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cs5535: PIO fixes 

* Fix cs5535_tuneproc() to pass PIO transfer mode value instead of PIO mode
  number to cs5535_set_speed() (fixes random PIO timings being programmed
  and a possible OOPS).  Do a little cleanup while at it.

* Fix cs5535_set_speed() to check if the mate device is present (fixes PIO0
  taskfile timings being used if there is no other device on the cable).

* Use cs5535_tuneproc() in cs5535_dma_check().  The old code had the same
  issue as cs5535_tuneproc() and add additionally caused 0x00-0x04 transfer
  mode values (== default PIO, default PIO w/ IORDY + two invalid values)
  being set on the device instead of values 0x08-0x0c (XFER_PIO_[0,4]).

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2007-08-01 23:46:45 +02:00
parent 070224339b
commit bc0b0b5c4b
1 changed files with 17 additions and 23 deletions
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40
drivers/ide/pci/cs5535.c
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@ -2,6 +2,7 @@
* linux/drivers/ide/pci/cs5535.c
*
* Copyright (C) 2004-2005 Advanced Micro Devices, Inc.
* Copyright (C) 2007 Bartlomiej Zolnierkiewicz
*
* History:
* 09/20/2005 - Jaya Kumar <jayakumar.ide@gmail.com>
@ -83,14 +84,17 @@ static void cs5535_set_speed(ide_drive_t *drive, u8 speed)
/* Set the PIO timings */
if ((speed & XFER_MODE) == XFER_PIO) {
u8 pioa;
u8 piob;
u8 cmd;
ide_drive_t *pair = &drive->hwif->drives[drive->dn ^ 1];
u8 cmd, pioa;
pioa = speed - XFER_PIO_0;
piob = ide_get_best_pio_mode(&(drive->hwif->drives[!unit]),
255, 4);
cmd = pioa < piob ? pioa : piob;
cmd = pioa = speed - XFER_PIO_0;
if (pair->present) {
u8 piob = ide_get_best_pio_mode(pair, 255, 4);
if (piob < cmd)
cmd = piob;
}
/* Write the speed of the current drive */
reg = (cs5535_pio_cmd_timings[cmd] << 16) |
@ -151,32 +155,22 @@ static int cs5535_set_drive(ide_drive_t *drive, u8 speed)
*
* A callback from the upper layers for PIO-only tuning.
*/
static void cs5535_tuneproc(ide_drive_t *drive, u8 xferspeed)
static void cs5535_tuneproc(ide_drive_t *drive, u8 pio)
{
u8 modes[] = { XFER_PIO_0, XFER_PIO_1, XFER_PIO_2, XFER_PIO_3,
XFER_PIO_4 };
/* cs5535 max pio is pio 4, best_pio will check the blacklist.
i think we don't need to rate_filter the incoming xferspeed
since we know we're only going to choose pio */
xferspeed = ide_get_best_pio_mode(drive, xferspeed, 4);
ide_config_drive_speed(drive, modes[xferspeed]);
cs5535_set_speed(drive, xferspeed);
pio = ide_get_best_pio_mode(drive, pio, 4);
ide_config_drive_speed(drive, XFER_PIO_0 + pio);
cs5535_set_speed(drive, XFER_PIO_0 + pio);
}
static int cs5535_dma_check(ide_drive_t *drive)
{
u8 speed;
drive->init_speed = 0;
if (ide_tune_dma(drive))
return 0;
if (ide_use_fast_pio(drive)) {
speed = ide_get_best_pio_mode(drive, 255, 4);
cs5535_set_drive(drive, speed);
}
if (ide_use_fast_pio(drive))
cs5535_tuneproc(drive, 255);
return -1;
}