When picking a mode, first look for modes that have been specified
by the user on the kernel's command line. Only if that fails, use
the existing heuristic of picking a nearby mode from it's various
parameters.
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
drivers/gpu/drm/drm_client_modeset.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/gpu/drm/drm_client_modeset.c b/drivers/gpu/drm/drm_client_modeset.c
index e6346a67cd98..b777faa87f04 100644
--- a/drivers/gpu/drm/drm_client_modeset.c
+++ b/drivers/gpu/drm/drm_client_modeset.c
@@ -165,6 +165,17 @@ drm_connector_pick_cmdline_mode(struct drm_connector *connector)
struct drm_display_mode *mode;
bool prefer_non_interlace;
+ /*
+ * Find a user-defined mode. If the user gave us a valid
+ * mode on the kernel command line, it will show up in this
+ * list.
+ */
+
+ list_for_each_entry(mode, &connector->modes, head) {
+ if (mode->type & DRM_MODE_TYPE_USERDEF)
+ return mode;
+ }
+
cmdline_mode = &connector->cmdline_mode;
if (cmdline_mode->specified == false)
return NULL;
--
2.36.0
