5.10-stable review patch. If anyone has any objections, please let me know.
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From: Justin Chen justin.chen@broadcom.com
[ Upstream commit 0a92ea87bdd6f77ca4e17fe19649882cf5209edd ]
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: 4e5b9c9a73b3 ("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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c b/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c index d2524b70ea16..fa54da35719f 100644 --- a/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c +++ b/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c @@ -309,6 +309,12 @@ 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 */