diff options
Diffstat (limited to 'meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/1905-drm-radeon-prefer-lower-reference-dividers.patch')
| -rw-r--r-- | meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/1905-drm-radeon-prefer-lower-reference-dividers.patch | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/1905-drm-radeon-prefer-lower-reference-dividers.patch b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/1905-drm-radeon-prefer-lower-reference-dividers.patch new file mode 100644 index 00000000..d795d2ef --- /dev/null +++ b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/1905-drm-radeon-prefer-lower-reference-dividers.patch @@ -0,0 +1,41 @@ +From 24142cb727f054b52a70853163e4e6d7c57c15e3 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com> +Date: Mon, 6 May 2019 19:57:52 +0200 +Subject: [PATCH 1905/2940] drm/radeon: prefer lower reference dividers +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +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> +--- + 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 + |