The mask was added in commit e5f415bfc5c2 ("drm/i915: Add missing mask
when reading GEN12_DSMBASE"), but then looks to be dropped in some
unrelated code movement in commit dbb2ffbfd708 ("drm/i915/mtl: enable
local stolen memory") without explanation. Add it back.

Fixes: dbb2ffbfd708 ("drm/i915/mtl: enable local stolen memory")
Signed-off-by: Matthew Auld <[email protected]>
Cc: Aravind Iddamsetty <[email protected]>
Cc: Lucas De Marchi <[email protected]>
Cc: Matt Roper <[email protected]>
---
 drivers/gpu/drm/i915/gem/i915_gem_stolen.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c 
b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
index 910086974454..2c4922961f33 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
@@ -910,7 +910,7 @@ i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, 
u16 type,
                GEM_BUG_ON((dsm_size + SZ_8M) > lmem_size);
        } else {
                /* Use DSM base address instead for stolen memory */
-               dsm_base = intel_uncore_read64(uncore, GEN12_DSMBASE);
+               dsm_base = intel_uncore_read64(uncore, GEN12_DSMBASE) & 
GEN12_BDSM_MASK;
                if (WARN_ON(lmem_size < dsm_base))
                        return ERR_PTR(-ENODEV);
                dsm_size = lmem_size - dsm_base;
-- 
2.37.3

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