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ALSA: hda: program stripe bits for controller

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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 <[email protected]>
Reviewed-by: Mohan Kumar D <[email protected]>
Reviewed-by: Ravindra Lokhande <[email protected]>
Reviewed-by: Pierre-Louis Bossart <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
This commit is contained in:
Sameer Pujar authored and Takashi Iwai committed 2019-01-14 19:52:28 +01:00
1 parent b59c8e7a73
commit 9b6f7e7a29
1 file changed
+6
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sound/hda/hdac_stream.c
+6
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@@ -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);