From: Sui Jingfeng <suijingf...@loongson.cn>
On a machine with multiple GPUs, a Linux user has no control over which one
is primary at boot time. This patch tries to solve the mentioned problem by
implementing the .be_primary() callback. Pass i915.modeset=10 on the kernel
cmd line if you really want the device bound by i915 drm driver to be the
primary video adapter, no matter what VGAARB say.
Cc: Jani Nikula <jani.nik...@linux.intel.com>
Cc: David Airlie <airl...@gmail.com>
Cc: Daniel Vetter <dan...@ffwll.ch>
Signed-off-by: Sui Jingfeng <suijingf...@loongson.cn>
---
drivers/gpu/drm/i915/display/intel_vga.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_vga.c
b/drivers/gpu/drm/i915/display/intel_vga.c
index 98d7d4dffe9f..e3f78ba2668b 100644
--- a/drivers/gpu/drm/i915/display/intel_vga.c
+++ b/drivers/gpu/drm/i915/display/intel_vga.c
@@ -113,6 +113,17 @@ intel_vga_set_decode(struct pci_dev *pdev, bool
enable_decode)
return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
}
+static bool intel_want_to_be_primary(struct pci_dev *pdev)
+{
+ struct drm_i915_private *i915 = pdev_to_i915(pdev);
+ struct i915_params *params = &i915->params;
+
+ if (params->modeset == 10)
+ return true;
+
+ return false;
+}
+
int intel_vga_register(struct drm_i915_private *i915)
{
struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
@@ -126,7 +137,8 @@ int intel_vga_register(struct drm_i915_private *i915)
* then we do not take part in VGA arbitration and the
* vga_client_register() fails with -ENODEV.
*/
- ret = vga_client_register(pdev, intel_vga_set_decode, NULL);
+ ret = vga_client_register(pdev, intel_vga_set_decode,
+ intel_want_to_be_primary);
if (ret && ret != -ENODEV)
return ret;
--
2.34.1
