Commit ea8b1630 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

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: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarRussell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://lore.kernel.org/r/20210616134658.1471835-2-hch@lst.de


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 827b3e84

drivers/ata/pata_cypress.c

+8 −2
Original line number Diff line number Diff line
@@ -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 */