mirror of
https://github.com/Ysurac/openmptcprouter.git
synced 2025-03-09 15:40:20 +00:00
88 lines
2.6 KiB
Diff
88 lines
2.6 KiB
Diff
From f6ab00ebc02e1411f70fae060d5ebba9b2227840 Mon Sep 17 00:00:00 2001
|
|
From: Phil Elwell <phil@raspberrypi.com>
|
|
Date: Fri, 21 Jul 2023 12:07:16 +0100
|
|
Subject: [PATCH] ASOC: dwc: Fix 16-bit audio handling
|
|
|
|
IMO the Synopsys datasheet could be clearer in this area, but it seems
|
|
that the DMA data ports (DMATX and DMARX) expect left and right samples
|
|
in alternate writes; if a stereo pair is pushed in a single 32-bit
|
|
write, the upper half is ignored, leading to double speed audio with a
|
|
confused stereo image. Make sure the necessary changes happen by
|
|
updating the DMA configuration data in the hw_params method.
|
|
|
|
The set_bclk_ratio change was made at a time when it looked like it
|
|
could be causing an error, but I think the division of responsibilities
|
|
is clearer this way (and the kernel log clearer without the info-level
|
|
message).
|
|
|
|
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
|
|
---
|
|
sound/soc/dwc/dwc-i2s.c | 22 +++++++++++++++-------
|
|
1 file changed, 15 insertions(+), 7 deletions(-)
|
|
|
|
--- a/sound/soc/dwc/dwc-i2s.c
|
|
+++ b/sound/soc/dwc/dwc-i2s.c
|
|
@@ -223,23 +223,34 @@ static int dw_i2s_hw_params(struct snd_p
|
|
{
|
|
struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
|
|
struct i2s_clk_config_data *config = &dev->config;
|
|
+ union dw_i2s_snd_dma_data *dma_data = NULL;
|
|
int ret;
|
|
|
|
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
|
|
+ dma_data = &dev->play_dma_data;
|
|
+ else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
|
|
+ dma_data = &dev->capture_dma_data;
|
|
+ else
|
|
+ return -1;
|
|
+
|
|
switch (params_format(params)) {
|
|
case SNDRV_PCM_FORMAT_S16_LE:
|
|
config->data_width = 16;
|
|
+ dma_data->dt.addr_width = 2;
|
|
dev->ccr = 0x00;
|
|
dev->xfer_resolution = 0x02;
|
|
break;
|
|
|
|
case SNDRV_PCM_FORMAT_S24_LE:
|
|
config->data_width = 24;
|
|
+ dma_data->dt.addr_width = 4;
|
|
dev->ccr = 0x08;
|
|
dev->xfer_resolution = 0x04;
|
|
break;
|
|
|
|
case SNDRV_PCM_FORMAT_S32_LE:
|
|
config->data_width = 32;
|
|
+ dma_data->dt.addr_width = 4;
|
|
dev->ccr = 0x10;
|
|
dev->xfer_resolution = 0x05;
|
|
break;
|
|
@@ -418,24 +429,21 @@ static int dw_i2s_set_bclk_ratio(struct
|
|
struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
|
|
struct i2s_clk_config_data *config = &dev->config;
|
|
|
|
- dev_err(dev->dev, "%s(%d)\n", __func__, ratio);
|
|
+ dev_dbg(dev->dev, "%s(%d)\n", __func__, ratio);
|
|
+ if (ratio < config->data_width * 2)
|
|
+ return -EINVAL;
|
|
+
|
|
switch (ratio) {
|
|
case 32:
|
|
- config->data_width = 16;
|
|
dev->ccr = 0x00;
|
|
- dev->xfer_resolution = 0x02;
|
|
break;
|
|
|
|
case 48:
|
|
- config->data_width = 24;
|
|
dev->ccr = 0x08;
|
|
- dev->xfer_resolution = 0x04;
|
|
break;
|
|
|
|
case 64:
|
|
- config->data_width = 32;
|
|
dev->ccr = 0x10;
|
|
- dev->xfer_resolution = 0x05;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|