Now that both xe and i915 store struct drm_device in drvdata, we can
trivially support struct device and struct pci_dev in
to_intel_display().

We do need to check for NULL drvdata before converting it into struct
intel_device pointer, though. Do it in __drm_device_to_intel_display().

v2: Add NULL check in __drm_device_to_intel_display() (Gustavo)

Reviewed-by: Gustavo Sousa <gustavo.so...@intel.com> # v1
Signed-off-by: Jani Nikula <jani.nik...@intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_types.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h 
b/drivers/gpu/drm/i915/display/intel_display_types.h
index ea6548ceab2f..976c85446603 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -2205,7 +2205,11 @@ to_intel_frontbuffer(struct drm_framebuffer *fb)
  * intel_display pointer.
  */
 #define __drm_device_to_intel_display(p) \
-       (&to_i915(p)->display)
+       ((p) ? &to_i915(p)->display : NULL)
+#define __device_to_intel_display(p)                           \
+       __drm_device_to_intel_display(dev_get_drvdata(p))
+#define __pci_dev_to_intel_display(p)                          \
+       __drm_device_to_intel_display(pci_get_drvdata(p))
 #define __intel_connector_to_intel_display(p)          \
        __drm_device_to_intel_display((p)->base.dev)
 #define __intel_crtc_to_intel_display(p)               \
@@ -2229,6 +2233,8 @@ to_intel_frontbuffer(struct drm_framebuffer *fb)
 #define to_intel_display(p)                            \
        _Generic(*p,                                    \
                 __assoc(drm_device, p),                \
+                __assoc(device, p),                    \
+                __assoc(pci_dev, p),                   \
                 __assoc(intel_connector, p),           \
                 __assoc(intel_crtc, p),                \
                 __assoc(intel_crtc_state, p),          \
-- 
2.39.2

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