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When powering down SSUSB, the system needs to wait the ACK from SSUSB.
We found that the setting of USB PAD top macro is not correct and
it will cause timeout waiting for the ACK from SSUSB.
To resolve this, we add mt_pll_set_usb_clock() in pll.c to enable usb
macro control for powering down SSUSB.
TEST=timeout of ssusb powerdown ack does not occur.
BUG=b:239634625
Signed-off-by: Allen-KH Cheng <allen-kh.cheng@mediatek.corp-partner.google.com>
Change-Id: I58ba86e0467284e9947bfda1005c151a3e0c8881
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66600
Reviewed-by: Yidi Lin <yidilin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
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The MT8186 platform fails to suspend due to premature wakeup by USB.
In MT8186, we use low level latch to keep USB wakeup signal. However,
hardware could latch a wrong signal if it debounces more than one time.
As a result, it would enable wakeup function too early.
To prevent this issue, we do the following modification:
- Delay about 100 us to enable wakeup function in kernel drivers [1].
- To guarantee 100 us is enough, we need to disable the USB debounce by
default in coreboot.
According to section register 0x404 and 0x420 in
"(CODA) MT8169_PERICFG_REG.xls" which is only for MediaTek internal use:
The current default value of debounce register for MT8186 USB IP0 and
IP1 is incorrect. The reason we add in coreboot is that the default
value should be correct when SoC is booting up.
This modification is only for MT8186. The subsequent SoCs will adjust
the wakeup function to correct register value by default.
[1]: 0d8cfeeef3f5 (usb: xhci-mtk: fix random remote wakeup)
TEST=after stress test, not found premature wakeup by USB
BUG=b:228773975
Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Change-Id: I296c4491c5959670a39fa8bd6ef987557bbc459f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63858
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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To save the S3 power, USB3_HUB_RST_L is externally pulled up to a weak
resistor, so we have to reset the hub as early as possible.
Otherwise the USB3 hub may be not usable. Therefore, move USB3 HUB
reset function to bootblock.
BUG=b:210065282
TEST=build pass
Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Change-Id: I92feb2316302fda32478b24c014bcd380d0ac55d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60088
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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1. Enable and setup USB drivers.
2. Pull up to a weak resistor for USB3_HUB_RST_L and we reset
the hub via GPIO149.
TEST=boot kernel from USB ok
BUG=b:202871018
Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Change-Id: Ifcc11d51b0c1e495477957111e6021ef8275f629
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59251
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
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