AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-02 05:16:47 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

usb: chipidea: Grab the (legacy) USB PHY by phandle first

Browse Source 
According to the chipidea driver bindings, the USB PHY is specified via
the "phys" phandle node. However, this only takes effect for USB PHYs
that use the common PHY framework. For legacy USB PHYs, a simple lookup
based on the USB PHY type is done instead.

This does not play out well when more than one USB PHY is registered,
since the first registered PHY matching the type will always be
returned regardless of what the driver was bound to.

Fix this by looking up the PHY based on the "phys" phandle node.
Although generic PHYs are rather matched by their "phys-name" and not
the "phys" phandle directly, there is no helper for similar lookup on
legacy PHYs and it's probably not worth the effort to add it.

When no legacy USB PHY is found by phandle, fallback to grabbing any
registered USB2 PHY. This ensures backward compatibility if some users
were actually relying on this mechanism.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paul Kocialkowski 2019-02-27 06:51:36 +00:00 committed by Greg Kroah-Hartman
parent 5f0632c467
commit 68ef236274
1 changed files with 8 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/usb/chipidea/core.c
View File

@ -954,8 +954,15 @@ static int ci_hdrc_probe(struct platform_device *pdev)
} else if (ci->platdata->usb_phy) {
ci->usb_phy = ci->platdata->usb_phy;
} else {
ci->usb_phy = devm_usb_get_phy_by_phandle(dev->parent, "phys",
0);
ci->phy = devm_phy_get(dev->parent, "usb-phy");
ci->usb_phy = devm_usb_get_phy(dev->parent, USB_PHY_TYPE_USB2);
/* Fallback to grabbing any registered USB2 PHY */
if (IS_ERR(ci->usb_phy) &&
PTR_ERR(ci->usb_phy) != -EPROBE_DEFER)
ci->usb_phy = devm_usb_get_phy(dev->parent,
USB_PHY_TYPE_USB2);
/* if both generic PHY and USB PHY layers aren't enabled */
if (PTR_ERR(ci->phy) == -ENOSYS &&