Hi Mark, I am sorry to disturb you. On our EK board, it use wm8904 codec. When I enable the audio, and use alsa utils aplay to test, I meet the following issue. The audio can not playback, it show the following error. ---8>--- #aplay 44.1k_16bit_stereo.wav Playing WAVE '44.1k_16bit_stereo.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo aplay: pcm_write:1737: write error: Input/output error ---<8---
After check the register, they are not be configured correctly. When read from debug file system, found the cache_dirty always Y before playback and also failed playback. I try to add the following two line in wm8904_set_bias_level into "case SND_SOC_BIAS_ON", it doesn't work. ---8>--- @@ -1832,9 +1834,12 @@ static int wm8904_set_bias_level(struct snd_soc_codec *codec,
switch (level) { case SND_SOC_BIAS_ON: + regcache_cache_only(wm8904->regmap, false); + regcache_sync(wm8904->regmap); break; ---<8---
However, If I comment the regcache_cache_only(wm8904->regmap, true) as following, then it play OK. ---8>--- @@ -2232,7 +2239,7 @@ static int wm8904_i2c_probe(struct i2c_client *i2c, WM8904_POBCTRL, 0);
/* Can leave the device powered off until we need it */ - regcache_cache_only(wm8904->regmap, true); + // regcache_cache_only(wm8904->regmap, true); ---<8---
So, any clue for this issue?
Thanks.
Best Regards, Bo Shen