usb: xhci-mtk: support option to disable ports

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>

diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
index d301acc9a89b72aab0513d48b8a0cd6dd3166c87..18b4f55d8962396a910d1c103907c925272437e5 100644 (file)
--- 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;
 }