ALSA: intel8x0: Skip ac97 clock measurement on VM

The intel8x0 driver tries to measure the AC97 bus clock at the probe
time because there have been machines that are driven in different
rate (44.1kHz vs 48kHz).  This was the past and currently most of
usages of this driver are on VM, and those are certainly fixed with
48k clock, hence it's useless and waste of time to measure.

This patch is an optimization, setting the fixed 48k rate if it's
detected to be running on a VM.

Link: https://lore.kernel.org/r/20210712093641.29079-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/intel8x0.c b/sound/pci/intel8x0.c
index df3ba5c70de9ad6fdd860c589f3d5b8df795d3c2..6a436a2ce26a15d450fb5a4ab37bdb1fc2e1792a 100644 (file)
--- a/sound/pci/intel8x0.c
+++ b/sound/pci/intel8x0.c
@@ -2656,6 +2656,8 @@ static void intel8x0_measure_ac97_clock(struct intel8x0 *chip)
 
        if (chip->ac97_bus->clock != 48000)
                return; /* specified in module option */
+       if (chip->inside_vm && !ac97_clock)
+               return; /* no measurement on VM */
 
       __again:
        subs = chip->pcm[0]->streams[0].substream;