Hi Devin,
On 02/01/13 14:19, Devin Heitmueller wrote:
On Fri, Feb 1, 2013 at 9:16 AM, Chris Clayton <chris2553@xxxxxxxxxxxxxx> wrote:
I've got some more diagnostics. I tuned on the 12c debugging in the cx23885
driver and ran the scan again. Surprisingly, the scan found 22 channels on a
single frequency (that carries the BBC channels). I've attached two files -
the output from dvbscan and the kernel log covering the loading of the
drivers and running the scan.
I'm no kernel guru, but is it possible that the root cause of the scan
failures is a timing problem which is being partially offset by the time
taken to produce all the debug output?
w_scan does have some arguments that let you increase the timeout for
tuning. You may wish to see if that has any effect. Maybe the w_scan
timeout is just too short for that device.
Yes, I noticed that but even with the tuning timeout set at medium or
longest, I doesn't find any channels. However, I've been following the
debug messages through the code and ended up at
drivers/media/pci/cx23885/cx23885-i2c.c.
I've found that by amending I2C_WAIT_DELAY from 32 to 64, I get improved
results from scanning. With that delay doubled, scandvb now finds 49
channels over 3 frequencies. That's with all debugging turned off, so no
extra delays provided by the production of debug messages.
I'll play around more tomorrow and update then.
Chris
Devin
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
