From d901348441642fadbd71ed2e37e74b3b2a7af97c Mon Sep 17 00:00:00 2001
From: Jordan Crouse <jordan.crouse@amd.com>
Date: Thu, 14 Dec 2006 17:28:48 -0700
Subject: Fix the memory mapping so its more sane, and disable XAA pixmap
 caches during rotation.

---
 src/amd_gx_driver.c | 20 +++++++-------------
 src/amd_gx_rotate.c | 34 +++++++++++++++++++++++++++++++++-
 2 files changed, 40 insertions(+), 14 deletions(-)

diff --git a/src/amd_gx_driver.c b/src/amd_gx_driver.c
index 99ff264..7548fc7 100644
--- a/src/amd_gx_driver.c
+++ b/src/amd_gx_driver.c
@@ -308,7 +308,9 @@ GXAllocateMemory(ScreenPtr pScrn, ScrnInfoPtr pScrni, int rotate)
 	}
     }
 
-    /* Set the memory available for the offscreen pixmaps */
+    /* XAA always exists - we can't remove it on demand like we can with EXA.
+       So we assume the worse, and only give XAA enough offspace room to
+       account for any eventuality that RandR might throw at us. */
 
     if (!pGeode->NoAccel) {
 
@@ -319,9 +321,6 @@ GXAllocateMemory(ScreenPtr pScrn, ScrnInfoPtr pScrni, int rotate)
 	    pExa->memorySize = fboffset + fbavail;
 	}
 
-	/* XXX - We don't use XAA if we are rotated, so this should be fine.  Changing the 
-	 * resolution will hurt us though */
-
 	if (!pGeode->useEXA) {
 
 	    if (!xf86FBManagerRunning(pScrn)) {
@@ -331,15 +330,10 @@ GXAllocateMemory(ScreenPtr pScrn, ScrnInfoPtr pScrni, int rotate)
 		RegionRec OffscreenRegion;
 		BoxRec AvailBox;
 
-		/* We only get one shot at allocating offscreen memory for XAA */
-		/* That means if the mode changes with RandR, we'll probably be out of luck. 
-		 * we can compensate for rotation by offsetting the start of offscreen memory to account
-		 * for the shadow framebuffer even if we're not using it right now 
-		 */
+		/* Assume the shadow FB exists even if it doesnt */
 
 		if (pGeode->shadowSize == 0) {
 		    size = (pScrn->width * bytpp) * pScrni->virtualX;
-
 		    offset += size;
 		    avail -= size;
 		}
@@ -709,9 +703,6 @@ GXPreInit(ScrnInfoPtr pScrni, int flags)
     else
 	pScrni->videoRam = pGeode->pEnt->device->videoRam;
 
-    if (!GXMapMem(pScrni))
-	return FALSE;
-
     pGeode->maxWidth = GX_MAX_WIDTH;
     pGeode->maxHeight = GX_MAX_HEIGHT;
 
@@ -1076,6 +1067,9 @@ GXEnterGraphics(ScreenPtr pScrn, ScrnInfoPtr pScrni)
 {
     GeodeRec *pGeode = GEODEPTR(pScrni);
 
+    if (!GXMapMem(pScrni))
+        return FALSE;
+
     gfx_wait_until_idle();
 
     /* Save off the current state (should this be somewhere else)? */
diff --git a/src/amd_gx_rotate.c b/src/amd_gx_rotate.c
index c5ae30a..3bc0d06 100644
--- a/src/amd_gx_rotate.c
+++ b/src/amd_gx_rotate.c
@@ -90,7 +90,7 @@ GXRotate(ScrnInfoPtr pScrni, DisplayModePtr mode)
     GeodeRec *pGeode = GEODEPTR(pScrni);
     ShadowUpdateProc update;
     Rotation curr = pGeode->rotation;
-    unsigned int pitch, dw;
+    unsigned int curdw = pScrni->displayWidth;
     PixmapPtr pPixmap;
     BOOL ret;
 
@@ -154,5 +154,37 @@ GXRotate(ScrnInfoPtr pScrni, DisplayModePtr mode)
 	PixmapBytePad(pScrni->displayWidth, pScrni->pScreen->rootDepth),
 	(pointer) (pGeode->FBBase + pScrni->fbOffset));
 
+    /* Don't use XAA pixmap cache or offscreen pixmaps when rotated */
+
+    if (pGeode->AccelInfoRec) {
+        if (pGeode->rotation == RR_Rotate_0) {
+            pGeode->AccelInfoRec->Flags = LINEAR_FRAMEBUFFER | OFFSCREEN_PIXMAPS | PIXMAP_CACHE;
+            pGeode->AccelInfoRec->UsingPixmapCache = TRUE;
+            pGeode->AccelInfoRec->maxOffPixWidth = 0;
+            pGeode->AccelInfoRec->maxOffPixHeight = 0;
+        }
+        else {
+            pGeode->AccelInfoRec->Flags = LINEAR_FRAMEBUFFER;
+            pGeode->AccelInfoRec->UsingPixmapCache = FALSE;
+            pGeode->AccelInfoRec->maxOffPixWidth = 1;
+            pGeode->AccelInfoRec->maxOffPixHeight = 1;
+        }
+    }
+
     return TRUE;
+
+error:
+    /* Restore the old rotation */
+    pScrni->displayWidth = curdw;
+
+    if (curr & (RR_Rotate_0 | RR_Rotate_180)) {
+        pScrni->pScreen->width = pScrni->virtualX;
+        pScrni->pScreen->height = pScrni->virtualY;
+    } else {
+        pScrni->pScreen->width = pScrni->virtualY;
+	pScrni->pScreen->height = pScrni->virtualX;
+    }
+
+    pGeode->rotation = curr;
+    return FALSE;
 }
-- 
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