I am using the tlv320aic31xx codec in my embedded device and I've noticed that, after forcing the unit into sleep and then, resume, I get a bunch of these errors: ``` tlv320aic31xx-codec 0-0018: ASoC: error at snd_soc_component_update_bits on tlv320aic31xx-codec.0-0018: -108 tlv320aic31xx-codec 0-0018: aic31xx_wait_bits: Failed! 0x25 was 0xcc239ca8 expected 0x0 (-108, 0x20, 0 us) tlv320aic31xx-codec 0-0018: ASoC: POST_PMD: HPL Driver event failed: -1 tlv320aic31xx-codec 0-0018: ASoC: error at snd_soc_component_update_bits on tlv320aic31xx-codec.0-0018: -108 tlv320aic31xx-codec 0-0018: ASoC: POST_PMD: SPL ClassD event failed: -108 tlv320aic31xx-codec 0-0018: ASoC: POST_PMD: SPR ClassD event failed: -108 tlv320aic31xx-codec 0-0018: ASoC: error at snd_soc_component_update_bits on tlv320aic31xx-codec.0-0018: -108 tlv320aic31xx-codec 0-0018: ASoC: error at snd_soc_component_update_bits on tlv320aic31xx-codec.0-0018: -108 tlv320aic31xx-codec 0-0018: ASoC: error at snd_soc_component_update_bits on tlv320aic31xx-codec.0-0018: -108 tlv320aic31xx-codec 0-0018: ASoC: error at snd_soc_component_update_bits on tlv320aic31xx-codec.0-0018: -108 tlv320aic31xx-codec 0-0018: ASoC: error at snd_soc_component_update_bits on tlv320aic31xx-codec.0-0018: -108 tlv320aic31xx-codec 0-0018: ASoC: error at snd_soc_component_update_bits on tlv320aic31xx-codec.0-0018: -108 tlv320aic31xx-codec 0-0018: ASoC: error at snd_soc_component_update_bits on tlv320aic31xx-codec.0-0018: -108 ```
When I look at he output of `dmesg`, I found this: ``` ------------[ cut here ]------------ WARNING: CPU: 0 PID: 1506 at drivers/i2c/i2c-core.h:54 __i2c_transfer+0xac/0xb4 i2c i2c-0: Transfer while suspended Modules linked in: rfcomm stm32_adc stm32_timer_trigger stm32_lptimer_trigger sha256_generic libsha256 sha256_arm snd_soc_simple_card snd_soc_simple_card_utils cfg80211 stm32_crc32 hci_uart btqca stm32_cryp libdes crypto_engine snd_soc_stm32_i2s snd_soc_tlv320aic31xx bluetooth stm32_adc_core snd_soc_core atmel_mxt_ts snd_pcm_dmaengine snd_pcm ecdh_generic snd_timer snd ecc sgm4151x_charger soundcore libaes [last unloaded: wlan] CPU: 0 PID: 1506 Comm: sh Tainted: G O 5.15.67 #1 Hardware name: STM32 (Device Tree Support) [<c010e8cc>] (unwind_backtrace) from [<c010c120>] (show_stack+0x10/0x14) [<c010c120>] (show_stack) from [<c011dc1c>] (__warn+0xec/0x148) [<c011dc1c>] (__warn) from [<c0bed42c>] (warn_slowpath_fmt+0x78/0xac) [<c0bed42c>] (warn_slowpath_fmt) from [<c092ecdc>] (__i2c_transfer+0xac/0xb4) [<c092ecdc>] (__i2c_transfer) from [<c092ed80>] (i2c_transfer+0x9c/0x138) [<c092ed80>] (i2c_transfer) from [<c06f5a40>] (regmap_i2c_read+0x5c/0x98) [<c06f5a40>] (regmap_i2c_read) from [<c06f0e2c>] (_regmap_raw_read+0x10c/0x2a8) [<c06f0e2c>] (_regmap_raw_read) from [<c06f1008>] (_regmap_bus_read+0x40/0x6c) [<c06f1008>] (_regmap_bus_read) from [<c06ef9c4>] (_regmap_read+0x60/0x14c) [<c06ef9c4>] (_regmap_read) from [<c06effdc>] (_regmap_update_bits+0xb4/0xf4) [<c06effdc>] (_regmap_update_bits) from [<c06f00c0>] (_regmap_select_page+0xa4/0x108) [<c06f00c0>] (_regmap_select_page) from [<c06f07a8>] (_regmap_raw_write_impl+0x684/0x968) [<c06f07a8>] (_regmap_raw_write_impl) from [<c06f0b04>] (_regmap_bus_raw_write+0x78/0xa0) [<c06f0b04>] (_regmap_bus_raw_write) from [<c06efe40>] (_regmap_write+0x4c/0x134) [<c06efe40>] (_regmap_write) from [<c06f0010>] (_regmap_update_bits+0xe8/0xf4) [<c06f0010>] (_regmap_update_bits) from [<c06f1820>] (regmap_update_bits_base+0x50/0x74) [<c06f1820>] (regmap_update_bits_base) from [<bf0d0980>] (snd_soc_component_update_bits+0x78/0x124 [snd_soc_core]) [<bf0d0980>] (snd_soc_component_update_bits [snd_soc_core]) from [<bf0daa20>] (dapm_seq_run_coalesced+0x14c/0x1a4 [snd_soc_core]) [<bf0daa20>] (dapm_seq_run_coalesced [snd_soc_core]) from [<bf0dab68>] (dapm_seq_run+0xf0/0x350 [snd_soc_core]) [<bf0dab68>] (dapm_seq_run [snd_soc_core]) from [<bf0db170>] (dapm_power_widgets+0x3a8/0x530 [snd_soc_core]) [<bf0db170>] (dapm_power_widgets [snd_soc_core]) from [<bf0cc214>] (snd_soc_dapm_sync+0x48/0x54 [snd_soc_core]) [<bf0cc214>] (snd_soc_dapm_sync [snd_soc_core]) from [<bf0c652c>] (snd_soc_suspend+0xf0/0x230 [snd_soc_core]) [<bf0c652c>] (snd_soc_suspend [snd_soc_core]) from [<c06df188>] (dpm_run_callback+0x48/0x134) [<c06df188>] (dpm_run_callback) from [<c06df58c>] (__device_suspend+0x11c/0x4c4) [<c06df58c>] (__device_suspend) from [<c06e1c10>] (dpm_suspend+0x148/0x2cc) [<c06e1c10>] (dpm_suspend) from [<c06e20e8>] (dpm_suspend_start+0x64/0x6c) [<c06e20e8>] (dpm_suspend_start) from [<c0159f00>] (suspend_devices_and_enter+0x150/0x2b4) [<c0159f00>] (suspend_devices_and_enter) from [<c0bede38>] (enter_state+0x204/0x250) [<c0bede38>] (enter_state) from [<c015a0a4>] (pm_suspend+0x40/0x98) [<c015a0a4>] (pm_suspend) from [<c0158ae4>] (state_store+0x68/0xc8) [<c0158ae4>] (state_store) from [<c0330a68>] (kernfs_fop_write_iter+0x10c/0x1cc) [<c0330a68>] (kernfs_fop_write_iter) from [<c028ea40>] (vfs_write+0x298/0x45c) [<c028ea40>] (vfs_write) from [<c028ed4c>] (ksys_write+0x60/0xe4) [<c028ed4c>] (ksys_write) from [<c0100060>] (ret_fast_syscall+0x0/0x48) Exception stack(0xcffcbfa8 to 0xcffcbff0) bfa0: 00000004 005ac7d8 00000001 005ac7d8 00000004 00000000 bfc0: 00000004 005ac7d8 00000001 00000004 b6f01680 bee896d8 005a8448 005a8590 bfe0: 005a6dfc bee89690 004fcda4 b6dcb4f8 ---[ end trace 75457fd792755cae ]--- ```
I've been trying for a few days, but I can't find the source of the problem or a way to solve it. Is there anything I might be missing?
I assume the problem is that it's trying to write to the registers after the suspend has happened, but I haven't been able to prove that either, and I wouldn't know how to fix that. Could that be what's happening here?
Thanks.