sunxi: musb: Fix some lo speed devices not working with musb host
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 <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
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 @@
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 :