This is a note to let you know that I've just added the patch titled
phy: usb: Toggle the PHY power during init
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
phy-usb-toggle-the-phy-power-during-init.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit cc2bf570b2deb1852288fd18cd739d97d495e579
Author: Justin Chen <justin.chen@xxxxxxxxxxxx>
Date: Thu Oct 24 14:35:40 2024 -0700
phy: usb: Toggle the PHY power during init
[ 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@xxxxxxxxxxxx>
Acked-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20241024213540.1059412-1-justin.chen@xxxxxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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 */
