Op 08-05-17 om 13:48 schreef Mahesh Kumar:
> This patch adds few wrapper to perform fixed_point_16_16 operations
> mul_u32_fixed_16_16_round_up : Multiplies u32 and fixed_16_16_t
> variables & returns u32 result with
> rounding-off.
> mul_fixed_16_16 : Multiplies two fixed_16_16_t variable & returns
> fixed_16_16
> div_round_up_fixed_16_16 : Perform division operation on fixed_16_16_t
> variables & return u32 result with round-off
> fixed_16_16_div_round_up_u64 : 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.
>
> Signed-off-by: Mahesh Kumar <mahesh1.kumar@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 43 +++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 43 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 5804734d30a3..5ff0091707c0 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -152,6 +152,38 @@ 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_fixed_16_16(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_u32_fixed_16_16_round_up(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_fixed_16_16(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;
> @@ -174,6 +206,17 @@ static inline uint_fixed_16_16_t fixed_16_16_div_u64(uint32_t val, uint32_t d)
> return res;
> }
>
> +static inline uint32_t fixed_16_16_div_round_up_u64(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)
> {
I wouldn't mind if those macros would be moved later to drm core, I don't think i915 is the only one to benefit from fixed 16.16 calculations. :)
~Maarten
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