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authorHans de Goede <hdegoede@redhat.com>2015-01-11 20:34:51 +0100
committerMarek Vasut <marex@denx.de>2015-01-18 12:31:36 +0100
commit90cdc1039d0bf6d85bb497dbb93d317ad234e846 (patch)
tree753472c23d0d45336216db7e9a6c06634c71f732 /drivers/usb
parente8672e3f0ec571d0ca7ccd8cbbeb113802c1d443 (diff)
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musb-new: Fix reset sequence when in host mode
This commit fixes a number of issues with the reset sequence of musb-new in host mode: 1) Our usb device probe relies on a second device reset being done after the first descriptors read. Factor the musb reset code into a usb_reset_root_port function (and add this as an empty define for other controllers), and call this when a device has no parent. 2) Just like with normal usb controllers there needs to be a delay after reset, for normal usb controllers, this is handled in hub_port_reset, add a delay to usb_reset_root_port. 3) Sync the musb reset sequence with the upstream kernel, clear all bits of power except bits 4-7, and increase the time reset is asserted to 50 ms. With these fixes an usb keyboard I have now always enumerates properly, where as earlier it would only enumerare properly once every 5 tries. Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/musb-new/musb_uboot.c31
1 files changed, 20 insertions, 11 deletions
diff --git a/drivers/usb/musb-new/musb_uboot.c b/drivers/usb/musb-new/musb_uboot.c
index 28500bf..dab6f9b 100644
--- a/drivers/usb/musb-new/musb_uboot.c
+++ b/drivers/usb/musb-new/musb_uboot.c
@@ -110,9 +110,27 @@ int submit_int_msg(struct usb_device *dev, unsigned long pipe,
return submit_urb(&hcd, urb);
}
-int usb_lowlevel_init(int index, enum usb_init_type init, void **controller)
+void usb_reset_root_port(void)
{
+ void *mbase = host->mregs;
u8 power;
+
+ power = musb_readb(mbase, MUSB_POWER);
+ power &= 0xf0;
+ musb_writeb(mbase, MUSB_POWER, MUSB_POWER_RESET | power);
+ mdelay(50);
+ power = musb_readb(mbase, MUSB_POWER);
+ musb_writeb(mbase, MUSB_POWER, ~MUSB_POWER_RESET & power);
+ host->isr(0, host);
+ host_speed = (musb_readb(mbase, MUSB_POWER) & MUSB_POWER_HSMODE) ?
+ USB_SPEED_HIGH :
+ (musb_readb(mbase, MUSB_DEVCTL) & MUSB_DEVCTL_FSDEV) ?
+ USB_SPEED_FULL : USB_SPEED_LOW;
+ mdelay((host_speed == USB_SPEED_LOW) ? 200 : 50);
+}
+
+int usb_lowlevel_init(int index, enum usb_init_type init, void **controller)
+{
void *mbase;
/* USB spec says it may take up to 1 second for a device to connect */
unsigned long timeout = get_timer(0) + 1000;
@@ -131,16 +149,7 @@ int usb_lowlevel_init(int index, enum usb_init_type init, void **controller)
if (get_timer(0) >= timeout)
return -ENODEV;
- power = musb_readb(mbase, MUSB_POWER);
- musb_writeb(mbase, MUSB_POWER, MUSB_POWER_RESET | power);
- udelay(30000);
- power = musb_readb(mbase, MUSB_POWER);
- musb_writeb(mbase, MUSB_POWER, ~MUSB_POWER_RESET & power);
- host->isr(0, host);
- host_speed = (musb_readb(mbase, MUSB_POWER) & MUSB_POWER_HSMODE) ?
- USB_SPEED_HIGH :
- (musb_readb(mbase, MUSB_DEVCTL) & MUSB_DEVCTL_FSDEV) ?
- USB_SPEED_FULL : USB_SPEED_LOW;
+ usb_reset_root_port();
host->is_active = 1;
hcd.hcd_priv = host;