From 069ee21a8234459473b238e65701d2e79c194ec7 Mon Sep 17 00:00:00 2001 From: Mathieu Malaterre Date: Mon, 12 Mar 2018 17:06:54 +0100 Subject: [PATCH] fbdev: Fix loading of module radeonfb on PowerMac 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 0000:00:10.0: enabling device (0006 -> 0007) [ 96.551526] radeonfb 0000:00:10.0: BAR 0: can't reserve [mem 0x98000000-0x9fffffff pref] [ 96.551531] radeonfb (0000:00:10.0): cannot request region 0. [ 96.551545] radeonfb: probe of 0000:00:10.0 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: Benjamin Herrenschmidt Cc: Tomi Valkeinen Signed-off-by: Bartlomiej Zolnierkiewicz --- 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