diff options
| author | Chunfeng Yun <chunfeng.yun@mediatek.com> | 2017-10-13 11:26:36 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-23 12:29:40 +0300 |
| commit | 55ba6e9e25a6e64c3e05f2d7bc1359719530fb6b (patch) | |
| tree | 91cb4e8d24c4331302d5934cab9d2de1d90c4eca /drivers/usb/host/xhci-mtk.c | |
| parent | ce370bfdb9b30830e9ddb88ba8bde2efdd0c9dc0 (diff) | |
| download | linux-55ba6e9e25a6e64c3e05f2d7bc1359719530fb6b.tar.xz | |
usb: xhci-mtk: support option to disable usb3 ports
Add support to disable specific usb3 ports, it's useful when
usb3 phy is shared with PCIe or SATA, because we should disable
the corresponding usb3 port if the phy is used by PCIe or SATA.
Sometimes it's helpful to analyse and solve problems.
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.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c index 7a92bb782e5c..97ba51e4e149 100644 --- a/drivers/usb/host/xhci-mtk.c +++ b/drivers/usb/host/xhci-mtk.c @@ -92,6 +92,7 @@ static int xhci_mtk_host_enable(struct xhci_hcd_mtk *mtk) { struct mu3c_ippc_regs __iomem *ippc = mtk->ippc_regs; u32 value, check_val; + int u3_ports_disabed = 0; int ret; int i; @@ -103,8 +104,13 @@ static int xhci_mtk_host_enable(struct xhci_hcd_mtk *mtk) value &= ~CTRL1_IP_HOST_PDN; writel(value, &ippc->ip_pw_ctr1); - /* power on and enable all u3 ports */ + /* power on and enable u3 ports except skipped ones */ for (i = 0; i < mtk->num_u3_ports; i++) { + if ((0x1 << i) & mtk->u3p_dis_msk) { + u3_ports_disabed++; + continue; + } + value = readl(&ippc->u3_ctrl_p[i]); value &= ~(CTRL_U3_PORT_PDN | CTRL_U3_PORT_DIS); value |= CTRL_U3_PORT_HOST_SEL; @@ -126,7 +132,7 @@ 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) + if (mtk->num_u3_ports > u3_ports_disabed) check_val |= STS1_U3_MAC_RST; ret = readl_poll_timeout(&ippc->ip_pw_sts1, value, @@ -149,8 +155,11 @@ static int xhci_mtk_host_disable(struct xhci_hcd_mtk *mtk) if (!mtk->has_ippc) return 0; - /* power down all u3 ports */ + /* power down u3 ports except skipped ones */ for (i = 0; i < mtk->num_u3_ports; i++) { + if ((0x1 << i) & mtk->u3p_dis_msk) + continue; + value = readl(&ippc->u3_ctrl_p[i]); value |= CTRL_U3_PORT_PDN; writel(value, &ippc->u3_ctrl_p[i]); @@ -573,6 +582,9 @@ static int xhci_mtk_probe(struct platform_device *pdev) } mtk->lpm_support = of_property_read_bool(node, "usb3-lpm-capable"); + /* optional property, ignore the error if it does not exist */ + of_property_read_u32(node, "mediatek,u3p-dis-msk", + &mtk->u3p_dis_msk); ret = usb_wakeup_of_property_parse(mtk, node); if (ret) |