From 1216ea56c2e30aee4975b4dcce79ebd199afaf8f Mon Sep 17 00:00:00 2001 From: Dave Stevenson Date: Mon, 9 Oct 2023 16:34:36 +0100 Subject: [PATCH] drm/fb-helper: Look up preferred fbdev node number from DT For situations where there are multiple DRM cards in a system, add a query of DT for "drm_fb" designations for cards to set their preferred /dev/fbN designation. Signed-off-by: Dave Stevenson --- drivers/gpu/drm/drm_fb_helper.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -1932,7 +1932,7 @@ __drm_fb_helper_initial_config_and_unloc struct drm_device *dev = fb_helper->dev; struct fb_info *info; unsigned int width, height; - int ret; + int ret, id; width = dev->mode_config.max_width; height = dev->mode_config.max_height; @@ -1967,6 +1967,15 @@ __drm_fb_helper_initial_config_and_unloc * register the fbdev emulation instance in kernel_fb_helper_list. */ mutex_unlock(&fb_helper->lock); + id = of_alias_get_highest_id("drm_fb"); + if (id >= 0) + fb_set_lowest_dynamic_fb(id + 1); + + id = of_alias_get_id(dev->dev->of_node, "drm_fb"); + if (id >= 0) { + info->node = id; + info->custom_fb_num = true; + } ret = register_framebuffer(info); if (ret < 0) return ret;