drm/i915: adjust framebuffer base address on gen4+
The tileoffset register only supports a limited offset in x/y of 4096,
so for giant screen configuration with a shared fb we wrap around.
Fix this by computing a linear offset in tiles (pages) and only use
the tileoffset register to offset within the tile.
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 4a2ea42..da7484e 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2986,7 +2986,7 @@
#define I915_LO_DISPBASE(val) (val & ~DISP_BASEADDR_MASK)
#define I915_HI_DISPBASE(val) (val & DISP_BASEADDR_MASK)
#define I915_MODIFY_DISPBASE(reg, gfx_addr) \
- (I915_WRITE(reg, gfx_addr | I915_LO_DISPBASE(I915_READ(reg))))
+ (I915_WRITE((reg), (gfx_addr) | I915_LO_DISPBASE(I915_READ(reg))))
/* VBIOS flags */
#define SWF00 0x71410