[Intel-xe] [PATCH 1/3] drm/i915/display: Add a wrapper function for vga decode setup

[Uma Shankar <uma.shankar@intel.com>]

Some of the VGA functionality is not needed by the proposed
Intel Xe driver. Adding a wrapper function for VGA decode setup.

Signed-off-by: Uma Shankar <uma.shankar@intel.com>
---
 drivers/gpu/drm/i915/soc/intel_gmch.c | 14 ++++++++++++++
 drivers/gpu/drm/i915/soc/intel_gmch.h |  1 +
 2 files changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/i915/soc/intel_gmch.c b/drivers/gpu/drm/i915/soc/intel_gmch.c
index 49c7fb16e934..818f0b7f62a2 100644
--- a/drivers/gpu/drm/i915/soc/intel_gmch.c
+++ b/drivers/gpu/drm/i915/soc/intel_gmch.c
@@ -12,6 +12,7 @@
 #include "i915_drv.h"
 #include "intel_gmch.h"
 #include "intel_pci_config.h"
+#include <linux/vgaarb.h>
 
 static void intel_gmch_bridge_release(struct drm_device *dev, void *bridge)
 {
@@ -167,3 +168,16 @@ int intel_gmch_vga_set_state(struct drm_i915_private *i915, bool enable_decode)
 
 	return 0;
 }
+
+unsigned int intel_gmch_vga_set_decode(struct pci_dev *pdev, bool enable_decode)
+{
+	struct drm_i915_private *i915 = pdev_to_i915(pdev);
+
+	intel_gmch_vga_set_state(i915, enable_decode);
+
+	if (enable_decode)
+		return VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM |
+		       VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
+	else
+		return VGA_RSRC_NORMAL_IO | VGA_RSRC_NORMAL_MEM;
+}
diff --git a/drivers/gpu/drm/i915/soc/intel_gmch.h b/drivers/gpu/drm/i915/soc/intel_gmch.h
index d0133eedc720..88db1653ffc9 100644
--- a/drivers/gpu/drm/i915/soc/intel_gmch.h
+++ b/drivers/gpu/drm/i915/soc/intel_gmch.h
@@ -14,5 +14,6 @@ int intel_gmch_bridge_setup(struct drm_i915_private *i915);
 void intel_gmch_bar_setup(struct drm_i915_private *i915);
 void intel_gmch_bar_teardown(struct drm_i915_private *i915);
 int intel_gmch_vga_set_state(struct drm_i915_private *i915, bool enable_decode);
+unsigned int intel_gmch_vga_set_decode(struct pci_dev *pdev, bool enable_decode);
 
 #endif /* __INTEL_GMCH_H__ */
-- 
2.42.0