git.openwrt.org Git - openwrt/staging/xback.git/blob

   1 From 35f881ca59d6f8bbf49889a792d3539d9bab6ed2 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Mon, 9 Oct 2023 16:34:36 +0100
   4 Subject: [PATCH 0679/1085] drm/fb-helper: Look up preferred fbdev node number
   5  from DT
   6
   7 For situations where there are multiple DRM cards in a system,
   8 add a query of DT for "drm_fb" designations for cards to set
   9 their preferred /dev/fbN designation.
  10
  11 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  12 ---
  13  drivers/gpu/drm/drm_fb_helper.c | 11 ++++++++++-
  14  1 file changed, 10 insertions(+), 1 deletion(-)
  15
  16 --- a/drivers/gpu/drm/drm_fb_helper.c
  17 +++ b/drivers/gpu/drm/drm_fb_helper.c
  18 @@ -1840,7 +1840,7 @@ __drm_fb_helper_initial_config_and_unloc
  19         struct drm_device *dev = fb_helper->dev;
  20         struct fb_info *info;
  21         unsigned int width, height;
  22 -       int ret;
  23 +       int ret, id;
  24
  25         width = dev->mode_config.max_width;
  26         height = dev->mode_config.max_height;
  27 @@ -1868,6 +1868,15 @@ __drm_fb_helper_initial_config_and_unloc
  28          * register the fbdev emulation instance in kernel_fb_helper_list. */
  29         mutex_unlock(&fb_helper->lock);
  30
  31 +       id = of_alias_get_highest_id("drm_fb");
  32 +       if (id >= 0)
  33 +               fb_set_lowest_dynamic_fb(id + 1);
  34 +
  35 +       id = of_alias_get_id(dev->dev->of_node, "drm_fb");
  36 +       if (id >= 0) {
  37 +               info->node = id;
  38 +               info->custom_fb_num = true;
  39 +       }
  40         ret = register_framebuffer(info);
  41         if (ret < 0)
  42                 return ret;