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>
diff --git a/drivers/ide/pci/cs5535.c b/drivers/ide/pci/cs5535.c
index 9bd526d..082ca7d 100644
--- a/drivers/ide/pci/cs5535.c
+++ b/drivers/ide/pci/cs5535.c
@@ -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 @@
/* 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 @@
*
* 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;
}