[commit] r2493 - dev/olpc/dcon

[repository service]

Author: wmb
Date: Wed Aug 31 10:24:22 2011
New Revision: 2493
URL: http://tracker.coreboot.org/trac/openfirmware/changeset/2493

Log:
XO-1.75 - DCON driver - Use GPIO edge detection hardware to avoid the need for disabling interrupts while waiting for DCON freeze - prevents audio buffer underrun.

Modified:
   dev/olpc/dcon/mmp2dcon.fth

Modified: dev/olpc/dcon/mmp2dcon.fth
==============================================================================
--- dev/olpc/dcon/mmp2dcon.fth	Wed Aug 31 10:22:38 2011	(r2492)
+++ dev/olpc/dcon/mmp2dcon.fth	Wed Aug 31 10:24:22 2011	(r2493)
@@ -75,7 +75,8 @@
 [then]
 \ : dcon-blnk?  ( -- flag )  ;  \ Not hooked up
 : dcon-stat@  ( -- n )  h# 019100 io@ 4 rshift 3 and  ;
-: dcon-irq?  ( -- flag )  d# 124 gpio-pin@  0=  ;
+: setup-dcon-irq  ( -- )  d# 124 dup gpio-set-fer  gpio-clr-edge  ;
+: dcon-irq?  ( -- flag )  d# 124 gpio-edge@  ;

\ DCONSTAT values:  0 SCANINT  1 SCANINT_DCON  2 DISPLAYLOAD  3 MISSED

@@ -122,8 +123,9 @@
    else
       has-dcon-ram?  if
          begin                             ( )
+            setup-dcon-irq
             dcon-unload  \ Put the DCON in self-refresh mode
-            lock[ wait-dcon-mode ]unlock   ( retry? )
+            wait-dcon-mode                 ( retry? )
             \        display-off           ( retry? )
          while                             ( )
             \ We got a false ack from the DCON so start over from LOAD state