The PDC202xx older devices do not support ATAPI DMA via the usual
interfaces. What documentation I have isn't sufficient to support DMA and
it isn't clear if the Windows drivers do this or it is possible at all.
(Neither do the drivers/ide old drivers)
So turn it ATAPI DMA off, these are disk optimised controllers.
Signed-off-by: Alan Cox <[EMAIL PROTECTED]>
diff -u --new-file --recursive --exclude-from /usr/src/exclude
linux.vanilla-2.6.24-rc8-mm1/drivers/ata/pata_pdc202xx_old.c
linux-2.6.24-rc8-mm1/drivers/ata/pata_pdc202xx_old.c
--- linux.vanilla-2.6.24-rc8-mm1/drivers/ata/pata_pdc202xx_old.c
2008-01-19 14:47:56.000000000 +0000
+++ linux-2.6.24-rc8-mm1/drivers/ata/pata_pdc202xx_old.c 2008-01-19
15:19:25.000000000 +0000
@@ -243,6 +243,24 @@
return ata_sff_port_start(ap);
}
+/**
+ * pdc2026x_check_atapi_dma - Check whether ATAPI DMA can be supported for
this command
+ * @qc: Metadata associated with taskfile to check
+ *
+ * Just say no - not supported on older Promise.
+ *
+ * LOCKING:
+ * None (inherited from caller).
+ *
+ * RETURNS: 0 when ATAPI DMA can be used
+ * 1 otherwise
+ */
+
+static int pdc2026x_check_atapi_dma(struct ata_queued_cmd *qc)
+{
+ return 1;
+}
+
static struct scsi_host_template pdc202xx_sht = {
.module = THIS_MODULE,
.name = DRV_NAME,
@@ -310,6 +328,7 @@
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.cable_detect = pdc2026x_cable_detect,
+ .check_atapi_dma= pdc2026x_check_atapi_dma,
.bmdma_setup = ata_bmdma_setup,
.bmdma_start = pdc2026x_bmdma_start,
.bmdma_stop = pdc2026x_bmdma_stop,
--
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