linux-kernel - [PATCH] phy: phy-mt65xx-usb3: fix test fail of HS receiver sensitivity

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Date:	Tue, 17 Nov 2015 14:02:58 +0800
From:	Chunfeng Yun <chunfeng.yun@...iatek.com>
To:	Kishon Vijay Abraham I <kishon@...com>
CC:	Chunfeng Yun <chunfeng.yun@...iatek.com>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-usb@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
	Daniel Kurtz <djkurtz@...omium.org>
Subject: [PATCH] phy: phy-mt65xx-usb3: fix test fail of HS receiver sensitivity

when use the default value 8 of RG_USB20_SQTH, the HS receiver
sensitivity test of HQA will fail, set it as 2 to fix up the
issue.

Change-Id: Ia5bdbbfc8ebb170d3ef26007e665b7350b6d28ab
Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
 drivers/phy/phy-mt65xx-usb3.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/phy-mt65xx-usb3.c b/drivers/phy/phy-mt65xx-usb3.c
index f30b28b..dc480d3 100644
--- a/drivers/phy/phy-mt65xx-usb3.c
+++ b/drivers/phy/phy-mt65xx-usb3.c
@@ -49,6 +49,8 @@
 #define PA6_RG_U2_ISO_EN		BIT(31)
 #define PA6_RG_U2_BC11_SW_EN		BIT(23)
 #define PA6_RG_U2_OTG_VBUSCMP_EN	BIT(20)
+#define PA6_RG_U2_SQTH		GENMASK(3, 0)
+#define PA6_RG_U2_SQTH_VAL(x)	(0xf & (x))
 
 #define U3P_U2PHYACR4		(SSUSB_SIFSLV_U2PHY_COM_BASE + 0x0020)
 #define P2C_RG_USB20_GPIO_CTL		BIT(9)
@@ -165,9 +167,10 @@ static void phy_instance_init(struct mt65xx_u3phy *u3phy,
 		writel(tmp, port_base + U3P_U2PHYDTM0);
 	}
 
-	/* DP/DM BC1.1 path Disable */
 	tmp = readl(port_base + U3P_USBPHYACR6);
-	tmp &= ~PA6_RG_U2_BC11_SW_EN;
+	tmp &= ~PA6_RG_U2_BC11_SW_EN;	/* DP/DM BC1.1 path Disable */
+	tmp &= ~PA6_RG_U2_SQTH;
+	tmp |= PA6_RG_U2_SQTH_VAL(2);
 	writel(tmp, port_base + U3P_USBPHYACR6);
 
 	tmp = readl(port_base + U3P_U3PHYA_DA_REG0);
-- 
1.8.1.1.dirty

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