[PATCH next] phy: mediatek: fix build warning of FIELD_PREP()

[Chunfeng Yun]

Change the inline function mtk_phy_update_field() into a macro to
avoid check warning of FIELD_PREP() with compiler parameter
-Wtautological-constant-out-of-range-compare

the warning is caused by mask check:
"BUILD_BUG_ON_MSG(__bf_cast_unsigned(_mask, _mask) >     \"

Fixes: 29c07477556e ("phy: mediatek: add a new helper to update bitfield")
Reported-by: kernel test robot <lkp at intel.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun at mediatek.com>
---
 drivers/phy/mediatek/phy-mtk-io.h | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/phy/mediatek/phy-mtk-io.h b/drivers/phy/mediatek/phy-mtk-io.h
index 9e9c6f221c92..d20ad5e5be81 100644
--- a/drivers/phy/mediatek/phy-mtk-io.h
+++ b/drivers/phy/mediatek/phy-mtk-io.h
@@ -37,9 +37,10 @@ static inline void mtk_phy_update_bits(void __iomem *reg, u32 mask, u32 val)
 }
 
 /* field @mask shall be constant and continuous */
-static inline void mtk_phy_update_field(void __iomem *reg, u32 mask, u32 val)
-{
-	mtk_phy_update_bits(reg, mask, FIELD_PREP(mask, val));
-}
+#define mtk_phy_update_field(reg, mask, val) \
+({ \
+	typeof(mask) mask_ = (mask);	\
+	mtk_phy_update_bits(reg, mask_, FIELD_PREP(mask_, val)); \
+})
 
 #endif
-- 
2.18.0