Messages in this thread Patches in this message | | | Date | Wed, 3 May 2006 13:24:32 -0400 | From | Monty <> | Subject | patch to emi62.c and emi26.c (firmware loaders for Emagic USB audio boxes) |
| |
Hello folks,
(It's been a few years since I've submitted any kernel patches, my etiquette may be rusty. Feel free to flame me. This was not sent to the listed maintainer as I don't think Tapio's been heard from in some
time. Correct me if I'm wrong :-)
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. It's against 2.6.27-rc3, but should apply to any 2.6 kernel; I don't think the loader has changed for a long time.
(A side note; I notice the firmware loader is using a rather old
firmware version for both devices. Several relatively harmless but annoying bugs have since been fixed... how was the firmware from this device originally extracted? Was it taken from a device driver belonging to another OS, or was it provided as a hexdump from emagic?)
Monty
diff -brwu linux-2.6.17-rc3/drivers/usb/misc/emi26.c linux-2.6.17-rc3-monty/drivers/usb/misc/emi26.c --- linux-2.6.17-rc3/drivers/usb/misc/emi26.c 2006-04-26 22:19:25.000000000 -0400 +++ linux-2.6.17-rc3-monty /drivers/usb/misc/emi26.c 2006-05-02 22:22:50.000000000 -0400 @@ -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 @@
/* 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 @@ -157,6 +159,7 @@ err("%s - error loading firmware: error = %d", __FUNCTION__, err);
goto wraperr; } + msleep(250); /* let device settle */
/* 4. We put the part of the firmware that lies in the external RAM into the EZ-USB */ for (i=0; g_Firmware[i].type == 0; i++) { @@ -192,6 +195,7 @@
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 */ diff -brwu linux-2.6.17-rc3/drivers/usb/misc/emi62.c linux-2.6.17-rc3-monty/drivers/usb/misc/emi62.c --- linux-2.6.17-rc3/drivers/usb/misc/emi62.c 2006-04-26 22:19:25.000000000 -0400 +++ linux-2.6.17-rc3-monty /drivers/usb/misc/emi62.c 2006-05-02 22:54:40.000000000 -0400 @@ -15,6 +15,7 @@ #include <linux/init.h> #include <linux/module.h> #include <linux/usb.h> +#include <linux/delay.h>
#define MAX_INTEL_HEX_RECORD_LENGTH 16 typedef struct _INTEL_HEX_RECORD @@ -123,6 +124,7 @@
/* De-assert reset (let the CPU run) */ err = emi62_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 @@ -166,6 +168,7 @@ err("%s - error loading firmware: error = %d", __FUNCTION__, err);
goto wraperr; } + msleep(250); /* let device settle */
/* 4. We put the part of the firmware that lies in the external RAM into the EZ-USB */ @@ -228,6 +231,7 @@ err("%s - error loading firmware: error = %d", __FUNCTION__, err);
goto wraperr; } + msleep(250); /* let device settle */ kfree(buf);
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |