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Kernel: Allow setting AC'97 sample rate during playback

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The Qemu AC'97 device stops its PCM channel's DMA engine when it is
running and the sample rate is changed. We now make sure the DMA engine
is restarted after changing the sample rate, allowing you to e.g. run
`asctl set r 22050` during `aplay` playback.
This commit is contained in:
Jelle Raaijmakers 2022-02-26 19:20:07 +01:00 • committed by Andreas Kling
parent e2891e9aa4
commit 8bf0e04c16
1 changed files with 4 additions and 0 deletions
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4
Kernel/Devices/Audio/AC97.cpp
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@ -145,6 +145,10 @@ ErrorOr<void> AC97::set_pcm_output_sample_rate(u32 sample_rate)
dbgln("AC97 @ {}: PCM front DAC rate set to {} Hz", pci_address(), m_sample_rate);
// Setting the sample rate stops a running DMA engine, so restart it
if (m_pcm_out_channel.dma_running())
m_pcm_out_channel.start_dma();
return {};
}