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| author | Bart Hartgers <bart.hartgers@gmail.com> | 2010-01-17 00:56:54 +0100 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2010-03-01 14:58:44 -0500 |
| commit | 02d1d6160ffe13f4ebc6f85f72366a5da0b1fb9b (patch) | |
| tree | 3798274cf1cd116ef7238a8ca32a853bbca13708 /drivers/ata/sata_via.c | |
| parent | 9ffc5da5e1e57592da9c22d83a98c63afc8d985c (diff) | |
| download | lwn-02d1d6160ffe13f4ebc6f85f72366a5da0b1fb9b.tar.gz lwn-02d1d6160ffe13f4ebc6f85f72366a5da0b1fb9b.zip | |
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/ata/sata_via.c')
| -rw-r--r-- | drivers/ata/sata_via.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/ata/sata_via.c b/drivers/ata/sata_via.c index 02efd9a83d26..2a17fa375164 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[] = { |