From: Ferry Toth ftoth@exalondelft.nl
commit 8a7b31d545d3a15f0e6f5984ae16f0ca4fd76aac upstream.
Since commit 0f0101719138 ("usb: dwc3: Don't switch OTG -> peripheral if extcon is present") Dual Role support on Intel Merrifield platform broke due to rearranging the call to dwc3_get_extcon().
It appears to be caused by ulpi_read_id() on the first test write failing with -ETIMEDOUT. Currently ulpi_read_id() expects to discover the phy via DT when the test write fails and returns 0 in that case, even if DT does not provide the phy. As a result usb probe completes without phy.
Make ulpi_read_id() return -ETIMEDOUT to its user if the first test write fails. The user should then handle it appropriately. A follow up patch will make dwc3_core_init() set -EPROBE_DEFER in this case and bail out.
Fixes: ef6a7bcfb01c ("usb: ulpi: Support device discovery via DT") Cc: stable@vger.kernel.org Acked-by: Heikki Krogerus heikki.krogerus@linux.intel.com Signed-off-by: Ferry Toth ftoth@exalondelft.nl Link: https://lore.kernel.org/r/20221205201527.13525-2-ftoth@exalondelft.nl Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/common/ulpi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/usb/common/ulpi.c +++ b/drivers/usb/common/ulpi.c @@ -208,7 +208,7 @@ static int ulpi_read_id(struct ulpi *ulp /* Test the interface */ ret = ulpi_write(ulpi, ULPI_SCRATCH, 0xaa); if (ret < 0) - goto err; + return ret;
ret = ulpi_read(ulpi, ULPI_SCRATCH); if (ret < 0)