From 55ba6e9e25a6e64c3e05f2d7bc1359719530fb6b Mon Sep 17 00:00:00 2001 From: Chunfeng Yun Date: Fri, 13 Oct 2017 16:26:36 +0800 Subject: 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 Acked-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-mtk.c | 18 +++++++++++++++--- drivers/usb/host/xhci-mtk.h | 1 + 2 files changed, 16 insertions(+), 3 deletions(-) diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c index 7a92bb7..97ba51e 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) diff --git a/drivers/usb/host/xhci-mtk.h b/drivers/usb/host/xhci-mtk.h index 3aa5e1d..db55a12 100644 --- a/drivers/usb/host/xhci-mtk.h +++ b/drivers/usb/host/xhci-mtk.h @@ -121,6 +121,7 @@ struct xhci_hcd_mtk { bool has_ippc; int num_u2_ports; int num_u3_ports; + int u3p_dis_msk; struct regulator *vusb33; struct regulator *vbus; struct clk *sys_clk; /* sys and mac clock */ -- cgit v1.1