ALSA: hda: program stripe bits for controller (9b6f7e7a) · Commits · 戴 / test

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>

sound/hda/hdac_stream.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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);

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