There's no need to keep reading random registers in i915_swizzle_info if
the platform is not doing GPU side swizzling.
After HSW, swizzling is not used, and the CPU's memory controller
performs all the address swizzling modifications, commit be292e1563ac5b
("drm/i915/bdw: Let the memory controller do all the swizzling").
Cc: Daniele Ceraolo Spurio <[email protected]>
Signed-off-by: Michel Thierry <[email protected]>
---
drivers/gpu/drm/i915/i915_debugfs.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
b/drivers/gpu/drm/i915/i915_debugfs.c
index 87e13131f6ea..e82f503389fb 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2152,6 +2152,11 @@ static int i915_swizzle_info(struct seq_file *m, void
*data)
{
struct drm_i915_private *dev_priv = node_to_i915(m->private);
+ if (INTEL_GEN(dev_priv) >= 8 || IS_VALLEYVIEW(dev_priv)) {
+ seq_puts(m, "not supported - CPU does all the swizzling\n");
+ return 0;
+ }
+
intel_runtime_pm_get(dev_priv);
seq_printf(m, "bit6 swizzle for X-tiling = %s\n",
--
2.11.0
_______________________________________________
Intel-gfx mailing list
[email protected]
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
