linux-kernel - [PATCH 08/11] phy: tegra: xusb: Disable trk clk when not using

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Date:   Mon, 24 Oct 2022 15:41:25 +0800
From:   Wayne Chang <waynec@...dia.com>
To:     <gregkh@...uxfoundation.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <treding@...dia.com>,
        <jonathanh@...dia.com>, <thierry.reding@...il.com>,
        <heikki.krogerus@...ux.intel.com>, <ajayg@...dia.com>,
        <kishon@...com>, <vkoul@...nel.org>, <p.zabel@...gutronix.de>,
        <balbi@...nel.org>, <mathias.nyman@...el.com>, <jckuo@...dia.com>
CC:     <waynec@...dia.com>, <linux-usb@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <singhanc@...dia.com>, <linux-i2c@...r.kernel.org>,
        <linux-phy@...ts.infradead.org>, <linux-tegra@...r.kernel.org>
Subject: [PATCH 08/11] phy: tegra: xusb: Disable trk clk when not using

The change fixes an issue that the pad tracking is a one-time calibration
for Tegra186 and Tegra194. We should disable the clk when it is done.
The 100us delay is for HW recording the calibration value.

Signed-off-by: Wayne Chang <waynec@...dia.com>
---
 drivers/phy/tegra/xusb-tegra186.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/tegra/xusb-tegra186.c b/drivers/phy/tegra/xusb-tegra186.c
index 0996ede63387..f121b4ffbbfd 100644
--- a/drivers/phy/tegra/xusb-tegra186.c
+++ b/drivers/phy/tegra/xusb-tegra186.c
@@ -609,6 +609,10 @@ static void tegra186_utmi_bias_pad_power_on(struct tegra_xusb_padctl *padctl)
 	value &= ~USB2_PD_TRK;
 	padctl_writel(padctl, value, XUSB_PADCTL_USB2_BIAS_PAD_CTL1);
 
+	udelay(100);
+
+	clk_disable_unprepare(priv->usb2_trk_clk);
+
 	mutex_unlock(&padctl->lock);
 }
 
@@ -633,8 +637,6 @@ static void tegra186_utmi_bias_pad_power_off(struct tegra_xusb_padctl *padctl)
 	value |= USB2_PD_TRK;
 	padctl_writel(padctl, value, XUSB_PADCTL_USB2_BIAS_PAD_CTL1);
 
-	clk_disable_unprepare(priv->usb2_trk_clk);
-
 	mutex_unlock(&padctl->lock);
 }
 
-- 
2.25.1