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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: 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>
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@ -597,6 +597,7 @@ int snd_hdac_stream_get_spbmaxfifo(struct hdac_bus *bus,
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struct hdac_stream *azx_dev);
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void snd_hdac_stream_drsm_enable(struct hdac_bus *bus,
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bool enable, int index);
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int snd_hdac_stream_wait_drsm(struct hdac_stream *azx_dev);
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int snd_hdac_stream_set_dpibr(struct hdac_bus *bus,
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struct hdac_stream *azx_dev, u32 value);
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int snd_hdac_stream_set_lpib(struct hdac_stream *azx_dev, u32 value);
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@ -821,6 +821,28 @@ void snd_hdac_stream_drsm_enable(struct hdac_bus *bus,
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}
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EXPORT_SYMBOL_GPL(snd_hdac_stream_drsm_enable);
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/*
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* snd_hdac_stream_wait_drsm - wait for HW to clear RSM for a stream
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* @azx_dev: HD-audio core stream to await RSM for
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*
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* Returns 0 on success and -ETIMEDOUT upon a timeout.
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*/
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int snd_hdac_stream_wait_drsm(struct hdac_stream *azx_dev)
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{
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struct hdac_bus *bus = azx_dev->bus;
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u32 mask, reg;
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int ret;
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mask = 1 << azx_dev->index;
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ret = read_poll_timeout(snd_hdac_reg_readl, reg, !(reg & mask), 250, 2000, false, bus,
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bus->drsmcap + AZX_REG_DRSM_CTL);
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if (ret)
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dev_dbg(bus->dev, "polling RSM 0x%08x failed: %d\n", mask, ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_stream_wait_drsm);
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/**
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* snd_hdac_stream_set_dpibr - sets the dpibr value of a stream
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* @bus: HD-audio core bus
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