linux-kernel - [RFC/RFT 3/5] phy: exynos5-usbdrd: UTMI tune signal

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Message-Id: <20190722185938.9043-4-linux.amoon@gmail.com>
Date:   Tue, 23 Jul 2019 00:29:36 +0530
From:   Anand Moon <linux.amoon@...il.com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Anand Moon <linux.amoon@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: [RFC/RFT 3/5] phy: exynos5-usbdrd: UTMI tune signal

Tune USB2.0 (UTMI+) TX signal for high speed data transfer.

Signed-off-by: Anand Moon <linux.amoon@...il.com>
---
 drivers/phy/samsung/phy-exynos5-usbdrd.c | 42 +++++++++++++++++++++---
 1 file changed, 37 insertions(+), 5 deletions(-)

diff --git a/drivers/phy/samsung/phy-exynos5-usbdrd.c b/drivers/phy/samsung/phy-exynos5-usbdrd.c
index 135114d51bc1..54a513ca15e4 100644
--- a/drivers/phy/samsung/phy-exynos5-usbdrd.c
+++ b/drivers/phy/samsung/phy-exynos5-usbdrd.c
@@ -33,6 +33,8 @@
 #define EXYNOS5_FSEL_24MHZ		0x5
 #define EXYNOS5_FSEL_50MHZ		0x7
 
+#define __set(v, a, b)  (((v) << (b)) & GENMASK(a, b))
+
 /* EXYNOS5: USB 3.0 DRD PHY registers */
 #define EXYNOS5_DRD_LINKSYSTEM			0x04
 
@@ -108,8 +110,17 @@
 #define EXYNOS5_DRD_PHYPARAM0			0x1c
 
 #define PHYPARAM0_REF_USE_PAD			BIT(31)
-#define PHYPARAM0_REF_LOSLEVEL_MASK		(0x1f << 26)
-#define PHYPARAM0_REF_LOSLEVEL			(0x9 << 26)
+#define PHYPARAM0_REF_LOSLEVEL(x)		__set(x, 30, 26)
+#define PHYPARAM0_TXVREFTUNE(x)			__set(x, 25, 22)
+#define PHYPARAM0_TXISETUNE(x)			__set(x, 21, 20)
+#define PHYPARAM0_TXRESTUNE(x)			__set(x, 19, 18)
+#define PHYPARAM0_TXPREEMPPULSETUNE		BIT(17)
+#define PHYPARAM0_TXPREEMPAMPTUNE(x)		__set(x, 16, 15)
+#define PHYPARAM0_TXHSXVTUNE(x)			__set(x, 14, 13)
+#define PHYPARAM0_TXFSLSTUNE(x)			__set(x, 12, 9)
+#define PHYPARAM0_SQRXTUNE(x)			__set(x, 8, 6)
+#define PHYPARAM0_OTGTUNE(x)			__set(x, 5, 3)
+#define PHYPARAM0_COMPDISTUNE(x)		__set(x, 2, 0)
 
 #define EXYNOS5_DRD_PHYPARAM1			0x20
 
@@ -365,9 +376,30 @@ static void exynos5_usbdrd_utmi_init(struct exynos5_usbdrd_phy *phy_drd)
 	u32 reg;
 
 	reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM0);
-	/* Set Loss-of-Signal Detector sensitivity */
-	reg &= ~PHYPARAM0_REF_LOSLEVEL_MASK;
-	reg |=	PHYPARAM0_REF_LOSLEVEL;
+		/* Set Loss-of-Signal Detector sensitivity */
+	reg |= (PHYPARAM0_REF_USE_PAD |
+		/* Sets the sensitivity level for the Loss-of-Signal detector */
+		PHYPARAM0_REF_LOSLEVEL(0x9) |
+		/* Adjusts the high-speed DC level voltage */
+		PHYPARAM0_TXVREFTUNE(0x3) |
+		/* Adjust the rise/fal timie of the high-speed waveform */
+		PHYPARAM0_TXISETUNE(0x1) |
+		/* Adjusts the driver source impedance */
+		PHYPARAM0_TXRESTUNE(0x1) |
+		/* HS Transmitter Pre-Emphasis Duration Control */
+		PHYPARAM0_TXPREEMPPULSETUNE |
+		/* HS Transmitter Pre-Emphasis Current Control */
+		PHYPARAM0_TXPREEMPAMPTUNE(0x0) |
+		/* Transmitter High-Speed Crossover Adjustment */
+		PHYPARAM0_TXHSXVTUNE(0x3) |
+		/* FS/LS Source Impedance Adjustment */
+		PHYPARAM0_TXFSLSTUNE(0x3) |
+		/* Squelch Threshold Adjustment */
+		PHYPARAM0_SQRXTUNE(0x3) |
+		/* VBUS Valid Threshold Adjustment */
+		PHYPARAM0_OTGTUNE(0x6) |
+		/* Disconnect Threshold Adjustment */
+		PHYPARAM0_COMPDISTUNE(0x6));
 	writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM0);
 
 	reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM1);
-- 
2.22.0