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>
diff --git a/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c b/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c
index ce4226a..6096982 100644
--- 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(struct brcm_usb_init_params *params)
{
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(struct brcm_usb_init_params *params)
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.
*/
