From 8f6d08c9af284d74276da6681348e4673f13caea Mon Sep 17 00:00:00 2001
From: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Date: Thu, 21 Jan 2021 16:19:35 +0000
Subject: [PATCH] drm/i915: Check for all subplatform bits
Git-commit: 8f6d08c9af284d74276da6681348e4673f13caea
Patch-mainline: v5.11-rc6
No-fix: 27b695ee1af9bb36605e67055874ec081306ac28
References: git-fixes

Current code is checking only 2 bits in the subplatform, but actually 3
bits are allocated for the field. Check all 3 bits.

Fixes: 805446c8347c ("drm/i915: Introduce concept of a sub-platform")
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20210121161936.746591-1-tvrtko.ursulin@linux.intel.com
(cherry picked from commit 27b695ee1af9bb36605e67055874ec081306ac28)

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/i915_drv.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 632c713227dc..c6964f82a1bb 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1346,7 +1346,7 @@ intel_subplatform(const struct intel_runtime_info *info, enum intel_platform p)
 {
 	const unsigned int pi = __platform_mask_index(info, p);
 
-	return info->platform_mask[pi] & INTEL_SUBPLATFORM_BITS;
+	return info->platform_mask[pi] & ((1 << INTEL_SUBPLATFORM_BITS) - 1);
 }
 
 static __always_inline bool
-- 
2.26.2