compositor-drm: allow mode frequency selection
As an option, allow to specify a mode (from the configuration file) by
its refresh rate.
Example of valid syntax:
- "mode=1920x1080" Select a 1920x1080 mode, refresh rate undefined.
- "mode=1920x1080@60" Select the (or one of the) 1920x1080 60 Hz mode.
Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
diff --git a/libweston/compositor-drm.c b/libweston/compositor-drm.c
index ecc872e..c7f7f63 100644
--- a/libweston/compositor-drm.c
+++ b/libweston/compositor-drm.c
@@ -2210,9 +2210,12 @@
drmModeModeInfo drm_modeline;
int32_t width = 0;
int32_t height = 0;
+ uint32_t refresh = 0;
+ int n;
if (mode == WESTON_DRM_BACKEND_OUTPUT_PREFERRED && modeline) {
- if (sscanf(modeline, "%dx%d", &width, &height) != 2) {
+ n = sscanf(modeline, "%dx%d@%d", &width, &height, &refresh);
+ if (n != 2 && n != 3) {
width = -1;
if (parse_modeline(modeline, &drm_modeline) == 0) {
@@ -2228,7 +2231,8 @@
wl_list_for_each_reverse(drm_mode, &output->base.mode_list, base.link) {
if (width == drm_mode->base.width &&
- height == drm_mode->base.height)
+ height == drm_mode->base.height &&
+ (refresh == 0 || refresh == drm_mode->mode_info.vrefresh))
configured = drm_mode;
if (memcmp(current_mode, &drm_mode->mode_info,