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authorMichał Mirosław <mirq-linux@rere.qmqm.pl>2018-09-01 16:08:45 +0200
committerDaniel Vetter <daniel.vetter@ffwll.ch>2018-09-03 18:15:40 +0200
commit4d18975c78f2d5c91792356501cf369e67594241 (patch)
tree0952c365316ede5770f30afa8b5b808e7a0f6ae8 /drivers/video
parent69aa5355ab0da7a73ef95aff647a054590e48416 (diff)
downloadlinux-4d18975c78f2d5c91792356501cf369e67594241.tar.bz2
fbdev: add remove_conflicting_pci_framebuffers()
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 <mirq-linux@rere.qmqm.pl> Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/7db1c278276de420eb45a1b71d06b5eb6bbd49ef.1535810304.git.mirq-linux@rere.qmqm.pl
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/fbdev/core/fbmem.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 6e9961b71442..5ffadc8e681d 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -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>
@@ -1831,6 +1832,40 @@ 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
*