ALSA: hda: program stripe bits for controller

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@nvidia.com>
Reviewed-by: Mohan Kumar D <mkumard@nvidia.com>
Reviewed-by: Ravindra Lokhande <rlokhande@nvidia.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/hda/hdac_stream.c b/sound/hda/hdac_stream.c
index 820694a2061e951f819d42a85251f882f770ad78..f5dd288d1a7a39d9454bd1cf94a8e744601c07c1 100644 (file)
--- 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);