[PATCH] phy: freescale: fsl-samsung-hdmi: fix build error in fsl_samsung_hdmi_phy_configure_pll_lock_det

[Pei Xiao]

FIELD_PREP() checks that a constant fits into the available bitfield,
but the index div equals to 4,is out of range, which gcc
correctly complains about:

In function ‘fsl_samsung_hdmi_phy_configure_pll_lock_det’,
inlined from ‘fsl_samsung_hdmi_phy_configure’ at
drivers/phy/freescale/phy-fsl-samsung-hdmi.c :470:2:
././include/linux/compiler_types.h:542:38: error: call to ‘__compiletime_assert_538’
declared with attribute error: FIELD_PREP: value too large for the field
  542 |  _compiletime_assert(condition, msg, __compiletime_assert_,
__COUNTER__)
      |                                      ^
././include/linux/compiler_types.h:523:4: note: in definition of
macro ‘__compiletime_assert’ 523 |    prefix ## suffix();
      |    ^~~~~~
././include/linux/compiler_types.h:542:2: note: in expansion of macro
‘_compiletime_assert’
  542 |  _compiletime_assert(condition, msg, __compiletime_assert_,
 __COUNTER__)

Rework this so the field value which is restricted to the range of 0 to 3,
so build error will fix.

Fixes: d567679f2b6a ("phy: freescale: fsl-samsung-hdmi: Clean up fld_tg_code calculation")
Signed-off-by: Pei Xiao <xiaopei01@xxxxxxxxxx>
---
 drivers/phy/freescale/phy-fsl-samsung-hdmi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/phy/freescale/phy-fsl-samsung-hdmi.c b/drivers/phy/freescale/phy-fsl-samsung-hdmi.c
index 5eac70a1e858..3e4d1a5160ea 100644
--- a/drivers/phy/freescale/phy-fsl-samsung-hdmi.c
+++ b/drivers/phy/freescale/phy-fsl-samsung-hdmi.c
@@ -341,7 +341,7 @@ fsl_samsung_hdmi_phy_configure_pll_lock_det(struct fsl_samsung_hdmi_phy *phy,
 			break;
 	}
 
-	writeb(FIELD_PREP(REG12_CK_DIV_MASK, div), phy->regs + PHY_REG(12));
+	writeb(FIELD_PREP(REG12_CK_DIV_MASK, div == 4 ? div - 1 : div), phy->regs + PHY_REG(12));
 
 	/*
 	 * Calculation for the frequency lock detector target code (fld_tg_code)
-- 
2.25.1