[PATCH] drm/i915: Fix audio component initialization

[Imre Deak]

After registering the audio component in i915_audio_component_init()
the audio driver may call i915_audio_component_get_power() via the
component ops. This could program AUD_FREQ_CNTRL with an uninitialized
value if the latter function is called before display.audio.freq_cntrl
gets initialized. The get_power() function also does a modeset which in
the above case happens too early before the initialization step and
triggers the

"Reject display access from task"

error message added by the Fixes: commit below.

Fix the above issue by registering the audio component only after the
initialization step.

Fixes: bd738d859e71 ("drm/i915: Prevent modesets during driver init/shutdown")
Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/10291
Signed-off-by: Imre Deak <imre.d...@intel.com>
---
 drivers/gpu/drm/i915/display/intel_audio.c    | 32 ++++++++++++-------
 drivers/gpu/drm/i915/display/intel_audio.h    |  1 +
 .../drm/i915/display/intel_display_driver.c   |  2 ++
 3 files changed, 24 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_audio.c 
b/drivers/gpu/drm/i915/display/intel_audio.c
index adde87900557f..4c031e97f9a55 100644
--- a/drivers/gpu/drm/i915/display/intel_audio.c
+++ b/drivers/gpu/drm/i915/display/intel_audio.c
@@ -1267,17 +1267,6 @@ static const struct component_ops 
i915_audio_component_bind_ops = {
 static void i915_audio_component_init(struct drm_i915_private *i915)
 {
        u32 aud_freq, aud_freq_init;
-       int ret;
-
-       ret = component_add_typed(i915->drm.dev,
-                                 &i915_audio_component_bind_ops,
-                                 I915_COMPONENT_AUDIO);
-       if (ret < 0) {
-               drm_err(&i915->drm,
-                       "failed to add audio component (%d)\n", ret);
-               /* continue with reduced functionality */
-               return;
-       }
 
        if (DISPLAY_VER(i915) >= 9) {
                aud_freq_init = intel_de_read(i915, AUD_FREQ_CNTRL);
@@ -1300,6 +1289,21 @@ static void i915_audio_component_init(struct 
drm_i915_private *i915)
 
        /* init with current cdclk */
        intel_audio_cdclk_change_post(i915);
+}
+
+static void i915_audio_component_register(struct drm_i915_private *i915)
+{
+       int ret;
+
+       ret = component_add_typed(i915->drm.dev,
+                                 &i915_audio_component_bind_ops,
+                                 I915_COMPONENT_AUDIO);
+       if (ret < 0) {
+               drm_err(&i915->drm,
+                       "failed to add audio component (%d)\n", ret);
+               /* continue with reduced functionality */
+               return;
+       }
 
        i915->display.audio.component_registered = true;
 }
@@ -1332,6 +1336,12 @@ void intel_audio_init(struct drm_i915_private *i915)
                i915_audio_component_init(i915);
 }
 
+void intel_audio_register(struct drm_i915_private *i915)
+{
+       if (!i915->display.audio.lpe.platdev)
+               i915_audio_component_register(i915);
+}
+
 /**
  * intel_audio_deinit() - deinitialize the audio driver
  * @i915: the i915 drm device private data
diff --git a/drivers/gpu/drm/i915/display/intel_audio.h 
b/drivers/gpu/drm/i915/display/intel_audio.h
index 9327954b801e5..576c061d72a45 100644
--- a/drivers/gpu/drm/i915/display/intel_audio.h
+++ b/drivers/gpu/drm/i915/display/intel_audio.h
@@ -28,6 +28,7 @@ void intel_audio_codec_get_config(struct intel_encoder 
*encoder,
 void intel_audio_cdclk_change_pre(struct drm_i915_private *dev_priv);
 void intel_audio_cdclk_change_post(struct drm_i915_private *dev_priv);
 void intel_audio_init(struct drm_i915_private *dev_priv);
+void intel_audio_register(struct drm_i915_private *i915);
 void intel_audio_deinit(struct drm_i915_private *dev_priv);
 void intel_audio_sdp_split_update(const struct intel_crtc_state *crtc_state);
 
diff --git a/drivers/gpu/drm/i915/display/intel_display_driver.c 
b/drivers/gpu/drm/i915/display/intel_display_driver.c
index 89bd032ed995e..794b4af380558 100644
--- a/drivers/gpu/drm/i915/display/intel_display_driver.c
+++ b/drivers/gpu/drm/i915/display/intel_display_driver.c
@@ -540,6 +540,8 @@ void intel_display_driver_register(struct drm_i915_private 
*i915)
 
        intel_display_driver_enable_user_access(i915);
 
+       intel_audio_register(i915);
+
        intel_display_debugfs_register(i915);
 
        /*
-- 
2.43.3