Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
Cc: Mikita Lipski - figured you'd want to know ahead of time you'll need to
update your changes to drm_dp_calc_pbn_mode() to match
On Wed, 2019-09-25 at 17:14 +0300, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> Get rid of the drm_fixp_from_fraction() usage and just do the
> straightforward calculation directly.
>
> Cc: Lyude Paul <lyude@xxxxxxxxxx>
> Cc: Harry Wentland <harry.wentland@xxxxxxx>
> Cc: Alex Deucher <alexander.deucher@xxxxxxx>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/drm_dp_mst_topology.c | 18 ++----------------
> 1 file changed, 2 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c
> b/drivers/gpu/drm/drm_dp_mst_topology.c
> index d4644a3c1324..f899a4432311 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -32,7 +32,6 @@
> #include <drm/drm_atomic_helper.h>
> #include <drm/drm_dp_mst_helper.h>
> #include <drm/drm_drv.h>
> -#include <drm/drm_fixed.h>
> #include <drm/drm_print.h>
> #include <drm/drm_probe_helper.h>
>
> @@ -3840,13 +3839,6 @@ EXPORT_SYMBOL(drm_dp_check_act_status);
> */
> int drm_dp_calc_pbn_mode(int clock, int bpp)
> {
> - u64 kbps;
> - s64 peak_kbps;
> - u32 numerator;
> - u32 denominator;
> -
> - kbps = clock * bpp;
> -
> /*
> * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006
> * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on
> @@ -3857,14 +3849,8 @@ int drm_dp_calc_pbn_mode(int clock, int bpp)
> * peak_kbps *= (64/54)
> * peak_kbps *= 8 convert to bytes
> */
> -
> - numerator = 64 * 1006;
> - denominator = 54 * 8 * 1000 * 1000;
> -
> - kbps *= numerator;
> - peak_kbps = drm_fixp_from_fraction(kbps, denominator);
> -
> - return drm_fixp2int_ceil(peak_kbps);
> + return DIV_ROUND_UP_ULL(mul_u32_u32(clock * bpp, 64 * 1006),
> + 8 * 54 * 1000 * 1000);
> }
> EXPORT_SYMBOL(drm_dp_calc_pbn_mode);
>
--
Cheers,
Lyude Paul
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