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Subject[RFC/RFT 2/5] phy: exynos5-usbdrd: add missing tuning of the phyutmi signal
Date
Add missing tuning of phyutmi controls to enter suspend and
resume state.

Signed-off-by: Anand Moon <linux.amoon@gmail.com>
---
drivers/phy/samsung/phy-exynos5-usbdrd.c | 32 ++++++++++++++++++++++--
1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/samsung/phy-exynos5-usbdrd.c b/drivers/phy/samsung/phy-exynos5-usbdrd.c
index 3c14bf7718c1..135114d51bc1 100644
--- a/drivers/phy/samsung/phy-exynos5-usbdrd.c
+++ b/drivers/phy/samsung/phy-exynos5-usbdrd.c
@@ -42,7 +42,13 @@

#define EXYNOS5_DRD_PHYUTMI 0x08

+#define PHYUTMI_TXBITSTUFFENH BIT(8)
+#define PHYUTMI_TXBITSTUFFEN BIT(7)
#define PHYUTMI_OTGDISABLE BIT(6)
+#define PHYUTMI_IDPULLUP BIT(5)
+#define PHYUTMI_DRVVBUS BIT(4)
+#define PHYUTMI_DPPULLDOWN BIT(3)
+#define PHYUTMI_DMPULLDOWN BIT(2)
#define PHYUTMI_FORCESUSPEND BIT(1)
#define PHYUTMI_FORCESLEEP BIT(0)

@@ -402,6 +408,23 @@ static int exynos5_usbdrd_phy_init(struct phy *phy)
LINKSYSTEM_FLADJ(0x20);
writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_LINKSYSTEM);

+ reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYUTMI);
+ /* High-Byte Transmit Bit-Stuffing Enable */
+ reg |= PHYUTMI_TXBITSTUFFENH;
+ /* Low-Byte Transmit Bit-Stuffing Enable */
+ reg |= PHYUTMI_TXBITSTUFFEN;
+ /* release force_sleep & force_suspend */
+ reg &= ~(PHYUTMI_FORCESLEEP | PHYUTMI_FORCESUSPEND);
+ /* DP/DM Pull Down Disable */
+ reg &= ~(PHYUTMI_DMPULLDOWN | PHYUTMI_DPPULLDOWN);
+ /* drvvbus controller signal controls the VBUS valid comparator */
+ reg &= ~PHYUTMI_OTGDISABLE;
+ /* controller signal controls the VBUS Valid comparator */
+ reg |= PHYUTMI_DRVVBUS;
+ /* Enable ID Sampling */
+ reg |= PHYUTMI_IDPULLUP;
+ writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYUTMI);
+
reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM0);
/* Select PHY CLK source */
reg &= ~PHYPARAM0_REF_USE_PAD;
@@ -452,9 +475,14 @@ static int exynos5_usbdrd_phy_exit(struct phy *phy)
if (ret)
return ret;

- reg = PHYUTMI_OTGDISABLE |
+ reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYUTMI);
+ reg |= PHYUTMI_OTGDISABLE |
PHYUTMI_FORCESUSPEND |
- PHYUTMI_FORCESLEEP;
+ PHYUTMI_FORCESLEEP |
+ PHYUTMI_DMPULLDOWN |
+ PHYUTMI_DPPULLDOWN;
+ reg &= ~(PHYUTMI_DRVVBUS | PHYUTMI_IDPULLUP |
+ PHYUTMI_TXBITSTUFFENH | PHYUTMI_TXBITSTUFFEN);
writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYUTMI);

/* Resetting the PHYCLKRST enable bits to reduce leakage current */
--
2.22.0
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