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34 lines
1.2 KiB
Diff
34 lines
1.2 KiB
Diff
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From 79f7d883d980beea9989d06f9fba4fcc0430176a Mon Sep 17 00:00:00 2001
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From: Samuel Holland <samuel@sholland.org>
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Date: Thu, 14 Jul 2022 22:14:38 -0500
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Subject: [PATCH 34/90] phy: sun4i-usb: Do not drive VBUS with external VBUS
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present
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It is possible to use host-side USB with externally-provided VBUS. For
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example, some USB OTG cables have an extra power input which powers
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both the board and the USB peripheral.
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To support this setup, skip enabling the VBUS switch/regulator if VBUS
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voltage is already present. This behavior matches the Linux PHY driver.
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Signed-off-by: Samuel Holland <samuel@sholland.org>
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---
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drivers/phy/allwinner/phy-sun4i-usb.c | 6 ++++++
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1 file changed, 6 insertions(+)
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--- a/drivers/phy/allwinner/phy-sun4i-usb.c
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+++ b/drivers/phy/allwinner/phy-sun4i-usb.c
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@@ -220,6 +220,12 @@ static int sun4i_usb_phy_power_on(struct
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initial_usb_scan_delay = 0;
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}
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+ /* For phy0 only turn on Vbus if we don't have an ext. Vbus */
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+ if (phy->id == 0 && sun4i_usb_phy_vbus_detect(phy)) {
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+ dev_warn(phy->dev, "External vbus detected, not enabling our own vbus\n");
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+ return 0;
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+ }
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+
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if (usb_phy->vbus) {
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ret = regulator_set_enable(usb_phy->vbus, true);
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if (ret && ret != -ENOSYS)
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