[Intel-gfx] [v2] drm/i915/display: Add a wrapper function for vga decode setup

[Uma Shankar]

Some of the VGA functionality is not needed by the proposed
Intel Xe driver, while this will be utilized by i915.
Adding a wrapper function for VGA decode setup.

v2: Addressed Jani Nikula's review comments.

Signed-off-by: Uma Shankar <uma.shankar at intel.com>
---
 drivers/gpu/drm/i915/display/intel_vga.c |  2 --
 drivers/gpu/drm/i915/soc/intel_gmch.c    | 14 ++++++++++++++
 drivers/gpu/drm/i915/soc/intel_gmch.h    |  2 ++
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_vga.c b/drivers/gpu/drm/i915/display/intel_vga.c
index 286a0bdd28c6..0f65ce115035 100644
--- a/drivers/gpu/drm/i915/display/intel_vga.c
+++ b/drivers/gpu/drm/i915/display/intel_vga.c
@@ -3,11 +3,9 @@
  * Copyright © 2019 Intel Corporation
  */
 
-#include <linux/pci.h>
 #include <linux/vgaarb.h>
 
 #include <video/vga.h>
-
 #include "soc/intel_gmch.h"
 
 #include "i915_drv.h"
diff --git a/drivers/gpu/drm/i915/soc/intel_gmch.c b/drivers/gpu/drm/i915/soc/intel_gmch.c
index 49c7fb16e934..f32e9f78770a 100644
--- a/drivers/gpu/drm/i915/soc/intel_gmch.c
+++ b/drivers/gpu/drm/i915/soc/intel_gmch.c
@@ -5,6 +5,7 @@
 
 #include <linux/pci.h>
 #include <linux/pnp.h>
+#include <linux/vgaarb.h>
 
 #include <drm/drm_managed.h>
 #include <drm/i915_drm.h>
@@ -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..23be2d113afd 100644
--- a/drivers/gpu/drm/i915/soc/intel_gmch.h
+++ b/drivers/gpu/drm/i915/soc/intel_gmch.h
@@ -8,11 +8,13 @@
 
 #include <linux/types.h>
 
+struct pci_dev;
 struct drm_i915_private;
 
 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