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[v2] ALSA: hda/i915 - skip acomp init if no matching display

Message ID 20220405123622.2874457-1-kai.vehmanen@linux.intel.com
State Accepted
Commit c9db8a30d9f091aa571b5fb7c3f434cde107b02c
Headers show
Series [v2] ALSA: hda/i915 - skip acomp init if no matching display | expand

Commit Message

Kai Vehmanen April 5, 2022, 12:36 p.m. UTC 
In systems with only a discrete i915 GPU, the acomp init will
always timeout for the PCH HDA controller instance.

Avoid the timeout by checking the PCI device hierarchy
whether any display class PCI device can be found on the system,
and at the same level as the HDA PCI device. If found, proceed
with the acomp init, which will wait until i915 probe is complete
and component binding can proceed. If no matching display
device is found, the audio component bind can be safely skipped.

The bind timeout will still be hit if the display is present
in the system, but i915 driver does not bind to it by configuration
choice or probe error. In this case the 60sec timeout will be
hit.

Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Acked-by: Lucas De Marchi <lucas.demarchi@intel.com>
---
 sound/hda/hdac_i915.c | 29 +++++++++++++++++++----------
 1 file changed, 19 insertions(+), 10 deletions(-)


base-commit: bfa1e1a62c8bdbe3d8c915fbb7a078dc783b2ee8
diff mbox series

Patch

diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c
index efe810af28c5..48b8ed752b69 100644
--- a/sound/hda/hdac_i915.c
+++ b/sound/hda/hdac_i915.c
@@ -116,16 +116,25 @@  static int i915_component_master_match(struct device *dev, int subcomponent,
 	return 0;
 }
 
-/* check whether intel graphics is present */
-static bool i915_gfx_present(void)
+/* check whether Intel graphics is present and reachable */
+static int i915_gfx_present(struct pci_dev *hdac_pci)
 {
-	static const struct pci_device_id ids[] = {
-		{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_ANY_ID),
-		  .class = PCI_BASE_CLASS_DISPLAY << 16,
-		  .class_mask = 0xff << 16 },
-		{}
-	};
-	return pci_dev_present(ids);
+	unsigned int class = PCI_BASE_CLASS_DISPLAY << 16;
+	struct pci_dev *display_dev = NULL;
+	bool match = false;
+
+	do {
+		display_dev = pci_get_class(class, display_dev);
+
+		if (display_dev && display_dev->vendor == PCI_VENDOR_ID_INTEL &&
+		    connectivity_check(display_dev, hdac_pci))
+			match = true;
+
+		pci_dev_put(display_dev);
+
+	} while (!match && display_dev);
+
+	return match;
 }
 
 /**
@@ -145,7 +154,7 @@  int snd_hdac_i915_init(struct hdac_bus *bus)
 	struct drm_audio_component *acomp;
 	int err;
 
-	if (!i915_gfx_present())
+	if (!i915_gfx_present(to_pci_dev(bus->dev)))
 		return -ENODEV;
 
 	err = snd_hdac_acomp_init(bus, NULL,