Commit f8a7fe1a authored Jun 01, 2018 by Rakesh Ughreja Committed by Takashi Iwai Jun 28, 2018

ALSA: hdac: ext: add wait for codec to respond after link reset

As per HDA spec section 4.3 - Codec Discovery, the software shall wait
for atleast 521usec for codec to respond after link reset.
With the multi-link capability each link is turned ON/OFF individually.
Link controller drives reset signal when it is turned ON.

Signed-off-by: Rakesh Ughreja <rakesh.a.ughreja@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

parent e1df9317

sound/hda/ext/hdac_ext_controller.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -271,6 +271,15 @@ int snd_hdac_ext_bus_link_get(struct hdac_bus *bus,
		}

		ret = snd_hdac_ext_bus_link_power_up(link);

		/*
		* wait for 521usec for codec to report status
		* HDA spec section 4.3 - Codec Discovery
		*/
		udelay(521);
		bus->codec_mask = snd_hdac_chip_readw(bus, STATESTS);
		dev_dbg(bus->dev, "codec_mask = 0x%lx\n", bus->codec_mask);
		snd_hdac_chip_writew(bus, STATESTS, bus->codec_mask);
		}

		mutex_unlock(&bus->lock);