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

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[ Upstream commit 9ce71e85b29eb63e48e294479742e670513f03a0 ]

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

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: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Claudiu Beznea
2025-05-07 15:50:31 +03:00
committed by Greg Kroah-Hartman
parent cf60d19721
commit 1efbe2c7a0
1 changed files with 9 additions and 1 deletions
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10
drivers/phy/renesas/phy-rcar-gen3-usb2.c
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@@ -537,9 +537,17 @@ 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);