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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2006-03-22 15:52:40 +0000
committerJeff Garzik <jeff@garzik.org>2006-03-22 19:55:40 -0500
commit09c7ad79dc62c499bb03d1ee92f838db2fc776c5 (patch)
tree70a17d139824c671f898c2cda7babeb1c7860636 /drivers
parent7c74ffd072fbe44b6039223982f2dc76840ac4f5 (diff)
[PATCH] libata: Fix a drive detection problem
The current code follows the spec but uses an overlong delay. This would be great if the hardware did. Several vendors however forget the D7 pulldown. Fortunately 0xFF isnt a sane reset state so we can use it to skip detection as is done in drivers/ide. (ie this is a tested solution over a long time) Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/scsi/libata-core.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 5d00bb721e2..477afb4a925 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -2001,9 +2001,19 @@ static unsigned int ata_bus_softreset(struct ata_port *ap,
* status is checked. Because waiting for "a while" before
* checking status is fine, post SRST, we perform this magic
* delay here as well.
+ *
+ * Old drivers/ide uses the 2mS rule and then waits for ready
*/
msleep(150);
+
+ /* Before we perform post reset processing we want to see if
+ the bus shows 0xFF because the odd clown forgets the D7 pulldown
+ resistor */
+
+ if (ata_check_status(ap) == 0xFF)
+ return 1; /* Positive is failure for some reason */
+
ata_bus_post_reset(ap, devmask);
return 0;