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authorSergei Shtylyov <sshtylyov@ru.mvista.com>2009-03-31 20:15:27 +0200
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2009-03-31 20:15:27 +0200
commit8d64fcd9357798ad0d61f8877de13d5e1b1ab510 (patch)
tree7e0737ef385b80faf9fa3f5d0c1df1f22254d0d8 /drivers/ide/ide-dma.c
parent985232e388714d4a9e94b4d96ee69b6ff8c9dc31 (diff)
ide: identify data word 53 bit 1 doesn't cover words 62 and 63 (take 3)
The IDE code assumed for years that the bit 1 of the identify data word 53 also covers the validity of the SW/MW DMA information in words 62 and 63, but it has always covered only words 64 thru 70, with words 62 and 63 being defined in the original ATA spec, not in ATA-2... This fix however should only concern *very* old hard disks and rather old CF cards... Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide/ide-dma.c')
-rw-r--r--drivers/ide/ide-dma.c32
1 files changed, 14 insertions, 18 deletions
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index a5612eadc30..f9c91752f27 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -245,12 +245,11 @@ static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base, u8 req_mode)
case XFER_UDMA_0:
if ((id[ATA_ID_FIELD_VALID] & 4) == 0)
break;
-
+ mask = id[ATA_ID_UDMA_MODES];
if (port_ops && port_ops->udma_filter)
- mask = port_ops->udma_filter(drive);
+ mask &= port_ops->udma_filter(drive);
else
- mask = hwif->ultra_mask;
- mask &= id[ATA_ID_UDMA_MODES];
+ mask &= hwif->ultra_mask;
/*
* avoid false cable warning from eighty_ninty_three()
@@ -261,18 +260,15 @@ static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base, u8 req_mode)
}
break;
case XFER_MW_DMA_0:
- if ((id[ATA_ID_FIELD_VALID] & 2) == 0)
- break;
+ mask = id[ATA_ID_MWDMA_MODES];
if (port_ops && port_ops->mdma_filter)
- mask = port_ops->mdma_filter(drive);
+ mask &= port_ops->mdma_filter(drive);
else
- mask = hwif->mwdma_mask;
- mask &= id[ATA_ID_MWDMA_MODES];
+ mask &= hwif->mwdma_mask;
break;
case XFER_SW_DMA_0:
- if (id[ATA_ID_FIELD_VALID] & 2) {
- mask = id[ATA_ID_SWDMA_MODES] & hwif->swdma_mask;
- } else if (id[ATA_ID_OLD_DMA_MODES] >> 8) {
+ mask = id[ATA_ID_SWDMA_MODES];
+ if (!(mask & ATA_SWDMA2) && (id[ATA_ID_OLD_DMA_MODES] >> 8)) {
u8 mode = id[ATA_ID_OLD_DMA_MODES] >> 8;
/*
@@ -280,8 +276,9 @@ static unsigned int ide_get_mode_mask(ide_drive_t *drive, u8 base, u8 req_mode)
* (the maximum allowed mode is XFER_SW_DMA_2)
*/
if (mode <= 2)
- mask = ((2 << mode) - 1) & hwif->swdma_mask;
+ mask = (2 << mode) - 1;
}
+ mask &= hwif->swdma_mask;
break;
default:
BUG();
@@ -398,11 +395,10 @@ int ide_id_dma_bug(ide_drive_t *drive)
if ((id[ATA_ID_UDMA_MODES] >> 8) &&
(id[ATA_ID_MWDMA_MODES] >> 8))
goto err_out;
- } else if (id[ATA_ID_FIELD_VALID] & 2) {
- if ((id[ATA_ID_MWDMA_MODES] >> 8) &&
- (id[ATA_ID_SWDMA_MODES] >> 8))
- goto err_out;
- }
+ } else if ((id[ATA_ID_MWDMA_MODES] >> 8) &&
+ (id[ATA_ID_SWDMA_MODES] >> 8))
+ goto err_out;
+
return 0;
err_out:
printk(KERN_ERR "%s: bad DMA info in identify block\n", drive->name);