Hi folks,
dear Rudolf,
I think I've solved the issue. As it is a very "heuristic" approach I can only
tell what I did and you can give me a commentary on it saying it makes no
sense this way or whatsoever ...
Nevertheless, I keep crash-looped now doing
while true; do
i2cdump -y 0 0x2d b > /dev/null
done
for more than 105000 times (the best value I had had reached before was around
20000, and only with debugging turned on) so I think it is fair to say things
have improved significantly at least.
I readily mentioned that I had had the impression that things were less
problematic with debugging turned on. Now, what does debugging do? It does
many printk's or printf's thereby making the process slower.
Rudolf pointed me to the file in charge: i2c-amd756.c. I simply added a single
msleep(1);
/usr/src/linux/drivers/i2c/busses/i2c-amd756.c (referring to linux-2.6.11.4):
static int amd756_transaction(struct i2c_adapter *adap)
{
int temp;
int result = 0;
int timeout = 0;
dev_dbg(&adap->dev, "Transaction (pre): GS=%04x, GE=%04x, ADD=%04x, "
"DAT=%04x\n", inw_p(SMB_GLOBAL_STATUS),
inw_p(SMB_GLOBAL_ENABLE), inw_p(SMB_HOST_ADDRESS),
inb_p(SMB_HOST_DATA));
/* Make sure the SMBus host is ready to start transmitting */
/* but always wait one millisecond just in case ... */
>> msleep(1); <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< Here!
if ((temp = inw_p(SMB_GLOBAL_STATUS)) & (GS_HST_STS | GS_SMB_STS)) {
and, until now, this seems to do the trick (knock on wood!!!). Tell me why
this cannot happen - as a matter of fact it seems to work. The explanation is
up to you, folks ;-).
Take care
Dieter Jurzitza
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