diff options
| author | Monty <xiphmont@xiph.org> | 2006-05-09 12:37:22 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-05-12 11:58:09 -0700 |
| commit | 16c23f7d88cbcce491f9370b2846fad66e8ef319 (patch) | |
| tree | 7e69ad84548acabb0bebcfd594c1986292947d83 /drivers/usb/misc/emi26.c | |
| parent | 332bbf613868a5d5938ad9fb7436b2beae72d53d (diff) | |
| download | lwn-16c23f7d88cbcce491f9370b2846fad66e8ef319.tar.gz lwn-16c23f7d88cbcce491f9370b2846fad66e8ef319.zip | |
[PATCH] USB: Emagic USB firmware loading fixes
It's become apparent as machines get faster that the emagic kernel firmware
loaders (based on the ezusb loader) have a reset race. a 400MHz TiBook
never tripped it, but a 2GHz Pentium M seems to hit it about 30% of the
time. The bug is seen as a hung USB box and the kernel error:
drivers/usb/misc/emi62.c: emi62_load_firmware - error loading firmware:
error = -110
The patch below inserts a delay after deasserting reset to allow the box to
settle before a new command is issued. This affects only device startup.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/misc/emi26.c')
| -rw-r--r-- | drivers/usb/misc/emi26.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/usb/misc/emi26.c b/drivers/usb/misc/emi26.c index 3824df33094e..1fd9cb85f4ca 100644 --- a/drivers/usb/misc/emi26.c +++ b/drivers/usb/misc/emi26.c @@ -15,6 +15,7 @@ #include <linux/module.h> #include <linux/init.h> #include <linux/usb.h> +#include <linux/delay.h> #define MAX_INTEL_HEX_RECORD_LENGTH 16 typedef struct _INTEL_HEX_RECORD @@ -114,6 +115,7 @@ static int emi26_load_firmware (struct usb_device *dev) /* De-assert reset (let the CPU run) */ err = emi26_set_reset(dev,0); + msleep(250); /* let device settle */ /* 2. We upload the FPGA firmware into the EMI * Note: collect up to 1023 (yes!) bytes and send them with @@ -150,6 +152,7 @@ static int emi26_load_firmware (struct usb_device *dev) goto wraperr; } } + msleep(250); /* let device settle */ /* De-assert reset (let the CPU run) */ err = emi26_set_reset(dev,0); @@ -192,6 +195,7 @@ static int emi26_load_firmware (struct usb_device *dev) err("%s - error loading firmware: error = %d", __FUNCTION__, err); goto wraperr; } + msleep(250); /* let device settle */ /* return 1 to fail the driver inialization * and give real driver change to load */ |