Add support to disable specific ports, it's useful for some scenarios: 1. usb3 PHY is shared whith PCIe or SATA, the corresponding usb3 port can be disabled; 2. some usb2 or usb3 ports are not used on special platforms, they should be disabled to save power.
Signed-off-by: Chunfeng Yun chunfeng.yun@mediatek.com --- drivers/usb/host/xhci-mtk.c | 23 ++++++++++++++++++++--- 1 file changed, 20 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c index f62e232d21..ebda80f2af 100644 --- a/drivers/usb/host/xhci-mtk.c +++ b/drivers/usb/host/xhci-mtk.c @@ -61,10 +61,13 @@ struct mtk_xhci { struct phy_bulk phys; int num_u2ports; int num_u3ports; + u32 u3p_dis_msk; + u32 u2p_dis_msk; };
static int xhci_mtk_host_enable(struct mtk_xhci *mtk) { + int u3_ports_disabed = 0; u32 value; u32 check_val; int ret; @@ -73,15 +76,23 @@ static int xhci_mtk_host_enable(struct mtk_xhci *mtk) /* power on host ip */ clrbits_le32(mtk->ippc + IPPC_IP_PW_CTRL1, CTRL1_IP_HOST_PDN);
- /* power on and enable all u3 ports */ + /* power on and enable u3 ports except skipped ones */ for (i = 0; i < mtk->num_u3ports; i++) { + if (BIT(i) & mtk->u3p_dis_msk) { + u3_ports_disabed++; + continue; + } + clrsetbits_le32(mtk->ippc + IPPC_U3_CTRL(i), CTRL_U3_PORT_PDN | CTRL_U3_PORT_DIS, CTRL_U3_PORT_HOST_SEL); }
- /* power on and enable all u2 ports */ + /* power on and enable u2 ports except skipped ones */ for (i = 0; i < mtk->num_u2ports; i++) { + if (BIT(i) & mtk->u2p_dis_msk) + continue; + clrsetbits_le32(mtk->ippc + IPPC_U2_CTRL(i), CTRL_U2_PORT_PDN | CTRL_U2_PORT_DIS, CTRL_U2_PORT_HOST_SEL); @@ -94,7 +105,7 @@ static int xhci_mtk_host_enable(struct mtk_xhci *mtk) check_val = STS1_SYSPLL_STABLE | STS1_REF_RST | STS1_SYS125_RST | STS1_XHCI_RST;
- if (mtk->num_u3ports) + if (mtk->num_u3ports > u3_ports_disabed) check_val |= STS1_U3_MAC_RST;
ret = readl_poll_timeout(mtk->ippc + IPPC_IP_PW_STS1, value, @@ -176,6 +187,12 @@ static int xhci_mtk_ofdata_get(struct mtk_xhci *mtk) if (ret) debug("can't get vbus regulator %d!\n", ret);
+ /* optional properties to disable ports, ignore the error */ + dev_read_u32(dev, "mediatek,u3p-dis-msk", &mtk->u3p_dis_msk); + dev_read_u32(dev, "mediatek,u2p-dis-msk", &mtk->u2p_dis_msk); + dev_info(dev, "ports disabled mask: u3p-0x%x, u2p-0x%x\n", + mtk->u3p_dis_msk, mtk->u2p_dis_msk); + return 0; }