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https://git.openwrt.org/openwrt/openwrt.git
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45 lines
1.6 KiB
Diff
45 lines
1.6 KiB
Diff
From fc430aea02068150d053ef24bc424db3dd1357d4 Mon Sep 17 00:00:00 2001
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From: Al Cooper <alcooperx@gmail.com>
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Date: Fri, 3 Jan 2020 13:18:08 -0500
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Subject: [PATCH] phy: usb: PHY's MDIO registers not accessible without device
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installed
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When there is no device connected and FSM is enabled, the XHCI puts
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the PHY into suspend mode. When the PHY is put into suspend mode
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the USB LDO powers down the PHY. This causes the MDIO to be
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inaccessible and its registers reset to default. The fix is to
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disable FSM.
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Signed-off-by: Al Cooper <alcooperx@gmail.com>
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Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
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Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
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---
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drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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--- a/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c
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+++ b/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c
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@@ -56,6 +56,7 @@
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#define USB_PHY_PLL_LDO_CTL 0x08
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#define USB_PHY_PLL_LDO_CTL_AFE_CORERDY_MASK 0x00000004
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#define USB_PHY_UTMI_CTL_1 0x04
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+#define USB_PHY_UTMI_CTL_1_POWER_UP_FSM_EN_MASK 0x00000800
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#define USB_PHY_UTMI_CTL_1_PHY_MODE_MASK 0x0000000c
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#define USB_PHY_UTMI_CTL_1_PHY_MODE_SHIFT 2
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#define USB_PHY_STATUS 0x20
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@@ -229,6 +230,14 @@ static void usb_init_common_7211b0(struc
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usb_init_common(params);
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+ /*
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+ * Disable FSM, otherwise the PHY will auto suspend when no
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+ * device is connected and will be reset on resume.
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+ */
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+ reg = brcm_usb_readl(usb_phy + USB_PHY_UTMI_CTL_1);
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+ reg &= ~USB_PHY_UTMI_CTL_1_POWER_UP_FSM_EN_MASK;
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+ brcm_usb_writel(reg, usb_phy + USB_PHY_UTMI_CTL_1);
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+
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usb2_eye_fix_7211b0(params);
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}
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