[ Upstream commit 3b141e8cfd54ba3e5c610717295b2a02aab26a05 ]
For regulators used by UFS, vcc, vccq and vccq2 will have voltage range initialized by ufshcd_populate_vreg(), however other regulators may have undefined voltage range if dt-bindings have no such definition.
In above undefined case, both "min_uV" and "max_uV" fields in ufs_vreg struct will be zero values and these values will be configured on regulators in different power modes.
Currently this may have no harm if both "min_uV" and "max_uV" always keep "zero values" because regulator_set_voltage() will always bypass such invalid values and return "good" results.
However improper values shall be fixed to avoid potential bugs. Simply bypass voltage configuration if voltage range is not defined.
Signed-off-by: Stanley Chu stanley.chu@mediatek.com Reviewed-by: Avri Altman avri.altman@wdc.com Acked-by: Alim Akhtar alim.akhtar@samsung.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/ufs/ufshcd.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index c2395b8e72894..d8f0a1ccd9b19 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -6580,12 +6580,15 @@ static int ufshcd_config_vreg(struct device *dev, name = vreg->name;
if (regulator_count_voltages(reg) > 0) { - min_uV = on ? vreg->min_uV : 0; - ret = regulator_set_voltage(reg, min_uV, vreg->max_uV); - if (ret) { - dev_err(dev, "%s: %s set voltage failed, err=%d\n", + if (vreg->min_uV && vreg->max_uV) { + min_uV = on ? vreg->min_uV : 0; + ret = regulator_set_voltage(reg, min_uV, vreg->max_uV); + if (ret) { + dev_err(dev, + "%s: %s set voltage failed, err=%d\n", __func__, name, ret); - goto out; + goto out; + } }
uA_load = on ? vreg->max_uA : 0;