diff options
-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 @@ | |||
39 | #include <asm/io.h> | 39 | #include <asm/io.h> |
40 | 40 | ||
41 | /* | 41 | /* |
42 | * Allow UDMA on M1543C-E chipset for WDC disks that ignore CRC checking | ||
43 | * (this is DANGEROUS and could result in data corruption). | ||
44 | */ | ||
45 | static int wdc_udma; | ||
46 | |||
47 | module_param(wdc_udma, bool, 0); | ||
48 | MODULE_PARM_DESC(wdc_udma, | ||
49 | "allow UDMA on M1543C-E chipset for WDC disks (DANGEROUS)"); | ||
50 | |||
51 | /* | ||
42 | * ALi devices are not plug in. Otherwise these static values would | 52 | * ALi devices are not plug in. Otherwise these static values would |
43 | * need to go. They ought to go away anyway | 53 | * need to go. They ought to go away anyway |
44 | */ | 54 | */ |
@@ -116,7 +126,7 @@ static void ali_set_pio_mode(ide_drive_t *drive, const u8 pio) | |||
116 | * The actual rules for the ALi are: | 126 | * The actual rules for the ALi are: |
117 | * No UDMA on revisions <= 0x20 | 127 | * No UDMA on revisions <= 0x20 |
118 | * Disk only for revisions < 0xC2 | 128 | * Disk only for revisions < 0xC2 |
119 | * Not WDC drives for revisions < 0xC2 | 129 | * Not WDC drives on M1543C-E (?) |
120 | * | 130 | * |
121 | * FIXME: WDC ifdef needs to die | 131 | * FIXME: WDC ifdef needs to die |
122 | */ | 132 | */ |
@@ -127,7 +137,8 @@ static u8 ali_udma_filter(ide_drive_t *drive) | |||
127 | if (drive->media != ide_disk) | 137 | if (drive->media != ide_disk) |
128 | return 0; | 138 | return 0; |
129 | #ifndef CONFIG_WDC_ALI15X3 | 139 | #ifndef CONFIG_WDC_ALI15X3 |
130 | if (chip_is_1543c_e && strstr(drive->id->model, "WDC ")) | 140 | if (chip_is_1543c_e && strstr(drive->id->model, "WDC ") && |
141 | wdc_udma == 0) | ||
131 | return 0; | 142 | return 0; |
132 | #endif | 143 | #endif |
133 | } | 144 | } |