scsi: ufs: exynos: Ensure consistent phy reference counts

commit 7f05fd9a upstream.

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 <peter.griffin@linaro.org>
Link: https://lore.kernel.org/r/20250319-exynos-ufs-stability-fixes-v2-4-96722cc2ba1b@linaro.org


Fixes: 3d73b200 ("scsi: ufs: ufs-exynos: Change ufs phy control sequence")
Cc: stable@vger.kernel.org
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>