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Commit a9d055de authored by Kumar, Mahesh's avatar Kumar, Mahesh Committed by Matt Roper
Browse files

drm/i915: Add more wrapper for fixed_point_16_16 operations 



This patch adds few wrapper to perform fixed_point_16_16 operations
mul_round_up_u32_fixed16 : Multiplies u32 and fixed_16_16_t variables
			   & returns u32 result with rounding-up.
mul_fixed16 : Multiplies two fixed_16_16_t variable & returns fixed_16_16
div_round_up_fixed16 : Perform division operation on fixed_16_16_t
		       variables & return u32 result with round-off
div_round_up_u32_fixed16 : devide uint32_t variable by fixed_16_16 variable
			   and round_up the result to uint32_t.

These wrappers will be used by later patches in the series.

Changes from V1:
 - Rename wrapper as per Matt's comment
Changes from V2:
 - Fix indentation

Signed-off-by: default avatarMahesh Kumar <mahesh1.kumar@intel.com>
Reviewed-by: default avatarMatt Roper <matthew.d.roper@intel.com>
Reviewed-by: default avatarMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: default avatarMatt Roper <matthew.d.roper@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170517115831.13830-3-mahesh1.kumar@intel.com
parent afbc95cd

drivers/gpu/drm/i915/i915_drv.h

+43 −0
Original line number Diff line number Diff line
@@ -153,6 +153,38 @@ static inline uint_fixed_16_16_t max_fixed_16_16(uint_fixed_16_16_t max1, 
	return max;

}



static inline uint32_t div_round_up_fixed16(uint_fixed_16_16_t val,

					    uint_fixed_16_16_t d)

{

	return DIV_ROUND_UP(val.val, d.val);

}



static inline uint32_t mul_round_up_u32_fixed16(uint32_t val,

						uint_fixed_16_16_t mul)

{

	uint64_t intermediate_val;

	uint32_t result;



	intermediate_val = (uint64_t) val * mul.val;

	intermediate_val = DIV_ROUND_UP_ULL(intermediate_val, 1 << 16);

	WARN_ON(intermediate_val >> 32);

	result = clamp_t(uint32_t, intermediate_val, 0, ~0);

	return result;

}



static inline uint_fixed_16_16_t mul_fixed16(uint_fixed_16_16_t val,

					     uint_fixed_16_16_t mul)

{

	uint64_t intermediate_val;

	uint_fixed_16_16_t fp;



	intermediate_val = (uint64_t) val.val * mul.val;

	intermediate_val = intermediate_val >> 16;

	WARN_ON(intermediate_val >> 32);

	fp.val = clamp_t(uint32_t, intermediate_val, 0, ~0);

	return fp;

}



static inline uint_fixed_16_16_t fixed_16_16_div(uint32_t val, uint32_t d)

{

	uint_fixed_16_16_t fp, res;
@@ -175,6 +207,17 @@ static inline uint_fixed_16_16_t fixed_16_16_div_u64(uint32_t val, uint32_t d) 
	return res;

}



static inline uint32_t div_round_up_u32_fixed16(uint32_t val,

						uint_fixed_16_16_t d)

{

	uint64_t interm_val;



	interm_val = (uint64_t)val << 16;

	interm_val = DIV_ROUND_UP_ULL(interm_val, d.val);

	WARN_ON(interm_val >> 32);

	return clamp_t(uint32_t, interm_val, 0, ~0);

}



static inline uint_fixed_16_16_t mul_u32_fixed_16_16(uint32_t val,

						     uint_fixed_16_16_t mul)

{