[Bug 1940] ibook doesn't "wake up"

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http://bugzilla.ubuntu.com/show_bug.cgi?id=1940
Ubuntu | linux





------- Additional Comments From daniel at gimpelevich.san-francisco.ca.us  2005-07-28 21:56 UTC -------
This is in ide-cd.c:
3275         case ide_pm_state_start_resume: /* Resume step 1 (restore DMA) */
3276                 /*
3277                  * Right now, all we do is call hwif->ide_dma_check(drive),
3278                  * we could be smarter and check for current xfer_speed
3279                  * in struct drive etc...
3280                  * Also, this step could be implemented as a generic helper
3281                  * as most subdrivers will use it.
3282                  */
3283                 if ((drive->id->capability & 1) == 0)
3284                         break;
3285                 if (HWIF(drive)->ide_dma_check == NULL)
3286                         break;
3287                 HWIF(drive)->ide_dma_check(drive);
3288                 break;
This is in ide-dma.c:
524 /**
525  *      __ide_dma_check         -       check DMA setup
526  *      @drive: drive to check
527  *
528  *      Don't use - due for extermination
529  */
530  
531 int __ide_dma_check (ide_drive_t *drive)
532 {
533         return config_drive_for_dma(drive);
534 }
Earlier in the same file:
339 /**
340  *      config_drive_for_dma    -       attempt to activate IDE DMA
341  *      @drive: the drive to place in DMA mode
342  *
343  *      If the drive supports at least mode 2 DMA or UDMA of any kind
344  *      then attempt to place it into DMA mode. Drives that are known to
345  *      support DMA but predate the DMA properties or that are known
346  *      to have DMA handling bugs are also set up appropriately based
347  *      on the good/bad drive lists.
348  */
349  
350 static int config_drive_for_dma (ide_drive_t *drive)
351 {
352         struct hd_driveid *id = drive->id;
353         ide_hwif_t *hwif = HWIF(drive);
354 
355         if ((id->capability & 1) && hwif->autodma) {
356                 /*
357                  * Enable DMA on any drive that has
358                  * UltraDMA (mode 0/1/2/3/4/5/6) enabled
359                  */
360                 if ((id->field_valid & 4) && ((id->dma_ultra >> 8) & 0x7f))
361                         return hwif->ide_dma_on(drive);
362                 /*
363                  * Enable DMA on any drive that has mode2 DMA
364                  * (multi or single) enabled
365                  */
366                 if (id->field_valid & 2)        /* regular DMA */
367                         if ((id->dma_mword & 0x404) == 0x404 ||
368                             (id->dma_1word & 0x404) == 0x404)
369                                 return hwif->ide_dma_on(drive);
370 
371                 /* Consult the list of known "good" drives */
372                 if (__ide_dma_good_drive(drive))
373                         return hwif->ide_dma_on(drive);
374         }
375 //      if (hwif->tuneproc != NULL) hwif->tuneproc(drive, 255);
376         return hwif->ide_dma_off_quietly(drive);
377 }



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