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fbcon: Use screen info to find primary device 

On systems with non VGA GPUs fbcon can't find the primary GPU because
video_is_primary_device() only checks the VGA arbiter.

Add a screen info check to video_is_primary_device() so that callers
can get accurate data on such systems.

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Suggested-by: Thomas Zimmermann <tzimmermann@suse.de>
Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20250811162606.587759-4-superm1@kernel.org
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
This commit is contained in:
Mario Limonciello (AMD) 2025-08-11 11:26:05 -05:00
parent 337bf13aa9
commit ad90860bd1
1 changed files with 24 additions and 1 deletions
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25
arch/x86/video/video-common.c
View File

@ -9,6 +9,7 @@
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/screen_info.h>
#include <linux/vgaarb.h>
#include <asm/video.h>
@ -27,6 +28,11 @@ EXPORT_SYMBOL(pgprot_framebuffer);
bool video_is_primary_device(struct device *dev)
{
#ifdef CONFIG_SCREEN_INFO
struct screen_info *si = &screen_info;
struct resource res[SCREEN_INFO_MAX_RESOURCES];
ssize_t i, numres;
#endif
struct pci_dev *pdev;
if (!dev_is_pci(dev))
@ -34,7 +40,24 @@ bool video_is_primary_device(struct device *dev)
pdev = to_pci_dev(dev);
return (pdev == vga_default_device());
if (!pci_is_display(pdev))
return false;
if (pdev == vga_default_device())
return true;
#ifdef CONFIG_SCREEN_INFO
numres = screen_info_resources(si, res, ARRAY_SIZE(res));
for (i = 0; i < numres; ++i) {
if (!(res[i].flags & IORESOURCE_MEM))
continue;
if (pci_find_resource(pdev, &res[i]))
return true;
}
#endif
return false;
}
EXPORT_SYMBOL(video_is_primary_device);