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From bed63b636fedf47dbab899a5193ec5ec4539f6fc Mon Sep 17 00:00:00 2001
From: Al Cooper <alcooperx@gmail.com>
Date: Fri, 3 Jan 2020 13:18:09 -0500
Subject: [PATCH] phy: usb: bdc: Fix occasional failure with BDC on 7211
The BDC "Read Transaction Size" needs to be changed from 1024
bytes to 256 bytes to prevent occasional transaction failures.
Signed-off-by: Al Cooper <alcooperx@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
.../phy/broadcom/phy-brcm-usb-init-synopsys.c | 18 +++++++++++++++
drivers/phy/broadcom/phy-brcm-usb-init.h | 1 +
drivers/phy/broadcom/phy-brcm-usb.c | 23 +++++++++++++++----
3 files changed, 38 insertions(+), 4 deletions(-)
--- a/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c
+++ b/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c
@@ -70,6 +70,11 @@
#define USB_GMDIOCSR 0
#define USB_GMDIOGEN 4
+/* Register definitions for the BDC EC block in 7211b0 */
+#define BDC_EC_AXIRDA 0x0c
+#define BDC_EC_AXIRDA_RTS_MASK 0xf0000000
+#define BDC_EC_AXIRDA_RTS_SHIFT 28
+
static void usb_mdio_write_7211b0(struct brcm_usb_init_params *params,
uint8_t addr, uint16_t data)
@@ -198,6 +203,7 @@ static void usb_init_common_7211b0(struc
{
void __iomem *ctrl = params->regs[BRCM_REGS_CTRL];
void __iomem *usb_phy = params->regs[BRCM_REGS_USB_PHY];
+ void __iomem *bdc_ec = params->regs[BRCM_REGS_BDC_EC];
int timeout_ms = PHY_LOCK_TIMEOUT_MS;
u32 reg;
@@ -231,6 +237,18 @@ static void usb_init_common_7211b0(struc
usb_init_common(params);
/*
+ * The BDC controller will get occasional failures with
+ * the default "Read Transaction Size" of 6 (1024 bytes).
+ * Set it to 4 (256 bytes).
+ */
+ if ((params->mode != USB_CTLR_MODE_HOST) && bdc_ec) {
+ reg = brcm_usb_readl(bdc_ec + BDC_EC_AXIRDA);
+ reg &= ~BDC_EC_AXIRDA_RTS_MASK;
+ reg |= (0x4 << BDC_EC_AXIRDA_RTS_SHIFT);
+ brcm_usb_writel(reg, bdc_ec + BDC_EC_AXIRDA);
+ }
+
+ /*
* Disable FSM, otherwise the PHY will auto suspend when no
* device is connected and will be reset on resume.
*/
--- a/drivers/phy/broadcom/phy-brcm-usb-init.h
+++ b/drivers/phy/broadcom/phy-brcm-usb-init.h
@@ -19,6 +19,7 @@ enum brcmusb_reg_sel {
BRCM_REGS_XHCI_GBL,
BRCM_REGS_USB_PHY,
BRCM_REGS_USB_MDIO,
+ BRCM_REGS_BDC_EC,
BRCM_REGS_MAX
};
--- a/drivers/phy/broadcom/phy-brcm-usb.c
+++ b/drivers/phy/broadcom/phy-brcm-usb.c
@@ -36,6 +36,7 @@ struct value_to_name_map {
struct match_chip_info {
void *init_func;
u8 required_regs[BRCM_REGS_MAX + 1];
+ u8 optional_reg;
};
static struct value_to_name_map brcm_dr_mode_to_name[] = {
@@ -71,7 +72,7 @@ struct brcm_usb_phy_data {
};
static s8 *node_reg_names[BRCM_REGS_MAX] = {
- "crtl", "xhci_ec", "xhci_gbl", "usb_phy", "usb_mdio"
+ "crtl", "xhci_ec", "xhci_gbl", "usb_phy", "usb_mdio", "bdc_ec"
};
static irqreturn_t brcm_usb_phy_wake_isr(int irq, void *dev_id)
@@ -271,6 +272,7 @@ static struct match_chip_info chip_info_
BRCM_REGS_USB_MDIO,
-1,
},
+ .optional_reg = BRCM_REGS_BDC_EC,
};
static struct match_chip_info chip_info_7445 = {
@@ -300,7 +302,8 @@ static const struct of_device_id brcm_us
static int brcm_usb_get_regs(struct platform_device *pdev,
enum brcmusb_reg_sel regs,
- struct brcm_usb_init_params *ini)
+ struct brcm_usb_init_params *ini,
+ bool optional)
{
struct resource *res;
@@ -317,7 +320,13 @@ static int brcm_usb_get_regs(struct plat
return 0;
}
if (res == NULL) {
- dev_err(&pdev->dev, "can't get %s base address\n",
+ if (optional) {
+ dev_dbg(&pdev->dev,
+ "Optional reg %s not found\n",
+ node_reg_names[regs]);
+ return 0;
+ }
+ dev_err(&pdev->dev, "can't get %s base addr\n",
node_reg_names[regs]);
return 1;
}
@@ -460,7 +469,13 @@ static int brcm_usb_phy_probe(struct pla
break;
err = brcm_usb_get_regs(pdev, info->required_regs[x],
- &priv->ini);
+ &priv->ini, false);
+ if (err)
+ return -EINVAL;
+ }
+ if (info->optional_reg) {
+ err = brcm_usb_get_regs(pdev, info->optional_reg,
+ &priv->ini, true);
if (err)
return -EINVAL;
}
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