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71 lines
2.1 KiB
Diff
71 lines
2.1 KiB
Diff
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From 3454cbb46e2bf08b5506fff06029f082c7d59516 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Mon, 3 Jul 2023 09:08:16 +0100
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Subject: [PATCH 0546/1085] ASoC: dwc: Add DMACR handling
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Add control of the DMACR register, which is required for paced DMA
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(i.e. DREQ) support.
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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 | 11 +++++++++--
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sound/soc/dwc/local.h | 11 +++++++++++
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2 files changed, 20 insertions(+), 2 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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@@ -248,7 +248,7 @@ static void dw_i2s_config(struct dw_i2s_
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{
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u32 ch_reg;
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struct i2s_clk_config_data *config = &dev->config;
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-
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+ u32 dmacr = 0;
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i2s_disable_channels(dev, stream);
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@@ -260,6 +260,7 @@ static void dw_i2s_config(struct dw_i2s_
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dev->fifo_th - 1);
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i2s_write_reg(dev->i2s_base, TER(ch_reg), TER_TXCHEN |
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dev->tdm_mask << TER_TXSLOT_SHIFT);
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+ dmacr |= (DMACR_DMAEN_TXCH0 << ch_reg);
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} else {
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i2s_write_reg(dev->i2s_base, RCR(ch_reg),
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dev->xfer_resolution);
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@@ -267,9 +268,15 @@ static void dw_i2s_config(struct dw_i2s_
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dev->fifo_th - 1);
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i2s_write_reg(dev->i2s_base, RER(ch_reg), RER_RXCHEN |
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dev->tdm_mask << RER_RXSLOT_SHIFT);
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+ dmacr |= (DMACR_DMAEN_RXCH0 << ch_reg);
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}
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-
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}
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+ if (stream == SNDRV_PCM_STREAM_PLAYBACK)
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+ dmacr |= DMACR_DMAEN_TX;
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+ else if (stream == SNDRV_PCM_STREAM_CAPTURE)
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+ dmacr |= DMACR_DMAEN_RX;
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+
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+ i2s_write_reg(dev->i2s_base, I2S_DMACR, dmacr);
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}
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static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
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--- a/sound/soc/dwc/local.h
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+++ b/sound/soc/dwc/local.h
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@@ -63,6 +63,17 @@
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#define TER_TXSLOT_SHIFT 8
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#define TER_TXCHEN BIT(0)
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+#define DMACR_DMAEN_TX BIT(17)
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+#define DMACR_DMAEN_RX BIT(16)
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+#define DMACR_DMAEN_TXCH3 BIT(11)
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+#define DMACR_DMAEN_TXCH2 BIT(10)
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+#define DMACR_DMAEN_TXCH1 BIT(9)
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+#define DMACR_DMAEN_TXCH0 BIT(8)
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+#define DMACR_DMAEN_RXCH3 BIT(3)
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+#define DMACR_DMAEN_RXCH2 BIT(2)
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+#define DMACR_DMAEN_RXCH1 BIT(1)
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+#define DMACR_DMAEN_RXCH0 BIT(0)
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+
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/* I2SCOMPRegisters */
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#define I2S_COMP_PARAM_2 0x01F0
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#define I2S_COMP_PARAM_1 0x01F4
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