ASoC: meson: axg-fifo: relax period size constraints

Now that the fifo depths and thresholds are properly in the axg-fifo
driver, we can relax the constraints on period. As long as the period is a
multiple of the fifo burst size (8 bytes) things should be OK.
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20191218172420.1199117-5-jbrunet@baylibre.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/meson/axg-fifo.c

@@ -34,7 +34,7 @@ static struct snd_pcm_hardware axg_fifo_hw = {
 	.rate_max = 192000,
 	.channels_min = 1,
 	.channels_max = AXG_FIFO_CH_MAX,
-	.period_bytes_min = AXG_FIFO_MIN_DEPTH,
+	.period_bytes_min = AXG_FIFO_BURST,
 	.period_bytes_max = UINT_MAX,
 	.periods_min = 2,
 	.periods_max = UINT_MAX,
@@ -227,17 +227,17 @@ int axg_fifo_pcm_open(struct snd_soc_component *component,
 
 	/*
 	 * Make sure the buffer and period size are multiple of the FIFO
-	 * minimum depth size
+	 * burst
 	 */
 	ret = snd_pcm_hw_constraint_step(ss->runtime, 0,
 					 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
-					 AXG_FIFO_MIN_DEPTH);
+					 AXG_FIFO_BURST);
 	if (ret)
 		return ret;
 
 	ret = snd_pcm_hw_constraint_step(ss->runtime, 0,
 					 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
-					 AXG_FIFO_MIN_DEPTH);
+					 AXG_FIFO_BURST);
 	if (ret)
 		return ret;
 

sound/soc/meson/axg-fifo.h

@@ -31,8 +31,6 @@ struct snd_soc_pcm_runtime;
 					 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
 
 #define AXG_FIFO_BURST			8
-#define AXG_FIFO_MIN_CNT		64
-#define AXG_FIFO_MIN_DEPTH		(AXG_FIFO_BURST * AXG_FIFO_MIN_CNT)
 
 #define FIFO_INT_ADDR_FINISH		BIT(0)
 #define FIFO_INT_ADDR_INT		BIT(1)