The volume of rear channels can not be changed on GP platform

[RanderWang]

Both Topology and kernel need to be changed

[lgirdwood]

This looks like a feature (based on earlier call), please give more details of the feature here.

[RanderWang]

Hi Liam, I did many tests and have a new idea now. The issue is caused by info function in kcontrol. The default info function return only two or one channels to user. I hooked info function in kcontrol and return correct channel number, it works with alsalib which supports max 8 channels. So I want to hook info function to fix this issue.

But the soc-topology.c need to be refined. I have a discuss with Meng dong and we found It only allows get() and put() function can be hooked for a issue in design. you can refer to soc_tplg_kcontrol_bind_io to find hook logicality

How about your idea? Thank you!

[lgirdwood]

Please send a PR with changes and I'll review. Thanks

[RanderWang]

please review:
#34
thesofproject/linux#39

Thanks!