linux-kernel - [PATCH v3 4/5] phy: renesas: rcar-gen3-usb2: Assert PLL reset on PHY power off

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Message-ID: <20250304104826.4173394-5-claudiu.beznea.uj@bp.renesas.com>
Date: Tue,  4 Mar 2025 12:48:25 +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.jz@...esas.com
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,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH v3 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
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
---

Changes in v3:
- collected tags

Changes in v2:
- collected tags
- add an empty line after definition of val to get rid of
  the checkpatch.pl warning

 drivers/phy/renesas/phy-rcar-gen3-usb2.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/renesas/phy-rcar-gen3-usb2.c b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
index 39c73399b039..c663910d6163 100644
--- a/drivers/phy/renesas/phy-rcar-gen3-usb2.c
+++ b/drivers/phy/renesas/phy-rcar-gen3-usb2.c
@@ -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);
 
-- 
2.43.0