[alsa-devel] [PATCH v3 4/5] ALSA: hda: program stripe bits for controller

[Sameer Pujar]

Platforms having multiple SORs and hdmi/dp sinks require higher
bandwidth to support simultaneous playbacks of higher resolution.
If hda controller supports multiple SDO lines, STRIPE can be used
to indicate how many of the SDO lines the stream should be striped
across.

During stream start stripe control bits are programmed to use given
number of sdo lines and the same is cleared during stream stop.

Signed-off-by: Sameer Pujar <spujar at nvidia.com>
Reviewed-by: Mohan Kumar D <mkumard at nvidia.com>
Reviewed-by: Ravindra Lokhande <rlokhande at nvidia.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 sound/hda/hdac_stream.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sound/hda/hdac_stream.c b/sound/hda/hdac_stream.c
index 820694a..f5dd288 100644
--- a/sound/hda/hdac_stream.c
+++ b/sound/hda/hdac_stream.c
@@ -82,6 +82,7 @@ EXPORT_SYMBOL_GPL(snd_hdac_stream_init);
 void snd_hdac_stream_start(struct hdac_stream *azx_dev, bool fresh_start)
 {
 	struct hdac_bus *bus = azx_dev->bus;
+	int stripe_ctl;
 
 	trace_snd_hdac_stream_start(bus, azx_dev);
 
@@ -93,6 +94,10 @@ void snd_hdac_stream_start(struct hdac_stream *azx_dev, bool fresh_start)
 	snd_hdac_chip_updatel(bus, INTCTL,
 			      1 << azx_dev->index,
 			      1 << azx_dev->index);
+	/* set stripe control */
+	stripe_ctl = snd_hdac_get_stream_stripe_ctl(bus, azx_dev->substream);
+	snd_hdac_stream_updateb(azx_dev, SD_CTL_3B, SD_CTL_STRIPE_MASK,
+				stripe_ctl);
 	/* set DMA start and interrupt mask */
 	snd_hdac_stream_updateb(azx_dev, SD_CTL,
 				0, SD_CTL_DMA_START | SD_INT_MASK);
@@ -109,6 +114,7 @@ void snd_hdac_stream_clear(struct hdac_stream *azx_dev)
 	snd_hdac_stream_updateb(azx_dev, SD_CTL,
 				SD_CTL_DMA_START | SD_INT_MASK, 0);
 	snd_hdac_stream_writeb(azx_dev, SD_STS, SD_INT_MASK); /* to be sure */
+	snd_hdac_stream_updateb(azx_dev, SD_CTL_3B, SD_CTL_STRIPE_MASK, 0);
 	azx_dev->running = false;
 }
 EXPORT_SYMBOL_GPL(snd_hdac_stream_clear);
-- 
2.7.4


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