[Intel-gfx] [PATCH] drm/i915: Check for all subplatform bits

[Chris Wilson]

From: Umesh Nerlige Ramappa <umesh.nerlige.ramappa at intel.com>

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

v2: Apply the SUBPLATFORM_MASK bikeshed as it turns out we missed
another place BITS was used as a MASK.

Fixes: 805446c8347c9 (drm/i915: Introduce concept of a sub-platform)
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa at intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com> #v1
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20210120012111.44184-2-umesh.nerlige.ramappa@intel.com
---
 drivers/gpu/drm/i915/i915_drv.h          | 2 +-
 drivers/gpu/drm/i915/intel_device_info.c | 2 +-
 drivers/gpu/drm/i915/intel_device_info.h | 1 +
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index f0222de2d216..7efb501e22d2 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1343,7 +1343,7 @@ 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] & INTEL_SUBPLATFORM_MASK;
 }
 
 static __always_inline bool
diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
index 699412c14c1d..7d98a718a051 100644
--- a/drivers/gpu/drm/i915/intel_device_info.c
+++ b/drivers/gpu/drm/i915/intel_device_info.c
@@ -223,7 +223,7 @@ void intel_device_info_subplatform_init(struct drm_i915_private *i915)
 		}
 	}
 
-	GEM_BUG_ON(mask & ~INTEL_SUBPLATFORM_BITS);
+	GEM_BUG_ON(mask & ~INTEL_SUBPLATFORM_MASK);
 
 	RUNTIME_INFO(i915)->platform_mask[pi] |= mask;
 }
diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h
index 79dab5a6f272..2ceafedeb62f 100644
--- a/drivers/gpu/drm/i915/intel_device_info.h
+++ b/drivers/gpu/drm/i915/intel_device_info.h
@@ -94,6 +94,7 @@ enum intel_platform {
  */
 
 #define INTEL_SUBPLATFORM_BITS (3)
+#define INTEL_SUBPLATFORM_MASK GENMASK(INTEL_SUBPLATFORM_BITS - 1, 0)
 
 /* HSW/BDW/SKL/KBL/CFL */
 #define INTEL_SUBPLATFORM_ULT	(0)
-- 
2.20.1