diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_uncore.h')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_uncore.h | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/drivers/gpu/drm/i915/intel_uncore.h b/drivers/gpu/drm/i915/intel_uncore.h index 414fc2cb0459..dcfa243892c6 100644 --- a/drivers/gpu/drm/i915/intel_uncore.h +++ b/drivers/gpu/drm/i915/intel_uncore.h @@ -378,23 +378,23 @@ intel_uncore_read64_2x32(struct intel_uncore *uncore, static inline void intel_uncore_rmw(struct intel_uncore *uncore, i915_reg_t reg, u32 clear, u32 set) { - u32 val; + u32 old, val; - val = intel_uncore_read(uncore, reg); - val &= ~clear; - val |= set; - intel_uncore_write(uncore, reg, val); + old = intel_uncore_read(uncore, reg); + val = (old & ~clear) | set; + if (val != old) + intel_uncore_write(uncore, reg, val); } static inline void intel_uncore_rmw_fw(struct intel_uncore *uncore, i915_reg_t reg, u32 clear, u32 set) { - u32 val; + u32 old, val; - val = intel_uncore_read_fw(uncore, reg); - val &= ~clear; - val |= set; - intel_uncore_write_fw(uncore, reg, val); + old = intel_uncore_read_fw(uncore, reg); + val = (old & ~clear) | set; + if (val != old) + intel_uncore_write_fw(uncore, reg, val); } static inline int intel_uncore_write_and_verify(struct intel_uncore *uncore, |