linux-kernel - [RFC/RFT 4/5] phy: exynos5-usbdrd: PIPE3 tune signal

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Message-Id: <20190722185938.9043-5-linux.amoon@gmail.com>
Date:   Tue, 23 Jul 2019 00:29:37 +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 4/5] phy: exynos5-usbdrd: PIPE3 tune signal

Tune USB3.0 (PIPE3) PHY TX signal for high and supper
speed data transfer.

Signed-off-by: Anand Moon <linux.amoon@...il.com>
---
 drivers/phy/samsung/phy-exynos5-usbdrd.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/phy/samsung/phy-exynos5-usbdrd.c b/drivers/phy/samsung/phy-exynos5-usbdrd.c
index 54a513ca15e4..4f16c4f82ae5 100644
--- a/drivers/phy/samsung/phy-exynos5-usbdrd.c
+++ b/drivers/phy/samsung/phy-exynos5-usbdrd.c
@@ -124,8 +124,10 @@
 
 #define EXYNOS5_DRD_PHYPARAM1			0x20
 
-#define PHYPARAM1_PCS_TXDEEMPH_MASK		(0x1f << 0)
-#define PHYPARAM1_PCS_TXDEEMPH			(0x1c)
+#define PHYPARAM1_TX0_TERM_OFFSET(x)		__set(x, 30, 26)
+#define PHYPARAM1_TX_SWING_FULL(x)		__set(x, 18, 12)
+#define PHYPRAAM1_PCS_TX_DEEMPH_6DB(x)		__set(x, 11, 6)
+#define PHYPRAAM1_PCS_TX_DEEMPH_3P5DB(x)	__set(x, 5, 0)
 
 #define EXYNOS5_DRD_PHYTERM			0x24
 
@@ -360,10 +362,16 @@ static void exynos5_usbdrd_pipe3_init(struct exynos5_usbdrd_phy *phy_drd)
 {
 	u32 reg;
 
-	reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM1);
 	/* Set Tx De-Emphasis level */
-	reg &= ~PHYPARAM1_PCS_TXDEEMPH_MASK;
-	reg |=	PHYPARAM1_PCS_TXDEEMPH;
+	reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM1);
+		/* Transmitter Termination Offset */
+	reg |=  PHYPARAM1_TX0_TERM_OFFSET(0x5) |
+		/* Tx Amplitude (Full Swing mode) */
+		PHYPARAM1_TX_SWING_FULL(0x3F) |
+		/* Tx De-Emphasis at 6 dB */
+		PHYPRAAM1_PCS_TX_DEEMPH_6DB(0x20) |
+		/* Tx De-Emphasis at 3.5 dB */
+		PHYPRAAM1_PCS_TX_DEEMPH_3P5DB(0x15);
 	writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM1);
 
 	reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST);
-- 
2.22.0