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usb: xhci-mtk: support option to disable ports

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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>
This commit is contained in:
Chunfeng Yun 2020-12-23 09:52:20 +08:00 committed by Marek Vasut
parent c7182c02ce
commit 04232f78b3
1 changed files with 20 additions and 3 deletions
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23
drivers/usb/host/xhci-mtk.c
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@ -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;
}