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authorChristoph Hellwig <hch@lst.de>2021-06-16 15:46:53 +0200
committerJens Axboe <axboe@kernel.dk>2021-06-16 08:52:38 -0600
commitea8b16303f2b42d8ea15c7d762e546e4bc793b1f (patch)
tree75c6cf973c84ea3110c74473971914dfe1413ab5 /drivers/ata
parent827b3e84fd1d2c43b7c85786d366bc53b02cd8da (diff)
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/ata')
-rw-r--r--drivers/ata/pata_cypress.c10
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 */