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usb: xhci-mtk: fix random remote wakeup

Browse source 
Some platforms, e.g. 8183/8192, use low level latch way to keep
wakeup signal, it may latch a wrong signal if debounce more time,
and enable wakeup function earlier.
                   ____________________
ip_sleep      ____/                    \_____________
                           ___________________
wakeup_signal ____________/                   \______
                      _______________________________
wakeup_en     _______/
                      ^     ^
                      |(1)  |(2)
latch wakeup_signal mistakenly at (1), should latch it at (2);

Workaround: delay about 100us to enable wakeup, meanwhile decrease
debounce time.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/20211102025004.29156-2-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun 2021-11-02 10:50:04 +08:00 committed by Greg Kroah-Hartman
parent 38269d2fad
commit 0d8cfeeef3
1 changed files with 6 additions and 5 deletions
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11
drivers/usb/host/xhci-mtk.c
View file

@ -245,11 +245,12 @@ static int xhci_mtk_host_disable(struct xhci_hcd_mtk *mtk)
/* wait for host ip to sleep */
ret = readl_poll_timeout(&ippc->ip_pw_sts1, value,
(value & STS1_IP_SLEEP_STS), 100, 100000);
if (ret) {
if (ret)
dev_err(mtk->dev, "ip sleep failed!!!\n");
return ret;
}
return 0;
else /* workaound for platforms using low level latch */
usleep_range(100, 200);
return ret;
}
static int xhci_mtk_ssusb_config(struct xhci_hcd_mtk *mtk)
@ -300,7 +301,7 @@ static void usb_wakeup_ip_sleep_set(struct xhci_hcd_mtk *mtk, bool enable)
case SSUSB_UWK_V1_1:
reg = mtk->uwk_reg_base + PERI_WK_CTRL0;
msk = WC0_IS_EN | WC0_IS_C(0xf) | WC0_IS_P;
val = enable ? (WC0_IS_EN | WC0_IS_C(0x8)) : 0;
val = enable ? (WC0_IS_EN | WC0_IS_C(0x1)) : 0;
break;
case SSUSB_UWK_V1_2:
reg = mtk->uwk_reg_base + PERI_WK_CTRL0;