imx-ssi in master mode?

imx-ssi in master mode?

[Sven Zeisberg]

  Hi

I found that the i.MX25 can not transfer multichannels frames through 
SSI when it is set up as slave.
(when the i.MX25 SSI is set up as slave, the SSI is set to "normal" mode 
in which only one word per frame is transfered)

Now I'm wondering if anybody has successfully used a codec with the 
i.MX25 SSI set up as Master. When we do this here, we can see that the 
i.MX25 is generating the bit clock but no frame sync.

BR
Sven

imx-ssi in master mode?

[Sven Zeisberg]

  Hi

I found that the i.MX25 can not transfer multichannels frames through 
SSI when it is set up as slave.
(when the i.MX25 SSI is set up as slave, the SSI is set to "normal" mode 
in which only one word per frame is transfered)

Now I'm wondering if anybody has successfully used a codec with the 
i.MX25 SSI set up as Master. When we do this here, we can see that the 
i.MX25 is generating the bit clock but no frame sync.

BR
Sven

Re: imx-ssi in master mode?

[Timur Tabi]

On Thu, Aug 26, 2010 at 10:30 AM, Sven Zeisberg
<sven.zeisberg@googlemail.com> wrote:

> Now I'm wondering if anybody has successfully used a codec with the
> i.MX25 SSI set up as Master. When we do this here, we can see that the
> i.MX25 is generating the bit clock but no frame sync.

This is board-dependent.  That is, you would need to have a board that
was wired up for the SSI to be in master mode before you can start
working on the driver.

-- 
Timur Tabi
Linux kernel developer at Freescale

Re: imx-ssi in master mode?

[Sascha Hauer]

On Thu, Aug 26, 2010 at 05:23:53PM +0200, Sven Zeisberg wrote:
>   Hi
> 
> I found that the i.MX25 can not transfer multichannels frames through 
> SSI when it is set up as slave.
> (when the i.MX25 SSI is set up as slave, the SSI is set to "normal" mode 
> in which only one word per frame is transfered)
> 
> Now I'm wondering if anybody has successfully used a codec with the 
> i.MX25 SSI set up as Master. When we do this here, we can see that the 
> i.MX25 is generating the bit clock but no frame sync.

Master mode is currently not supported by the i.MX driver. You'd have to
implement the clk_get_rate functions for the ssi clocks first before
implementing the missing pieces in the driver.

Sascha


-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

Re: imx-ssi in master mode?

[Sven Zeisberg]

  Hi Sascha,

again - thanks for your help! We start working on this now and hopefully 
return soon with results...


Sven


Am 27.08.2010 13:54, schrieb Sascha Hauer:
> On Thu, Aug 26, 2010 at 05:23:53PM +0200, Sven Zeisberg wrote:
>>    Hi
>>
>> I found that the i.MX25 can not transfer multichannels frames through
>> SSI when it is set up as slave.
>> (when the i.MX25 SSI is set up as slave, the SSI is set to "normal" mode
>> in which only one word per frame is transfered)
>>
>> Now I'm wondering if anybody has successfully used a codec with the
>> i.MX25 SSI set up as Master. When we do this here, we can see that the
>> i.MX25 is generating the bit clock but no frame sync.
> Master mode is currently not supported by the i.MX driver. You'd have to
> implement the clk_get_rate functions for the ssi clocks first before
> implementing the missing pieces in the driver.
>
> Sascha
>
>