On 02/19/2015 06:25 PM, Steven Toth wrote:
I tried loading the driver with polling disabled and it fails completely:
[ 5526.693563] mn88472 7-0018: downloading firmware from file
'dvb-demod-mn88472-02.fw'
[ 5527.032209] mn88472 7-0018: firmware download failed=-32
[ 5527.033864] rtl2832 7-0010: i2c reg write failed -32
[ 5527.033874] r820t 8-003a: r820t_write: i2c wr failed=-32 reg=05 len=1:
83
[ 5527.036014] rtl2832 7-0010: i2c reg write failed -32
I have no idea why the device behaves so counter-intuitively. Is there
maybe some sorf of internal power-save mode the device enters when
there is no i2c traffic for a while or something?
IR polling does not use I2C but some own commands. Could you make more
tests. Use rtl28xxu module parameter to disable IR and test. It will disable
both IR interrupts and polling. Then make some tests with different IR
polling intervals to see how it behaves.
I have 3 mn88472 and 1 mn88473 device and all those seems to work fine for
me. I don't care to buy anymore devices to find out one which does not work.
Somehow root of cause should be find - it is not proper fix to repeat or
break I2C messages to multiple smaller ones.
Ack.
Its the job of the I2C controller to manage the I2C bus
implementation, including any fragmentation needs, not the
tuner/demod/other driver.
Find and fix the resource contention bug in the bridge and the mn88472
will work as is. I suspect something is broken with I2C locking.
It uses i2c control messages - single message per single operation.
You will need lock "control message" when it is done using multiple
messages, very typically two bulk message one for request and one for
reply - but that's not the case. Anyhow, it is possible firmware
rtl2832u firmware does not like some "large (larger than single
message)" operation is interrupted...
regards
Antti
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http://palosaari.fi/
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