diff options
| author | Christian König <christian.koenig@amd.com> | 2019-05-06 20:57:52 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-06-11 13:20:55 +0300 |
| commit | 84c82ab8f133f1c1e27f6b1bafe3f7d8835acc4c (patch) | |
| tree | f5bc5ac79ee19109f5ce46a0b375a88f3d32848e | |
| parent | 748a97ec6c1588e3a49e09fe9ca56dcdb7f976b5 (diff) | |
| download | linux-84c82ab8f133f1c1e27f6b1bafe3f7d8835acc4c.tar.xz | |
drm/radeon: prefer lower reference dividers
commit 2e26ccb119bde03584be53406bbd22e711b0d6e6 upstream.
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 <dufresnep@gmail.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_display.c | 4 |
1 files 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; } } |