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authorChunfeng Yun <chunfeng.yun@mediatek.com>2017-10-13 16:26:35 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-10-23 11:29:40 +0200
commitce370bfdb9b30830e9ddb88ba8bde2efdd0c9dc0 (patch)
treeee440524c46bfc28942afa55bfc634ab3a8e7f65 /drivers/usb/host/xhci-mtk.c
parent8465d3e4e7cf8ae9dfd8e206e8077c24d6c0cf4c (diff)
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>
Diffstat (limited to 'drivers/usb/host/xhci-mtk.c')
-rw-r--r--drivers/usb/host/xhci-mtk.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
index 9502ca408f01..7a92bb782e5c 100644
--- a/drivers/usb/host/xhci-mtk.c
+++ b/drivers/usb/host/xhci-mtk.c
@@ -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) {