From: Ankit Nautiyal Date: Wed, 24 Sep 2025 14:15:39 +0000 (+0530) Subject: drm/i915/reg_defs: Add REG_FIELD_MAX wrapper for FIELD_MAX() X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=94da8e5eee9c2e33cc1d2d61029c9db0c6c5a55a;p=thirdparty%2Fkernel%2Flinux.git drm/i915/reg_defs: Add REG_FIELD_MAX wrapper for FIELD_MAX() Introduce REG_FIELD_MAX macro as local wrapper around FIELD_MAX() to return the maximum value representable by a bit mask. The value is cast to u32 for consistency with other REG_* macros and assumes the bitfield fits within 32 bits. v2: Use __mask as macro argument aligning with other macros. (Ville) Signed-off-by: Ankit Nautiyal Reviewed-by: Ville Syrjälä Reviewed-by: Andi Shyti Link: https://lore.kernel.org/r/20250924141542.3122126-8-ankit.k.nautiyal@intel.com --- diff --git a/drivers/gpu/drm/i915/i915_reg_defs.h b/drivers/gpu/drm/i915/i915_reg_defs.h index bfe98cb9a0384..e81fac8ab51b5 100644 --- a/drivers/gpu/drm/i915/i915_reg_defs.h +++ b/drivers/gpu/drm/i915/i915_reg_defs.h @@ -174,6 +174,16 @@ */ #define REG_FIELD_GET8(__mask, __val) ((u8)FIELD_GET(__mask, __val)) +/** + * REG_FIELD_MAX() - produce the maximum value representable by a field + * @__mask: shifted mask defining the field's length and position + * + * Local wrapper for FIELD_MAX() to return the maximum bit value that can + * be held in the field specified by @_mask, cast to u32 for consistency + * with other macros. + */ +#define REG_FIELD_MAX(__mask) ((u32)FIELD_MAX(__mask)) + typedef struct { u32 reg; } i915_reg_t;