drm/radeon: Defer probe if gmux is present but its driver isn't
gmux is a microcontroller built into dual GPU MacBook Pros. On pre-retina MBPs, if we're the inactive GPU, we need apple-gmux to temporarily switch DDC so that we can probe the panel's EDID. The checks for CONFIG_VGA_ARB and CONFIG_VGA_SWITCHEROO are necessary because if either of them is disabled but gmux is present, the driver would never load, even if we're the active GPU. (vga_default_device() would evaluate to NULL and vga_switcheroo_handler_flags() would evaluate to 0.) Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=61115 Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/552da6d85a82092146af7b0693595fa2a9ea376b.1452525860.git.lukas@wunner.de
This commit is contained in:
Родитель
98b3a3402e
Коммит
14d2000182
|
@ -34,9 +34,11 @@
|
|||
#include "radeon_drv.h"
|
||||
|
||||
#include <drm/drm_pciids.h>
|
||||
#include <linux/apple-gmux.h>
|
||||
#include <linux/console.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/pm_runtime.h>
|
||||
#include <linux/vgaarb.h>
|
||||
#include <linux/vga_switcheroo.h>
|
||||
#include <drm/drm_gem.h>
|
||||
|
||||
|
@ -319,6 +321,15 @@ static int radeon_pci_probe(struct pci_dev *pdev,
|
|||
{
|
||||
int ret;
|
||||
|
||||
/*
|
||||
* apple-gmux is needed on dual GPU MacBook Pro
|
||||
* to probe the panel if we're the inactive GPU.
|
||||
*/
|
||||
if (IS_ENABLED(CONFIG_VGA_ARB) && IS_ENABLED(CONFIG_VGA_SWITCHEROO) &&
|
||||
apple_gmux_present() && pdev != vga_default_device() &&
|
||||
!vga_switcheroo_handler_flags())
|
||||
return -EPROBE_DEFER;
|
||||
|
||||
/* Get rid of things like offb */
|
||||
ret = radeon_kick_out_firmware_fb(pdev);
|
||||
if (ret)
|
||||
|
|
Загрузка…
Ссылка в новой задаче