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89 lines
2.6 KiB
Diff
89 lines
2.6 KiB
Diff
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From db9d903ae06b19201bc307be3dff716a1f2c5a80 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Fri, 21 Jul 2023 12:07:16 +0100
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Subject: [PATCH 0548/1085] ASOC: dwc: Fix 16-bit audio handling
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IMO the Synopsys datasheet could be clearer in this area, but it seems
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that the DMA data ports (DMATX and DMARX) expect left and right samples
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in alternate writes; if a stereo pair is pushed in a single 32-bit
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write, the upper half is ignored, leading to double speed audio with a
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confused stereo image. Make sure the necessary changes happen by
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updating the DMA configuration data in the hw_params method.
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The set_bclk_ratio change was made at a time when it looked like it
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could be causing an error, but I think the division of responsibilities
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is clearer this way (and the kernel log clearer without the info-level
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message).
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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sound/soc/dwc/dwc-i2s.c | 22 +++++++++++++++-------
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1 file changed, 15 insertions(+), 7 deletions(-)
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--- a/sound/soc/dwc/dwc-i2s.c
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+++ b/sound/soc/dwc/dwc-i2s.c
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@@ -271,23 +271,34 @@ static int dw_i2s_hw_params(struct snd_p
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{
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struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
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struct i2s_clk_config_data *config = &dev->config;
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+ union dw_i2s_snd_dma_data *dma_data = NULL;
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int ret;
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+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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+ dma_data = &dev->play_dma_data;
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+ else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
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+ dma_data = &dev->capture_dma_data;
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+ else
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+ return -1;
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+
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switch (params_format(params)) {
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case SNDRV_PCM_FORMAT_S16_LE:
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config->data_width = 16;
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+ dma_data->dt.addr_width = 2;
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dev->ccr = 0x00;
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dev->xfer_resolution = 0x02;
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break;
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case SNDRV_PCM_FORMAT_S24_LE:
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config->data_width = 24;
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+ dma_data->dt.addr_width = 4;
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dev->ccr = 0x08;
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dev->xfer_resolution = 0x04;
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break;
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case SNDRV_PCM_FORMAT_S32_LE:
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config->data_width = 32;
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+ dma_data->dt.addr_width = 4;
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dev->ccr = 0x10;
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dev->xfer_resolution = 0x05;
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break;
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@@ -519,24 +530,21 @@ static int dw_i2s_set_bclk_ratio(struct
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struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
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struct i2s_clk_config_data *config = &dev->config;
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- dev_err(dev->dev, "%s(%d)\n", __func__, ratio);
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+ dev_dbg(dev->dev, "%s(%d)\n", __func__, ratio);
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+ if (ratio < config->data_width * 2)
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+ return -EINVAL;
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+
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switch (ratio) {
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case 32:
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- config->data_width = 16;
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dev->ccr = 0x00;
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- dev->xfer_resolution = 0x02;
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break;
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case 48:
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- config->data_width = 24;
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dev->ccr = 0x08;
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- dev->xfer_resolution = 0x04;
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break;
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case 64:
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- config->data_width = 32;
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dev->ccr = 0x10;
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- dev->xfer_resolution = 0x05;
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break;
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default:
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return -EINVAL;
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