[linux-dvb] syslog: av7110_fw_request: timeout waiting for HANDSHAKE_REG - What does this mean?

[Sebastian]

On Tue, Jun 14, 2005 at 02:03:09AM +0200, Johannes Stezenbach wrote:
> On Wed, Jun 08, 2005 at 03:53:44AM -0700, C.Y.M wrote:
> > Johannes Stezenbach wrote:
> > > On Fri, Jun 03, 2005 at 10:06:52AM +0200, Sebastian wrote:
> > > 
> > >>Jun  3 05:31:43 hal9000 av7110_fw_request: timeout waiting for HANDSHAKE_REG
> > > 
> > > I don't know what causes it. The error message means the firmware
> > > crashed (or it's internal state got confused) in a different than
> > > the usual location.
> > 
> > I am able to reproduce this "handshake" error by maxing my cpu and then using an
> > application that outputs through the FF card.  For example.. I start mencoder to
> > encode an mpeg file which pretty much uses all the cpu on my machine.  Then, I
> > use mplayer to output a mpg file with mpegpes while the machine is still
> > encoding the other file.  Almost immediately I start finding "av7110_fw_request:
> > timeout waiting for HANDSHAKE_REG" in the syslog. If I am not maxing out my cpu
> > (ie; encoding a file) while I play a mpg via mpegpes, then the errors do not occur.
> 
> I just fixed a bug in timeout handling:
> 
>         start = jiffies;
>         while (rdebi(av7110, DEBINOSWAP, COMMAND, 0, 2 )) {
> -               msleep(1);
>                 if (time_after(jiffies, start + ARM_WAIT_FREE)) {
>                         printk(KERN_ERR "dvb-ttpci: %s(): timeout waiting for COMMAND idle\n", __FUNCTION__);
>                         return -ETIMEDOUT;
>                 }
> +               msleep(1);
>         }
> 
> (multiple occurences)
> 
> When the machine is busy, msleep(1) can sleep unexpectedly long.
> Additionally, it doesn't make sense to sleep and then exit with
> a timeout without retesting the condition we're waiting for.
> 
> Please test current CVS if this fixes the HANDSHAKE_REG timeout for you.
> 
> Johannes
> 
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> 
Awesome, thanks! I'll try and report tomorrow.

Cheers
S.
-- 
"What the fuck are we doing out here in the middle of the desert?" - A foreigner, propably Samoan