#2257: gsm0710muxd: "Modem does not respond to AT commands"
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Reporter: lindi | Owner: openmoko-kernel
Type: defect | Status: new
Priority: high | Milestone: stable-kernel-2009.1
Component: System Software | Version: unspecified
Severity: major | Keywords:
Haspatch: 0 | Blockedby:
Estimated: | Patchreview:
Blocking: | Reproducible: sometimes
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Comment(by arhuaco):
I tested with your setup. The shr-testing kernel I flashed is recent
enough.
- flash http://build.shr-project.org/shr-testing/images/om-gta02/shr-lite-
image-om-gta02.jffs2
- flash http://build.shr-project.org/shr-testing/images/om-
gta02/uImage-2.6.29-oe10+gitr81c61a7d1abb03aecd13f5395aba355e996a1641-r3.4
-om-gta02.bin
- boot
- install http://www.opkg.org/packages/socat_1.3.2.1-r1_armv4t.ipk
- reboot
r...@om-gta02 ~ $ fuser /dev/ttySAC0
1540
r...@om-gta02 ~ $ kill -9 1540
r...@om-gta02 ~ $ fuser /dev/ttySAC0
You might want to move /usr/sbin/gsm0710muxd out of the way while you make
this test because it can be started while you are testing (it happened to
me).
r...@om-gta02 ~ $ cd /sys/class/i2c-adapter/i2c-0/0-0073/neo1973-pm-
gsm.0/ ; echo 0 > power_on ; sleep 3 ; echo 1 > power_on ; echo 1 > reset
; socat - file:/dev/ttySAC0,crtscts,crnl,b115200
AT-Command Interpreter ready
(Last command worked in the same way 5 times).
Relevant kernel messages after you execute the command (once):
modem wakeup interrupt
rxerr: port=0 ch=0x00, rxs=0x0000000c
I tried latest andy-tracking and I think the later rxerr message is OK
when you start using the port. I enabled dbg in samsung.h (and a few other
messages, see diffs at the end) and I got this:
[21474677.270000] modem wakeup interrupt
[21474834.305000] dbg:s3c24xx_serial_stop_rx: port=c04a06fc
[ 32.630000] modem wakeup interrupt
[ 34.010000] dbg:s3c24xx_serial_startup: port=50000000
(f5000000,c04a09b4)
[ 34.015000] rxerr: port=0 ch=0x00, rxs=0x0000000c
[ 34.015000] dbg:break!
[ 34.015000] dbg:S3C2410_UERSTAT_FRAME
[ 34.015000] dbg:flag=0
[ 34.020000] dbg:requesting tx irq...
[ 34.025000] dbg:s3c24xx_serial_startup ok
[ 34.030000] dbg:config: 8bits/char
[ 34.035000] dbg:setting ulcon to 00000003, brddiv to 26, udivslot
00000000
[ 34.035000] dbg:uart: ulcon = 0x00000003, ucon = 0x000003c5, ufcon =
0x00000011
Could you repeat the same test? (without the kernel modifications), just
make sure that /usr/sbin/gsm0710muxd doesn't interrupt your tests.
Now I guess even when this is working we might get interruptions once in a
while and that is the problem that was originally reported.
gsm0710muxd has a watchdog. I assume that if "echo 0 > power_on; sleep 3;
echo 1 > power_on; echo 1 > reset" is working then the watchdog could do
exactly the same? (It already resets the modem but there could be a timing
issue, perhaps a longer delay is needed before the power_on?).
--- a/drivers/serial/samsung.c
+++ b/drivers/serial/samsung.c
@@ -250,10 +250,14 @@ s3c24xx_serial_rx_chars(int irq, void *dev_id)
goto ignore_char;
}
- if (uerstat & S3C2410_UERSTAT_FRAME)
+ if (uerstat & S3C2410_UERSTAT_FRAME) {
+ dbg("S3C2410_UERSTAT_FRAME\n");
port->icount.frame++;
- if (uerstat & S3C2410_UERSTAT_OVERRUN)
+ }
+ if (uerstat & S3C2410_UERSTAT_OVERRUN) {
+ dbg("S3C2410_UERSTAT_OVERRUN\n");
port->icount.overrun++;
+ }
uerstat &= port->read_status_mask;
@@ -264,6 +268,7 @@ s3c24xx_serial_rx_chars(int irq, void *dev_id)
else if (uerstat & (S3C2410_UERSTAT_FRAME |
S3C2410_UERSTAT_OVERRUN))
flag = TTY_FRAME;
+ dbg("flag=%d\n", flag);
}
--- a/drivers/serial/samsung.h
+++ b/drivers/serial/samsung.h
@@ -98,10 +98,6 @@ console_initcall(s3c_serial_console_init)
#define s3c24xx_console_init(drv, inf) extern void no_console(void)
#endif
-#ifdef CONFIG_SERIAL_SAMSUNG_DEBUG
-
-extern void printascii(const char *);
-
static void dbg(const char *fmt, ...)
{
va_list va;
@@ -111,9 +107,5 @@ static void dbg(const char *fmt, ...)
vsprintf(buff, fmt, va);
va_end(va);
- printascii(buff);
+ printk(KERN_ERR "dbg:%s", buff);
}
-
-#else
-#define dbg(x...) do { } while (0)
-#endif
--
Ticket URL: <https://docs.openmoko.org/trac/ticket/2257#comment:24>
docs.openmoko.org <http://docs.openmoko.org/trac/>
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