Not sure whether this should go to the dev or users list (or somewhere in
between) so I'll start off trying both.
I'm trying to port a wm8904 audio driver/codec to a new board and the new board
uses a device tree configuration which is new to both me and our project. The
target arm board uses a linux 3-10 kernel, I have the wm8904 on the i2c bus and
configured the Sound in the device tree to use an i2s controller. The codec and
platform driver are modprobed on startup.
I've made a lot of progress, I (finally!) have the codec loading/modprobed
properly and the platform driver probed and successful (up to a point), so I
have in the serial log:
[ 6.766524] snd_soc_card_avigilon sound.3: wm8904-hifi <-> 6000a000.i2s
mapping ok
And at the console:
# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: AVIGILONWM8904 [AVIGILON-WM8904], device 0: WM8904-STREAM wm8904-hifi-0
[]
Subdevices: 1/1
Subdevice #0: subdevice #0
# ls /proc/asound/
AVIGILONWM8904 card0 cards devices pcm
timers version
# cat /proc/asound/cards
0 [AVIGILONWM8904 ]: AVIGILON-WM8904 - AVIGILON-WM8904
AVIGILON-WM8904
But when I try to play a wave file, I get (no sound and):
# aplay -v audiocheck.net_sin_220Hz_0dBFS_10s.wav
Playing WAVE 'audiocheck.net_sin_220Hz_0dBFS_10s.wav' : Signed 16 bit Little
Endian, Rate 44100 Hz, Mono
aplay: set_params:1297: Unable to install hw params:
ACCESS: RW_INTERLEAVED
FORMAT: S16_LE
SUBFORMAT: STD
SAMPLE_BITS: 16
FRAME_BITS: 16
CHANNELS: 1
RATE: 44100
PERIOD_TIME: (46439 46440)
PERIOD_SIZE: 2048
PERIOD_BYTES: 4096
PERIODS: 11
BUFFER_TIME: (510839 510840)
BUFFER_SIZE: 22528
BUFFER_BYTES: 45056
TICK_TIME: 0
#
But (encouragingly) when I try this, I get my trace statement from the platform
driver:
[ 3794.140675] Calling avigilon_board_startup
in the serial log.
>From the canonical/generic platform driver file, the soc_snd_probe probe
>routine seems to be doing a bunch of dai link configuration and other stuff
>(including reading values out of the device tree) which I'm not currently
>doing in my equivalent probe routine. (And which I haven't been able to find
>any documentation for.)
So a few questions:
Am I correct in assuming that the " Unable to install hw params " error
indicates that something is missing at the board probe level? Any suggestions
about what's necessary to get it going?
Is there any documentation about what the board probe should be doing to set up
the hardware for playback properly?
Is the board startup routine required to do anything? (It didn't in the
non-device tree implementation which I'm taking it from.)
Any other useful hints or pointers? Is there a question which I should be
asking which I'm not?
Thanks in advance for any assistance which you might be able to provide, my
progress to date has involved a lot of trial and error and has been much slower
than I would like! ... N
Nou Dadoun
Senior Firmware Developer, Security Specialist
Office: 604.629.5182 ext 2632
Support: 888.281.5182 | avigilon.com
Follow Twitter | Follow LinkedIn
This email, including any files attached hereto (the "email"), contains
privileged and confidential information and is only for the intended
addressee(s). If this email has been sent to you in error, such sending does
not constitute waiver of privilege and we request that you kindly delete the
email and notify the sender. Any unauthorized use or disclosure of this email
is prohibited. Avigilon and certain other trade names used herein are the
registered and/or unregistered trademarks of Avigilon Corporation and/or its
affiliates in Canada and other jurisdictions worldwide.
------------------------------------------------------------------------------
Mobile security can be enabling, not merely restricting. Employees who
bring their own devices (BYOD) to work are irked by the imposition of MDM
restrictions. Mobile Device Manager Plus allows you to control only the
apps on BYO-devices by containerizing them, leaving personal data untouched!
https://ad.doubleclick.net/ddm/clk/304595813;131938128;j
_______________________________________________
Alsa-user mailing list
Alsa-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/alsa-user
