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authorRaviv Shvili <rshvili@codeaurora.org>2014-09-25 14:32:24 +0200
committerChristoph Hellwig <hch@lst.de>2014-10-01 13:11:20 +0200
commit6a771a656041f404fae143e5d753d37f5c0688e7 (patch)
tree13596a256da37823e27f83998c5698e0cbaf0c87 /drivers/scsi
parentufs: Add clock initialization support (diff)
downloadlinux-6a771a656041f404fae143e5d753d37f5c0688e7.tar.xz
linux-6a771a656041f404fae143e5d753d37f5c0688e7.zip
ufs: add voting support for host controller power
Add the support for voting of the regulator powering the host controller logic. Signed-off-by: Raviv Shvili <rshvili@codeaurora.org> Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org> Signed-off-by: Dolev Raviv <draviv@codeaurora.org> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/ufs/ufs.h1
-rw-r--r--drivers/scsi/ufs/ufshcd-pltfrm.c9
-rw-r--r--drivers/scsi/ufs/ufshcd.c42
3 files changed, 50 insertions, 2 deletions
diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
index 729ce7d62d1e..9bb691962c47 100644
--- a/drivers/scsi/ufs/ufs.h
+++ b/drivers/scsi/ufs/ufs.h
@@ -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 */
diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
index 642d80fe1f80..dde4e6e3be70 100644
--- a/drivers/scsi/ufs/ufshcd-pltfrm.c
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
@@ -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;
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index b03370292070..26301b8325e8 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -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);
}
/**