linux-kernel - [PATCH 2/2] usb: gadget: tegra: Reduce pad power

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Message-ID: <20220815144449.9525-3-jilin@nvidia.com>
Date:   Mon, 15 Aug 2022 22:44:49 +0800
From:   Jim Lin <jilin@...dia.com>
To:     <jckuo@...dia.com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>
CC:     <kishon@...com>, <vkoul@...nel.org>, <balbi@...nel.org>,
        <gregkh@...uxfoundation.org>, <jilin@...dia.com>,
        <bhsieh@...dia.com>, <linux-phy@...ts.infradead.org>,
        <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-usb@...r.kernel.org>
Subject: [PATCH 2/2] usb: gadget: tegra: Reduce pad power

Program USB2 UTMI pad PD controls during port connect/disconnect.
Power down pad after disconnected to save power.

Signed-off-by: Jim Lin <jilin@...dia.com>
---
 drivers/usb/gadget/udc/tegra-xudc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/gadget/udc/tegra-xudc.c b/drivers/usb/gadget/udc/tegra-xudc.c
index 43f1b0d461c1..f03bed263922 100644
--- a/drivers/usb/gadget/udc/tegra-xudc.c
+++ b/drivers/usb/gadget/udc/tegra-xudc.c
@@ -703,6 +703,8 @@ static void tegra_xudc_device_mode_on(struct tegra_xudc *xudc)
 
 	pm_runtime_get_sync(xudc->dev);
 
+	tegra_phy_xusb_utmi_pad_power_on(xudc->curr_utmi_phy);
+
 	err = phy_power_on(xudc->curr_utmi_phy);
 	if (err < 0)
 		dev_err(xudc->dev, "UTMI power on failed: %d\n", err);
@@ -757,6 +759,8 @@ static void tegra_xudc_device_mode_off(struct tegra_xudc *xudc)
 	/* Make sure interrupt handler has completed before powergating. */
 	synchronize_irq(xudc->irq);
 
+	tegra_phy_xusb_utmi_pad_power_down(xudc->curr_utmi_phy);
+
 	err = phy_power_off(xudc->curr_utmi_phy);
 	if (err < 0)
 		dev_err(xudc->dev, "UTMI PHY power off failed: %d\n", err);
-- 
2.17.1