Acked-by: Alex Deucher <alexander.deuc...@amd.com> ________________________________ From: amd-gfx <amd-gfx-boun...@lists.freedesktop.org> on behalf of Christian König <ckoenig.leichtzumer...@gmail.com> Sent: Monday, May 6, 2019 2:01 PM To: amd-gfx@lists.freedesktop.org; dufres...@gmail.com; werner.luec...@googlemail.com Subject: [PATCH] drm/radeon: prefer lower reference dividers
[CAUTION: External Email] Instead of the closest reference divider prefer the lowest, this fixes flickering issues on HP Compaq nx9420. Bugs: https://bugs.freedesktop.org/show_bug.cgi?id=108514 Suggested-by: Paul Dufresne <dufres...@gmail.com> Signed-off-by: Christian König <christian.koe...@amd.com> --- drivers/gpu/drm/radeon/radeon_display.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c index 9d3ac8b981da..d8e2d7b3b836 100644 --- a/drivers/gpu/drm/radeon/radeon_display.c +++ b/drivers/gpu/drm/radeon/radeon_display.c @@ -921,12 +921,12 @@ static void avivo_get_fb_ref_div(unsigned nom, unsigned den, unsigned post_div, ref_div_max = max(min(100 / post_div, ref_div_max), 1u); /* get matching reference and feedback divider */ - *ref_div = min(max(DIV_ROUND_CLOSEST(den, post_div), 1u), ref_div_max); + *ref_div = min(max(den/post_div, 1u), ref_div_max); *fb_div = DIV_ROUND_CLOSEST(nom * *ref_div * post_div, den); /* limit fb divider to its maximum */ if (*fb_div > fb_div_max) { - *ref_div = DIV_ROUND_CLOSEST(*ref_div * fb_div_max, *fb_div); + *ref_div = (*ref_div * fb_div_max)/(*fb_div); *fb_div = fb_div_max; } } -- 2.17.1 _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx
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