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USB: xhci-plat: fix legacy PHY double init

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Commits 7b8ef22ea5 ("usb: xhci: plat: Add USB phy support") and
9134c1fd05 ("usb: xhci: plat: Add USB 3.0 phy support") added support
for looking up legacy PHYs from the sysdev devicetree node and
initialising them.

This broke drivers such as dwc3 which manages PHYs themself as the PHYs
would now be initialised twice, something which specifically can lead to
resources being left enabled during suspend (e.g. with the
usb_phy_generic PHY driver).

As the dwc3 driver uses driver-name matching for the xhci platform
device, fix this by only looking up and initialising PHYs for devices
that have been matched using OF.

Note that checking that the platform device has a devicetree node would
currently be sufficient, but that could lead to subtle breakages in case
anyone ever tries to reuse an ancestor's node.

Fixes: 7b8ef22ea5 ("usb: xhci: plat: Add USB phy support")
Fixes: 9134c1fd05 ("usb: xhci: plat: Add USB 3.0 phy support")
Cc: stable@vger.kernel.org      # 4.1
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Stanley Chang <stanley_chang@realtek.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Tested-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>
Tested-by: Stanley Chang <stanley_chang@realtek.com>
Link: https://lore.kernel.org/r/20231103164323.14294-1-johan+linaro@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2023-11-03 17:43:23 +01:00 committed by Greg Kroah-Hartman
parent 4b435764f7
commit 16b7e0cccb
1 changed files with 30 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
drivers/usb/host/xhci-plat.c
View File

@ -13,6 +13,7 @@
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/usb/phy.h>
#include <linux/slab.h>
@ -148,7 +149,7 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s
int ret;
int irq;
struct xhci_plat_priv *priv = NULL;
bool of_match;
if (usb_disabled())
return -ENODEV;
@ -253,16 +254,23 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s
&xhci->imod_interval);
}
hcd->usb_phy = devm_usb_get_phy_by_phandle(sysdev, "usb-phy", 0);
if (IS_ERR(hcd->usb_phy)) {
ret = PTR_ERR(hcd->usb_phy);
if (ret == -EPROBE_DEFER)
goto disable_clk;
hcd->usb_phy = NULL;
} else {
ret = usb_phy_init(hcd->usb_phy);
if (ret)
goto disable_clk;
/*
* Drivers such as dwc3 manages PHYs themself (and rely on driver name
* matching for the xhci platform device).
*/
of_match = of_match_device(pdev->dev.driver->of_match_table, &pdev->dev);
if (of_match) {
hcd->usb_phy = devm_usb_get_phy_by_phandle(sysdev, "usb-phy", 0);
if (IS_ERR(hcd->usb_phy)) {
ret = PTR_ERR(hcd->usb_phy);
if (ret == -EPROBE_DEFER)
goto disable_clk;
hcd->usb_phy = NULL;
} else {
ret = usb_phy_init(hcd->usb_phy);
if (ret)
goto disable_clk;
}
}
hcd->tpl_support = of_usb_host_tpl_support(sysdev->of_node);
@ -285,15 +293,17 @@ int xhci_plat_probe(struct platform_device *pdev, struct device *sysdev, const s
goto dealloc_usb2_hcd;
}
xhci->shared_hcd->usb_phy = devm_usb_get_phy_by_phandle(sysdev,
"usb-phy", 1);
if (IS_ERR(xhci->shared_hcd->usb_phy)) {
xhci->shared_hcd->usb_phy = NULL;
} else {
ret = usb_phy_init(xhci->shared_hcd->usb_phy);
if (ret)
dev_err(sysdev, "%s init usb3phy fail (ret=%d)\n",
__func__, ret);
if (of_match) {
xhci->shared_hcd->usb_phy = devm_usb_get_phy_by_phandle(sysdev,
"usb-phy", 1);
if (IS_ERR(xhci->shared_hcd->usb_phy)) {
xhci->shared_hcd->usb_phy = NULL;
} else {
ret = usb_phy_init(xhci->shared_hcd->usb_phy);
if (ret)
dev_err(sysdev, "%s init usb3phy fail (ret=%d)\n",
__func__, ret);
}
}
xhci->shared_hcd->tpl_support = hcd->tpl_support;