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ufs: add voting support for host controller power

Browse source 
Add the support for voting of the regulator powering the
host controller logic.

Signed-off-by: Raviv Shvili <[email protected]>
Signed-off-by: Subhash Jadavani <[email protected]>
Signed-off-by: Dolev Raviv <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
This commit is contained in:
Raviv Shvili 2014-09-25 15:32:24 +03:00 • committed by Christoph Hellwig
commit 6a771a6560
4 changed files with 54 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

1
drivers/scsi/ufs/ufs.h
View file

@ -385,6 +385,7 @@ struct ufs_vreg_info {
struct ufs_vreg *vcc;
struct ufs_vreg *vccq;
struct ufs_vreg *vccq2;
struct ufs_vreg *vdd_hba;
};
#endif /* End of Header */

9
drivers/scsi/ufs/ufshcd-pltfrm.c
View file

@ -147,6 +147,11 @@ static int ufshcd_populate_vreg(struct device *dev, const char *name,
vreg->name = kstrdup(name, GFP_KERNEL);
/* if fixed regulator no need further initialization */
snprintf(prop_name, MAX_PROP_SIZE, "%s-fixed-regulator", name);
if (of_property_read_bool(np, prop_name))
goto out;
snprintf(prop_name, MAX_PROP_SIZE, "%s-max-microamp", name);
ret = of_property_read_u32(np, prop_name, &vreg->max_uA);
if (ret) {
@ -198,6 +203,10 @@ static int ufshcd_parse_regulator_info(struct ufs_hba *hba)
struct device *dev = hba->dev;
struct ufs_vreg_info *info = &hba->vreg_info;
err = ufshcd_populate_vreg(dev, "vdd-hba", &info->vdd_hba);
if (err)
goto out;
err = ufshcd_populate_vreg(dev, "vcc", &info->vcc);
if (err)
goto out;

42
drivers/scsi/ufs/ufshcd.c
View file

@ -3311,6 +3311,16 @@ out:
return ret;
}
static int ufshcd_setup_hba_vreg(struct ufs_hba *hba, bool on)
{
struct ufs_vreg_info *info = &hba->vreg_info;
if (info)
return ufshcd_toggle_vreg(hba->dev, info->vdd_hba, on);
return 0;
}
static int ufshcd_get_vreg(struct device *dev, struct ufs_vreg *vreg)
{
int ret = 0;
@ -3350,6 +3360,16 @@ out:
return ret;
}
static int ufshcd_init_hba_vreg(struct ufs_hba *hba)
{
struct ufs_vreg_info *info = &hba->vreg_info;
if (info)
return ufshcd_get_vreg(hba->dev, info->vdd_hba);
return 0;
}
static int ufshcd_setup_clocks(struct ufs_hba *hba, bool on)
{
int ret = 0;
@ -3483,14 +3503,29 @@ static int ufshcd_hba_init(struct ufs_hba *hba)
{
int err;
err = ufshcd_init_clocks(hba);
/*
* Handle host controller power separately from the UFS device power
* rails as it will help controlling the UFS host controller power
* collapse easily which is different than UFS device power collapse.
* Also, enable the host controller power before we go ahead with rest
* of the initialization here.
*/
err = ufshcd_init_hba_vreg(hba);
if (err)
goto out;
err = ufshcd_setup_clocks(hba, true);
err = ufshcd_setup_hba_vreg(hba, true);
if (err)
goto out;
err = ufshcd_init_clocks(hba);
if (err)
goto out_disable_hba_vreg;
err = ufshcd_setup_clocks(hba, true);
if (err)
goto out_disable_hba_vreg;
err = ufshcd_init_vreg(hba);
if (err)
goto out_disable_clks;
@ -3509,6 +3544,8 @@ out_disable_vreg:
ufshcd_setup_vreg(hba, false);
out_disable_clks:
ufshcd_setup_clocks(hba, false);
out_disable_hba_vreg:
ufshcd_setup_hba_vreg(hba, false);
out:
return err;
}
@ -3518,6 +3555,7 @@ static void ufshcd_hba_exit(struct ufs_hba *hba)
ufshcd_variant_hba_exit(hba);
ufshcd_setup_vreg(hba, false);
ufshcd_setup_clocks(hba, false);
ufshcd_setup_hba_vreg(hba, false);
}
/**