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usb: mtu3: support option to disable usb2 ports

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Add support to disable specific usb2 host ports, it's useful when
a usb2 port is disabled on some platforms, but enabled on others
for the same SoC.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1626340078-29111-9-git-send-email-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun 2021-07-15 17:07:53 +08:00 committed by Greg Kroah-Hartman
parent 88c6b90188
commit d7e1272428
3 changed files with 20 additions and 3 deletions
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4
drivers/usb/mtu3/mtu3.h
View File

@ -228,6 +228,9 @@ struct otg_switch_mtk {
* host only, device only or dual-role mode
* @u2_ports: number of usb2.0 host ports
* @u3_ports: number of usb3.0 host ports
* @u2p_dis_msk: mask of disabling usb2 ports, e.g. bit0==1 to
* disable u2port0, bit1==1 to disable u2port1,... etc,
* but when use dual-role mode, can't disable u2port0
* @u3p_dis_msk: mask of disabling usb3 ports, for example, bit0==1 to
* disable u3port0, bit1==1 to disable u3port1,... etc
* @dbgfs_root: only used when supports manual dual-role switch via debugfs
@ -252,6 +255,7 @@ struct ssusb_mtk {
bool is_host;
int u2_ports;
int u3_ports;
int u2p_dis_msk;
int u3p_dis_msk;
struct dentry *dbgfs_root;
/* usb wakeup for host mode */

8
drivers/usb/mtu3/mtu3_host.c
View File

@ -155,6 +155,9 @@ int ssusb_host_enable(struct ssusb_mtk *ssusb)
/* power on and enable all u2 ports */
for (i = 0; i < num_u2p; i++) {
if ((0x1 << i) & ssusb->u2p_dis_msk)
continue;
value = mtu3_readl(ibase, SSUSB_U2_CTRL(i));
value &= ~(SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS);
value |= SSUSB_U2_PORT_HOST_SEL;
@ -188,8 +191,11 @@ int ssusb_host_disable(struct ssusb_mtk *ssusb, bool suspend)
mtu3_writel(ibase, SSUSB_U3_CTRL(i), value);
}
/* power down and disable all u2 ports */
/* power down and disable u2 ports except skipped ones */
for (i = 0; i < num_u2p; i++) {
if ((0x1 << i) & ssusb->u2p_dis_msk)
continue;
value = mtu3_readl(ibase, SSUSB_U2_CTRL(i));
value |= SSUSB_U2_PORT_PDN;
value |= suspend ? 0 : SSUSB_U2_PORT_DIS;

11
drivers/usb/mtu3/mtu3_plat.c
View File

@ -225,6 +225,8 @@ static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
/* optional property, ignore the error if it does not exist */
of_property_read_u32(node, "mediatek,u3p-dis-msk",
&ssusb->u3p_dis_msk);
of_property_read_u32(node, "mediatek,u2p-dis-msk",
&ssusb->u2p_dis_msk);
otg_sx->vbus = devm_regulator_get(dev, "vbus");
if (IS_ERR(otg_sx->vbus)) {
@ -241,6 +243,9 @@ static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
of_property_read_bool(node, "enable-manual-drd");
otg_sx->role_sw_used = of_property_read_bool(node, "usb-role-switch");
/* can't disable port0 when use dual-role mode */
ssusb->u2p_dis_msk &= ~0x1;
if (otg_sx->role_sw_used || otg_sx->manual_drd_enabled)
goto out;
@ -253,9 +258,11 @@ static int get_ssusb_rscs(struct platform_device *pdev, struct ssusb_mtk *ssusb)
}
out:
dev_info(dev, "dr_mode: %d, is_u3_dr: %d, u3p_dis_msk: %x, drd: %s\n",
ssusb->dr_mode, otg_sx->is_u3_drd, ssusb->u3p_dis_msk,
dev_info(dev, "dr_mode: %d, is_u3_dr: %d, drd: %s\n",
ssusb->dr_mode, otg_sx->is_u3_drd,
otg_sx->manual_drd_enabled ? "manual" : "auto");
dev_info(dev, "u2p_dis_msk: %x, u3p_dis_msk: %x\n",
ssusb->u2p_dis_msk, ssusb->u3p_dis_msk);
return 0;
}