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Subject[PATCHv2] drm: fb_helper: prefer to use mode, which is not DRM_MODE_TYPE_USERDEF
Date
commit eaf99c749d43 ("drm: Perform cmdline mode parsing during connector
initialisation") breaks HDMI output on BeagleBone Black with LG TV
(model 19LS4R-ZA) when "video=HDMI-A-1:1280x720@60" is specified on
the command line.

The reason is newly added mode
'"1280x720" 60 74440 1280 1336 1472 1664 720 721 724 746 0x20 0x6'
, which is added by function drm_helper_probe_add_cmdline_mode (introduced
in above mentioned commit). This mode causes TV to go black and show "No
signal" message.

When cmdline_mode is set, it is preferred to use matching mode obtained
from EDID, than mode calculated by function
drm_mode_create_from_cmdline_mode

Signed-off-by: Radek Dostal <rd@radekdostal.com>
---
v2: fixed if (prefer_non_userdef) condition, which was causing infinite
loop before.

drivers/gpu/drm/drm_fb_helper.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index cac4229..fac425e 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -1284,6 +1284,7 @@ struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *f
{
struct drm_cmdline_mode *cmdline_mode;
struct drm_display_mode *mode;
+ bool prefer_non_userdef;
bool prefer_non_interlace;

cmdline_mode = &fb_helper_conn->connector->cmdline_mode;
@@ -1296,6 +1297,7 @@ struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *f
if (cmdline_mode->rb || cmdline_mode->margins)
goto create_mode;

+ prefer_non_userdef = true;
prefer_non_interlace = !cmdline_mode->interlace;
again:
list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) {
@@ -1312,6 +1314,9 @@ again:
if (cmdline_mode->interlace) {
if (!(mode->flags & DRM_MODE_FLAG_INTERLACE))
continue;
+ } else if (prefer_non_userdef) {
+ if (mode->type & DRM_MODE_TYPE_USERDEF)
+ continue;
} else if (prefer_non_interlace) {
if (mode->flags & DRM_MODE_FLAG_INTERLACE)
continue;
@@ -1319,6 +1324,11 @@ again:
return mode;
}

+ if (prefer_non_userdef) {
+ prefer_non_userdef = false;
+ goto again;
+ }
+
if (prefer_non_interlace) {
prefer_non_interlace = false;
goto again;
--
1.7.9.5


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