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i.MX28 SPI gpio-bitbang running 10x slower in 3.8.4

Question asked by Simon Pearson on Jun 17, 2013
Latest reply on Jun 21, 2013 by Fabio Estevam

A gpio-bitbang test app , which was running at approx 800kHz in 2.6.35.3 is now only running at 80kHz (on the same hardware). My SPI configuration in the .dtb file is similar to the 2.6.35 setup and the max-frequency is set at 50MHz so should not be throttling the throughput.

 

Anyone else experience the same degradation in performance?  Any suggestions what else in the system might be causing this slow-down?

 

Regards.

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