On Mon, Mar 09, 2020 at 03:20:26PM +0100, Christian Eggers wrote:
> Since b1d9837182, detection of various USB flash drives stopped working.
> While the changes itself look correct, probably the HUB requires some
> "recovery time" between the GET_STATUS commands in order to be able to
> detect devices.
>
> Our configuration: i.MX6ULL (USB-OTG) with only one port on the root
> HUB. This port is connected to a Microchip USB4916 hub (permanently
> attached). The USB4916 is configured with it's power on defaults which
> means that bPwrOn2PwrGood is set to the maximum (0xFF = 510 ms).
>
> Fixes: b1d9837182 ("b1d9837182d2b20232234adb36ada2129c3a8152")
This should probably be:?
Fixes: b1d9837182 ("usb: Change power-on / scanning timeout handling")
- Roland
> Signed-off-by: Christian Eggers <ceggers@xxxxxxx>
> ---
> drivers/usb/core/hub.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index 8874775f17..466bbe527b 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -406,6 +406,9 @@ static int usb_device_list_scan(void)
> if (ret)
> goto out;
> }
> +
> + /* Avoid hammering the HUB with port scans */
> + mdelay(25);
> }
>
> out:
> --
> Christian Eggers
> Embedded software developer
>
> Arnold & Richter Cine Technik GmbH & Co. Betriebs KG
> Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRA 57918
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> Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: HRB 54477
> Geschaeftsfuehrer: Dr. Michael Neuhaeuser; Stephan Schenk; Walter Trauninger; Markus Zeiler
>
>
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--
Roland Hieber, Pengutronix e.K. | r.hieber@xxxxxxxxxxxxxx |
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