ALSA: hda/hdmi: Disable silent stream on GLK

The silent stream stuff recurses back into i915 audio
component .get_power() from the .pin_eld_notify() hook.
On GLK this will deadlock as i915 may already be holding
the relevant modeset locks during .pin_eld_notify() and
the GLK audio vs. CDCLK workaround will try to grab the
same locks from .get_power().

Until someone comes up with a better fix just disable the
silent stream support on GLK.

Cc: stable@vger.kernel.org
Cc: Harsha Priya <harshapriya.n@intel.com>
Cc: Emmanuel Jillela <emmanuel.jillela@intel.com>
Cc: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Cc: Takashi Iwai <tiwai@suse.de>
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2623
Fixes: 951894cf30f4 ("ALSA: hda/hdmi: Add Intel silent stream support")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20211222145350.24342-1-ville.syrjala@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index 33e5f1a..4ac2a28 100644 (file)
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -2947,7 +2947,8 @@ static int parse_intel_hdmi(struct hda_codec *codec)
 
 /* Intel Haswell and onwards; audio component with eld notifier */
 static int intel_hsw_common_init(struct hda_codec *codec, hda_nid_t vendor_nid,
-                                const int *port_map, int port_num, int dev_num)
+                                const int *port_map, int port_num, int dev_num,
+                                bool send_silent_stream)
 {
        struct hdmi_spec *spec;
        int err;
@@ -2980,7 +2981,7 @@ static int intel_hsw_common_init(struct hda_codec *codec, hda_nid_t vendor_nid,
         * Enable silent stream feature, if it is enabled via
         * module param or Kconfig option
         */
-       if (enable_silent_stream)
+       if (send_silent_stream)
                spec->send_silent_stream = true;
 
        return parse_intel_hdmi(codec);
@@ -2988,12 +2989,18 @@ static int intel_hsw_common_init(struct hda_codec *codec, hda_nid_t vendor_nid,
 
 static int patch_i915_hsw_hdmi(struct hda_codec *codec)
 {
-       return intel_hsw_common_init(codec, 0x08, NULL, 0, 3);
+       return intel_hsw_common_init(codec, 0x08, NULL, 0, 3,
+                                    enable_silent_stream);
 }
 
 static int patch_i915_glk_hdmi(struct hda_codec *codec)
 {
-       return intel_hsw_common_init(codec, 0x0b, NULL, 0, 3);
+       /*
+        * Silent stream calls audio component .get_power() from
+        * .pin_eld_notify(). On GLK this will deadlock in i915 due
+        * to the audio vs. CDCLK workaround.
+        */
+       return intel_hsw_common_init(codec, 0x0b, NULL, 0, 3, false);
 }
 
 static int patch_i915_icl_hdmi(struct hda_codec *codec)
@@ -3004,7 +3011,8 @@ static int patch_i915_icl_hdmi(struct hda_codec *codec)
         */
        static const int map[] = {0x0, 0x4, 0x6, 0x8, 0xa, 0xb};
 
-       return intel_hsw_common_init(codec, 0x02, map, ARRAY_SIZE(map), 3);
+       return intel_hsw_common_init(codec, 0x02, map, ARRAY_SIZE(map), 3,
+                                    enable_silent_stream);
 }
 
 static int patch_i915_tgl_hdmi(struct hda_codec *codec)
@@ -3016,7 +3024,8 @@ static int patch_i915_tgl_hdmi(struct hda_codec *codec)
        static const int map[] = {0x4, 0x6, 0x8, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf};
        int ret;
 
-       ret = intel_hsw_common_init(codec, 0x02, map, ARRAY_SIZE(map), 4);
+       ret = intel_hsw_common_init(codec, 0x02, map, ARRAY_SIZE(map), 4,
+                                   enable_silent_stream);
        if (!ret) {
                struct hdmi_spec *spec = codec->spec;