Tune USB3.0 (PIPE3) PHY TX signal for high and supper
speed data transfer.
Signed-off-by: Anand Moon <linux.amoon@xxxxxxxxx>
---
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
