From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mathieu Malaterre Date: Wed, 31 Jan 2018 07:42:45 +0000 Subject: [PATCH v4] Fix loading of module radeonfb on PowerMac Message-Id: <20180131074245.7306-1-malat@debian.org> List-Id: References: <20171221220757.24672-1-malat@debian.org> In-Reply-To: <20171221220757.24672-1-malat@debian.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Bartlomiej Zolnierkiewicz Cc: Lennart Sorensen , Mathieu Malaterre , Benjamin Herrenschmidt , Tomi Valkeinen , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org When the linux kernel is build with (typical kernel ship with Debian installer): 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"). It should be noticed that `offb_destroy` is never called which explain the need to skip error detection on the radeon side. Signed-off-by: Mathieu Malaterre Link: https://bugs.debian.org/826629#57 Link: https://bugzilla.kernel.org/show_bug.cgi?id9741 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 drivers/video/fbdev/aty/radeon_base.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/drivers/video/fbdev/aty/radeon_base.c b/drivers/video/fbdev/aty/radeon_base.c index 4d77daeecf99..ae669f424537 100644 --- a/drivers/video/fbdev/aty/radeon_base.c +++ b/drivers/video/fbdev/aty/radeon_base.c @@ -70,6 +70,7 @@ #include #include #include +#include #include #include @@ -2259,6 +2260,23 @@ 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); + + drm_fb_helper_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) @@ -2312,19 +2330,27 @@ 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) { +#ifndef CONFIG_FB_OF printk( KERN_ERR "radeonfb (%s): cannot request region 0.\n", pci_name(rinfo->pdev)); goto err_release_fb; +#endif } ret = pci_request_region(pdev, 2, "radeonfb mmio"); if (ret < 0) { +#ifndef CONFIG_FB_OF printk( KERN_ERR "radeonfb (%s): cannot request region 2.\n", pci_name(rinfo->pdev)); goto err_release_pci0; +#endif } /* map the regions */ @@ -2509,10 +2535,12 @@ static int radeonfb_pci_register(struct pci_dev *pdev, iounmap(rinfo->mmio_base); err_release_pci2: pci_release_region(pdev, 2); +#ifndef CONFIG_FB_OF err_release_pci0: pci_release_region(pdev, 0); err_release_fb: framebuffer_release(info); +#endif err_disable: err_out: return ret; -- 2.11.0