The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
Possible dependencies:
8b3a9ad86239 ("ASoC: jz4740-i2s: Handle independent FIFO flush bits") 48afb287853e ("ASoC: jz4740: use snd_soc_xxx_active()") 62f9ed5f8768 ("ASoC: jz4740-i2s: Avoid passing enum as match data") a42d9ba15cbf ("ASoC: jz4740-i2s: Add local dev variable in probe function") aa3c4765b3e8 ("ASoC: jz4740: jz4740-i2s: move .suspend/.resume to component") 67ad656bdd70 ("ASoC: jz4740: Use of_device_get_match_data()")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 8b3a9ad86239f80ed569e23c3954a311f66481d6 Mon Sep 17 00:00:00 2001 From: Aidan MacDonald aidanmacdonald.0x0@gmail.com Date: Sun, 23 Oct 2022 15:33:20 +0100 Subject: [PATCH] ASoC: jz4740-i2s: Handle independent FIFO flush bits
On the JZ4740, there is a single bit that flushes (empties) both the transmit and receive FIFO. Later SoCs have independent flush bits for each FIFO.
Independent FIFOs can be flushed before the snd_soc_dai_active() check because it won't disturb other active streams. This ensures that the FIFO we're about to use is always flushed before starting up. With shared FIFOs we can't do that because if another substream is active, flushing its FIFO would cause underrun errors.
This also fixes a bug: since we were only setting the JZ4740's flush bit, which corresponds to the TX FIFO flush bit on other SoCs, other SoCs were not having their RX FIFO flushed at all.
Fixes: 967beb2e8777 ("ASoC: jz4740: Add jz4780 support") Reviewed-by: Paul Cercueil paul@crapouillou.net Cc: stable@vger.kernel.org Signed-off-by: Aidan MacDonald aidanmacdonald.0x0@gmail.com Link: https://lore.kernel.org/r/20221023143328.160866-2-aidanmacdonald.0x0@gmail.c... Signed-off-by: Mark Brown broonie@kernel.org
diff --git a/sound/soc/jz4740/jz4740-i2s.c b/sound/soc/jz4740/jz4740-i2s.c index c4c1e89b47c1..83cb81999c6f 100644 --- a/sound/soc/jz4740/jz4740-i2s.c +++ b/sound/soc/jz4740/jz4740-i2s.c @@ -55,7 +55,8 @@ #define JZ_AIC_CTRL_MONO_TO_STEREO BIT(11) #define JZ_AIC_CTRL_SWITCH_ENDIANNESS BIT(10) #define JZ_AIC_CTRL_SIGNED_TO_UNSIGNED BIT(9) -#define JZ_AIC_CTRL_FLUSH BIT(8) +#define JZ_AIC_CTRL_TFLUSH BIT(8) +#define JZ_AIC_CTRL_RFLUSH BIT(7) #define JZ_AIC_CTRL_ENABLE_ROR_INT BIT(6) #define JZ_AIC_CTRL_ENABLE_TUR_INT BIT(5) #define JZ_AIC_CTRL_ENABLE_RFS_INT BIT(4) @@ -90,6 +91,8 @@ enum jz47xx_i2s_version { struct i2s_soc_info { enum jz47xx_i2s_version version; struct snd_soc_dai_driver *dai; + + bool shared_fifo_flush; };
struct jz4740_i2s { @@ -116,19 +119,44 @@ static inline void jz4740_i2s_write(const struct jz4740_i2s *i2s, writel(value, i2s->base + reg); }
+static inline void jz4740_i2s_set_bits(const struct jz4740_i2s *i2s, + unsigned int reg, uint32_t bits) +{ + uint32_t value = jz4740_i2s_read(i2s, reg); + value |= bits; + jz4740_i2s_write(i2s, reg, value); +} + static int jz4740_i2s_startup(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct jz4740_i2s *i2s = snd_soc_dai_get_drvdata(dai); - uint32_t conf, ctrl; + uint32_t conf; int ret;
+ /* + * When we can flush FIFOs independently, only flush the FIFO + * that is starting up. We can do this when the DAI is active + * because it does not disturb other active substreams. + */ + if (!i2s->soc_info->shared_fifo_flush) { + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + jz4740_i2s_set_bits(i2s, JZ_REG_AIC_CTRL, JZ_AIC_CTRL_TFLUSH); + else + jz4740_i2s_set_bits(i2s, JZ_REG_AIC_CTRL, JZ_AIC_CTRL_RFLUSH); + } + if (snd_soc_dai_active(dai)) return 0;
- ctrl = jz4740_i2s_read(i2s, JZ_REG_AIC_CTRL); - ctrl |= JZ_AIC_CTRL_FLUSH; - jz4740_i2s_write(i2s, JZ_REG_AIC_CTRL, ctrl); + /* + * When there is a shared flush bit for both FIFOs, the TFLUSH + * bit flushes both FIFOs. Flushing while the DAI is active would + * cause FIFO underruns in other active substreams so we have to + * guard this behind the snd_soc_dai_active() check. + */ + if (i2s->soc_info->shared_fifo_flush) + jz4740_i2s_set_bits(i2s, JZ_REG_AIC_CTRL, JZ_AIC_CTRL_TFLUSH);
ret = clk_prepare_enable(i2s->clk_i2s); if (ret) @@ -443,6 +471,7 @@ static struct snd_soc_dai_driver jz4740_i2s_dai = { static const struct i2s_soc_info jz4740_i2s_soc_info = { .version = JZ_I2S_JZ4740, .dai = &jz4740_i2s_dai, + .shared_fifo_flush = true, };
static const struct i2s_soc_info jz4760_i2s_soc_info = {