[PATCH RFT 4/5] phy: renesas: rcar-gen3-usb2: Assert PLL reset on PHY power off

From: Claudiu
Date: Wed Feb 19 2025 - 11:12:16 EST


From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>

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

Fixes: f3b5a8d9b50d ("phy: rcar-gen3-usb2: Add R-Car Gen3 USB2 PHY driver")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
---
drivers/phy/renesas/phy-rcar-gen3-usb2.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb2.c b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
index 5c0ceba09b67..087937407b0b 100644
--- a/drivers/phy/renesas/phy-rcar-gen3-usb2.c
+++ b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
@@ -537,9 +537,16 @@ static int rcar_gen3_phy_usb2_power_off(struct phy *p)
struct rcar_gen3_chan *channel = rphy->ch;
int ret = 0;

- scoped_guard(spinlock_irqsave, &channel->lock)
+ scoped_guard(spinlock_irqsave, &channel->lock) {
rphy->powered = false;

+ if (rcar_gen3_are_all_rphys_power_off(channel)) {
+ u32 val = readl(channel->base + USB2_USBCTR);
+ val |= USB2_USBCTR_PLL_RST;
+ writel(val, channel->base + USB2_USBCTR);
+ }
+ }
+
if (channel->vbus)
ret = regulator_disable(channel->vbus);

--
2.43.0