On 01.02.2016 13:25, Maciej S. Szmigiero wrote:
On 01.02.2016 13:13, Fabio Estevam wrote:
Hi Maciej,
On Mon, Feb 1, 2016 at 10:07 AM, Maciej S. Szmigiero mail@maciej.szmigiero.name wrote:
Is regmap patch from http://www.spinics.net/lists/kernel/msg2161934.html applied to the tested tree?
Yes, linux-next 20160201 contains this patch.
Hmm, I will try to build this tree on UDOO board today and see what happens.
Looks like the problem occurs because commit 922a9f936e40 ("regmap: mmio: Convert to regmap_bus and fix accessor usage") has removed ->read callback from MMIO regmap implementation but it is used (via regmap_raw_read()) by regcache code to initialize cache if reg default values weren't provided explicitly.
If I revert this commit the SSI probes successfully again.
Looks like a possible solution would be to change regmap_raw_read() to do read using _regmap_read in case the cache is bypassed and there is no ->read callback defined for regmap implementation.
Maciej