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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2007-11-19 14:37:58 +0000
committerJeff Garzik <jeff@garzik.org>2007-11-23 19:33:27 -0500
commit498222f323ab11331dc5cfedb97752477f0fe42a (patch)
tree3d6c2b59c807e06976cdbf9bafb9a8e489d0610f /drivers/ata
parent8f59a13accd78e9759548b40aa2a053938a01ec7 (diff)
downloadop-kernel-dev-498222f323ab11331dc5cfedb97752477f0fe42a.zip
op-kernel-dev-498222f323ab11331dc5cfedb97752477f0fe42a.tar.gz
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: Alan Cox <alan@redhat.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/pata_ali.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/ata/pata_ali.c b/drivers/ata/pata_ali.c
index d12f386..62aa2f9 100644
--- a/drivers/ata/pata_ali.c
+++ b/drivers/ata/pata_ali.c
@@ -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,
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