Commit 498222f3 authored by Alan Cox's avatar Alan Cox Committed by Jeff Garzik

pata_ali: Lots of problems still showing up with small ATAPI DMA

Hopefully there is a better long term solution but for now lets favour
reliability.
Signed-off-by: default avatarAlan Cox <alan@redhat.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 8f59a13a
......@@ -285,6 +285,21 @@ static void ali_lock_sectors(struct ata_device *adev)
adev->max_sectors = 255;
}
/**
* ali_check_atapi_dma - DMA check for most ALi controllers
* @adev: Device
*
* Called to decide whether commands should be sent by DMA or PIO
*/
static int ali_check_atapi_dma(struct ata_queued_cmd *qc)
{
/* If its not a media command, its not worth it */
if (qc->nbytes < 2048)
return -EOPNOTSUPP;
return 0;
}
static struct scsi_host_template ali_sht = {
.module = THIS_MODULE,
.name = DRV_NAME,
......@@ -381,6 +396,7 @@ static struct ata_port_operations ali_c2_port_ops = {
.mode_filter = ata_pci_default_filter,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.check_atapi_dma = ali_check_atapi_dma,
.check_status = ata_check_status,
.exec_command = ata_exec_command,
.dev_select = ata_std_dev_select,
......@@ -418,6 +434,7 @@ static struct ata_port_operations ali_c5_port_ops = {
.mode_filter = ata_pci_default_filter,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.check_atapi_dma = ali_check_atapi_dma,
.check_status = ata_check_status,
.exec_command = ata_exec_command,
.dev_select = ata_std_dev_select,
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment