drm/i915: there's no DSPSIZE register on gen4+

So don't read it when capturing the error state. This solves some
"unclaimed register" messages on Haswell when we hang the GPU.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 1dc6c18f3970..1e706769de66 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -9346,7 +9346,8 @@ intel_display_capture_error_state(struct drm_device *dev)
 
                 error->plane[i].control = I915_READ(DSPCNTR(i));
                 error->plane[i].stride = I915_READ(DSPSTRIDE(i));
-                error->plane[i].size = I915_READ(DSPSIZE(i));
+                if (INTEL_INFO(dev)->gen <= 3)
+                        error->plane[i].size = I915_READ(DSPSIZE(i));
                 error->plane[i].pos = I915_READ(DSPPOS(i));
                 error->plane[i].addr = I915_READ(DSPADDR(i));
                 if (INTEL_INFO(dev)->gen >= 4) {
@@ -9390,7 +9391,8 @@ intel_display_print_error_state(struct seq_file *m,
                 seq_printf(m, "Plane [%d]:\n", i);
                 seq_printf(m, "  CNTR: %08x\n", error->plane[i].control);
                 seq_printf(m, "  STRIDE: %08x\n", error->plane[i].stride);
-                seq_printf(m, "  SIZE: %08x\n", error->plane[i].size);
+                if (INTEL_INFO(dev)->gen <= 3)
+                        seq_printf(m, "  SIZE: %08x\n", error->plane[i].size);
                 seq_printf(m, "  POS: %08x\n", error->plane[i].pos);
                 seq_printf(m, "  ADDR: %08x\n", error->plane[i].addr);
                 if (INTEL_INFO(dev)->gen >= 4) {