Improve detection of reduced blanking monitors.

We now cycle through the EDID provided modes list to find reduced blanking
modes. If found, the driver will now allow reduced blanking for this
monitor.
In case this still fails, we now have Option "ForceReduced", to force
reduced blanking on all or no monitors.

1 files changed, 18 insertions, 7 deletions

diff --git a/src/rhd_edid.c b/src/rhd_edid.c
index ba16ae1..1262ccf 100644
--- a/src/rhd_edid.c
+++ b/src/rhd_edid.c
@@ -221,6 +221,23 @@ EDIDGuessRangesFromModes(struct rhdMonitor *Monitor, DisplayModePtr Modes)
 }
 
 /*
+ * Determine whether this monitor does allow reduced blanking.
+ * Do not set it to false, to allow the user to specify this too.
+ */
+static void
+EDIDReducedAllowed(struct rhdMonitor *Monitor, DisplayModePtr Modes)
+{
+    DisplayModePtr Mode;
+
+    for (Mode = Modes; Mode; Mode = Mode->next)
+	if (((Mode->HTotal - Mode->HDisplay) == 160) &&
+	    ((Mode->HSyncEnd - Mode->HDisplay) == 80) &&
+            ((Mode->HSyncEnd - Mode->HSyncStart) == 32) &&
+            ((Mode->VSyncStart - Mode->VDisplay) == 3))
+	    Monitor->ReducedAllowed = TRUE;
+}
+
+/*
  * Fill out rhdMonitor with xf86MonPtr information.
  */
 void
@@ -237,12 +254,6 @@ RHDMonitorEDIDSet(struct rhdMonitor *Monitor, xf86MonPtr EDID)
     snprintf(Monitor->Name, 9, "%s-%04X", EDID->vendor.name,
              EDID->vendor.prod_id);
 
-    /* If this is a digital display, then we can use reduced blanking
-     * What about my VMP 453? */
-    if (EDID->features.input_type)
-        Monitor->ReducedAllowed = TRUE;
-    /* Allow the user to also enable this through config */
-
     /* Add established timings */
     Mode = EDIDModesFromEstablished(Monitor->scrnIndex, &EDID->timings1);
     Modes = RHDModesAdd(Modes, Mode);
@@ -304,7 +315,7 @@ RHDMonitorEDIDSet(struct rhdMonitor *Monitor, xf86MonPtr EDID)
 
     if (Modes) {
 	EDIDGuessRangesFromModes(Monitor, Modes);
-
+	EDIDReducedAllowed(Monitor, Modes);
         Monitor->Modes = RHDModesAdd(Monitor->Modes, Modes);
     }
 }