Hello, I wrote:
Make the SATA drive detection code from eighty_ninty_three() into inline
ide_dev_is_sata() helper fixing it along the way to be more strict while
checking word 80 for the reserved values...
Signed-off-by: Sergei Shtylyov <sshtylyov@xxxxxxxxxxxxx>
[...]
Index: linux-2.6/drivers/ide/ide-iops.c
===================================================================
--- linux-2.6.orig/drivers/ide/ide-iops.c
+++ linux-2.6/drivers/ide/ide-iops.c
@@ -580,8 +580,7 @@ u8 eighty_ninty_three (ide_drive_t *driv
if (hwif->cbl != ATA_CBL_PATA80)
goto no_80w;
- /* Check for SATA but only if we are ATA5 or higher */
- if (id->hw_config == 0 && (id->major_rev_num & 0x7FE0))
+ if (ide_dev_is_sata(id))
return 1;
/*
Index: linux-2.6/include/linux/ide.h
===================================================================
--- linux-2.6.orig/include/linux/ide.h
+++ linux-2.6/include/linux/ide.h
@@ -1380,6 +1380,19 @@ static inline int ide_dev_has_iordy(stru
return ((id->field_valid & 2) && (id->capability & 8)) ? 1 : 0;
}
+static inline int ide_dev_is_sata(struct hd_driveid *id)
+{
+ /*
+ * See if word 93 is 0 AND drive is at least ATA-5 compatible
+ * making sure that word 80 is valid by flipping its MSB --
+ * this trick allows us to filter out reserved values of 0
+ * and 0xffff along with the earlier ATA revisions.
+ */
+ if (id->hw_config == 0 && (id->major_rev_num ^ 0x8000) >= 0x8020)
+ return 1;
+ return 0;
+}
+
The same could have been achieved more simply:
if (id->hw_config == 0 && (short}id->major_rev_num >= 0x0020
so I'll probably recast...
MBR, Sergei
-
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