Hi Micke,
On 08.11.2019 08:36, Micke Prag wrote:
In commit 00ea16557d [1] the way usb is initiated was changed. Instead
of initiate both ehci-platform and ci_hdrc the bootstrap status register
is checked and used to determine which platform to initiate.
There were other changes later, see for example 57c641ba6e.
Unfortunately this break my board since the gpio used to determine this
is used for other purposes.
This means your board has a wrong bootstrap configuration and you should
make sure GPIO for host/device mode has correct initialization value.
dev-usb.h only exposes one function:
void ath79_register_usb(void);
so there is not much to alter the way usb is initiated.
I tried to write to the bootstrap register but unfortunately this did
not seem to work:
u32 t;
t = ath79_reset_rr(AR933X_RESET_REG_BOOTSTRAP);
pr_warn("ath79: Register before %X", t);
t |= AR933X_BOOTSTRAP_USB_MODE_HOST;
ath79_reset_wr(AR933X_RESET_REG_BOOTSTRAP, t);
pr_warn("ath79: Register after %X",
ath79_reset_rr(AR933X_RESET_REG_BOOTSTRAP));
Gives the following output:
ath79: Register before 42202
ath79: Register after 42202
USB mode in AR9331 is selected at power on, based on GPIO13 value and
I'm not aware of any other/software ways to change it. AFAIK, only
QCA9563 allows to switch between host and device modes 'on the fly'.
How can I solve this?
Only in hardware I suppose (setup correct initial value on GPIO13).
--
Cheers,
Piotr
[1] https://github.com/openwrt/openwrt/commit/00ea16557d
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