[patch] Ignore bad result of i8042 AUX test - happens on Dell machines

[patch] Ignore bad result of i8042 AUX test - happens on Dell machines

[Vojtech Pavlik]

Hi!

You can import this changeset into BK by piping this whole message to:
'| bk receive [path to repository]' or apply the patch as usual.
'bk pull bk://linux-input.bkbits.net/linux-input' should work as well.

===================================================================

ChangeSet@1.543, 2002-08-30 11:22:23+02:00, vojtech@suse.cz
  Ignore error 0xff - 'general error' in AUX wire test in i8042.c,
  some mainboards (Andrew Morton's Dell) report that even when everything
  is okay with AUX. Also remove a check for very old AMI i8042's, which
  could generate false positives on modern buggy mainboards.


 i8042.c |   17 ++++-------------
 1 files changed, 4 insertions(+), 13 deletions(-)

===================================================================

diff -Nru a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
--- a/drivers/input/serio/i8042.c	Fri Aug 30 11:25:07 2002
+++ b/drivers/input/serio/i8042.c	Fri Aug 30 11:25:07 2002
@@ -576,9 +576,12 @@
 
 /*
  * External connection test - filters out AT-soldered PS/2 i8042's
+ * 0x00 - no error, 0x01-0x03 - clock/data stuck, 0xff - general error
+ * We ignore general error, since some chips report it even under normal
+ * operation.
  */
 
-	if (i8042_command(&param, I8042_CMD_AUX_TEST) || param)
+	if (i8042_command(&param, I8042_CMD_AUX_TEST) || (param && param != 0xff))
 		return -1;
 
 /*
@@ -587,23 +590,11 @@
 	
 	if (i8042_command(&param, I8042_CMD_AUX_DISABLE))
 		return -1;
-
 	if (i8042_command(&param, I8042_CMD_CTL_RCTR) || (~param & I8042_CTR_AUXDIS))
 		return -1;	
 
-	if (i8042_command(&param, I8042_CMD_AUX_TEST) || param) {
-
-/*
- * We've got an old AMI i8042 with 'Bad Cache' commands.
- */
-
-		i8042_command(&param, I8042_CMD_AUX_ENABLE);
-		return -1;
-	}
-
 	if (i8042_command(&param, I8042_CMD_AUX_ENABLE))
 		return -1;
-
 	if (i8042_command(&param, I8042_CMD_CTL_RCTR) || (param & I8042_CTR_AUXDIS))
 		return -1;	
 

===================================================================

This BitKeeper patch contains the following changesets:
+
## Wrapped with gzip_uu ##


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!````
`
end

-- 
Vojtech Pavlik
SuSE Labs