[Intel-gfx] [PATCH 02/14] drm/i915: Use DIV_ROUND_CLOSEST()

[Mika Kuoppala]

ville.syrjala at linux.intel.com writes:

> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> vlv_find_best_dpll() has an open coded DIV_ROUND_CLOSEST(). Replace it
> with the real thing.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index fca56fc..4b1af94 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -696,8 +696,7 @@ vlv_find_best_dpll(const intel_limit_t *limit, struct drm_crtc *crtc,
>  				p = p1 * p2;
>  				/* based on hardware requirement, prefer bigger m1,m2 values */
>  				for (m1 = limit->m1.min; m1 <= limit->m1.max; m1++) {
> -					m2 = (((2*(fastclk * p * n / m1 )) +
> -					       refclk) / (2*refclk));
> +					m2 = DIV_ROUND_CLOSEST(fastclk * p * n, refclk * m1);
>  					m = m1 * m2;
>  					vco = updrate * m;
>  
> -- 
> 1.8.1.5

Not a problem with this patch but perhaps consideration for further
cleanups: target and refclk should be u32 and further down the line
the crtc_config.clock and xxx_get_refclk() also.

Reviewed-by: Mika Kuoppala <mika.kuoppala at intel.com>