The usb0 / otg phy on sunxi boards has a bug where it wrongly detects a high speed squelch on usb reset deassert when a lo speed device is plugged in.
The android kernel has a work around for this in the form of temporary disabling the phy's squelch detection on reset deassert, this commit adds the same workaround to the u-boot sunxi musb code, thereby fixing various usb lo speed devices not working. Tested with a (before non working) usb keyboard and a usb 2.4 GHz wireless keyboard/mouse combo receiver. Signed-off-by: Hans de Goede <[email protected]> --- arch/arm/cpu/armv7/sunxi/usbc.c | 7 +++++++ arch/arm/include/asm/arch-sunxi/usbc.h | 1 + drivers/usb/musb-new/musb_uboot.c | 14 ++++++++++++++ 3 files changed, 22 insertions(+) diff --git a/arch/arm/cpu/armv7/sunxi/usbc.c b/arch/arm/cpu/armv7/sunxi/usbc.c index d2d9891..1c777aa 100644 --- a/arch/arm/cpu/armv7/sunxi/usbc.c +++ b/arch/arm/cpu/armv7/sunxi/usbc.c @@ -182,6 +182,13 @@ static void sunxi_usb_passby(struct sunxi_usbc_hcd *sunxi_usbc, int enable) return; } +void sunxi_usbc_enable_squelch_detect(int index, int enable) +{ + struct sunxi_usbc_hcd *sunxi_usbc = &sunxi_usbc_hcd[index]; + + usb_phy_write(sunxi_usbc, 0x3c, enable ? 0 : 2, 2); +} + int sunxi_usbc_request_resources(int index) { struct sunxi_usbc_hcd *sunxi_usbc = &sunxi_usbc_hcd[index]; diff --git a/arch/arm/include/asm/arch-sunxi/usbc.h b/arch/arm/include/asm/arch-sunxi/usbc.h index 67281ec..ab0f272 100644 --- a/arch/arm/include/asm/arch-sunxi/usbc.h +++ b/arch/arm/include/asm/arch-sunxi/usbc.h @@ -21,3 +21,4 @@ void sunxi_usbc_disable(int index); void sunxi_usbc_vbus_enable(int index); void sunxi_usbc_vbus_disable(int index); int sunxi_usbc_vbus_detect(int index); +void sunxi_usbc_enable_squelch_detect(int index, int enable); diff --git a/drivers/usb/musb-new/musb_uboot.c b/drivers/usb/musb-new/musb_uboot.c index 6e58ddf..51fb3fd 100644 --- a/drivers/usb/musb-new/musb_uboot.c +++ b/drivers/usb/musb-new/musb_uboot.c @@ -1,5 +1,8 @@ #include <common.h> #include <watchdog.h> +#ifdef CONFIG_ARCH_SUNXI +#include <asm/arch/usbc.h> +#endif #include <asm/errno.h> #include <linux/usb/ch9.h> #include <linux/usb/gadget.h> @@ -186,8 +189,19 @@ void usb_reset_root_port(void) power &= 0xf0; musb_writeb(mbase, MUSB_POWER, MUSB_POWER_RESET | power); mdelay(50); +#ifdef CONFIG_ARCH_SUNXI + /* + * sunxi phy has a bug and it will wrongly detect high speed squelch + * when clearing reset on low-speed devices, temporary disable + * squelch detection to work around this. + */ + sunxi_usbc_enable_squelch_detect(0, 0); +#endif power = musb_readb(mbase, MUSB_POWER); musb_writeb(mbase, MUSB_POWER, ~MUSB_POWER_RESET & power); +#ifdef CONFIG_ARCH_SUNXI + sunxi_usbc_enable_squelch_detect(0, 1); +#endif host->isr(0, host); host_speed = (musb_readb(mbase, MUSB_POWER) & MUSB_POWER_HSMODE) ? USB_SPEED_HIGH : -- 2.3.4 _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
