[cc'ing Alan, thanks for the information on the other message]
Tobias Müller wrote:
> Tejun Heo schrieb:
>> I don't know very well about CF but does it even fill UDMA/33? What
>> does 'dd if=/dev/sdc of=/dev/null bs=1M count=16 iflag=direct' say? You
>> can increase count for more reliable result.
>
> 16+0 Datensätze ein
> 16+0 Datensätze aus
> 16777216 Bytes (17 MB) kopiert, 0,561688 s, 29,9 MB/s
Hmmm... yeah, it almost fills UDMA/33. I wonder whether it would go higher.
> And hdparm -I /dev/sdc says it should be compatible to udma5.
>
> DMA: mdma0 mdma1 mdma2 udma0 udma1 *udma2 udma3 udma4
Please apply the attached patch and specify libata.force_cbl=80 as
kernel boot parameter. If you load libata from initrd or after boot you
need to pass 'force_cbl=80' as module parameter. How you do it depends
on your distro.
Thanks.
--
tejun
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 4753a18..8c93878 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -119,6 +119,10 @@ int libata_noacpi = 0;
module_param_named(noacpi, libata_noacpi, int, 0444);
MODULE_PARM_DESC(noacpi, "Disables the use of ACPI in probe/suspend/resume
when set");
+int libata_force_cbl = 0;
+module_param_named(force_cbl, libata_force_cbl, int, 0644);
+MODULE_PARM_DESC(force_cbl, "force PATA cable type (0=keep, 40=40c, 80=80c)");
+
MODULE_AUTHOR("Jeff Garzik");
MODULE_DESCRIPTION("Library module for ATA devices");
MODULE_LICENSE("GPL");
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index 21a81cd..7e53215 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -2296,9 +2296,27 @@ static int ata_eh_revalidate_and_attach(struct ata_link
*link,
/* PDIAG- should have been released, ask cable type if post-reset */
if (ata_is_host_link(link) && ap->ops->cable_detect &&
- (ehc->i.flags & ATA_EHI_DID_RESET))
+ (ehc->i.flags & ATA_EHI_DID_RESET)) {
ap->cbl = ap->ops->cable_detect(ap);
+ if (!(ap->flags & ATA_FLAG_SATA) && libata_force_cbl) {
+ switch (libata_force_cbl) {
+ case 40:
+ ata_port_printk(ap, KERN_INFO, "forcing 40c\n");
+ ap->cbl = ATA_CBL_PATA40;
+ break;
+ case 80:
+ ata_port_printk(ap, KERN_INFO, "forcing 80c\n");
+ ap->cbl = ATA_CBL_PATA80;
+ break;
+ default:
+ ata_port_printk(ap, KERN_WARNING,
+ "invalid force_cbl value %d\n",
+ libata_force_cbl);
+ }
+ }
+ }
+
/* Configure new devices forward such that user doesn't see
* device detection messages backwards.
*/
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index bbe59c2..b990a8d 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -60,6 +60,7 @@ extern int atapi_dmadir;
extern int atapi_passthru16;
extern int libata_fua;
extern int libata_noacpi;
+extern int libata_force_cbl;
extern struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev);
extern int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
u64 block, u32 n_block, unsigned int tf_flags,
