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Commit 2fc37adb authored by Jeff Garzik's avatar Jeff Garzik Committed by Jeff Garzik
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[libata] sata_sil: disable DMA engine in sil_freeze() 



We must disable the DMA engine before accessing taskfile registers.

Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
parent 54c38444

drivers/ata/sata_sil.c

+13 −0
Original line number Diff line number Diff line
@@ -565,6 +565,19 @@ static void sil_freeze(struct ata_port *ap) 
	tmp |= SIL_MASK_IDE0_INT << ap->port_no;

	writel(tmp, mmio_base + SIL_SYSCFG);

	readl(mmio_base + SIL_SYSCFG);	/* flush */



	/* Ensure DMA_ENABLE is off.

	 *

	 * This is because the controller will not give us access to the

	 * taskfile registers while a DMA is in progress

	 */

	iowrite8(ioread8(ap->ioaddr.bmdma_addr) & ~SIL_DMA_ENABLE,

		 ap->ioaddr.bmdma_addr);



	/* According to ata_bmdma_stop, an HDMA transition requires

	 * on PIO cycle. But we can't read a taskfile register.

	 */

	ioread8(ap->ioaddr.bmdma_addr);

}



static void sil_thaw(struct ata_port *ap)