openwrt/target/linux/bcm27xx/patches-6.6/950-0679-drm-fb-helper-Look-up-preferred-fbdev-node-number-fr.patch
Álvaro Fernández Rojas 8c405cdccc bcm27xx: add 6.6 kernel patches
The patches were generated from the RPi repo with the following command:
git format-patch v6.6.34..rpi-6.1.y

Some patches needed rebasing and, as usual, the applied and reverted, wireless
drivers, Github workflows, READMEs and defconfigs patches were removed.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
2024-06-18 18:52:49 +02:00

43 lines
1.3 KiB
Diff

From 35f881ca59d6f8bbf49889a792d3539d9bab6ed2 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Mon, 9 Oct 2023 16:34:36 +0100
Subject: [PATCH 0679/1085] 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 <dave.stevenson@raspberrypi.com>
---
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
@@ -1837,7 +1837,7 @@ __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;
@@ -1868,6 +1868,15 @@ __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;