This is a note to let you know that I've just added the patch titled ASoC: meson: aiu: Move AIU_I2S_MISC hold setting to aiu-fifo-i2s to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: asoc-meson-aiu-move-aiu_i2s_misc-hold-setting-to-aiu-fifo-i2s.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From ee907afb0c39a41ee74b862882cfe12820c74b98 Mon Sep 17 00:00:00 2001 From: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx> Date: Mon, 6 Dec 2021 22:08:04 +0100 Subject: ASoC: meson: aiu: Move AIU_I2S_MISC hold setting to aiu-fifo-i2s From: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx> commit ee907afb0c39a41ee74b862882cfe12820c74b98 upstream. The out-of-tree vendor driver uses the following approach to set the AIU_I2S_MISC register: 1) write AIU_MEM_I2S_START_PTR and AIU_MEM_I2S_RD_PTR 2) configure AIU_I2S_MUTE_SWAP[15:0] 3) write AIU_MEM_I2S_END_PTR 4) set AIU_I2S_MISC[2] to 1 (documented as: "put I2S interface in hold mode") 5) set AIU_I2S_MISC[4] to 1 (depending on the driver revision it always stays at 1 while for older drivers this bit is unset in step 4) 6) set AIU_I2S_MISC[2] to 0 7) write AIU_MEM_I2S_MASKS 8) toggle AIU_MEM_I2S_CONTROL[0] 9) toggle AIU_MEM_I2S_BUF_CNTL[0] Move setting the AIU_I2S_MISC[2] bit to aiu_fifo_i2s_hw_params() so it resembles the flow in the vendor kernel more closely. While here also configure AIU_I2S_MISC[4] (documented as: "force each audio data to left or right according to the bit attached with the audio data") similar to how the vendor driver does this. This fixes the infamous and long-standing "machine gun noise" issue (a buffer underrun issue). Fixes: 6ae9ca9ce986bf ("ASoC: meson: aiu: add i2s and spdif support") Reported-by: Christian Hewitt <christianshewitt@xxxxxxxxx> Reported-by: Geraldo Nascimento <geraldogabriel@xxxxxxxxx> Tested-by: Christian Hewitt <christianshewitt@xxxxxxxxx> Tested-by: Geraldo Nascimento <geraldogabriel@xxxxxxxxx> Acked-by: Jerome Brunet <jbrunet@xxxxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20211206210804.2512999-3-martin.blumenstingl@xxxxxxxxxxxxxx Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- sound/soc/meson/aiu-encoder-i2s.c | 33 --------------------------------- sound/soc/meson/aiu-fifo-i2s.c | 19 +++++++++++++++++++ 2 files changed, 19 insertions(+), 33 deletions(-) --- a/sound/soc/meson/aiu-encoder-i2s.c +++ b/sound/soc/meson/aiu-encoder-i2s.c @@ -18,7 +18,6 @@ #define AIU_RST_SOFT_I2S_FAST BIT(0) #define AIU_I2S_DAC_CFG_MSB_FIRST BIT(2) -#define AIU_I2S_MISC_HOLD_EN BIT(2) #define AIU_CLK_CTRL_I2S_DIV_EN BIT(0) #define AIU_CLK_CTRL_I2S_DIV GENMASK(3, 2) #define AIU_CLK_CTRL_AOCLK_INVERT BIT(6) @@ -36,37 +35,6 @@ static void aiu_encoder_i2s_divider_enab enable ? AIU_CLK_CTRL_I2S_DIV_EN : 0); } -static void aiu_encoder_i2s_hold(struct snd_soc_component *component, - bool enable) -{ - snd_soc_component_update_bits(component, AIU_I2S_MISC, - AIU_I2S_MISC_HOLD_EN, - enable ? AIU_I2S_MISC_HOLD_EN : 0); -} - -static int aiu_encoder_i2s_trigger(struct snd_pcm_substream *substream, int cmd, - struct snd_soc_dai *dai) -{ - struct snd_soc_component *component = dai->component; - - switch (cmd) { - case SNDRV_PCM_TRIGGER_START: - case SNDRV_PCM_TRIGGER_RESUME: - case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: - aiu_encoder_i2s_hold(component, false); - return 0; - - case SNDRV_PCM_TRIGGER_STOP: - case SNDRV_PCM_TRIGGER_SUSPEND: - case SNDRV_PCM_TRIGGER_PAUSE_PUSH: - aiu_encoder_i2s_hold(component, true); - return 0; - - default: - return -EINVAL; - } -} - static int aiu_encoder_i2s_setup_desc(struct snd_soc_component *component, struct snd_pcm_hw_params *params) { @@ -353,7 +321,6 @@ static void aiu_encoder_i2s_shutdown(str } const struct snd_soc_dai_ops aiu_encoder_i2s_dai_ops = { - .trigger = aiu_encoder_i2s_trigger, .hw_params = aiu_encoder_i2s_hw_params, .hw_free = aiu_encoder_i2s_hw_free, .set_fmt = aiu_encoder_i2s_set_fmt, --- a/sound/soc/meson/aiu-fifo-i2s.c +++ b/sound/soc/meson/aiu-fifo-i2s.c @@ -20,6 +20,8 @@ #define AIU_MEM_I2S_CONTROL_MODE_16BIT BIT(6) #define AIU_MEM_I2S_BUF_CNTL_INIT BIT(0) #define AIU_RST_SOFT_I2S_FAST BIT(0) +#define AIU_I2S_MISC_HOLD_EN BIT(2) +#define AIU_I2S_MISC_FORCE_LEFT_RIGHT BIT(4) #define AIU_FIFO_I2S_BLOCK 256 @@ -90,6 +92,10 @@ static int aiu_fifo_i2s_hw_params(struct unsigned int val; int ret; + snd_soc_component_update_bits(component, AIU_I2S_MISC, + AIU_I2S_MISC_HOLD_EN, + AIU_I2S_MISC_HOLD_EN); + ret = aiu_fifo_hw_params(substream, params, dai); if (ret) return ret; @@ -117,6 +123,19 @@ static int aiu_fifo_i2s_hw_params(struct snd_soc_component_update_bits(component, AIU_MEM_I2S_MASKS, AIU_MEM_I2S_MASKS_IRQ_BLOCK, val); + /* + * Most (all?) supported SoCs have this bit set by default. The vendor + * driver however sets it manually (depending on the version either + * while un-setting AIU_I2S_MISC_HOLD_EN or right before that). Follow + * the same approach for consistency with the vendor driver. + */ + snd_soc_component_update_bits(component, AIU_I2S_MISC, + AIU_I2S_MISC_FORCE_LEFT_RIGHT, + AIU_I2S_MISC_FORCE_LEFT_RIGHT); + + snd_soc_component_update_bits(component, AIU_I2S_MISC, + AIU_I2S_MISC_HOLD_EN, 0); + return 0; } Patches currently in stable-queue which might be from martin.blumenstingl@xxxxxxxxxxxxxx are queue-5.15/asoc-meson-aiu-move-aiu_i2s_misc-hold-setting-to-aiu-fifo-i2s.patch queue-5.15/asoc-meson-aiu-fifo-add-missing-dma_coerce_mask_and_.patch