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>

diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h
index 78f1809..a687253 100644 (file)
--- a/include/sound/hdaudio.h
+++ b/include/sound/hdaudio.h
@@ -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);

diff --git a/sound/hda/hdac_stream.c b/sound/hda/hdac_stream.c
index 35fe2bd..3b250ee 100644 (file)
--- 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