[linux-dvb] Re: driver reload in 2.6

[Michael Hunold <hunold@convergence.de>]

Hello Johannes,

Johannes Stezenbach wrote:
> Carlo E. Prelz wrote:
>
> > linux/drivers/media/common/saa7146-core.c (at least in the CVS version
> > that I use),  around line 380 you will find:
> >
> > 	/* we don't do a master reset here anymore, it screws up
> > 	   some boards that don't have an i2c-eeprom for configuration
> > 	   values */
> > /*
> > 	saa7146_write(dev, MC1, MASK_31);
> > */
> >
> > With this line commented out, reloading the modules does not reset my
> > budget card anymore. I uncommented it, and the locks I experienced
> > (and about which I posted a message to the list on 5 December, that
> > received no answers) are resolved with module reloading.
>
> Sorry 'bout that, but the problem description was unclear to me.
>
> @Michael: What's up with that saa7146 master reset thing?
Doing a master reset will set the saa7146 to the same state as after a 
power-on reset. (saa7146 specs, p. 33)

This includes loading subvendor/subsystem ids from an i2c eeprom, if 
present.

On the saa7146 based "Multimedia eXtension Board" which does not have an 
i2c eeprom, doing a master reset after system setup will cause the 
saa7740 audio helper chipset to misfunction -- it gets confused by the 
subvendor/subsystem query, locks the i2c bus and in turn locks the pci 
bus causing a system freeze.

Removing the reset did not change the behaviour of any card I have.
If the master reset really helps in your case, it's perhaps possible to 
add it to the budget driver code. I'll have to check that.

> Johannes
CU
Michael.


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