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authorBart Hartgers <bart.hartgers@gmail.com>2010-01-17 00:56:54 +0100
committerJeff Garzik <jgarzik@redhat.com>2010-03-01 14:58:44 -0500
commit02d1d6160ffe13f4ebc6f85f72366a5da0b1fb9b (patch)
tree3798274cf1cd116ef7238a8ca32a853bbca13708 /drivers
parent9ffc5da5e1e57592da9c22d83a98c63afc8d985c (diff)
sata_via: Correctly setup PIO/DMA for pata slave on vt6421.
Before only the timings for master were set. Datasheet can be found here: ftp://ftp.vtbridge.org/Docs/Storage/DS_VT6421A_100_CCPL.PDF Surprisingly, a slave drive works without this patch. According to the datasheet, the controller by default derives the DMA mode from the Set Features command issued to a drive. Not sure about the PIO timings, though. The real problem is that the timings for the master effectively are the ones tuned for the slave. If these support different UDMA-settings, there is trouble, especially when the slave supports a higher UDMA than the master. Anyhow, using the same mechanism for both master and slave seems like a good idea. Signed-off-by: Bart Hartgers <bart.hartgers@gmail.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/ata/sata_via.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/ata/sata_via.c b/drivers/ata/sata_via.c
index 02efd9a83d2..2a17fa37516 100644
--- a/drivers/ata/sata_via.c
+++ b/drivers/ata/sata_via.c
@@ -44,7 +44,7 @@
#include <linux/libata.h>
#define DRV_NAME "sata_via"
-#define DRV_VERSION "2.4"
+#define DRV_VERSION "2.5"
/*
* vt8251 is different from other sata controllers of VIA. It has two
@@ -392,14 +392,16 @@ static void vt6421_set_pio_mode(struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
static const u8 pio_bits[] = { 0xA8, 0x65, 0x65, 0x31, 0x20 };
- pci_write_config_byte(pdev, PATA_PIO_TIMING, pio_bits[adev->pio_mode - XFER_PIO_0]);
+ pci_write_config_byte(pdev, PATA_PIO_TIMING - adev->devno,
+ pio_bits[adev->pio_mode - XFER_PIO_0]);
}
static void vt6421_set_dma_mode(struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
static const u8 udma_bits[] = { 0xEE, 0xE8, 0xE6, 0xE4, 0xE2, 0xE1, 0xE0, 0xE0 };
- pci_write_config_byte(pdev, PATA_UDMA_TIMING, udma_bits[adev->dma_mode - XFER_UDMA_0]);
+ pci_write_config_byte(pdev, PATA_UDMA_TIMING - adev->devno,
+ udma_bits[adev->dma_mode - XFER_UDMA_0]);
}
static const unsigned int svia_bar_sizes[] = {