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authorChristian Gmeiner <christian.gmeiner@gmail.com>2012-10-09 19:53:12 +0400
committerJeff Garzik <jgarzik@redhat.com>2012-11-28 21:38:41 +0400
commitabf8f2b877846573f0e6498883fe43f08be5696d (patch)
treef33d941d949395934f40e4c37768c55ecf4ebbe4 /drivers/ata/pata_cs5536.c
parentd9904344fc4052fbe7e4dc137eba0dcdadf326bd (diff)
downloadlinux-abf8f2b877846573f0e6498883fe43f08be5696d.tar.xz
pata_cs5536: add quirk for broken udma
I am working on a device which uses the cs5536 pata driver. There are some broken hardware revisions out in the field, which can be detected via DMI. On older versions with an embedded BIOS I used libata.dma=0 to disable dma completely. Now we are switching to a coreboot/seabios based BIOS where we have DMI support and so I think its a good idea to get rid of all those hacky kernel parameters as the same image is used other devices where libata.dma=0 is not a good idea. Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata/pata_cs5536.c')
-rw-r--r--drivers/ata/pata_cs5536.c32
1 files changed, 31 insertions, 1 deletions
diff --git a/drivers/ata/pata_cs5536.c b/drivers/ata/pata_cs5536.c
index dec1b6c4b351..0448860a2077 100644
--- a/drivers/ata/pata_cs5536.c
+++ b/drivers/ata/pata_cs5536.c
@@ -38,6 +38,7 @@
#include <linux/delay.h>
#include <linux/libata.h>
#include <scsi/scsi_host.h>
+#include <linux/dmi.h>
#ifdef CONFIG_X86_32
#include <asm/msr.h>
@@ -80,6 +81,21 @@ enum {
IDE_ETC_UDMA_MASK = 0xc0,
};
+/* Some Bachmann OT200 devices have a non working UDMA support due a
+ * missing resistor.
+ */
+static const struct dmi_system_id udma_quirk_dmi_table[] = {
+ {
+ .ident = "Bachmann electronic OT200",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Bachmann electronic"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "OT200"),
+ DMI_MATCH(DMI_PRODUCT_VERSION, "1")
+ },
+ },
+ { }
+};
+
static int cs5536_read(struct pci_dev *pdev, int reg, u32 *val)
{
if (unlikely(use_msr)) {
@@ -242,9 +258,23 @@ static int cs5536_init_one(struct pci_dev *dev, const struct pci_device_id *id)
.port_ops = &cs5536_port_ops,
};
- const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
+ static const struct ata_port_info no_udma_info = {
+ .flags = ATA_FLAG_SLAVE_POSS,
+ .pio_mask = ATA_PIO4,
+ .port_ops = &cs5536_port_ops,
+ };
+
+
+ const struct ata_port_info *ppi[2];
u32 cfg;
+ if (dmi_check_system(udma_quirk_dmi_table))
+ ppi[0] = &no_udma_info;
+ else
+ ppi[0] = &info;
+
+ ppi[1] = &ata_dummy_port_info;
+
if (use_msr)
printk(KERN_ERR DRV_NAME ": Using MSR regs instead of PCI\n");