lkml.org 
[lkml]   [2021]   [Dec]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v4 05/22] ASoC: tegra20: spdif: Set FIFO trigger level
Date
FIFO trigger level must be not less than the size of DMA burst, otherwise
audio will be played x4 faster that it should be because part of the DMA
data will be dropped on FIFO input buffer overflow.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
sound/soc/tegra/tegra20_spdif.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/sound/soc/tegra/tegra20_spdif.c b/sound/soc/tegra/tegra20_spdif.c
index 7751575cd6d6..6f0570cde964 100644
--- a/sound/soc/tegra/tegra20_spdif.c
+++ b/sound/soc/tegra/tegra20_spdif.c
@@ -69,6 +69,14 @@ static int tegra20_spdif_hw_params(struct snd_pcm_substream *substream,

regmap_update_bits(spdif->regmap, TEGRA20_SPDIF_CTRL, mask, val);

+ /*
+ * FIFO trigger level must be bigger than DMA burst or equal to it,
+ * otherwise data is discarded on overflow.
+ */
+ regmap_update_bits(spdif->regmap, TEGRA20_SPDIF_DATA_FIFO_CSR,
+ TEGRA20_SPDIF_DATA_FIFO_CSR_TX_ATN_LVL_MASK,
+ TEGRA20_SPDIF_DATA_FIFO_CSR_TX_ATN_LVL_TU4_WORD_FULL);
+
switch (params_rate(params)) {
case 32000:
spdifclock = 4096000;
--
2.33.1
\
 
 \ /
  Last update: 2021-12-04 15:38    [W:0.213 / U:11.400 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site