From 57075a472a5c2b9a7c498a9dc2f2cfcc1e898ec2 Mon Sep 17 00:00:00 2001 From: Chen-Yu Tsai Date: Wed, 7 Sep 2016 14:25:21 +0800 Subject: [PATCH] sunxi: musb: Power off OTG port VBUS when disabled The Linux kernel musb driver expects VBUS to be off while initializing musb. Having it on results in a repeating string of warnings, followed by an unusable peripheral. The peripheral is only usable after physically removing the OTG adapter, letting musb reset its state. This partially reverts commit c9f8947e6604 ("sunxi: usb-phy: Never power off the usb ports") Signed-off-by: Chen-Yu Tsai Reviewed-by: Hans de Goede Signed-off-by: Hans de Goede --- arch/arm/include/asm/arch-sunxi/usb_phy.h | 1 - arch/arm/mach-sunxi/usb_phy.c | 7 ------ drivers/usb/musb-new/sunxi.c | 28 ++++++++++------------- 3 files changed, 12 insertions(+), 24 deletions(-) diff --git a/arch/arm/include/asm/arch-sunxi/usb_phy.h b/arch/arm/include/asm/arch-sunxi/usb_phy.h index 6a14cad3ff..cef6c985bc 100644 --- a/arch/arm/include/asm/arch-sunxi/usb_phy.h +++ b/arch/arm/include/asm/arch-sunxi/usb_phy.h @@ -16,7 +16,6 @@ void sunxi_usb_phy_init(int index); void sunxi_usb_phy_exit(int index); void sunxi_usb_phy_power_on(int index); void sunxi_usb_phy_power_off(int index); -int sunxi_usb_phy_power_is_on(int index); int sunxi_usb_phy_vbus_detect(int index); int sunxi_usb_phy_id_detect(int index); void sunxi_usb_phy_enable_squelch_detect(int index, int enable); diff --git a/arch/arm/mach-sunxi/usb_phy.c b/arch/arm/mach-sunxi/usb_phy.c index f9993d2875..bd1bbee410 100644 --- a/arch/arm/mach-sunxi/usb_phy.c +++ b/arch/arm/mach-sunxi/usb_phy.c @@ -296,13 +296,6 @@ void sunxi_usb_phy_power_off(int index) gpio_set_value(phy->gpio_vbus, 0); } -int sunxi_usb_phy_power_is_on(int index) -{ - struct sunxi_usb_phy *phy = &sunxi_usb_phy[index]; - - return phy->power_on_count > 0; -} - int sunxi_usb_phy_vbus_detect(int index) { struct sunxi_usb_phy *phy = &sunxi_usb_phy[index]; diff --git a/drivers/usb/musb-new/sunxi.c b/drivers/usb/musb-new/sunxi.c index c016a0bb54..dece7818dc 100644 --- a/drivers/usb/musb-new/sunxi.c +++ b/drivers/usb/musb-new/sunxi.c @@ -205,6 +205,8 @@ static struct musb *sunxi_musb; static int sunxi_musb_enable(struct musb *musb) { + int ret; + pr_debug("%s():\n", __func__); musb_ep_select(musb->mregs, 0); @@ -217,26 +219,17 @@ static int sunxi_musb_enable(struct musb *musb) musb_writeb(musb->mregs, USBC_REG_o_VEND0, 0); if (is_host_enabled(musb)) { - int id = sunxi_usb_phy_id_detect(0); - - if (id == 1 && sunxi_usb_phy_power_is_on(0)) - sunxi_usb_phy_power_off(0); - - if (!sunxi_usb_phy_power_is_on(0)) { - int vbus = sunxi_usb_phy_vbus_detect(0); - if (vbus == 1) { - printf("A charger is plugged into the OTG: "); - return -ENODEV; - } + ret = sunxi_usb_phy_vbus_detect(0); + if (ret == 1) { + printf("A charger is plugged into the OTG: "); + return -ENODEV; } - - if (id == 1) { + ret = sunxi_usb_phy_id_detect(0); + if (ret == 1) { printf("No host cable detected: "); return -ENODEV; } - - if (!sunxi_usb_phy_power_is_on(0)) - sunxi_usb_phy_power_on(0); + sunxi_usb_phy_power_on(0); /* port power on */ } USBC_ForceVbusValidToHigh(musb->mregs); @@ -252,6 +245,9 @@ static void sunxi_musb_disable(struct musb *musb) if (!enabled) return; + if (is_host_enabled(musb)) + sunxi_usb_phy_power_off(0); /* port power off */ + USBC_ForceVbusValidToLow(musb->mregs); mdelay(200); /* Wait for the current session to timeout */ -- 2.30.2