drm/radeon/kms: set crtc and cursor offsets correctly on legacy chips.

The crtc and cursor offsets on the legacy chips are offset from
DISPLAY_BASE_ADDR. The code worked if display base addr was at 0,
but otherwise falls to pieces.
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/radeon_cursor.c

@@ -113,7 +113,7 @@ static void radeon_set_cursor(struct drm_crtc *crtc, struct drm_gem_object *obj,
 		WREG32(AVIVO_D1CUR_SURFACE_ADDRESS + radeon_crtc->crtc_offset, gpu_addr);
 	else
 		/* offset is from DISP(2)_BASE_ADDRESS */
-		WREG32(RADEON_CUR_OFFSET + radeon_crtc->crtc_offset, gpu_addr);
+		WREG32(RADEON_CUR_OFFSET + radeon_crtc->crtc_offset, (gpu_addr-radeon_crtc->legacy_display_base_addr));
 }
 
 int radeon_crtc_cursor_set(struct drm_crtc *crtc,

drivers/gpu/drm/radeon/radeon_legacy_crtc.c

@@ -244,7 +244,12 @@ int radeon_crtc_set_base(struct drm_crtc *crtc, int x, int y,
 	if (radeon_gem_object_pin(obj, RADEON_GEM_DOMAIN_VRAM, &base)) {
 		return -EINVAL;
 	}
-	crtc_offset = (u32)base;
+	/* if scanout was in GTT this really wouldn't work */
+	/* crtc offset is from display base addr not FB location */
+	radeon_crtc->legacy_display_base_addr = rdev->mc.vram_location;
+
+	base -= radeon_crtc->legacy_display_base_addr;
+
 	crtc_offset_cntl = 0;
 
 	pitch_pixels = crtc->fb->pitch / (crtc->fb->bits_per_pixel / 8);
@@ -303,11 +308,9 @@ int radeon_crtc_set_base(struct drm_crtc *crtc, int x, int y,
 
 	base &= ~7;
 
-	/* update sarea TODO */
-
 	crtc_offset = (u32)base;
 
-	WREG32(RADEON_DISPLAY_BASE_ADDR + radeon_crtc->crtc_offset, rdev->mc.vram_location);
+	WREG32(RADEON_DISPLAY_BASE_ADDR + radeon_crtc->crtc_offset, radeon_crtc->legacy_display_base_addr);
 
 	if (ASIC_IS_R300(rdev)) {
 		if (radeon_crtc->crtc_id)

drivers/gpu/drm/radeon/radeon_mode.h

@@ -185,6 +185,7 @@ struct radeon_crtc {
 	uint64_t cursor_addr;
 	int cursor_width;
 	int cursor_height;
+	uint32_t legacy_display_base_addr;
 };
 
 #define RADEON_USE_RMX 1