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drm/i915/reg_defs: Add REG_FIELD_MAX wrapper for FIELD_MAX()

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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 <ankit.k.nautiyal@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://lore.kernel.org/r/20250924141542.3122126-8-ankit.k.nautiyal@intel.com
This commit is contained in:
Ankit Nautiyal 2025-09-24 19:45:39 +05:30
parent 4e5c033cfe
commit 94da8e5eee
1 changed files with 10 additions and 0 deletions
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10
drivers/gpu/drm/i915/i915_reg_defs.h
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@ -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;