scsi: ufs: ufs-qcom: Enter and exit hibern8 during clock scaling

Qualcomm controller needs to be in hibern8 before scaling clocks.  This
change puts the controller in hibern8 state before scaling and brings it
out after scaling of clocks.

Link: https://lore.kernel.org/r/212b7aaf6d834c4a8c682fdac4a59b84013ed573.1632818942.git.nguyenb@codeaurora.org
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 92d4c61..92f5bb4 100644 (file)
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -1212,24 +1212,34 @@ static int ufs_qcom_clk_scale_notify(struct ufs_hba *hba,
        int err = 0;
 
        if (status == PRE_CHANGE) {
+               err = ufshcd_uic_hibern8_enter(hba);
+               if (err)
+                       return err;
                if (scale_up)
                        err = ufs_qcom_clk_scale_up_pre_change(hba);
                else
                        err = ufs_qcom_clk_scale_down_pre_change(hba);
+               if (err)
+                       ufshcd_uic_hibern8_exit(hba);
+
        } else {
                if (scale_up)
                        err = ufs_qcom_clk_scale_up_post_change(hba);
                else
                        err = ufs_qcom_clk_scale_down_post_change(hba);
 
-               if (err || !dev_req_params)
+
+               if (err || !dev_req_params) {
+                       ufshcd_uic_hibern8_exit(hba);
                        goto out;
+               }
 
                ufs_qcom_cfg_timers(hba,
                                    dev_req_params->gear_rx,
                                    dev_req_params->pwr_rx,
                                    dev_req_params->hs_rate,
                                    false);
+               ufshcd_uic_hibern8_exit(hba);
        }
 
 out: