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-det...
Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp
Thanks, applied now.
Takashi