Unverified Commit efffb014 authored by Cezary Rojewski's avatar Cezary Rojewski Committed by Mark Brown
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ALSA: hda: Introduce snd_hdac_stream_wait_drsm() 



Allow for waiting for DRSM bit for specified stream to be cleared from
HDAudio library level. Drivers may utilize this optional step during the
stream resume procedure.

Suggested-by: default avatarPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: default avatarCezary Rojewski <cezary.rojewski@intel.com>
Reviewed-by: default avatarTakashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20221027124702.1761002-4-cezary.rojewski@intel.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 2b9a50ea

include/sound/hdaudio.h

+1 −0
Original line number Diff line number Diff line
@@ -597,6 +597,7 @@ int snd_hdac_stream_get_spbmaxfifo(struct hdac_bus *bus, 
				   struct hdac_stream *azx_dev);

void snd_hdac_stream_drsm_enable(struct hdac_bus *bus,

				 bool enable, int index);

int snd_hdac_stream_wait_drsm(struct hdac_stream *azx_dev);

int snd_hdac_stream_set_dpibr(struct hdac_bus *bus,

			      struct hdac_stream *azx_dev, u32 value);

int snd_hdac_stream_set_lpib(struct hdac_stream *azx_dev, u32 value);

sound/hda/hdac_stream.c

+22 −0
Original line number Diff line number Diff line
@@ -821,6 +821,28 @@ void snd_hdac_stream_drsm_enable(struct hdac_bus *bus, 
}

EXPORT_SYMBOL_GPL(snd_hdac_stream_drsm_enable);



/*

 * snd_hdac_stream_wait_drsm - wait for HW to clear RSM for a stream

 * @azx_dev: HD-audio core stream to await RSM for

 *

 * Returns 0 on success and -ETIMEDOUT upon a timeout.

 */

int snd_hdac_stream_wait_drsm(struct hdac_stream *azx_dev)

{

	struct hdac_bus *bus = azx_dev->bus;

	u32 mask, reg;

	int ret;



	mask = 1 << azx_dev->index;



	ret = read_poll_timeout(snd_hdac_reg_readl, reg, !(reg & mask), 250, 2000, false, bus,

				bus->drsmcap + AZX_REG_DRSM_CTL);

	if (ret)

		dev_dbg(bus->dev, "polling RSM 0x%08x failed: %d\n", mask, ret);

	return ret;

}

EXPORT_SYMBOL_GPL(snd_hdac_stream_wait_drsm);



/**

 * snd_hdac_stream_set_dpibr - sets the dpibr value of a stream

 * @bus: HD-audio core bus