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 <[email protected]> Reviewed-by: Ville Syrjälä <[email protected]> Reviewed-by: Andi Shyti <[email protected]> --- drivers/gpu/drm/i915/i915_reg_defs.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_reg_defs.h b/drivers/gpu/drm/i915/i915_reg_defs.h index bfe98cb9a038..e81fac8ab51b 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; -- 2.45.2
