---

yaml --- r: 37495 b: refs/heads/master c: ae1b1a4 h: refs/heads/master i: 37493: c3ef3c5 37491: 9486063 37487: 4cca5d0 v: v3
git-mirror · Sep 21, 2006 · 084bb4c · 084bb4c
1 parent 634d65a
commit 084bb4c
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Showing 3 changed files with 9 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8624ecbf68e90e5a8124514a0b7f92767fb80a62
+refs/heads/master: ae1b1a4816ac11075d338af79a239f4c326d675c
diff --git a/trunk/drivers/char/drm/radeon_cp.c b/trunk/drivers/char/drm/radeon_cp.c
@@ -1258,6 +1258,13 @@ static void radeon_test_writeback(drm_radeon_private_t * dev_priv)
 		dev_priv->writeback_works = 0;
 		DRM_INFO("writeback forced off\n");
 	}
+
+	if (!dev_priv->writeback_works) {
+		/* Disable writeback to avoid unnecessary bus master transfer */
+		RADEON_WRITE(RADEON_CP_RB_CNTL, RADEON_READ(RADEON_CP_RB_CNTL) |
+			     RADEON_RB_NO_UPDATE);
+		RADEON_WRITE(RADEON_SCRATCH_UMSK, 0);
+	}
 }
 
 /* Enable or disable PCI-E GART on the chip */

diff --git a/trunk/drivers/char/drm/radeon_drv.h b/trunk/drivers/char/drm/radeon_drv.h
@@ -681,6 +681,7 @@ extern int r300_do_cp_cmdbuf(drm_device_t * dev, DRMFILE filp,
 #define RADEON_CP_RB_BASE		0x0700
 #define RADEON_CP_RB_CNTL		0x0704
 #	define RADEON_BUF_SWAP_32BIT		(2 << 16)
+#	define RADEON_RB_NO_UPDATE		(1 << 27)
 #define RADEON_CP_RB_RPTR_ADDR		0x070c
 #define RADEON_CP_RB_RPTR		0x0710
 #define RADEON_CP_RB_WPTR		0x0714