[PATCH] ASoC: ux500: Parenthesize MSP_{RX,TX}_CLKPOL_BIT() arguments

[Sasha Levin]

arm allmodconfig fails to build with gcc:

  In file included from sound/soc/ux500/ux500_msp_i2s.c:20:
  sound/soc/ux500/ux500_msp_i2s.h:151:38: error: suggest parentheses
  around arithmetic in operand of '^' [-Werror=parentheses]
  sound/soc/ux500/ux500_msp_i2s.c:204:21: note: in expansion of macro
  'MSP_TX_CLKPOL_BIT'
  cc1: all warnings being treated as errors

The macros never parenthesized their argument:

  #define MSP_TX_CLKPOL_BIT(n)  ((n & TCKPOL_MASK) << TCKPOL_SHIFT)

That went unnoticed while every caller passed a plain variable, but
configure_protocol() now passes an XOR expression, which binds as
"a ^ (b & MASK)" rather than "(a ^ b) & MASK", and gcc rightly
complains.

No functional change: tx_clk_pol and rx_clk_pol only ever hold
MSP_FALLING_EDGE (0) or MSP_RISING_EDGE (1), and bclk_inverted is a
bool, so masking before or after the XOR gives the same 0/1 result.
Parenthesize the argument anyway - it fixes the build and stops the
macros from silently mis-evaluating a future composite argument.

Fixes: 9ccbacf5a012 ("ASoC: ux500: Validate MSP DAI configuration")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202609051547.G9SJp8UQ-lkp@xxxxxxxxx/
Assisted-by: LLM
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 sound/soc/ux500/ux500_msp_i2s.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/ux500/ux500_msp_i2s.h b/sound/soc/ux500/ux500_msp_i2s.h
index 2bf2699bdc49f..c66ef455e1380 100644
--- a/sound/soc/ux500/ux500_msp_i2s.h
+++ b/sound/soc/ux500/ux500_msp_i2s.h
@@ -147,8 +147,8 @@ enum msp_direction {
 #define RCKPOL_MASK		BIT(0)
 #define TCKPOL_MASK		BIT(0)
 #define SPICKM_MASK		(BIT(1) | BIT(0))
-#define MSP_RX_CLKPOL_BIT(n)     ((n & RCKPOL_MASK) << RCKPOL_SHIFT)
-#define MSP_TX_CLKPOL_BIT(n)     ((n & TCKPOL_MASK) << TCKPOL_SHIFT)
+#define MSP_RX_CLKPOL_BIT(n)     (((n) & RCKPOL_MASK) << RCKPOL_SHIFT)
+#define MSP_TX_CLKPOL_BIT(n)     (((n) & TCKPOL_MASK) << TCKPOL_SHIFT)
 
 #define P1ELEN_SHIFT		0
 #define P1FLEN_SHIFT		3
-- 
2.53.0