Sergei Shtylyov wrote:
>
> Fix a number of issues with the DMA support code:
>
> - driver claims support for all SW/MW DMA modes while supporting only MWDMA2;
>
> - ide_dma_check() method tries to enable DMA on the "known good" drives which
> don't support MWDMA2;
>
> - ide_dma_on() method upon failure to set drive to MWDMA2 re-tunes already
> tuned PIO mode and calls ide_dma_off() method instead of returning error;
>
> - ide_dma_off() method sets drive->current_speed while it doesn't actually
> change (only the PIO timings are re-loaded into the chip's registers);
>
> - init_hwif() method forcibly sets/resets both "drive DMA capable" bits while
> this is properly handled by ide_dma_{on,off}() methods being called later...
>
> Signed-off-by: Sergei Shtylyov <sshtylyov@xxxxxxxxxxxxx>
applied
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