| Message ID | 20221117205411.11489-2-ftoth@exalondelft.nl (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | usb: dwc3: core: defer probe on ulpi_read_id timeout | expand |
On Thu, Nov 17, 2022 at 09:54:10PM +0100, Ferry Toth wrote: > Since commit 0f010171 > Dual Role support on Intel Merrifield platform broke due to rearranging > the call to dwc3_get_extcon(). Not sure why format is broken, you may add into your ~/.gitconfig [core] abbrev = 12 [alias] one = show -s --pretty='format:%h (\"%s\")' and run git one 0f010171 with the result 0f0101719138 ("usb: dwc3: Don't switch OTG -> peripheral if extcon is present") > 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.
diff --git a/drivers/usb/common/ulpi.c b/drivers/usb/common/ulpi.c index d7c8461976ce..60e8174686a1 100644 --- a/drivers/usb/common/ulpi.c +++ b/drivers/usb/common/ulpi.c @@ -207,7 +207,7 @@ static int ulpi_read_id(struct ulpi *ulpi) /* 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)
Since commit 0f010171 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. Signed-off-by: Ferry Toth <ftoth@exalondelft.nl> --- drivers/usb/common/ulpi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)