On Wed, Nov 09, 2022 at 11:17:49PM +0100, Ferry Toth wrote:
> 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. Due to the timeout being masked dwc3 probe continues by
> calling dwc3_core_soft_reset() followed by dwc3_get_extcon() which happens
> to return -EPROBE_DEFER. On deferred probe ulpi_read_id() finally succeeds.
>
> This patch changes ulpi_read_id() to return -ETIMEDOUT when it occurs and
> catches the error in dwc3_core_init(). It handles the error by calling
> dwc3_core_soft_reset() after which it requests -EPROBE_DEFER. On deferred
> probe ulpi_read_id() again succeeds.
>
> Signed-off-by: Ferry Toth <ftoth@xxxxxxxxxxxxxx>
> ---
> drivers/usb/common/ulpi.c | 5 +++--
> drivers/usb/dwc3/core.c | 5 ++++-
> 2 files changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/common/ulpi.c b/drivers/usb/common/ulpi.c
> index d7c8461976ce..d8f22bc2f9d0 100644
> --- a/drivers/usb/common/ulpi.c
> +++ b/drivers/usb/common/ulpi.c
> @@ -206,8 +206,9 @@ static int ulpi_read_id(struct ulpi *ulpi)
>
> /* Test the interface */
> ret = ulpi_write(ulpi, ULPI_SCRATCH, 0xaa);
> - if (ret < 0)
> - goto err;
> + if (ret < 0) {
> + return ret;
> + }
No need for the curly brackets.
thanks,
--
heikki
