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usb: xhci-mtk: check clock stability of U3_MAC 

This is useful to find out the root cause when the Super Speed doesn't
work. Such as when the T-PHY is switched to PCIe or SATA, and affects
Super Speed function, the check will fail.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Acked-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun 2017-10-13 16:26:35 +08:00 committed by Greg Kroah-Hartman
parent 8465d3e4e7
commit ce370bfdb9
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/host/xhci-mtk.c
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@ -43,6 +43,7 @@
/* ip_pw_sts1 register */
#define STS1_IP_SLEEP_STS BIT(30)
#define STS1_U3_MAC_RST BIT(16)
#define STS1_XHCI_RST BIT(11)
#define STS1_SYS125_RST BIT(10)
#define STS1_REF_RST BIT(8)
@ -125,6 +126,9 @@ static int xhci_mtk_host_enable(struct xhci_hcd_mtk *mtk)
check_val = STS1_SYSPLL_STABLE | STS1_REF_RST |
STS1_SYS125_RST | STS1_XHCI_RST;
if (mtk->num_u3_ports)
check_val |= STS1_U3_MAC_RST;
ret = readl_poll_timeout(&ippc->ip_pw_sts1, value,
(check_val == (value & check_val)), 100, 20000);
if (ret) {