drm/i915: support struct device and pci_dev in to_intel_display()

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.sousa@intel.com> # v1
Link: https://patchwork.freedesktop.org/patch/msgid/f025a3fa4422725c78baac4501ad3ecc9e5b40d5.1724942754.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

Author: jnikula

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_atomic_state_to_intel_display(p)	\
 	__drm_device_to_intel_display((p)->base.dev)
 #define __intel_connector_to_intel_display(p)		\
@@ -2231,6 +2235,8 @@ 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_atomic_state, p),	\
 		 __assoc(intel_connector, p),		\
 		 __assoc(intel_crtc, p),		\