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ide: ide_find_best_pio_mode() fixes (take 2) 

* Check IORDY bit for PIO modes > 2.

* Some devices claim maximum PIO mode > 2 in id->tPIO, they were punished too
  severly for this by being limited to PIO_SLOW.  Limit them to PIO2 instead.

v2:
* Fix PIO number being returned incorrectly instead of PIO mode
  (Noticed by Sergei).

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2007-07-20 01:11:57 +02:00
parent 7dd00083b1
commit e5fa4b2968
1 changed files with 4 additions and 6 deletions
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8
drivers/ide/ide-timing.h
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@ -111,16 +111,14 @@ static short ide_find_best_pio_mode(ide_drive_t *drive)
struct hd_driveid *id = drive->id;
short best = 0;
if (id->field_valid & 2) { /* EIDE PIO modes */
/* EIDE PIO modes */
if ((id->field_valid & 2) && (id->capability & 8)) {
if ((best = (drive->id->eide_pio_modes & 4) ? XFER_PIO_5 :
(drive->id->eide_pio_modes & 2) ? XFER_PIO_4 :
(drive->id->eide_pio_modes & 1) ? XFER_PIO_3 : 0)) return best;
}
return (drive->id->tPIO == 2) ? XFER_PIO_2 :
(drive->id->tPIO == 1) ? XFER_PIO_1 :
(drive->id->tPIO == 0) ? XFER_PIO_0 : XFER_PIO_SLOW;
return XFER_PIO_0 + min_t(u8, id->tPIO, 2);
}
static void ide_timing_quantize(struct ide_timing *t, struct ide_timing *q, int T, int UT)