From: Linus Walleij linus.walleij@linaro.org
[ Upstream commit b984b6d8b52372b98cce0a6ff6c2787f50665b87 ]
The following bug appeared in the MCDE driver/display initialization during the recent merge window.
First the place we call drm_fbdev_generic_setup() in the wrong place: this needs to be called AFTER calling drm_dev_register() else we get this splat:
------------[ cut here ]------------ WARNING: CPU: 0 PID: 1 at ../drivers/gpu/drm/drm_fb_helper.c:2198 drm_fbdev_generic_setup+0x164/0x1a8 mcde a0350000.mcde: Device has not been registered. Modules linked in: Hardware name: ST-Ericsson Ux5x0 platform (Device Tree Support) [<c010e704>] (unwind_backtrace) from [<c010a86c>] (show_stack+0x10/0x14) [<c010a86c>] (show_stack) from [<c0414f38>] (dump_stack+0x9c/0xb0) [<c0414f38>] (dump_stack) from [<c0121c8c>] (__warn+0xb8/0xd0) [<c0121c8c>] (__warn) from [<c0121d18>] (warn_slowpath_fmt+0x74/0xb8) [<c0121d18>] (warn_slowpath_fmt) from [<c04b154c>] (drm_fbdev_generic_setup+0x164/0x1a8) [<c04b154c>] (drm_fbdev_generic_setup) from [<c04ed278>] (mcde_drm_bind+0xc4/0x160) [<c04ed278>] (mcde_drm_bind) from [<c04f06b8>] (try_to_bring_up_master+0x15c/0x1a4) (...)
Signed-off-by: Linus Walleij linus.walleij@linaro.org Reviewed-by: Sam Ravnborg sam@ravnborg.org Link: https://patchwork.freedesktop.org/patch/msgid/20200613223027.4189309-1-linus... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/mcde/mcde_drv.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/mcde/mcde_drv.c b/drivers/gpu/drm/mcde/mcde_drv.c index 5649887d2b901..16e5fb9ec784d 100644 --- a/drivers/gpu/drm/mcde/mcde_drv.c +++ b/drivers/gpu/drm/mcde/mcde_drv.c @@ -215,7 +215,6 @@ static int mcde_modeset_init(struct drm_device *drm)
drm_mode_config_reset(drm); drm_kms_helper_poll_init(drm); - drm_fbdev_generic_setup(drm, 32);
return 0;
@@ -282,6 +281,8 @@ static int mcde_drm_bind(struct device *dev) if (ret < 0) goto unbind;
+ drm_fbdev_generic_setup(drm, 32); + return 0;
unbind: