Hi Karthik,
I don't find any clue as of now. I don't know why my audio interface is
not working which was working perfectly on kernel 2.4.20. I don't find
much difference in audio class drivers of kernel 2.4.20 and kernel 2.6.
I chekced with few audio settings also . Even in case of video capture
driver I am getting video at a very slow rate from the camcoreder. i
checked with the analyzer and there is no difference in data transfer
of 2.4 and 2.6. it is 8 ms. In fact in case of high speed USB it should
be much faster as we observed on MS windows and Apple Mac OS X.
Regards
Anil
On 6/7/05, karthik.bala <[EMAIL PROTECTED]> wrote:
> Hi,
> Actually, what is the status of ur problem now ??
> Have u solved it ??
>
> Karthik bala guru
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:
[EMAIL PROTECTED]] On Behalf Of Anil
> Yadav
> Sent: Sunday, June 05, 2005 2:37 PM
> To: David Brownell; [email protected]
;
> [EMAIL PROTECTED]; [EMAIL PROTECTED]
> Subject: [Linux-usb-users] Re:Re:Problem with EHCI
>
>
> Sorry for using different e-mail id, I tried to send the reply but my
> mail is getting bounced from that account.
>
> Thanks David,
> I tried the audio class driver of kernel 2.6.9 and found the host
> controller sending ISO tokens
>
> at 125 us. I used same application to get the audio sample in user space
> but surprisingly it is
>
> sending all zeros.I did check the usb_audio_read() of both kernel
> versions, there's not much
>
> difference in the reading mechanism. My application is based on OSS
> api's. On kernel 2.4 for full speed there wasn't any problem as such.I
> was able to capture and playback. But this time I am only getting zeros
> and that too at a damn slow rate. I don't think i am able to do the
> read. Even i tried alsa libs for capture but it didn't work for me. Then
> I modified my video capture driver for kernel 2.6.9 and I have been able
> to get the video continuously with the same URB which I mentioned in my
> last query in kernel 2.4. The difference being 2.6 doesn't hang.I
> capture the video for around 30-35 minutes. The only problem with my
> implementation is I didn't find any difference between the frame rates I
> got with both the kernels. Its same for both as the analyzer output
> shows. I guess the device doesn't fetch the data at high speed usb's
> expectation.. But I am able to get much higher capture rate on MS
> windows.
>
> Thanks in Advance
> Regards
> Anil
>
>
>
>
> On Sunday 29 May 2005 6:03 am, Anil Yadav wrote:
>
> > I tried almost all possible combinations to frame urb. I checked with
> > kernels from 2.4.20 to 2.4.30.
>
> I'd not recommend a 2.4 kernel for your application. Try the latest 2.6
> code, possibly with the patch from:
>
>
>
> Also, make sure your ISO code works with for example OHCI on
2.6; you
> may have problems in your ISO logic, apart from any potential EHCI
> issues. (Differences at high speed will include data rate, polling
> interval -- units in uframes, not frames -- and possibly per-period
> data size of up to 3 KB.) And the behavior for ISO changed in 2.6; a
> pointless "automagic resubmit" mechanism is gone. (Which was never
> implemented for EHCI in 2.4 fwiw ... the 2.6 approach works just fine on
> 2.4 though, with all HCDs.)
>
>
> > Is there any driver available in the kernel ( Isochronous) for high
> > speed device. By the way my kernel version is 2.4.20-8.
>
> Definitely do NOT use EHCI in any version before
2.4.22 ... there are
> some 2.4 versions with ISO support that may work for high speed ISO, but
> I don't know which ones they'd be. Certainly 2.4.20 is strongly
> discouraged. As I said, 2.6.recent ... plus maybe the patch above.
>
> Once it's working on 2.6, the iso code may work on newish 2.4 kernels.
>
> - dave
>
>
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- Re: [Linux-usb-users] Re:Re:Problem with EHCI Anil Yadav
