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phy: usb: Toggle the PHY power during init

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When bringing up the PHY, it might be in a bad state if left powered.
One case is we lose the PLL lock if the PLL is gated while the PHY
is powered. Toggle the PHY power so we can start from a known state.

Fixes: 4e5b9c9a73 ("phy: usb: Add support for new Synopsys USB controller on the 7216")
Signed-off-by: Justin Chen <justin.chen@broadcom.com>
Acked-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://lore.kernel.org/r/20241024213540.1059412-1-justin.chen@broadcom.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Justin Chen 2024-10-24 14:35:40 -07:00 committed by Vinod Koul
parent 40384c840e
commit 0a92ea87bd
1 changed files with 6 additions and 0 deletions
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6
drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c
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@ -325,6 +325,12 @@ static void usb_init_common_7216(struct brcm_usb_init_params *params)
void __iomem *ctrl = params->regs[BRCM_REGS_CTRL];
USB_CTRL_UNSET(ctrl, USB_PM, XHC_S2_CLK_SWITCH_EN);
/*
* The PHY might be in a bad state if it is already powered
* up. Toggle the power just in case.
*/
USB_CTRL_SET(ctrl, USB_PM, USB_PWRDN);
USB_CTRL_UNSET(ctrl, USB_PM, USB_PWRDN);
/* 1 millisecond - for USB clocks to settle down */