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ALSA: hda: Introduce snd_hdac_stream_wait_drsm() 

commit efffb01447 upstream.

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: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20221027124702.1761002-4-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Cezary Rojewski 2022-10-27 14:46:56 +02:00
parent 4863dded80
commit 9d90994abd
2 changed files with 23 additions and 0 deletions
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1
include/sound/hdaudio.h
View File

@ -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);

22
sound/hda/hdac_stream.c
View File

@ -820,6 +820,28 @@ 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