drm/dp/mst: Replace the fixed point thing with straight calculation

#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>

 */

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

	 * 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);