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Claudiu Beznea a92895447e phy: renesas: rcar-gen3-usb2: Assert PLL reset on PHY power off

commit 9ce71e85b2 upstream.

Assert PLL reset on PHY power off. This saves power.

[claudiu.beznea: fixed conflict in rcar_gen3_phy_usb2_power_off() by
 using spin_lock_irqsave()/spin_unlock_irqrestore() instead of
 scoped_guard()]

Fixes: f3b5a8d9b5 ("phy: rcar-gen3-usb2: Add R-Car Gen3 USB2 PHY driver")
Cc: stable@vger.kernel.org
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Link: https://lore.kernel.org/r/20250507125032.565017-5-claudiu.beznea.uj@bp.renesas.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>