[SAA7134, REQUEST] slow register writing

[Dmitri Belimov <d.belimov@xxxxxxxxx>]

Hi All.

I wrote SPI bitbang master over GPIO of saa7134. Speed of writing is much slow then in a Windows systems.
I make some tests:

Windows, SPI bitbang 97002 bytes x 2 time of writing is around 1.2 seconds
Linux, SPI bitbang with call saa7134_set_gpio time of writing is 18 seconds
Linux, SPI bitbang without call saa7134_set_gpio time of writing is 0.25seconds.

The overhead of SPI subsystem is 0.25 seconds. Writing speed to registers of the saa7134
tooooo slooooow.

What you think about it?

With my best regards, Dmitry.
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