--- zzzz-none-000/linux-2.6.39.4/drivers/gpu/drm/radeon/atombios_crtc.c	2011-08-03 19:43:28.000000000 +0000
+++ puma6-atom-6490-729/linux-2.6.39.4/drivers/gpu/drm/radeon/atombios_crtc.c	2021-11-10 13:38:14.000000000 +0000
@@ -1011,7 +1011,7 @@
 	uint64_t fb_location;
 	uint32_t fb_format, fb_pitch_pixels, tiling_flags;
 	u32 fb_swap = EVERGREEN_GRPH_ENDIAN_SWAP(EVERGREEN_GRPH_ENDIAN_NONE);
-	u32 tmp, viewport_w, viewport_h;
+	u32 tmp;
 	int r;
 
 	/* no fb bound */
@@ -1137,10 +1137,8 @@
 	y &= ~1;
 	WREG32(EVERGREEN_VIEWPORT_START + radeon_crtc->crtc_offset,
 	       (x << 16) | y);
-	viewport_w = crtc->mode.hdisplay;
-	viewport_h = (crtc->mode.vdisplay + 1) & ~1;
 	WREG32(EVERGREEN_VIEWPORT_SIZE + radeon_crtc->crtc_offset,
-	       (viewport_w << 16) | viewport_h);
+	       (crtc->mode.hdisplay << 16) | crtc->mode.vdisplay);
 
 	/* pageflip setup */
 	/* make sure flip is at vb rather than hb */
@@ -1181,7 +1179,7 @@
 	uint64_t fb_location;
 	uint32_t fb_format, fb_pitch_pixels, tiling_flags;
 	u32 fb_swap = R600_D1GRPH_SWAP_ENDIAN_NONE;
-	u32 tmp, viewport_w, viewport_h;
+	u32 tmp;
 	int r;
 
 	/* no fb bound */
@@ -1306,10 +1304,8 @@
 	y &= ~1;
 	WREG32(AVIVO_D1MODE_VIEWPORT_START + radeon_crtc->crtc_offset,
 	       (x << 16) | y);
-	viewport_w = crtc->mode.hdisplay;
-	viewport_h = (crtc->mode.vdisplay + 1) & ~1;
 	WREG32(AVIVO_D1MODE_VIEWPORT_SIZE + radeon_crtc->crtc_offset,
-	       (viewport_w << 16) | viewport_h);
+	       (crtc->mode.hdisplay << 16) | crtc->mode.vdisplay);
 
 	/* pageflip setup */
 	/* make sure flip is at vb rather than hb */