diff options
| author | Christoph Hellwig <hch@lst.de> | 2021-06-16 15:46:53 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-06-16 08:52:38 -0600 |
| commit | ea8b16303f2b42d8ea15c7d762e546e4bc793b1f (patch) | |
| tree | 75c6cf973c84ea3110c74473971914dfe1413ab5 /drivers | |
| parent | 827b3e84fd1d2c43b7c85786d366bc53b02cd8da (diff) | |
| download | linux-ea8b16303f2b42d8ea15c7d762e546e4bc793b1f.tar.gz | |
pata_cypress: add a module option to disable BM-DMA
Multiple users report that they need to disable DMA on this driver, so provide an option to do so without affecting all of libata. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Link: https://lore.kernel.org/r/20210616134658.1471835-2-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/ata/pata_cypress.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/ata/pata_cypress.c b/drivers/ata/pata_cypress.c index e1486fe298ae..5b3a7a8ebef6 100644 --- a/drivers/ata/pata_cypress.c +++ b/drivers/ata/pata_cypress.c @@ -41,6 +41,10 @@ enum { CY82_INDEX_TIMEOUT = 0x32 }; +static bool enable_dma = true; +module_param(enable_dma, bool, 0); +MODULE_PARM_DESC(enable_dma, "Enable bus master DMA operations"); + /** * cy82c693_set_piomode - set initial PIO mode data * @ap: ATA interface @@ -124,14 +128,16 @@ static struct ata_port_operations cy82c693_port_ops = { static int cy82c693_init_one(struct pci_dev *pdev, const struct pci_device_id *id) { - static const struct ata_port_info info = { + static struct ata_port_info info = { .flags = ATA_FLAG_SLAVE_POSS, .pio_mask = ATA_PIO4, - .mwdma_mask = ATA_MWDMA2, .port_ops = &cy82c693_port_ops }; const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info }; + if (enable_dma) + info.mwdma_mask = ATA_MWDMA2; + /* Devfn 1 is the ATA primary. The secondary is magic and on devfn2. For the moment we don't handle the secondary. FIXME */ |