diff options
Diffstat (limited to 'sound/soc/meson/axg-fifo.c')
| -rw-r--r-- | sound/soc/meson/axg-fifo.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/sound/soc/meson/axg-fifo.c b/sound/soc/meson/axg-fifo.c index 772eda857019..4365086c9a31 100644 --- a/sound/soc/meson/axg-fifo.c +++ b/sound/soc/meson/axg-fifo.c @@ -113,8 +113,10 @@ int axg_fifo_pcm_hw_params(struct snd_soc_component *component, { struct snd_pcm_runtime *runtime = ss->runtime; struct axg_fifo *fifo = axg_fifo_data(ss); + unsigned int burst_num, period, threshold; dma_addr_t end_ptr; - unsigned int burst_num; + + period = params_period_bytes(params); /* Setup dma memory pointers */ end_ptr = runtime->dma_addr + runtime->dma_bytes - AXG_FIFO_BURST; @@ -122,9 +124,25 @@ int axg_fifo_pcm_hw_params(struct snd_soc_component *component, regmap_write(fifo->map, FIFO_FINISH_ADDR, end_ptr); /* Setup interrupt periodicity */ - burst_num = params_period_bytes(params) / AXG_FIFO_BURST; + burst_num = period / AXG_FIFO_BURST; regmap_write(fifo->map, FIFO_INT_ADDR, burst_num); + /* + * Start the fifo request on the smallest of the following: + * - Half the fifo size + * - Half the period size + */ + threshold = min(period / 2, + (unsigned int)AXG_FIFO_MIN_DEPTH / 2); + + /* + * With the threshold in bytes, register value is: + * V = (threshold / burst) - 1 + */ + threshold /= AXG_FIFO_BURST; + regmap_field_write(fifo->field_threshold, + threshold ? threshold - 1 : 0); + /* Enable block count irq */ regmap_update_bits(fifo->map, FIFO_CTRL0, CTRL0_INT_EN(FIFO_INT_COUNT_REPEAT), @@ -347,6 +365,11 @@ int axg_fifo_probe(struct platform_device *pdev) return fifo->irq; } + fifo->field_threshold = + devm_regmap_field_alloc(dev, fifo->map, data->field_threshold); + if (IS_ERR(fifo->field_threshold)) + return PTR_ERR(fifo->field_threshold); + return devm_snd_soc_register_component(dev, data->component_drv, data->dai_drv, 1); } |