From f8a7fe1aea215e25eaf3bf04dff66fc7621ec9d7 Mon Sep 17 00:00:00 2001 From: Rakesh Ughreja Date: Fri, 1 Jun 2018 22:54:00 -0500 Subject: 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 Signed-off-by: Pierre-Louis Bossart Signed-off-by: Takashi Iwai --- sound/hda/ext/hdac_ext_controller.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'sound/hda/ext') diff --git a/sound/hda/ext/hdac_ext_controller.c b/sound/hda/ext/hdac_ext_controller.c index 72774119dd11..5bc4a1d587d4 100644 --- a/sound/hda/ext/hdac_ext_controller.c +++ b/sound/hda/ext/hdac_ext_controller.c @@ -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); -- cgit v1.2.3