From 02d1d6160ffe13f4ebc6f85f72366a5da0b1fb9b Mon Sep 17 00:00:00 2001 From: Bart Hartgers Date: Sun, 17 Jan 2010 00:56:54 +0100 Subject: 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 Acked-by: Tejun Heo Signed-off-by: Jeff Garzik --- drivers/ata/sata_via.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'drivers/ata/sata_via.c') 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 #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[] = { -- cgit v1.2.3 From a55ab496ea9c820b7192c15ef1fbf3291edfe638 Mon Sep 17 00:00:00 2001 From: Bart Hartgers Date: Sun, 14 Feb 2010 13:04:50 +0100 Subject: sata_via: Delay on vt6420 when starting ATAPI DMA write When writing a disc on certain lite-on dvd-writers (also rebadged as optiarc/LG/...) connected to a vt6420, the ATAPI CDB ends up in the datastream and on the disc, causing silent corruption. Delaying between sending the CDB and starting DMA seems to prevent this. I do not know if there are burners that do not suffer from this, but the patch should be safe for those as well. There are many reports of this issue, but AFAICT no solution was found before. For example: http://lkml.indiana.edu/hypermail/linux/kernel/0802.3/0561.html Signed-off-by: Bart Hartgers Signed-off-by: Jeff Garzik --- drivers/ata/sata_via.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) (limited to 'drivers/ata/sata_via.c') diff --git a/drivers/ata/sata_via.c b/drivers/ata/sata_via.c index 2a17fa375164..08f65492cc81 100644 --- a/drivers/ata/sata_via.c +++ b/drivers/ata/sata_via.c @@ -40,11 +40,13 @@ #include #include #include +#include +#include #include #include #define DRV_NAME "sata_via" -#define DRV_VERSION "2.5" +#define DRV_VERSION "2.6" /* * vt8251 is different from other sata controllers of VIA. It has two @@ -80,6 +82,7 @@ static int vt8251_scr_write(struct ata_link *link, unsigned int scr, u32 val); static void svia_tf_load(struct ata_port *ap, const struct ata_taskfile *tf); static void svia_noop_freeze(struct ata_port *ap); static int vt6420_prereset(struct ata_link *link, unsigned long deadline); +static void vt6420_bmdma_start(struct ata_queued_cmd *qc); static int vt6421_pata_cable_detect(struct ata_port *ap); static void vt6421_set_pio_mode(struct ata_port *ap, struct ata_device *adev); static void vt6421_set_dma_mode(struct ata_port *ap, struct ata_device *adev); @@ -121,6 +124,7 @@ static struct ata_port_operations vt6420_sata_ops = { .inherits = &svia_base_ops, .freeze = svia_noop_freeze, .prereset = vt6420_prereset, + .bmdma_start = vt6420_bmdma_start, }; static struct ata_port_operations vt6421_pata_ops = { @@ -377,6 +381,17 @@ static int vt6420_prereset(struct ata_link *link, unsigned long deadline) return 0; } +static void vt6420_bmdma_start(struct ata_queued_cmd *qc) +{ + struct ata_port *ap = qc->ap; + if ((qc->tf.command == ATA_CMD_PACKET) && + (qc->scsicmd->sc_data_direction == DMA_TO_DEVICE)) { + /* Prevents corruption on some ATAPI burners */ + ata_sff_pause(ap); + } + ata_bmdma_start(qc); +} + static int vt6421_pata_cable_detect(struct ata_port *ap) { struct pci_dev *pdev = to_pci_dev(ap->host->dev); -- cgit v1.2.3