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| author | Cezary Rojewski <cezary.rojewski@intel.com> | 2022-10-27 14:46:56 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2022-10-28 13:04:33 +0100 |
| commit | efffb014478e76c35b1a9e279d7010f70ff517e2 (patch) | |
| tree | 773a4ca8a86e594191a3d4b40e1a79745b08d747 /sound/hda | |
| parent | 2b9a50ea845ebe95473f5b85dfcc9b806c252fac (diff) | |
| download | linux-efffb014478e76c35b1a9e279d7010f70ff517e2.tar.gz | |
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: 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>
Diffstat (limited to 'sound/hda')
| -rw-r--r-- | sound/hda/hdac_stream.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/sound/hda/hdac_stream.c b/sound/hda/hdac_stream.c index 35fe2bd582ac..3b250ee7f6a7 100644 --- a/sound/hda/hdac_stream.c +++ b/sound/hda/hdac_stream.c @@ -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 |