linux-kernel - [PATCH v1] usb: phy: generic: add suspend support for regulator

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Message-Id: <20231027122955.22123-1-francesco@dolcini.it>
Date:   Fri, 27 Oct 2023 14:29:55 +0200
From:   Francesco Dolcini <francesco@...cini.it>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Stefan Eichenberger <stefan.eichenberger@...adex.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Francesco Dolcini <francesco.dolcini@...adex.com>
Subject: [PATCH v1] usb: phy: generic: add suspend support for regulator

From: Stefan Eichenberger <stefan.eichenberger@...adex.com>

Disable the vcc regulator on suspend and enable it on resume.

Signed-off-by: Stefan Eichenberger <stefan.eichenberger@...adex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@...adex.com>
---
 drivers/usb/phy/phy-generic.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/phy/phy-generic.c b/drivers/usb/phy/phy-generic.c
index 770081b828a4..9ab50f26db60 100644
--- a/drivers/usb/phy/phy-generic.c
+++ b/drivers/usb/phy/phy-generic.c
@@ -46,15 +46,21 @@ EXPORT_SYMBOL_GPL(usb_phy_generic_unregister);
 static int nop_set_suspend(struct usb_phy *x, int suspend)
 {
 	struct usb_phy_generic *nop = dev_get_drvdata(x->dev);
+	int ret = 0;
 
-	if (!IS_ERR(nop->clk)) {
-		if (suspend)
+	if (suspend) {
+		if (!IS_ERR(nop->clk))
 			clk_disable_unprepare(nop->clk);
-		else
+		if (!IS_ERR(nop->vcc) && !device_may_wakeup(x->dev))
+			ret = regulator_disable(nop->vcc);
+	} else {
+		if (!IS_ERR(nop->vcc) && !device_may_wakeup(x->dev))
+			ret = regulator_enable(nop->vcc);
+		if (!IS_ERR(nop->clk))
 			clk_prepare_enable(nop->clk);
 	}
 
-	return 0;
+	return ret;
 }
 
 static void nop_reset(struct usb_phy_generic *nop)
-- 
2.25.1