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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>
This commit is contained in:
Christoph Hellwig 2021-06-16 15:46:53 +02:00 committed by Jens Axboe
parent 827b3e84fd
commit ea8b16303f
1 changed files with 8 additions and 2 deletions
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10
drivers/ata/pata_cypress.c
View File

@ -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 */