[v2,4/5] ALSA: hda: program stripe bits for controller
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Message ID 1547227328-32558-5-git-send-email-spujar@nvidia.com
State New
Headers show
Series
  • Stripe control functionality
Related show

Commit Message

Sameer Pujar Jan. 11, 2019, 5:22 p.m. UTC
Platforms having multiple 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@nvidia.com>
Reviewed-by: Mohan Kumar D <mkumard@nvidia.com>
Reviewed-by: Ravindra Lokhande <rlokhande@nvidia.com>
---
 sound/hda/hdac_stream.c | 6 ++++++
 1 file changed, 6 insertions(+)

Patch
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diff --git a/sound/hda/hdac_stream.c b/sound/hda/hdac_stream.c
index b403b05..7b71da0 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);
 
@@ -91,6 +92,10 @@  void snd_hdac_stream_start(struct hdac_stream *azx_dev, bool fresh_start)
 
 	/* enable SIE */
 	snd_hdac_chip_updatel(bus, INTCTL, 0, 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);
@@ -107,6 +112,7 @@  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);