[alsa-devel] [PATCH] ALSA: dice: ensure transmission speed for transmitted packets

[Takashi Iwai]

On Tue, 03 Jan 2017 04:44:43 +0100,
Takashi Sakamoto wrote:
> 
> As of kernel 4.10, ALSA dice driver is expected to be used in default
> speed. In most cases, it's S400. While, IEEE 1394 specification describes
> the other speed such as S800.
> 
> According to 'TCD30XX User Guide', its link layer controller supports
> several transmission speed up to S800[0]. In Dice software interface,
> transmission speed in output direction can be configured by asynchronous
> transaction to 'TX_SPEED' offset in its address space. S800 may be
> available.
> 
> This commit improves configuration of transmission unit before starting
> packet streaming for this purpose. The value of 'max_speed' in 'fw_device'
> data structure has available maximum speed decided in bus arbitration,
> thus it's within capacity of the unit.
> 
> [0] TCD3xx User Guide - TCAT 1394 LLC, Revision 0.9.0-41360 (TC Applied Technologies, May 6 2015)
> http://www.tctechnologies.tc/index.php/support/support-hardware/dice-iii-detailed-documentation
> 
> Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>

Thanks, applied now.


Takashi