[Intel-gfx] [PATCH topic/core-for-CI] ALSA: hda/i915 - skip acomp init if no matching display

[Lucas De Marchi]

From: Kai Vehmanen <kai.vehmanen at linux.intel.com>

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 at linux.intel.com>
Acked-by: Lucas De Marchi <lucas.demarchi at intel.com>
Link: https://lore.kernel.org/r/20220405123622.2874457-1-kai.vehmanen@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai at suse.de>
(cherry picked from commit c9db8a30d9f091aa571b5fb7c3f434cde107b02c)
[ applied on sound/for-linus - cherry-pick it in topic/core-for-CI to
  unblock some CI tests ]
Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
 sound/hda/hdac_i915.c | 29 +++++++++++++++++++----------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/sound/hda/hdac_i915.c b/sound/hda/hdac_i915.c
index c42790863805..1ce2cea137db 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;
 }
 
 static bool dg1_gfx_present(void)
@@ -165,7 +174,7 @@ 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;
 
 	if (dg1_gfx_present())
-- 
2.35.1