When the linux kernel is build with (typical kernel ship with Debian
installer):
CONFIG_FB=y
CONFIG_FB_OF=y
CONFIG_VT_HW_CONSOLE_BINDING=y
CONFIG_FB_RADEON=m
The offb driver takes precedence over module radeonfb. It is then
impossible to load the module, error reported is:
[ 96.551486] radeonfb :00:10.0: enabling device (0006 -> 0007)
[ 96.551526] radeonfb :00:10.0: BAR 0: can't reserve [mem
0x9800-0x9fff pref]
[ 96.551531] radeonfb (:00:10.0): cannot request region 0.
[ 96.551545] radeonfb: probe of :00:10.0 failed with error -16
This patch reproduce the behavior of the module radeon, so as to make it
possible to load radeonfb when offb is first loaded, see
commit a56f7428d753 ("drm/radeon: Add early unregister of firmware fb's").
Signed-off-by: Mathieu Malaterre
Link: https://bugs.debian.org/826629#57
Link: https://bugzilla.kernel.org/show_bug.cgi?id=119741
Suggested-by: Lennart Sorensen
Cc: Bartlomiej Zolnierkiewicz
Cc: Benjamin Herrenschmidt
Cc: Tomi Valkeinen
---
v2: Only fails when CONFIG_PCC is not set
v3: Only fails when CONFIG_FB_OF is not set, CONFIG_PCC was too broad. Since
the conflicts in region is due to OFfb explicitly refers to it.
v4: Use drm_fb_helper_remove_conflicting_framebuffers from drm_fb_helper
v5: do not use drm_fb_helper_remove_conflicting_framebuffers from drm_fb_helper
remove ifdef hacks since not needed once framebuffer is properly decremented
drivers/video/fbdev/aty/radeon_base.c | 21 +
1 file changed, 21 insertions(+)
diff --git a/drivers/video/fbdev/aty/radeon_base.c
b/drivers/video/fbdev/aty/radeon_base.c
index 87608c0b2351..e8594bbaea60 100644
--- a/drivers/video/fbdev/aty/radeon_base.c
+++ b/drivers/video/fbdev/aty/radeon_base.c
@@ -2255,6 +2255,23 @@ static const struct bin_attribute edid2_attr = {
.read = radeon_show_edid2,
};
+static int radeon_kick_out_firmware_fb(struct pci_dev *pdev)
+{
+ struct apertures_struct *ap;
+
+ ap = alloc_apertures(1);
+ if (!ap)
+ return -ENOMEM;
+
+ ap->ranges[0].base = pci_resource_start(pdev, 0);
+ ap->ranges[0].size = pci_resource_len(pdev, 0);
+
+ remove_conflicting_framebuffers(ap, KBUILD_MODNAME, false);
+
+ kfree(ap);
+
+ return 0;
+}
static int radeonfb_pci_register(struct pci_dev *pdev,
const struct pci_device_id *ent)
@@ -2308,6 +2325,10 @@ static int radeonfb_pci_register(struct pci_dev *pdev,
rinfo->fb_base_phys = pci_resource_start (pdev, 0);
rinfo->mmio_base_phys = pci_resource_start (pdev, 2);
+ ret = radeon_kick_out_firmware_fb(pdev);
+ if (ret)
+ return ret;
+
/* request the mem regions */
ret = pci_request_region(pdev, 0, "radeonfb framebuffer");
if (ret < 0) {
--
2.11.0
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