From 0c93c291321f2ba8dc4cd3d4df74801caaa297db Mon Sep 17 00:00:00 2001 From: Olivier Moysan Date: Fri, 11 Oct 2019 10:48:16 +0200 Subject: ASoC: stm32: spdifrx: retry synchronization in sync state When STM32 SPDIFRX is in sync state, allow multiple synchro attempts, instead of exiting on first unsuccessful trial. This is useful when spdif signal is not immediately available on input. This also allows Pulseaudio to check iec capture device availability when no signal is present. Signed-off-by: Olivier Moysan Link: https://lore.kernel.org/r/20191011084816.14279-1-olivier.moysan@st.com Signed-off-by: Mark Brown --- sound/soc/stm/stm32_spdifrx.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) (limited to 'sound/soc/stm') diff --git a/sound/soc/stm/stm32_spdifrx.c b/sound/soc/stm/stm32_spdifrx.c index cd4b235fce57..3fd28ee01675 100644 --- a/sound/soc/stm/stm32_spdifrx.c +++ b/sound/soc/stm/stm32_spdifrx.c @@ -351,6 +351,8 @@ static int stm32_spdifrx_start_sync(struct stm32_spdifrx_data *spdifrx) SPDIFRX_CR_CUMSK | SPDIFRX_CR_PTMSK | SPDIFRX_CR_RXSTEO; cr_mask = cr; + cr |= SPDIFRX_CR_NBTRSET(SPDIFRX_NBTR_63); + cr_mask |= SPDIFRX_CR_NBTR_MASK; cr |= SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_SYNC); cr_mask |= SPDIFRX_CR_SPDIFEN_MASK; ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, @@ -666,7 +668,7 @@ static irqreturn_t stm32_spdifrx_isr(int irq, void *devid) struct snd_pcm_substream *substream = spdifrx->substream; struct platform_device *pdev = spdifrx->pdev; unsigned int cr, mask, sr, imr; - unsigned int flags; + unsigned int flags, sync_state; int err = 0, err_xrun = 0; regmap_read(spdifrx->regmap, STM32_SPDIFRX_SR, &sr); @@ -726,11 +728,23 @@ static irqreturn_t stm32_spdifrx_isr(int irq, void *devid) } if (err) { - /* SPDIFRX in STATE_STOP. Disable SPDIFRX to clear errors */ + regmap_read(spdifrx->regmap, STM32_SPDIFRX_CR, &cr); + sync_state = FIELD_GET(SPDIFRX_CR_SPDIFEN_MASK, cr) && + SPDIFRX_SPDIFEN_SYNC; + + /* SPDIFRX is in STATE_STOP. Disable SPDIFRX to clear errors */ cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_DISABLE); regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, SPDIFRX_CR_SPDIFEN_MASK, cr); + /* If SPDIFRX was in STATE_SYNC, retry synchro */ + if (sync_state) { + cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_SYNC); + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, + SPDIFRX_CR_SPDIFEN_MASK, cr); + return IRQ_HANDLED; + } + if (substream) snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED); -- cgit v1.2.3