[PATCH] drm: panel: simple-panel: set appropriate mode type

[Boris Brezillon]

All modes exposed by simple panels should be tagged as driver defined
modes.
Moreover, if a panel supports only one mode, this mode is obviously the
preferred one.

Doing this also fix a problem occurring when a 'video=' parameter is passed
on the kernel cmdline. In some cases the user provided mode is preferred
over the simple panel ones, which might result in unpredictable behavior.

Signed-off-by: Boris Brezillon <boris.brezillon at free-electrons.com>
---
 drivers/gpu/drm/panel/panel-simple.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index d14b904..95ae390 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -111,6 +111,10 @@ static int panel_simple_get_fixed_modes(struct panel_simple *panel)
 			continue;
 		}
 
+		mode->type |= DRM_MODE_TYPE_DRIVER;
+		if (panel->desc->num_modes == 1)
+			mode->type |= DRM_MODE_TYPE_PREFERRED;
+
 		drm_display_mode_from_videomode(&vm, mode);
 
 		drm_mode_probed_add(connector, mode);
@@ -127,6 +131,10 @@ static int panel_simple_get_fixed_modes(struct panel_simple *panel)
 			continue;
 		}
 
+		mode->type |= DRM_MODE_TYPE_DRIVER;
+		if (panel->desc->num_modes == 1)
+			mode->type |= DRM_MODE_TYPE_PREFERRED;
+
 		drm_mode_set_name(mode);
 
 		drm_mode_probed_add(connector, mode);
-- 
1.9.1