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the AC97_POWER_ANL bit. The heuristic simply checks if AC97_REG_POWER's AC97_POWER_MIXER bit can be set, implying the CODEC can control power to its mixer. If the bit reads back as zero after we set it, assume ANL is reserved. Without this patch, some CODECs (e.g. Philips UCB1400) will experience long delays during attach and resume while the driver waits for a bit which will never set. Thanks to jmcneill@ for reviewing this WRT AC97 modem power control. |
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