1.6.4 brown-bag DGA fixes

[Keith Packard]

The fix I proposed doesn't solve the case where DGA is initialized
twice, once by the driver and once by the DiDGA layer. Here's a
version which has the DiDGA code override the driver DGA
initialization.

>From e1040dff8b783150a091dcf35c4ade21be40a5df Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp at keithp.com>
Date: Mon, 28 Sep 2009 12:39:47 -0700
Subject: [PATCH] Re-fix DGA removal.

Removing DGA ended up breaking any drivers calling into the old
xf86DiDGAInit function as it tried to see if DGA was already enabled
and ended up crashing if the VT wasn't completely initialized. Oops.

Also, if the driver initializes DGA itself, have the DiDGA
initialization overwrite that information as the DiDGA code will call
ReInit on mode detect.

Signed-off-by: Keith Packard <keithp at keithp.com>
---
 hw/xfree86/common/xf86DGA.c  |   29 ++++++++++++++++-------------
 hw/xfree86/modes/xf86Crtc.c  |    4 ++--
 hw/xfree86/modes/xf86Crtc.h  |    8 ++++++++
 hw/xfree86/modes/xf86DiDGA.c |   15 ++++++++++++---
 4 files changed, 38 insertions(+), 18 deletions(-)

diff --git a/hw/xfree86/common/xf86DGA.c b/hw/xfree86/common/xf86DGA.c
index a06f285..3f7deba 100644
--- a/hw/xfree86/common/xf86DGA.c
+++ b/hw/xfree86/common/xf86DGA.c
@@ -120,8 +120,22 @@ DGAInit(
 
     DGAScreenKey = &DGAScreenKeyIndex;
 
-    if(!(pScreenPriv = (DGAScreenPtr)xalloc(sizeof(DGAScreenRec))))
-	return FALSE;
+    pScreenPriv = DGA_GET_SCREEN_PRIV(pScreen);
+
+    if (!pScreenPriv)
+    {
+	if(!(pScreenPriv = (DGAScreenPtr)xalloc(sizeof(DGAScreenRec))))
+	    return FALSE;
+	dixSetPrivate(&pScreen->devPrivates, DGAScreenKey, pScreenPriv);
+	pScreenPriv->CloseScreen = pScreen->CloseScreen;
+	pScreen->CloseScreen = DGACloseScreen;
+	pScreenPriv->DestroyColormap = pScreen->DestroyColormap;
+	pScreen->DestroyColormap = DGADestroyColormap;
+	pScreenPriv->InstallColormap = pScreen->InstallColormap;
+	pScreen->InstallColormap = DGAInstallColormap;
+	pScreenPriv->UninstallColormap = pScreen->UninstallColormap;
+	pScreen->UninstallColormap = DGAUninstallColormap;
+    }
 
     pScreenPriv->pScrn = pScrn;
     pScreenPriv->numModes = num;
@@ -146,17 +160,6 @@ DGAInit(
 	    modes[i].flags &= ~DGA_PIXMAP_AVAILABLE;
 #endif
 
-    dixSetPrivate(&pScreen->devPrivates, DGAScreenKey, pScreenPriv);
-    pScreenPriv->CloseScreen = pScreen->CloseScreen;
-    pScreen->CloseScreen = DGACloseScreen;
-    pScreenPriv->DestroyColormap = pScreen->DestroyColormap;
-    pScreen->DestroyColormap = DGADestroyColormap;
-    pScreenPriv->InstallColormap = pScreen->InstallColormap;
-    pScreen->InstallColormap = DGAInstallColormap;
-    pScreenPriv->UninstallColormap = pScreen->UninstallColormap;
-    pScreen->UninstallColormap = DGAUninstallColormap;
-
-
     return TRUE;
 }
 
diff --git a/hw/xfree86/modes/xf86Crtc.c b/hw/xfree86/modes/xf86Crtc.c
index 899cea5..4f31511 100644
--- a/hw/xfree86/modes/xf86Crtc.c
+++ b/hw/xfree86/modes/xf86Crtc.c
@@ -770,7 +770,7 @@ xf86CrtcScreenInit (ScreenPtr screen)
     screen->CloseScreen = xf86CrtcCloseScreen;
     
 #ifdef XFreeXDGA
-    xf86DiDGAInit(screen, 0);
+    _xf86_di_dga_init_for_reals(screen);
 #endif
 #ifdef RANDR_13_INTERFACE
     return RANDR_INTERFACE_VERSION;
@@ -1887,7 +1887,7 @@ xf86SetScrnInfoModes (ScrnInfoPtr scrn)
     scrn->currentMode = scrn->modes;
 #ifdef XFreeXDGA
     if (scrn->pScreen)
-	    xf86DiDGAReInit(scrn->pScreen);
+	    _xf86_di_dga_reinit_for_reals(scrn->pScreen);
 #endif
 }
 
diff --git a/hw/xfree86/modes/xf86Crtc.h b/hw/xfree86/modes/xf86Crtc.h
index 0a596bc..0f79066 100644
--- a/hw/xfree86/modes/xf86Crtc.h
+++ b/hw/xfree86/modes/xf86Crtc.h
@@ -807,6 +807,10 @@ xf86OutputGetEDID (xf86OutputPtr output, I2CBusPtr pDDCBus);
 Bool
 xf86DiDGAInit (ScreenPtr pScreen, unsigned long dga_address);
 
+/* this is the real function, used only internally */
+_X_INTERNAL Bool
+_xf86_di_dga_init_for_reals (ScreenPtr pScreen);
+
 /**
  * Re-initialize dga for this screen (as when the set of modes changes)
  */
@@ -814,6 +818,10 @@ xf86DiDGAInit (ScreenPtr pScreen, unsigned long dga_address);
 Bool
 xf86DiDGAReInit (ScreenPtr pScreen);
 
+/* This is the real function, used only internally */
+_X_INTERNAL Bool
+_xf86_di_dga_reinit_for_reals (ScreenPtr pScreen);
+
 /*
  * Set the subpixel order reported for the screen using
  * the information from the outputs
diff --git a/hw/xfree86/modes/xf86DiDGA.c b/hw/xfree86/modes/xf86DiDGA.c
index 3992c09..f93810d 100644
--- a/hw/xfree86/modes/xf86DiDGA.c
+++ b/hw/xfree86/modes/xf86DiDGA.c
@@ -175,6 +175,12 @@ static DGAFunctionRec xf86_dga_funcs = {
 _X_EXPORT Bool
 xf86DiDGAReInit (ScreenPtr pScreen)
 {
+    return TRUE;
+}
+
+_X_INTERNAL Bool
+_xf86_di_dga_reinit_for_reals (ScreenPtr pScreen)
+{
     ScrnInfoPtr		scrn = xf86Screens[pScreen->myNum];
     xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
     
@@ -190,12 +196,15 @@ xf86DiDGAReInit (ScreenPtr pScreen)
 _X_EXPORT Bool
 xf86DiDGAInit (ScreenPtr pScreen, unsigned long dga_address)
 {
+    return TRUE;
+}
+
+_X_INTERNAL Bool
+_xf86_di_dga_init_for_reals (ScreenPtr pScreen)
+{
     ScrnInfoPtr		scrn = xf86Screens[pScreen->myNum];
     xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
 
-    if (DGAAvailable(pScreen->myNum))
-	return TRUE;
-
     xf86_config->dga_flags = 0;
     xf86_config->dga_address = 0;
     xf86_config->dga_width = 0;
-- 
1.6.4.3
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 190 bytes
Desc: not available
URL: <http://lists.x.org/archives/xorg/attachments/20090929/b0d445d8/attachment.pgp>