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scsi: ufs: disable vccq if it's not needed by UFS device

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Some UFS devices don't require VCCQ rail for device operations hence
this change adds support to recognize such devices and remove vote for
the unused VCCQ rail.

Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Yaniv Gardi 2016-03-10 17:37:11 +02:00 committed by Martin K. Petersen
parent c58ab7aab7
commit 60f0187031
2 changed files with 57 additions and 4 deletions
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1
drivers/scsi/ufs/ufs.h
View File

@ -501,6 +501,7 @@ struct ufs_vreg {
struct regulator *reg;
const char *name;
bool enabled;
bool unused;
int min_uV;
int max_uV;
int min_uA;

60
drivers/scsi/ufs/ufshcd.c
View File

@ -195,6 +195,7 @@ static int ufshcd_probe_hba(struct ufs_hba *hba);
static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
bool skip_ref_clk);
static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on);
static int ufshcd_set_vccq_rail_unused(struct ufs_hba *hba, bool unused);
static int ufshcd_uic_hibern8_exit(struct ufs_hba *hba);
static int ufshcd_uic_hibern8_enter(struct ufs_hba *hba);
static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba);
@ -4662,6 +4663,12 @@ static int ufshcd_probe_hba(struct ufs_hba *hba)
goto out;
ufs_advertise_fixup_device(hba);
ret = ufshcd_set_vccq_rail_unused(hba,
(hba->dev_quirks & UFS_DEVICE_NO_VCCQ) ? true : false);
if (ret)
goto out;
/* UFS device is also active now */
ufshcd_set_ufs_dev_active(hba);
ufshcd_force_reset_auto_bkops(hba);
@ -4812,13 +4819,24 @@ static int ufshcd_config_vreg_load(struct device *dev, struct ufs_vreg *vreg,
static inline int ufshcd_config_vreg_lpm(struct ufs_hba *hba,
struct ufs_vreg *vreg)
{
return ufshcd_config_vreg_load(hba->dev, vreg, UFS_VREG_LPM_LOAD_UA);
if (!vreg)
return 0;
else if (vreg->unused)
return 0;
else
return ufshcd_config_vreg_load(hba->dev, vreg,
UFS_VREG_LPM_LOAD_UA);
}
static inline int ufshcd_config_vreg_hpm(struct ufs_hba *hba,
struct ufs_vreg *vreg)
{
return ufshcd_config_vreg_load(hba->dev, vreg, vreg->max_uA);
if (!vreg)
return 0;
else if (vreg->unused)
return 0;
else
return ufshcd_config_vreg_load(hba->dev, vreg, vreg->max_uA);
}
static int ufshcd_config_vreg(struct device *dev,
@ -4853,7 +4871,9 @@ static int ufshcd_enable_vreg(struct device *dev, struct ufs_vreg *vreg)
{
int ret = 0;
if (!vreg || vreg->enabled)
if (!vreg)
goto out;
else if (vreg->enabled || vreg->unused)
goto out;
ret = ufshcd_config_vreg(dev, vreg, true);
@ -4873,7 +4893,9 @@ static int ufshcd_disable_vreg(struct device *dev, struct ufs_vreg *vreg)
{
int ret = 0;
if (!vreg || !vreg->enabled)
if (!vreg)
goto out;
else if (!vreg->enabled || vreg->unused)
goto out;
ret = regulator_disable(vreg->reg);
@ -4979,6 +5001,36 @@ static int ufshcd_init_hba_vreg(struct ufs_hba *hba)
return 0;
}
static int ufshcd_set_vccq_rail_unused(struct ufs_hba *hba, bool unused)
{
int ret = 0;
struct ufs_vreg_info *info = &hba->vreg_info;
if (!info)
goto out;
else if (!info->vccq)
goto out;
if (unused) {
/* shut off the rail here */
ret = ufshcd_toggle_vreg(hba->dev, info->vccq, false);
/*
* Mark this rail as no longer used, so it doesn't get enabled
* later by mistake
*/
if (!ret)
info->vccq->unused = true;
} else {
/*
* rail should have been already enabled hence just make sure
* that unused flag is cleared.
*/
info->vccq->unused = false;
}
out:
return ret;
}
static int __ufshcd_setup_clocks(struct ufs_hba *hba, bool on,
bool skip_ref_clk)
{