summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorSameer Pujar <spujar@nvidia.com>2019-01-14 21:21:09 +0300
committerTakashi Iwai <tiwai@suse.de>2019-01-14 21:52:25 +0300
commit5dd3d271320d888bb708ca6252b8a9e416a7fe64 (patch)
tree5e2b78ca236aac463110802b9bef08fee612b406
parente6ce7943231fcba95a3c8842ab65f257cb5ab124 (diff)
downloadlinux-5dd3d271320d888bb708ca6252b8a9e416a7fe64.tar.xz
ALSA: hda: Add api to program stripe control bits
Controllers and codecs can support striping of audio out across multiple SDO lines. The number of supported SDO lines can be specific to chip. GCAP register can be read to know the maximum supported SDO lines. snd_hdac_get_stream_stripe_ctl() is exposed to program stripe bits on controller and codec side. stripe value: 0 for 1SDO, 1 for 2SDO, 2 for 4SDO lines, etc., 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>
-rw-r--r--include/sound/hdaudio.h3
-rw-r--r--sound/hda/hdac_stream.c34
2 files changed, 37 insertions, 0 deletions
diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h
index b4fa1c775251..45f944d57982 100644
--- a/include/sound/hdaudio.h
+++ b/include/sound/hdaudio.h
@@ -539,6 +539,9 @@ void snd_hdac_stream_sync(struct hdac_stream *azx_dev, bool start,
unsigned int streams);
void snd_hdac_stream_timecounter_init(struct hdac_stream *azx_dev,
unsigned int streams);
+int snd_hdac_get_stream_stripe_ctl(struct hdac_bus *bus,
+ struct snd_pcm_substream *substream);
+
/*
* macros for easy use
*/
diff --git a/sound/hda/hdac_stream.c b/sound/hda/hdac_stream.c
index ba73a33480b6..820694a2061e 100644
--- a/sound/hda/hdac_stream.c
+++ b/sound/hda/hdac_stream.c
@@ -13,6 +13,40 @@
#include "trace.h"
/**
+ * snd_hdac_get_stream_stripe_ctl - get stripe control value
+ * @bus: HD-audio core bus
+ * @substream: PCM substream
+ */
+int snd_hdac_get_stream_stripe_ctl(struct hdac_bus *bus,
+ struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ unsigned int channels = runtime->channels,
+ rate = runtime->rate,
+ bits_per_sample = runtime->sample_bits,
+ max_sdo_lines, value, sdo_line;
+
+ /* T_AZA_GCAP_NSDO is 1:2 bitfields in GCAP */
+ max_sdo_lines = snd_hdac_chip_readl(bus, GCAP) & AZX_GCAP_NSDO;
+
+ /* following is from HD audio spec */
+ for (sdo_line = max_sdo_lines; sdo_line > 0; sdo_line >>= 1) {
+ if (rate > 48000)
+ value = (channels * bits_per_sample *
+ (rate / 48000)) / sdo_line;
+ else
+ value = (channels * bits_per_sample) / sdo_line;
+
+ if (value >= 8)
+ break;
+ }
+
+ /* stripe value: 0 for 1SDO, 1 for 2SDO, 2 for 4SDO lines */
+ return sdo_line >> 1;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_get_stream_stripe_ctl);
+
+/**
* snd_hdac_stream_init - initialize each stream (aka device)
* @bus: HD-audio core bus
* @azx_dev: HD-audio core stream object to initialize