intelhdmi - dont power off HDA link

For codecs without EPSS support (G45/IbexPeak), the hotplug event will
be lost if the HDA is powered off during the time. After that the pin
presence detection verb returns inaccurate info.

So always power-on HDA link for !EPSS codecs.

KarL offers the fact and Takashi recommends to flag hda_bus. Thanks!

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

3 files changed, 14 insertions, 1 deletions

diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index 9000d52fccca..1d541b7f5547 100644
--- a/sound/pci/hda/hda_codec.h
+++ b/sound/pci/hda/hda_codec.h
@@ -639,6 +639,7 @@ struct hda_bus {
         unsigned int rirb_error:1;      /* error in codec communication */
         unsigned int response_reset:1;  /* controller was reset */
         unsigned int in_reset:1;        /* during reset operation */
+        unsigned int power_keep_link_on:1; /* don't power off HDA link */
 };
 
 /*
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index efcc4f7c57f2..e54420e691ae 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -2082,7 +2082,8 @@ static void azx_power_notify(struct hda_bus *bus)
         }
         if (power_on)
                 azx_init_chip(chip);
-        else if (chip->running && power_save_controller)
+        else if (chip->running && power_save_controller &&
+                 !bus->power_keep_link_on)
                 azx_stop_chip(chip);
 }
 #endif /* CONFIG_SND_HDA_POWER_SAVE */
diff --git a/sound/pci/hda/patch_intelhdmi.c b/sound/pci/hda/patch_intelhdmi.c
index 3990182777ee..918f40378d52 100644
--- a/sound/pci/hda/patch_intelhdmi.c
+++ b/sound/pci/hda/patch_intelhdmi.c
@@ -391,6 +391,17 @@ static int intel_hdmi_parse_codec(struct hda_codec *codec)
                 }
         }
 
+        /*
+         * G45/IbexPeak don't support EPSS: the unsolicited pin hot plug event
+         * can be lost and presence sense verb will become inaccurate if the
+         * HDA link is powered off at hot plug or hw initialization time.
+         */
+#ifdef CONFIG_SND_HDA_POWER_SAVE
+        if (!(snd_hda_param_read(codec, codec->afg, AC_PAR_POWER_STATE) &
+              AC_PWRST_EPSS))
+                codec->bus->power_keep_link_on = 1;
+#endif
+
         return 0;
 }