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-rw-r--r--sound/soc/fsl/fsl_ssi.c28
1 files changed, 27 insertions, 1 deletions
diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index f9090b167ad7..6404e1ef20d0 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -164,6 +164,7 @@ struct fsl_ssi_private {
bool baudclk_locked;
bool irq_stats;
bool offline_config;
+ bool use_dual_fifo;
u8 i2s_mode;
spinlock_t baudclk_lock;
struct clk *baudclk;
@@ -721,6 +722,12 @@ static int fsl_ssi_setup(struct fsl_ssi_private *ssi_private)
CCSR_SSI_SxCCR_DC(2));
}
+ if (ssi_private->use_dual_fifo) {
+ write_ssi_mask(&ssi->srcr, 0, CCSR_SSI_SRCR_RFEN1);
+ write_ssi_mask(&ssi->stcr, 0, CCSR_SSI_STCR_TFEN1);
+ write_ssi_mask(&ssi->scr, 0, CCSR_SSI_SCR_TCH_EN);
+ }
+
return 0;
}
@@ -752,6 +759,15 @@ static int fsl_ssi_startup(struct snd_pcm_substream *substream,
spin_unlock_irqrestore(&ssi_private->baudclk_lock, flags);
}
+ /* When using dual fifo mode, it is safer to ensure an even period
+ * size. If appearing to an odd number while DMA always starts its
+ * task from fifo0, fifo1 would be neglected at the end of each
+ * period. But SSI would still access fifo1 with an invalid data.
+ */
+ if (ssi_private->use_dual_fifo)
+ snd_pcm_hw_constraint_step(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2);
+
return 0;
}
@@ -1370,7 +1386,7 @@ static int fsl_ssi_probe(struct platform_device *pdev)
if (hw_type == FSL_SSI_MX21 || hw_type == FSL_SSI_MX51 ||
hw_type == FSL_SSI_MX35) {
- u32 dma_events[2];
+ u32 dma_events[2], dmas[4];
ssi_private->ssi_on_imx = true;
ssi_private->clk = devm_clk_get(&pdev->dev, NULL);
@@ -1426,6 +1442,16 @@ static int fsl_ssi_probe(struct platform_device *pdev)
goto error_clk;
}
}
+ /* Should this be merge with the above? */
+ if (!of_property_read_u32_array(pdev->dev.of_node, "dmas", dmas, 4)
+ && dmas[2] == IMX_DMATYPE_SSI_DUAL) {
+ ssi_private->use_dual_fifo = true;
+ /* When using dual fifo mode, we need to keep watermark
+ * as even numbers due to dma script limitation.
+ */
+ ssi_private->dma_params_tx.maxburst &= ~0x1;
+ ssi_private->dma_params_rx.maxburst &= ~0x1;
+ }
shared = of_device_is_compatible(of_get_parent(np),
"fsl,spba-bus");