linux-kernel - [PATCH] phy: phy-brcm-usb-init: Fix power down USB 3.0 PHY when XHCI reenabled

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Date:   Fri,  8 Jun 2018 15:10:15 +0900
From:   Jaedon Shin <jaedon.shin@...il.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Al Cooper <alcooperx@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        bcm-kernel-feedback-list@...adcom.com,
        Jaedon Shin <jaedon.shin@...il.com>
Subject: [PATCH] phy: phy-brcm-usb-init: Fix power down USB 3.0 PHY when XHCI reenabled

Unset is required to enable USB 3.0 PHY when XHCI reenabled in response
to setting PHY3_IDDQ_OVERRIDE in uninit().

Fixes: cd6f769fdea7 ("phy: phy-brcm-usb-init: Power down USB 3.0 PHY when XHCI disabled")
Signed-off-by: Jaedon Shin <jaedon.shin@...il.com>
---
 drivers/phy/broadcom/phy-brcm-usb-init.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/phy/broadcom/phy-brcm-usb-init.c b/drivers/phy/broadcom/phy-brcm-usb-init.c
index 1b7febc43da9..29d2c3b1913a 100644
--- a/drivers/phy/broadcom/phy-brcm-usb-init.c
+++ b/drivers/phy/broadcom/phy-brcm-usb-init.c
@@ -962,6 +962,10 @@ void brcm_usb_init_xhci(struct brcm_usb_init_params *params)
 {
 	void __iomem *ctrl = params->ctrl_regs;
 
+	USB_CTRL_UNSET(ctrl, USB30_PCTL, PHY3_IDDQ_OVERRIDE);
+	/* 1 millisecond - for USB clocks to settle down */
+	usleep_range(1000, 2000);
+
 	if (BRCM_ID(params->family_id) == 0x7366) {
 		/*
 		 * The PHY3_SOFT_RESETB bits default to the wrong state.
-- 
2.17.1