-----Original Message----- From: Takashi Sakamoto [mailto:o-takashi@sakamocchi.jp] Sent: Monday, July 18, 2016 11:43 AM
I know all of what you explained. Therefore, You misunderstand about my suggestion.
What I suggested is to drop a support of SNDRV_CTL_ELEM_ACCESS_USER flag from current topology implementation in userspace library, because current implementation of ALSA SoC part doesn't support it.
In ALSA SoC part, snd_ctl_new1() is called to add a control element set as a result of parsing binary blob generated by topology implementation.
In snd_ctl_new1(), SNDRV_CTL_ELEM_ACCESS_USER flag is dropped, in these lines: http://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/sound/core/... ontrol.c#n263
Totally, the flag cannot be supported by current implementation of topology in kernel. Thus, in userspace, we should drop this line to prevent users from confusions: http://git.alsa-project.org/?p=alsa-lib.git;a=blob;f=src/topology/ctl.c;h=b9... 8ac021ceecc116bc1087075743243e4b14055;hb=HEAD#l44
That's all what I mentioned. If something unclear, please tell it to me.
Yes, you're right. snd_ctl_new1() dropped SNDRV_CTL_ELEM_ACCESS_USER flag. I'll remove this from the topology user space tool to avoid confusion.
Thanks again Mengdong