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