[PATCH 2/2] gpu/drm: ingenic: Add workaround for disabled drivers
From: Paul Cercueil <paul@crapouillou.net>
Date: 2021-08-05 19:21:34
Also in:
dri-devel, lkml
Subsystem:
drm drivers, drm drivers and misc gpu patches, ingenic jz47xx socs, the rest · Maintainers:
David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Paul Cercueil, Linus Torvalds
When the drivers of remote devices (e.g. HDMI chip) are disabled in the config, we want the ingenic-drm driver to be able to probe nonetheless with the other devices (e.g. internal LCD panel) that are enabled. Signed-off-by: Paul Cercueil <paul@crapouillou.net> --- drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
index d261f7a03b18..5e1fdbb0ba6b 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c@@ -1058,6 +1058,18 @@ static int ingenic_drm_bind(struct device *dev, bool has_components) for (i = 0; ; i++) { ret = drm_of_find_panel_or_bridge(dev->of_node, 0, i, &panel, &bridge); if (ret) { + /* + * Workaround for the case where the drivers for the + * remote devices are not enabled. When that happens, + * drm_of_find_panel_or_bridge() returns -EPROBE_DEFER + * endlessly, which prevents the ingenic-drm driver from + * working at all. + */ + if (ret == -EPROBE_DEFER) { + ret = driver_deferred_probe_check_state(dev); + if (ret == -ENODEV || ret == -ETIMEDOUT) + continue; + } if (ret == -ENODEV) break; /* we're done */ if (ret != -EPROBE_DEFER)
--
2.30.2