scsi: ufs: exynos: Ensure consistent phy reference counts

ufshcd_link_startup() can call ufshcd_vops_link_startup_notify()
multiple times when retrying. This causes the phy reference count to
keep increasing and the phy to not properly re-initialize.

If the phy has already been previously powered on, first issue a
phy_power_off() and phy_exit(), before re-initializing and powering on
again.

Signed-off-by: Peter Griffin <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Fixes: 3d73b20 ("scsi: ufs: ufs-exynos: Change ufs phy control sequence")
Cc: [email protected]
Reviewed-by: Bart Van Assche <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: petegriffin

drivers/ufs/host/ufs-exynos.c

@@ -962,6 +962,12 @@ static int exynos_ufs_phy_init(struct exynos_ufs *ufs)
 	}
 
 	phy_set_bus_width(generic_phy, ufs->avail_ln_rx);
+
+	if (generic_phy->power_count) {
+		phy_power_off(generic_phy);
+		phy_exit(generic_phy);
+	}
+
 	ret = phy_init(generic_phy);
 	if (ret) {
 		dev_err(hba->dev, "%s: phy init failed, ret = %d\n",