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authorRobert Jarzmik <robert.jarzmik@free.fr>2009-04-21 20:34:44 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2009-06-15 21:44:42 -0700
commit9f5351b743716c796d13235651699fb4ec7aa64f (patch)
treed8cfe409a56f89e3753fd6f82cd38beddb3d4244 /drivers/usb/gadget/pxa27x_udc.c
parentf6d529f936672d341fab14ffb0d8eebeee2d8cd3 (diff)
downloadop-kernel-dev-9f5351b743716c796d13235651699fb4ec7aa64f.zip
op-kernel-dev-9f5351b743716c796d13235651699fb4ec7aa64f.tar.gz
USB: pxa27x_udc: compatibility with pxa320 SoC
Got pxa27x_udc working on the pxa320 Nomad platform. The problem was that the pxa3xx UDC is not quite compatible with the pxa27x UDC in how it handles back-to-back control packets. The pxa27x probably drops them by default, but the pxa320 does not, and you have to detect it and set the OPC bit to clear the zero-length packet. Signed-off-by: Aric Blumer <aric@sdgsystems.com> Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr> Acked-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/gadget/pxa27x_udc.c')
-rw-r--r--drivers/usb/gadget/pxa27x_udc.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/usb/gadget/pxa27x_udc.c b/drivers/usb/gadget/pxa27x_udc.c
index ffe6e0a..51790b0 100644
--- a/drivers/usb/gadget/pxa27x_udc.c
+++ b/drivers/usb/gadget/pxa27x_udc.c
@@ -1892,6 +1892,15 @@ static void handle_ep0_ctrl_req(struct pxa_udc *udc,
nuke(ep, -EPROTO);
+ /*
+ * In the PXA320 manual, in the section about Back-to-Back setup
+ * packets, it describes this situation. The solution is to set OPC to
+ * get rid of the status packet, and then continue with the setup
+ * packet. Generalize to pxa27x CPUs.
+ */
+ if (epout_has_pkt(ep) && (ep_count_bytes_remain(ep) == 0))
+ udc_ep_writel(ep, UDCCSR, UDCCSR0_OPC);
+
/* read SETUP packet */
for (i = 0; i < 2; i++) {
if (unlikely(ep_is_empty(ep)))
@@ -1965,6 +1974,8 @@ stall:
* cleared by software.
* - clearing UDCCSR0_OPC always flushes ep0. If in setup stage, never do it
* before reading ep0.
+ * This is true only for PXA27x. This is not true anymore for PXA3xx family
+ * (check Back-to-Back setup packet in developers guide).
* - irq can be called on a "packet complete" event (opc_irq=1), while
* UDCCSR0_OPC is not yet raised (delta can be as big as 100ms
* from experimentation).
@@ -2575,7 +2586,7 @@ static struct platform_driver udc_driver = {
static int __init udc_init(void)
{
- if (!cpu_is_pxa27x())
+ if (!cpu_is_pxa27x() && !cpu_is_pxa3xx())
return -ENODEV;
printk(KERN_INFO "%s: version %s\n", driver_name, DRIVER_VERSION);
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