By enabling dual fifo mode, it would allow SSI enter a better performance to transimit/receive data without occasional hardware underrun/overrun.
[ Passed compile-test with mpc85xx_defconfig ]
Signed-off-by: Nicolin Chen b42378@freescale.com --- sound/soc/fsl/fsl_ssi.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-)
diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c index 35e2773..0dfb7d6 100644 --- a/sound/soc/fsl/fsl_ssi.c +++ b/sound/soc/fsl/fsl_ssi.c @@ -143,6 +143,7 @@ struct fsl_ssi_private { bool ssi_on_imx; bool imx_ac97; bool use_dma; + bool use_dual_fifo; struct clk *clk; struct snd_dmaengine_dai_dma_data dma_params_tx; struct snd_dmaengine_dai_dma_data dma_params_rx; @@ -413,6 +414,16 @@ static int fsl_ssi_setup(struct fsl_ssi_private *ssi_private) write_ssi(CCSR_SSI_SOR_WAIT(3), &ssi->sor); }
+ 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); + } else { + write_ssi_mask(&ssi->srcr, CCSR_SSI_SRCR_RFEN1, 0); + write_ssi_mask(&ssi->stcr, CCSR_SSI_STCR_TFEN1, 0); + write_ssi_mask(&ssi->scr, CCSR_SSI_SCR_TCH_EN, 0); + } + return 0; }
@@ -947,7 +958,7 @@ static int fsl_ssi_probe(struct platform_device *pdev) ssi_private->fifo_depth = 8;
if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx21-ssi")) { - 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); @@ -1001,6 +1012,17 @@ static int fsl_ssi_probe(struct platform_device *pdev) dma_events[0], shared ? IMX_DMATYPE_SSI_SP : IMX_DMATYPE_SSI); imx_pcm_dma_params_init_data(&ssi_private->filter_data_rx, dma_events[1], shared ? IMX_DMATYPE_SSI_SP : IMX_DMATYPE_SSI); + 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 /= 2; + ssi_private->dma_params_tx.maxburst *= 2; + ssi_private->dma_params_rx.maxburst /= 2; + ssi_private->dma_params_rx.maxburst *= 2; + } } else if (ssi_private->use_dma) { /* The 'name' should not have any slashes in it. */ ret = devm_request_irq(&pdev->dev, ssi_private->irq,