• Sergei Shtylyov's avatar
    sl82c105: DMA support fixes · ea266ba1
    Sergei Shtylyov authored
    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: default avatarSergei Shtylyov <sshtylyov@ru.mvista.com>
    Signed-off-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
sl82c105.c 12 KB