[PATCH AUTOSEL 4.19 070/219] usb: ehci-omap: Fix deferred probe for phy handling

Sasha Levin
2019-11-22T05:50:33Z

From: Roger Quadros <rogerq@ti.com>

[ Upstream commit 8dc7623bf608495b6e6743e805807c7840673573 ]

PHY model is being used on omap5 platforms even if port mode
is not OMAP_EHCI_PORT_MODE_PHY. So don't guess if PHY is required
or not based on PHY mode.

If PHY is provided in device tree, it must be required. So, if
devm_usb_get_phy_by_phandle() gives us an error code other
than -ENODEV (no PHY) then error out.

This fixes USB Ethernet on omap5-uevm if PHY happens to
probe after EHCI thus causing a -EPROBE_DEFER.

Cc: Johan Hovold <johan@kernel.org>
Cc: Ladislav Michl <ladis@linux-mips.org>
Reported-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Tested-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/usb/host/ehci-omap.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/host/ehci-omap.c b/drivers/usb/host/ehci-omap.c
index 7e4c13346a1ee..7d20296cbe9f9 100644
--- a/drivers/usb/host/ehci-omap.c
+++ b/drivers/usb/host/ehci-omap.c
@@ -159,11 +159,12 @@ static int ehci_hcd_omap_probe(struct platform_device *pdev)
/* get the PHY device */
phy = devm_usb_get_phy_by_phandle(dev, "phys", i);
if (IS_ERR(phy)) {
- /* Don't bail out if PHY is not absolutely necessary */
- if (pdata->port_mode[i] != OMAP_EHCI_PORT_MODE_PHY)
+ ret = PTR_ERR(phy);
+ if (ret == -ENODEV) { /* no PHY */
+ phy = NULL;
continue;
+ }

- ret = PTR_ERR(phy);
if (ret != -EPROBE_DEFER)
dev_err(dev, "Can't get PHY for port %d: %d\n",
i, ret);
--
2.20.1