VCCQ_MIN_UV;

51
drivers/scsi/ufs/ufshcd.c
View file

@ -287,7 +287,14 @@ static int ufshcd_wb_buf_flush_disable(struct ufs_hba *hba);
int ufshcd_wb_ctrl(struct ufs_hba *hba, bool enable);
static int ufshcd_wb_toggle_flush_during_h8(struct ufs_hba *hba, bool set);
static inline void ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable);
#if defined(CONFIG_SCSI_UFSHCD_QTI)
static int ufshcd_set_dev_pwr_mode(struct ufs_hba *hba,
enum ufs_dev_pwr_mode pwr_mode);
static int ufshcd_config_vreg(struct device *dev,
struct ufs_vreg *vreg, bool on);
static int ufshcd_enable_vreg(struct device *dev, struct ufs_vreg *vreg);
static int ufshcd_disable_vreg(struct device *dev, struct ufs_vreg *vreg);
#endif
static inline bool ufshcd_valid_tag(struct ufs_hba *hba, int tag)
{
return tag >= 0 && tag < hba->nutrs;
@ -7152,6 +7159,40 @@ static inline void ufshcd_blk_pm_runtime_init(struct scsi_device *sdev)
scsi_autopm_put_device(sdev);
}
#if defined(CONFIG_SCSI_UFSHCD_QTI)
static int ufshcd_set_low_vcc_level(struct ufs_hba *hba)
{
int ret;
struct ufs_vreg *vreg = hba->vreg_info.vcc;
/* Check if device supports the low voltage VCC feature */
if (hba->dev_info.wspecversion < 0x300)
return 0;
/*
* Check if host has support for low VCC voltage?
* In addition, also check if we have already set the low VCC level
* or not?
*/
if (!vreg->low_voltage_sup || vreg->low_voltage_active)
return 0;
/* Put the device in sleep before lowering VCC level */
ret = ufshcd_set_dev_pwr_mode(hba, UFS_SLEEP_PWR_MODE);
/* Switch off VCC before switching it ON at 2.5v */
ret = ufshcd_disable_vreg(hba->dev, vreg);
/* add ~2ms delay before renabling VCC at lower voltage */
usleep_range(2000, 2100);
/* Now turn back VCC ON at low voltage */
vreg->low_voltage_active = true;
ret = ufshcd_enable_vreg(hba->dev, vreg);
/* Bring the device in active now */
ret = ufshcd_set_dev_pwr_mode(hba, UFS_ACTIVE_PWR_MODE);
return ret;
}
#endif
/**
* ufshcd_scsi_add_wlus - Adds required W-LUs
* @hba: per-adapter instance
@ -7711,6 +7752,10 @@ static int ufshcd_add_lus(struct ufs_hba *hba)
if (ret)
goto out;
#if defined(CONFIG_SCSI_UFSHCD_QTI)
ufshcd_set_low_vcc_level(hba);
#endif
/* Initialize devfreq after UFS device is detected */
if (ufshcd_is_clkscaling_supported(hba)) {
memcpy(&hba->clk_scaling.saved_pwr_info.info,
@ -8011,6 +8056,10 @@ static int ufshcd_config_vreg(struct device *dev,
if (vreg->min_uV && vreg->max_uV) {
min_uV = on ? vreg->min_uV : 0;
#if defined(CONFIG_SCSI_UFSHCD_QTI)
if (vreg->low_voltage_sup && !vreg->low_voltage_active && on)
min_uV = vreg->max_uV;
#endif
ret = regulator_set_voltage(reg, min_uV, vreg->max_uV);
if (ret) {
dev_err(dev,