From 991914274bdde1e0de28cadc8eca4c736ec3fd07 Mon Sep 17 00:00:00 2001 From: Joonas Lahtinen Date: Wed, 7 Dec 2016 16:22:39 +0200 Subject: [PATCH] drm/i915: Catch non-existent registers in find_fw_domain Add WARN_ON to find_fw_domain to registers related to uninitialized hardware. v2: - Print the uninitialized domains and register (Chris) Cc: Imre Deak Cc: Wang Elaine Cc: Chris Wilson Signed-off-by: Joonas Lahtinen Reviewed-by: Chris Wilson Link: http://patchwork.freedesktop.org/patch/msgid/1481120559-17413-1-git-send-email-joonas.lahtinen@linux.intel.com --- drivers/gpu/drm/i915/intel_uncore.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c index 2007b138af0e..8fc5f29e79a8 100644 --- a/drivers/gpu/drm/i915/intel_uncore.c +++ b/drivers/gpu/drm/i915/intel_uncore.c @@ -625,7 +625,14 @@ find_fw_domain(struct drm_i915_private *dev_priv, u32 offset) dev_priv->uncore.fw_domains_table_entries, fw_range_cmp); - return entry ? entry->domains : 0; + if (!entry) + return 0; + + WARN(entry->domains & ~dev_priv->uncore.fw_domains, + "Uninitialized forcewake domain(s) 0x%x accessed at 0x%x\n", + entry->domains & ~dev_priv->uncore.fw_domains, offset); + + return entry->domains; } static void -- 2.20.1