Tejun Heo wrote:
and thus clear DRQ, right? Stuck DRQ after SRST seems odd to me.
Unfortunately not odd on ata_piix, which can get stuck DRQ-on somewhere deep inside its IDE emulation engine. And neither draining the FIFO nor SRST nor a couple other tricks ever helped. The only thing that seemed to make any difference was an enable/disable reset via our beloved PCS register.
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