xfree86: Remove the pretense of EDID v2 support

We don't do anything with EDID v2 blocks besides publish them on the
root window.  Worse, the check deleted by this patch would attempt to
take a checksum of arbitrary memory if the rawData array isn't 256+
bytes long (and, for the monitors mentioned, it probably is only 128).

Reviewed-by: Mark Kettenis <kettenis@openbsd.org>
Signed-off-by: Adam Jackson <ajax@redhat.com>

1 files changed, 4 insertions, 43 deletions

diff --git a/hw/xfree86/ddc/ddcProperty.c b/hw/xfree86/ddc/ddcProperty.c
index 5d6eec927..c3aced5c2 100644
--- a/hw/xfree86/ddc/ddcProperty.c
+++ b/hw/xfree86/ddc/ddcProperty.c
@@ -33,7 +33,6 @@
 #include <string.h>
 
 #define EDID1_ATOM_NAME         "XFree86_DDC_EDID1_RAWDATA"
-#define EDID2_ATOM_NAME         "XFree86_DDC_EDID2_RAWDATA"
 
 static void
 edidMakeAtom(int i, const char *name, CARD8 *data, int size)
@@ -52,59 +51,21 @@ edidMakeAtom(int i, const char *name, CARD8 *data, int size)
 static void
 addRootWindowProperties(ScrnInfoPtr pScrn, xf86MonPtr DDC)
 {
-    int i, scrnIndex = pScrn->scrnIndex;
-    Bool makeEDID1prop = FALSE;
-    Bool makeEDID2prop = FALSE;
+    int scrnIndex = pScrn->scrnIndex;
 
     if (DDC->flags & MONITOR_DISPLAYID) {
 	/* Don't bother, use RANDR already */
 	return;
     } else if (DDC->ver.version == 1) {
-	makeEDID1prop = TRUE;
-    } else if (DDC->ver.version == 2) {
-	int checksum1;
-	int checksum2;
-	makeEDID2prop = TRUE;
+	int size = 128 +
+	    (DDC->flags & EDID_COMPLETE_RAWDATA ? DDC->no_sections * 128 : 0);
 
-	/* Some monitors (eg Panasonic PanaSync4)
-	 * report version==2 because they used EDID v2 spec document,
-	 * although they use EDID v1 data structure :-(
-	 *
-	 * Try using checksum to determine when we have such a monitor.
-	 */
-	checksum2 = 0;
-	for (i = 0; i < 256; i++)
-	    checksum2 += DDC->rawData[i];
-	if (checksum2 % 256) {
-	    xf86DrvMsg(scrnIndex, X_INFO, "Monitor EDID v2 checksum failed\n");
-	    xf86DrvMsg(scrnIndex, X_INFO,
-		    "XFree86_DDC_EDID2_RAWDATA property may be bad\n");
-	    checksum1 = 0;
-	    for (i = 0; i < 128; i++)
-		checksum1 += DDC->rawData[i];
-	    if (!(checksum1 % 256)) {
-		xf86DrvMsg(scrnIndex, X_INFO,
-			"Monitor EDID v1 checksum passed,\n");
-		xf86DrvMsg(scrnIndex, X_INFO,
-			"XFree86_DDC_EDID1_RAWDATA property created\n");
-		makeEDID1prop = TRUE;
-	    }
-	}
+	edidMakeAtom(scrnIndex, EDID1_ATOM_NAME, DDC->rawData, size);
     } else {
 	xf86DrvMsg(scrnIndex, X_PROBED, "unexpected EDID version %d.%d\n",
 		DDC->ver.version, DDC->ver.revision);
 	return;
     }
-
-    if (makeEDID1prop) {
-	int size = 128 +
-	    (DDC->flags & EDID_COMPLETE_RAWDATA ? DDC->no_sections * 128 : 0);
-
-	edidMakeAtom(scrnIndex, EDID1_ATOM_NAME, DDC->rawData, size);
-    } 
-
-    if (makeEDID2prop)
-	edidMakeAtom(scrnIndex, EDID2_ATOM_NAME, DDC->rawData, 256);
 }
 
 Bool