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authorRakesh Ughreja <rakesh.a.ughreja@intel.com>2018-06-01 22:54:00 -0500
committerTakashi Iwai <tiwai@suse.de>2018-06-28 07:33:29 +0200
commitf8a7fe1aea215e25eaf3bf04dff66fc7621ec9d7 (patch)
tree3eaa0ae6b3cc8314ae413aeb299b092f4b7a282f /sound/hda
parente1df9317cbb192582ed7aa88c5f294c2336a3c75 (diff)
downloadlinux-f8a7fe1aea215e25eaf3bf04dff66fc7621ec9d7.tar.bz2
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>
Diffstat (limited to 'sound/hda')
-rw-r--r--sound/hda/ext/hdac_ext_controller.c9
1 files changed, 9 insertions, 0 deletions
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);