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fbdev: add remove_conflicting_pci_framebuffers()

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Almost all PCI drivers using remove_conflicting_framebuffers() wrap it
with the same code.

v2: add kerneldoc for DRM helper
v3: propagate remove_conflicting_framebuffers() return value
  + move kerneldoc to where function is implemented

Signed-off-by: Michał Mirosław <[email protected]>
Acked-by: Bartlomiej Zolnierkiewicz <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/7db1c278276de420eb45a1b71d06b5eb6bbd49ef.1535810304.git.mirq-linux@rere.qmqm.pl
This commit is contained in:
Michał Mirosław 2018-09-01 16:08:45 +02:00 • committed by Daniel Vetter
commit 4d18975c78
3 changed files with 49 additions and 0 deletions
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35
drivers/video/fbdev/core/fbmem.c
View file

@ -34,6 +34,7 @@
#include <linux/fb.h>
#include <linux/fbcon.h>
#include <linux/mem_encrypt.h>
#include <linux/pci.h>
#include <asm/fb.h>
@ -1830,6 +1831,40 @@ int remove_conflicting_framebuffers(struct apertures_struct *a,
}
EXPORT_SYMBOL(remove_conflicting_framebuffers);
/**
* remove_conflicting_pci_framebuffers - remove firmware-configured framebuffers for PCI devices
* @pdev: PCI device
* @resource_id: index of PCI BAR configuring framebuffer memory
* @name: requesting driver name
*
* This function removes framebuffer devices (eg. initialized by firmware)
* using memory range configured for @pdev's BAR @resource_id.
*
* The function assumes that PCI device with shadowed ROM drives a primary
* display and so kicks out vga16fb.
*/
int remove_conflicting_pci_framebuffers(struct pci_dev *pdev, int res_id, const char *name)
{
struct apertures_struct *ap;
bool primary = false;
int err;
ap = alloc_apertures(1);
if (!ap)
return -ENOMEM;
ap->ranges[0].base = pci_resource_start(pdev, res_id);
ap->ranges[0].size = pci_resource_len(pdev, res_id);
#ifdef CONFIG_X86
primary = pdev->resource[PCI_ROM_RESOURCE].flags &
IORESOURCE_ROM_SHADOW;
#endif
err = remove_conflicting_framebuffers(ap, name, primary);
kfree(ap);
return err;
}
EXPORT_SYMBOL(remove_conflicting_pci_framebuffers);
/**
* register_framebuffer - registers a frame buffer device
* @fb_info: frame buffer info structure