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authorMonty <xiphmont@xiph.org>2006-05-09 12:37:22 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2006-05-12 11:58:09 -0700
commit16c23f7d88cbcce491f9370b2846fad66e8ef319 (patch)
tree7e69ad84548acabb0bebcfd594c1986292947d83 /drivers/usb/misc/emi26.c
parent332bbf613868a5d5938ad9fb7436b2beae72d53d (diff)
[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.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/usb/misc/emi26.c b/drivers/usb/misc/emi26.c
index 3824df33094..1fd9cb85f4c 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 */