Dear Albert ARIBAUD,
Hi Mike,
On Fri, 12 Apr 2013 11:59:16 -0700, Mike Dunn mikedunn@newsguy.com
wrote:
On the pxa270, if the udc device is not disabled before jumping to linux, the device fails to initialize in linux because it was left in a running state, and the linux driver assumes that it is in a disabled state.
Signed-off-by: Mike Dunn mikedunn@newsguy.com
Changelog: v3: no change v2: no change
Arguably, this is a bug in the linux driver, but it seemed pretty simple and benign to just disable it in u-boot. I'll also send a patch to upstream kernel to fix its driver.
arch/arm/include/asm/bootm.h | 1 + arch/arm/lib/bootm.c | 1 + 2 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/arch/arm/include/asm/bootm.h b/arch/arm/include/asm/bootm.h index db2ff94..68189cc 100644 --- a/arch/arm/include/asm/bootm.h +++ b/arch/arm/include/asm/bootm.h @@ -21,6 +21,7 @@
#ifdef CONFIG_USB_DEVICE extern void udc_disconnect(void);
+extern void udc_disable(void);
#endif
#endif
diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c index f3b30c5..6daa7bf 100644 --- a/arch/arm/lib/bootm.c +++ b/arch/arm/lib/bootm.c @@ -105,6 +105,7 @@ static void announce_and_cleanup(void)
#ifdef CONFIG_USB_DEVICE
udc_disconnect();
- udc_disable();
#endif
cleanup_before_linux();
}
Acked-By: Albert ARIBAUD albert.u.boot@aribaud.net
Tom, will this not break any of your musb-toys?
Best regards, Marek Vasut