[libata] sata_sil: disable DMA engine in sil_freeze()
We must disable the DMA engine before accessing taskfile registers. Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
parent
54c38444fa
commit
2fc37adba0
|
@ -565,6 +565,19 @@ static void sil_freeze(struct ata_port *ap)
|
||||||
tmp |= SIL_MASK_IDE0_INT << ap->port_no;
|
tmp |= SIL_MASK_IDE0_INT << ap->port_no;
|
||||||
writel(tmp, mmio_base + SIL_SYSCFG);
|
writel(tmp, mmio_base + SIL_SYSCFG);
|
||||||
readl(mmio_base + SIL_SYSCFG); /* flush */
|
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)
|
static void sil_thaw(struct ata_port *ap)
|
||||||
|
|
Loading…
Reference in a new issue