diff options
| author | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2008-05-14 23:06:16 +0200 |
|---|---|---|
| committer | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2008-05-14 23:06:16 +0200 |
| commit | 63b1623ef0e33160d782fd1b0044e9a8af5d16cf (patch) | |
| tree | 064bde66cbf8c2ea9a1df6f23c6db0e3ad6f402a /drivers/ide/pci/alim15x3.c | |
| parent | 2bf111d97a8c05d3fe436caaf18ba0634c9ab33d (diff) | |
| download | lwn-63b1623ef0e33160d782fd1b0044e9a8af5d16cf.tar.gz lwn-63b1623ef0e33160d782fd1b0044e9a8af5d16cf.zip | |
alim15x3: add "wdc_udma" module parameter
Add "wdc_udma" module parameter for allowing UDMA transfers
on M1543C-E chipset for WDC disks.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide/pci/alim15x3.c')
| -rw-r--r-- | drivers/ide/pci/alim15x3.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/ide/pci/alim15x3.c b/drivers/ide/pci/alim15x3.c index 98ecf1451fc7..3eaab542c41a 100644 --- a/drivers/ide/pci/alim15x3.c +++ b/drivers/ide/pci/alim15x3.c @@ -39,6 +39,16 @@ #include <asm/io.h> /* + * Allow UDMA on M1543C-E chipset for WDC disks that ignore CRC checking + * (this is DANGEROUS and could result in data corruption). + */ +static int wdc_udma; + +module_param(wdc_udma, bool, 0); +MODULE_PARM_DESC(wdc_udma, + "allow UDMA on M1543C-E chipset for WDC disks (DANGEROUS)"); + +/* * ALi devices are not plug in. Otherwise these static values would * need to go. They ought to go away anyway */ @@ -116,7 +126,7 @@ static void ali_set_pio_mode(ide_drive_t *drive, const u8 pio) * The actual rules for the ALi are: * No UDMA on revisions <= 0x20 * Disk only for revisions < 0xC2 - * Not WDC drives for revisions < 0xC2 + * Not WDC drives on M1543C-E (?) * * FIXME: WDC ifdef needs to die */ @@ -127,7 +137,8 @@ static u8 ali_udma_filter(ide_drive_t *drive) if (drive->media != ide_disk) return 0; #ifndef CONFIG_WDC_ALI15X3 - if (chip_is_1543c_e && strstr(drive->id->model, "WDC ")) + if (chip_is_1543c_e && strstr(drive->id->model, "WDC ") && + wdc_udma == 0) return 0; #endif } |