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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250219160749.1750797-5-claudiu.beznea.uj@bp.renesas.com>
Date: Wed, 19 Feb 2025 18:07:47 +0200
From: Claudiu <claudiu.beznea@...on.dev>
To: yoshihiro.shimoda.uh@...esas.com,
	vkoul@...nel.org,
	kishon@...nel.org,
	horms+renesas@...ge.net.au,
	fabrizio.castro@...renesas.com,
	robh@...nel.org
Cc: claudiu.beznea@...on.dev,
	linux-renesas-soc@...r.kernel.org,
	linux-phy@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>,
	stable@...r.kernel.org
Subject: [PATCH RFT 4/5] phy: renesas: rcar-gen3-usb2: Assert PLL reset on PHY power off

From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>

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@...r.kernel.org
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---
 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