From 6f0577d1411337a0d97d545abe4a784e9e611516 Mon Sep 17 00:00:00 2001
From: Bharat Gooty <bharat.gooty@broadcom.com>
Date: Wed, 13 May 2020 23:09:47 +0530
Subject: [PATCH] drivers: phy: sr-usb: do not use internal fsm for USB2 phy init
Git-commit: 6f0577d1411337a0d97d545abe4a784e9e611516
Patch-mainline: v5.8-rc1
References: git-fixes
During different reboot cycles, USB PHY PLL may not always lock
during initialization and therefore can cause USB to be not usable.
Hence do not use internal FSM programming sequence for the USB
PHY initialization.
Fixes: 4dcddbb38b64 ("phy: sr-usb: Add Stingray USB PHY driver")
Signed-off-by: Bharat Gooty <bharat.gooty@broadcom.com>
Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur@broadcom.com>
Link: https://lore.kernel.org/r/20200513173947.10919-1-rayagonda.kokatanur@broadcom.com
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/phy/broadcom/phy-bcm-sr-usb.c | 55 ++---------------------------------
1 file changed, 2 insertions(+), 53 deletions(-)
diff --git a/drivers/phy/broadcom/phy-bcm-sr-usb.c b/drivers/phy/broadcom/phy-bcm-sr-usb.c
index e04be8f52744..77c025a0720c 100644
--- a/drivers/phy/broadcom/phy-bcm-sr-usb.c
+++ b/drivers/phy/broadcom/phy-bcm-sr-usb.c
@@ -16,8 +16,6 @@ enum bcm_usb_phy_version {
};
enum bcm_usb_phy_reg {
- PLL_NDIV_FRAC,
- PLL_NDIV_INT,
PLL_CTRL,
PHY_CTRL,
PHY_PLL_CTRL,
@@ -31,18 +29,11 @@ static const u8 bcm_usb_combo_phy_ss[] = {
};
static const u8 bcm_usb_combo_phy_hs[] = {
- [PLL_NDIV_FRAC] = 0x04,
- [PLL_NDIV_INT] = 0x08,
[PLL_CTRL] = 0x0c,
[PHY_CTRL] = 0x10,
};
-#define HSPLL_NDIV_INT_VAL 0x13
-#define HSPLL_NDIV_FRAC_VAL 0x1005
-
static const u8 bcm_usb_hs_phy[] = {
- [PLL_NDIV_FRAC] = 0x0,
- [PLL_NDIV_INT] = 0x4,
[PLL_CTRL] = 0x8,
[PHY_CTRL] = 0xc,
};
@@ -52,7 +43,6 @@ enum pll_ctrl_bits {
SSPLL_SUSPEND_EN,
PLL_SEQ_START,
PLL_LOCK,
- PLL_PDIV,
};
static const u8 u3pll_ctrl[] = {
@@ -66,29 +56,17 @@ static const u8 u3pll_ctrl[] = {
#define HSPLL_PDIV_VAL 0x1
static const u8 u2pll_ctrl[] = {
- [PLL_PDIV] = 1,
[PLL_RESETB] = 5,
[PLL_LOCK] = 6,
};
enum bcm_usb_phy_ctrl_bits {
CORERDY,
- AFE_LDO_PWRDWNB,
- AFE_PLL_PWRDWNB,
- AFE_BG_PWRDWNB,
- PHY_ISO,
PHY_RESETB,
PHY_PCTL,
};
#define PHY_PCTL_MASK 0xffff
-/*
- * 0x0806 of PCTL_VAL has below bits set
- * BIT-8 : refclk divider 1
- * BIT-3:2: device mode; mode is not effect
- * BIT-1: soft reset active low
- */
-#define HSPHY_PCTL_VAL 0x0806
#define SSPHY_PCTL_VAL 0x0006
static const u8 u3phy_ctrl[] = {
@@ -98,10 +76,6 @@ static const u8 u3phy_ctrl[] = {
static const u8 u2phy_ctrl[] = {
[CORERDY] = 0,
- [AFE_LDO_PWRDWNB] = 1,
- [AFE_PLL_PWRDWNB] = 2,
- [AFE_BG_PWRDWNB] = 3,
- [PHY_ISO] = 4,
[PHY_RESETB] = 5,
[PHY_PCTL] = 6,
};
@@ -186,38 +160,13 @@ static int bcm_usb_hs_phy_init(struct bcm_usb_phy_cfg *phy_cfg)
int ret = 0;
void __iomem *regs = phy_cfg->regs;
const u8 *offset;
- u32 rd_data;
offset = phy_cfg->offset;
- writel(HSPLL_NDIV_INT_VAL, regs + offset[PLL_NDIV_INT]);
- writel(HSPLL_NDIV_FRAC_VAL, regs + offset[PLL_NDIV_FRAC]);
-
- rd_data = readl(regs + offset[PLL_CTRL]);
- rd_data &= ~(HSPLL_PDIV_MASK << u2pll_ctrl[PLL_PDIV]);
- rd_data |= (HSPLL_PDIV_VAL << u2pll_ctrl[PLL_PDIV]);
- writel(rd_data, regs + offset[PLL_CTRL]);
-
- /* Set Core Ready high */
- bcm_usb_reg32_setbits(regs + offset[PHY_CTRL],
- BIT(u2phy_ctrl[CORERDY]));
-
- /* Maximum timeout for Core Ready done */
- msleep(30);
-
+ bcm_usb_reg32_clrbits(regs + offset[PLL_CTRL],
+ BIT(u2pll_ctrl[PLL_RESETB]));
bcm_usb_reg32_setbits(regs + offset[PLL_CTRL],
BIT(u2pll_ctrl[PLL_RESETB]));
- bcm_usb_reg32_setbits(regs + offset[PHY_CTRL],
- BIT(u2phy_ctrl[PHY_RESETB]));
-
-
- rd_data = readl(regs + offset[PHY_CTRL]);
- rd_data &= ~(PHY_PCTL_MASK << u2phy_ctrl[PHY_PCTL]);
- rd_data |= (HSPHY_PCTL_VAL << u2phy_ctrl[PHY_PCTL]);
- writel(rd_data, regs + offset[PHY_CTRL]);
-
- /* Maximum timeout for PLL reset done */
- msleep(30);
ret = bcm_usb_pll_lock_check(regs + offset[PLL_CTRL],
BIT(u2pll_ctrl[PLL_LOCK]));
--
2.16.4