4.17-stable review patch. If anyone has any objections, please let me know.
------------------
From: Subhash Jadavani <subhashj@xxxxxxxxxxxxxx>
[ Upstream commit b334456ec2021b1addc19806990115e69ec4ac32 ]
Vendor specific setup_clocks ops may depend on clocks managed by ufshcd
driver so if the vendor specific setup_clocks callback is called when
the required clocks are turned off, it results into unclocked register
access.
This change make sure that required clocks are enabled before vendor
specific setup_clocks callback is called.
Signed-off-by: Subhash Jadavani <subhashj@xxxxxxxxxxxxxx>
Signed-off-by: Venkat Gopalakrishnan <venkatg@xxxxxxxxxxxxxx>
Signed-off-by: Can Guo <cang@xxxxxxxxxxxxxx>
Signed-off-by: Asutosh Das <asutoshd@xxxxxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/ufs/ufshcd.c | 26 ++++++++++++++++++++------
1 file changed, 20 insertions(+), 6 deletions(-)
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -6799,9 +6799,16 @@ static int __ufshcd_setup_clocks(struct
if (list_empty(head))
goto out;
- ret = ufshcd_vops_setup_clocks(hba, on, PRE_CHANGE);
- if (ret)
- return ret;
+ /*
+ * vendor specific setup_clocks ops may depend on clocks managed by
+ * this standard driver hence call the vendor specific setup_clocks
+ * before disabling the clocks managed here.
+ */
+ if (!on) {
+ ret = ufshcd_vops_setup_clocks(hba, on, PRE_CHANGE);
+ if (ret)
+ return ret;
+ }
list_for_each_entry(clki, head, list) {
if (!IS_ERR_OR_NULL(clki->clk)) {
@@ -6825,9 +6832,16 @@ static int __ufshcd_setup_clocks(struct
}
}
- ret = ufshcd_vops_setup_clocks(hba, on, POST_CHANGE);
- if (ret)
- return ret;
+ /*
+ * vendor specific setup_clocks ops may depend on clocks managed by
+ * this standard driver hence call the vendor specific setup_clocks
+ * after enabling the clocks managed here.
+ */
+ if (on) {
+ ret = ufshcd_vops_setup_clocks(hba, on, POST_CHANGE);
+ if (ret)
+ return ret;
+ }
out:
if (ret) {
