drm/i915: Convert INTEL_INFO()->display to a pointer

Rather than embeddeding the display's device info within the main device
info structure, just provide a pointer to the display-specific
structure.  This is in preparation for moving the display device info
definitions into the display code itself and for eventually allowing the
pointer to be assigned at runtime on platforms that use GMD_ID for
device identification.

In the future, this will also eventually allow the same display device
info structures to be used outside the current i915 code (e.g., from the
Xe driver).

v2:
 - Move introduction of DISPLAY_INFO() to this patch.  (Andrzej)
v3:
 - Also use DISPLAY_INFO() in intel_display_reg_defs.h.  (Andrzej)
 - Use "{}" instead of "{ 0 }" for empty struct init.  (Jani)
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Acked-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230523195609.73627-3-matthew.d.roper@intel.com

drivers/gpu/drm/i915/display/intel_color.c

@@ -1824,14 +1824,14 @@ static u32 intel_gamma_lut_tests(const struct intel_crtc_state *crtc_state)
 	if (lut_is_legacy(gamma_lut))
 		return 0;
 
-	return INTEL_INFO(i915)->display.color.gamma_lut_tests;
+	return DISPLAY_INFO(i915)->color.gamma_lut_tests;
 }
 
 static u32 intel_degamma_lut_tests(const struct intel_crtc_state *crtc_state)
 {
 	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
 
-	return INTEL_INFO(i915)->display.color.degamma_lut_tests;
+	return DISPLAY_INFO(i915)->color.degamma_lut_tests;
 }
 
 static int intel_gamma_lut_size(const struct intel_crtc_state *crtc_state)
@@ -1842,14 +1842,14 @@ static int intel_gamma_lut_size(const struct intel_crtc_state *crtc_state)
 	if (lut_is_legacy(gamma_lut))
 		return LEGACY_LUT_LENGTH;
 
-	return INTEL_INFO(i915)->display.color.gamma_lut_size;
+	return DISPLAY_INFO(i915)->color.gamma_lut_size;
 }
 
 static u32 intel_degamma_lut_size(const struct intel_crtc_state *crtc_state)
 {
 	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
 
-	return INTEL_INFO(i915)->display.color.degamma_lut_size;
+	return DISPLAY_INFO(i915)->color.degamma_lut_size;
 }
 
 static int check_lut_size(const struct drm_property_blob *lut, int expected)
@@ -2321,7 +2321,7 @@ static int glk_assign_luts(struct intel_crtc_state *crtc_state)
 		struct drm_property_blob *gamma_lut;
 
 		gamma_lut = create_resized_lut(i915, crtc_state->hw.gamma_lut,
-					       INTEL_INFO(i915)->display.color.degamma_lut_size,
+					       DISPLAY_INFO(i915)->color.degamma_lut_size,
 					       false);
 		if (IS_ERR(gamma_lut))
 			return PTR_ERR(gamma_lut);
@@ -2855,7 +2855,7 @@ static struct drm_property_blob *i9xx_read_lut_8(struct intel_crtc *crtc)
 static struct drm_property_blob *i9xx_read_lut_10(struct intel_crtc *crtc)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
-	u32 lut_size = INTEL_INFO(dev_priv)->display.color.gamma_lut_size;
+	u32 lut_size = DISPLAY_INFO(dev_priv)->color.gamma_lut_size;
 	enum pipe pipe = crtc->pipe;
 	struct drm_property_blob *blob;
 	struct drm_color_lut *lut;
@@ -2904,7 +2904,7 @@ static void i9xx_read_luts(struct intel_crtc_state *crtc_state)
 static struct drm_property_blob *i965_read_lut_10p6(struct intel_crtc *crtc)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
-	int i, lut_size = INTEL_INFO(dev_priv)->display.color.gamma_lut_size;
+	int i, lut_size = DISPLAY_INFO(dev_priv)->color.gamma_lut_size;
 	enum pipe pipe = crtc->pipe;
 	struct drm_property_blob *blob;
 	struct drm_color_lut *lut;
@@ -2954,7 +2954,7 @@ static void i965_read_luts(struct intel_crtc_state *crtc_state)
 static struct drm_property_blob *chv_read_cgm_degamma(struct intel_crtc *crtc)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
-	int i, lut_size = INTEL_INFO(dev_priv)->display.color.degamma_lut_size;
+	int i, lut_size = DISPLAY_INFO(dev_priv)->color.degamma_lut_size;
 	enum pipe pipe = crtc->pipe;
 	struct drm_property_blob *blob;
 	struct drm_color_lut *lut;
@@ -2980,7 +2980,7 @@ static struct drm_property_blob *chv_read_cgm_degamma(struct intel_crtc *crtc)
 static struct drm_property_blob *chv_read_cgm_gamma(struct intel_crtc *crtc)
 {
 	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
-	int i, lut_size = INTEL_INFO(i915)->display.color.gamma_lut_size;
+	int i, lut_size = DISPLAY_INFO(i915)->color.gamma_lut_size;
 	enum pipe pipe = crtc->pipe;
 	struct drm_property_blob *blob;
 	struct drm_color_lut *lut;
@@ -3044,7 +3044,7 @@ static struct drm_property_blob *ilk_read_lut_8(struct intel_crtc *crtc)
 static struct drm_property_blob *ilk_read_lut_10(struct intel_crtc *crtc)
 {
 	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
-	int i, lut_size = INTEL_INFO(i915)->display.color.gamma_lut_size;
+	int i, lut_size = DISPLAY_INFO(i915)->color.gamma_lut_size;
 	enum pipe pipe = crtc->pipe;
 	struct drm_property_blob *blob;
 	struct drm_color_lut *lut;
@@ -3228,7 +3228,7 @@ static void bdw_read_luts(struct intel_crtc_state *crtc_state)
 static struct drm_property_blob *glk_read_degamma_lut(struct intel_crtc *crtc)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
-	int i, lut_size = INTEL_INFO(dev_priv)->display.color.degamma_lut_size;
+	int i, lut_size = DISPLAY_INFO(dev_priv)->color.degamma_lut_size;
 	enum pipe pipe = crtc->pipe;
 	struct drm_property_blob *blob;
 	struct drm_color_lut *lut;
@@ -3293,7 +3293,7 @@ static struct drm_property_blob *
 icl_read_lut_multi_segment(struct intel_crtc *crtc)
 {
 	struct drm_i915_private *i915 = to_i915(crtc->base.dev);
-	int i, lut_size = INTEL_INFO(i915)->display.color.gamma_lut_size;
+	int i, lut_size = DISPLAY_INFO(i915)->color.gamma_lut_size;
 	enum pipe pipe = crtc->pipe;
 	struct drm_property_blob *blob;
 	struct drm_color_lut *lut;
@@ -3471,8 +3471,8 @@ void intel_color_crtc_init(struct intel_crtc *crtc)
 
 	drm_mode_crtc_set_gamma_size(&crtc->base, 256);
 
-	gamma_lut_size = INTEL_INFO(i915)->display.color.gamma_lut_size;
-	degamma_lut_size = INTEL_INFO(i915)->display.color.degamma_lut_size;
+	gamma_lut_size = DISPLAY_INFO(i915)->color.gamma_lut_size;
+	degamma_lut_size = DISPLAY_INFO(i915)->color.degamma_lut_size;
 	has_ctm = degamma_lut_size != 0;
 
 	/*
@@ -3497,7 +3497,8 @@ int intel_color_init(struct drm_i915_private *i915)
 	if (DISPLAY_VER(i915) != 10)
 		return 0;
 
-	blob = create_linear_lut(i915, INTEL_INFO(i915)->display.color.degamma_lut_size);
+	blob = create_linear_lut(i915,
+				 DISPLAY_INFO(i915)->color.degamma_lut_size);
 	if (IS_ERR(blob))
 		return PTR_ERR(blob);
 

drivers/gpu/drm/i915/display/intel_cursor.c

@@ -36,7 +36,7 @@ static u32 intel_cursor_base(const struct intel_plane_state *plane_state)
 	const struct drm_i915_gem_object *obj = intel_fb_obj(fb);
 	u32 base;
 
-	if (INTEL_INFO(dev_priv)->display.cursor_needs_physical)
+	if (DISPLAY_INFO(dev_priv)->cursor_needs_physical)
 		base = sg_dma_address(obj->mm.pages->sgl);
 	else
 		base = intel_plane_ggtt_offset(plane_state);

drivers/gpu/drm/i915/display/intel_display.h

@@ -113,7 +113,7 @@ enum i9xx_plane_id {
 
 #define for_each_dbuf_slice(__dev_priv, __slice) \
 	for ((__slice) = DBUF_S1; (__slice) < I915_MAX_DBUF_SLICES; (__slice)++) \
-		for_each_if(INTEL_INFO(__dev_priv)->display.dbuf.slice_mask & BIT(__slice))
+		for_each_if(INTEL_INFO(__dev_priv)->display->dbuf.slice_mask & BIT(__slice))
 
 #define for_each_dbuf_slice_in_mask(__dev_priv, __slice, __mask) \
 	for_each_dbuf_slice((__dev_priv), (__slice)) \

drivers/gpu/drm/i915/display/intel_display_power.c

@@ -1053,7 +1053,7 @@ void gen9_dbuf_slices_update(struct drm_i915_private *dev_priv,
 			     u8 req_slices)
 {
 	struct i915_power_domains *power_domains = &dev_priv->display.power.domains;
-	u8 slice_mask = INTEL_INFO(dev_priv)->display.dbuf.slice_mask;
+	u8 slice_mask = DISPLAY_INFO(dev_priv)->dbuf.slice_mask;
 	enum dbuf_slice slice;
 
 	drm_WARN(&dev_priv->drm, req_slices & ~slice_mask,
@@ -1113,7 +1113,7 @@ static void gen12_dbuf_slices_config(struct drm_i915_private *dev_priv)
 
 static void icl_mbus_init(struct drm_i915_private *dev_priv)
 {
-	unsigned long abox_regs = INTEL_INFO(dev_priv)->display.abox_mask;
+	unsigned long abox_regs = DISPLAY_INFO(dev_priv)->abox_mask;
 	u32 mask, val, i;
 
 	if (IS_ALDERLAKE_P(dev_priv) || DISPLAY_VER(dev_priv) >= 14)
@@ -1568,7 +1568,7 @@ static void tgl_bw_buddy_init(struct drm_i915_private *dev_priv)
 	enum intel_dram_type type = dev_priv->dram_info.type;
 	u8 num_channels = dev_priv->dram_info.num_channels;
 	const struct buddy_page_mask *table;
-	unsigned long abox_mask = INTEL_INFO(dev_priv)->display.abox_mask;
+	unsigned long abox_mask = DISPLAY_INFO(dev_priv)->abox_mask;
 	int config, i;
 
 	/* BW_BUDDY registers are not used on dgpu's beyond DG1 */

drivers/gpu/drm/i915/display/intel_display_reg_defs.h

@@ -8,7 +8,7 @@
 
 #include "i915_reg_defs.h"
 
-#define DISPLAY_MMIO_BASE(dev_priv)	(INTEL_INFO(dev_priv)->display.mmio_offset)
+#define DISPLAY_MMIO_BASE(dev_priv)	(DISPLAY_INFO(dev_priv)->mmio_offset)
 
 #define VLV_DISPLAY_BASE		0x180000
 
@@ -36,14 +36,14 @@
  * Device info offset array based helpers for groups of registers with unevenly
  * spaced base offsets.
  */
-#define _MMIO_PIPE2(pipe, reg)		_MMIO(INTEL_INFO(dev_priv)->display.pipe_offsets[(pipe)] - \
-					      INTEL_INFO(dev_priv)->display.pipe_offsets[PIPE_A] + \
+#define _MMIO_PIPE2(pipe, reg)		_MMIO(DISPLAY_INFO(dev_priv)->pipe_offsets[(pipe)] - \
+					      DISPLAY_INFO(dev_priv)->pipe_offsets[PIPE_A] + \
 					      DISPLAY_MMIO_BASE(dev_priv) + (reg))
-#define _MMIO_TRANS2(tran, reg)		_MMIO(INTEL_INFO(dev_priv)->display.trans_offsets[(tran)] - \
-					      INTEL_INFO(dev_priv)->display.trans_offsets[TRANSCODER_A] + \
+#define _MMIO_TRANS2(tran, reg)		_MMIO(DISPLAY_INFO(dev_priv)->trans_offsets[(tran)] - \
+					      DISPLAY_INFO(dev_priv)->trans_offsets[TRANSCODER_A] + \
 					      DISPLAY_MMIO_BASE(dev_priv) + (reg))
-#define _MMIO_CURSOR2(pipe, reg)	_MMIO(INTEL_INFO(dev_priv)->display.cursor_offsets[(pipe)] - \
-					      INTEL_INFO(dev_priv)->display.cursor_offsets[PIPE_A] + \
+#define _MMIO_CURSOR2(pipe, reg)	_MMIO(DISPLAY_INFO(dev_priv)->cursor_offsets[(pipe)] - \
+					      DISPLAY_INFO(dev_priv)->cursor_offsets[PIPE_A] + \
 					      DISPLAY_MMIO_BASE(dev_priv) + (reg))
 
 #endif /* __INTEL_DISPLAY_REG_DEFS_H__ */

drivers/gpu/drm/i915/display/intel_fb_pin.c

@@ -243,7 +243,7 @@ int intel_plane_pin_fb(struct intel_plane_state *plane_state)
 	struct i915_vma *vma;
 	bool phys_cursor =
 		plane->id == PLANE_CURSOR &&
-		INTEL_INFO(dev_priv)->display.cursor_needs_physical;
+		DISPLAY_INFO(dev_priv)->cursor_needs_physical;
 
 	if (!intel_fb_uses_dpt(fb)) {
 		vma = intel_pin_and_fence_fb_obj(fb, phys_cursor,

drivers/gpu/drm/i915/display/intel_hti.c

@@ -15,7 +15,7 @@ void intel_hti_init(struct drm_i915_private *i915)
 	 * If the platform has HTI, we need to find out whether it has reserved
 	 * any display resources before we create our display outputs.
 	 */
-	if (INTEL_INFO(i915)->display.has_hti)
+	if (DISPLAY_INFO(i915)->has_hti)
 		i915->display.hti.state = intel_de_read(i915, HDPORT_STATE);
 }
 

drivers/gpu/drm/i915/display/skl_watermark.c

@@ -507,8 +507,8 @@ static u16 skl_ddb_entry_init(struct skl_ddb_entry *entry,
 
 static int intel_dbuf_slice_size(struct drm_i915_private *i915)
 {
-	return INTEL_INFO(i915)->display.dbuf.size /
-		hweight8(INTEL_INFO(i915)->display.dbuf.slice_mask);
+	return DISPLAY_INFO(i915)->dbuf.size /
+		hweight8(DISPLAY_INFO(i915)->dbuf.slice_mask);
 }
 
 static void
@@ -527,7 +527,7 @@ skl_ddb_entry_for_slices(struct drm_i915_private *i915, u8 slice_mask,
 	ddb->end = fls(slice_mask) * slice_size;
 
 	WARN_ON(ddb->start >= ddb->end);
-	WARN_ON(ddb->end > INTEL_INFO(i915)->display.dbuf.size);
+	WARN_ON(ddb->end > DISPLAY_INFO(i915)->dbuf.size);
 }
 
 static unsigned int mbus_ddb_offset(struct drm_i915_private *i915, u8 slice_mask)
@@ -2625,7 +2625,7 @@ skl_compute_ddb(struct intel_atomic_state *state)
 			    "Enabled dbuf slices 0x%x -> 0x%x (total dbuf slices 0x%x), mbus joined? %s->%s\n",
 			    old_dbuf_state->enabled_slices,
 			    new_dbuf_state->enabled_slices,
-			    INTEL_INFO(i915)->display.dbuf.slice_mask,
+			    DISPLAY_INFO(i915)->dbuf.slice_mask,
 			    str_yes_no(old_dbuf_state->joined_mbus),
 			    str_yes_no(new_dbuf_state->joined_mbus));
 	}

drivers/gpu/drm/i915/i915_drv.h

@@ -408,6 +408,7 @@ static inline struct intel_gt *to_gt(struct drm_i915_private *i915)
 	     (engine__) = rb_to_uabi_engine(rb_next(&(engine__)->uabi_node)))
 
 #define INTEL_INFO(dev_priv)	(&(dev_priv)->__info)
+#define DISPLAY_INFO(i915)	(INTEL_INFO(i915)->display)
 #define RUNTIME_INFO(dev_priv)	(&(dev_priv)->__runtime)
 #define DRIVER_CAPS(dev_priv)	(&(dev_priv)->caps)
 
@@ -782,9 +783,9 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 	((sizes) & ~RUNTIME_INFO(dev_priv)->page_sizes) == 0; \
 })
 
-#define HAS_OVERLAY(dev_priv)		 (INTEL_INFO(dev_priv)->display.has_overlay)
+#define HAS_OVERLAY(dev_priv)		 (DISPLAY_INFO(dev_priv)->has_overlay)
 #define OVERLAY_NEEDS_PHYSICAL(dev_priv) \
-		(INTEL_INFO(dev_priv)->display.overlay_needs_physical)
+		(DISPLAY_INFO(dev_priv)->overlay_needs_physical)
 
 /* Early gen2 have a totally busted CS tlb and require pinned batches. */
 #define HAS_BROKEN_CS_TLB(dev_priv)	(IS_I830(dev_priv) || IS_I845G(dev_priv))
@@ -806,8 +807,8 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
  */
 #define HAS_128_BYTE_Y_TILING(dev_priv) (GRAPHICS_VER(dev_priv) != 2 && \
 					 !(IS_I915G(dev_priv) || IS_I915GM(dev_priv)))
-#define SUPPORTS_TV(dev_priv)		(INTEL_INFO(dev_priv)->display.supports_tv)
-#define I915_HAS_HOTPLUG(dev_priv)	(INTEL_INFO(dev_priv)->display.has_hotplug)
+#define SUPPORTS_TV(dev_priv)		(DISPLAY_INFO(dev_priv)->supports_tv)
+#define I915_HAS_HOTPLUG(dev_priv)	(DISPLAY_INFO(dev_priv)->has_hotplug)
 
 #define HAS_FW_BLC(dev_priv)	(DISPLAY_VER(dev_priv) > 2)
 #define HAS_FBC(dev_priv)	(RUNTIME_INFO(dev_priv)->fbc_mask != 0)
@@ -817,18 +818,18 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 
 #define HAS_IPS(dev_priv)	(IS_HSW_ULT(dev_priv) || IS_BROADWELL(dev_priv))
 
-#define HAS_DP_MST(dev_priv)	(INTEL_INFO(dev_priv)->display.has_dp_mst)
+#define HAS_DP_MST(dev_priv)	(DISPLAY_INFO(dev_priv)->has_dp_mst)
 #define HAS_DP20(dev_priv)	(IS_DG2(dev_priv) || DISPLAY_VER(dev_priv) >= 14)
 
 #define HAS_DOUBLE_BUFFERED_M_N(dev_priv)	(DISPLAY_VER(dev_priv) >= 9 || IS_BROADWELL(dev_priv))
 
-#define HAS_CDCLK_CRAWL(dev_priv)	 (INTEL_INFO(dev_priv)->display.has_cdclk_crawl)
-#define HAS_CDCLK_SQUASH(dev_priv)	 (INTEL_INFO(dev_priv)->display.has_cdclk_squash)
-#define HAS_DDI(dev_priv)		 (INTEL_INFO(dev_priv)->display.has_ddi)
-#define HAS_FPGA_DBG_UNCLAIMED(dev_priv) (INTEL_INFO(dev_priv)->display.has_fpga_dbg)
-#define HAS_PSR(dev_priv)		 (INTEL_INFO(dev_priv)->display.has_psr)
+#define HAS_CDCLK_CRAWL(dev_priv)	 (DISPLAY_INFO(dev_priv)->has_cdclk_crawl)
+#define HAS_CDCLK_SQUASH(dev_priv)	 (DISPLAY_INFO(dev_priv)->has_cdclk_squash)
+#define HAS_DDI(dev_priv)		 (DISPLAY_INFO(dev_priv)->has_ddi)
+#define HAS_FPGA_DBG_UNCLAIMED(dev_priv) (DISPLAY_INFO(dev_priv)->has_fpga_dbg)
+#define HAS_PSR(dev_priv)		 (DISPLAY_INFO(dev_priv)->has_psr)
 #define HAS_PSR_HW_TRACKING(dev_priv) \
-	(INTEL_INFO(dev_priv)->display.has_psr_hw_tracking)
+	(DISPLAY_INFO(dev_priv)->has_psr_hw_tracking)
 #define HAS_PSR2_SEL_FETCH(dev_priv)	 (DISPLAY_VER(dev_priv) >= 12)
 #define HAS_TRANSCODER(dev_priv, trans)	 ((RUNTIME_INFO(dev_priv)->cpu_transcoder_mask & BIT(trans)) != 0)
 
@@ -839,7 +840,7 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 #define HAS_RPS(dev_priv)	(INTEL_INFO(dev_priv)->has_rps)
 
 #define HAS_DMC(dev_priv)	(RUNTIME_INFO(dev_priv)->has_dmc)
-#define HAS_DSB(dev_priv)	(INTEL_INFO(dev_priv)->display.has_dsb)
+#define HAS_DSB(dev_priv)	(DISPLAY_INFO(dev_priv)->has_dsb)
 #define HAS_DSC(__i915)		(RUNTIME_INFO(__i915)->has_dsc)
 #define HAS_HW_SAGV_WM(i915) (DISPLAY_VER(i915) >= 13 && !IS_DGFX(i915))
 
@@ -869,7 +870,7 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
  */
 #define HAS_64K_PAGES(dev_priv) (INTEL_INFO(dev_priv)->has_64k_pages)
 
-#define HAS_IPC(dev_priv)		(INTEL_INFO(dev_priv)->display.has_ipc)
+#define HAS_IPC(dev_priv)		(DISPLAY_INFO(dev_priv)->has_ipc)
 #define HAS_SAGV(dev_priv)		(DISPLAY_VER(dev_priv) >= 9 && !IS_LP(dev_priv))
 
 #define HAS_REGION(i915, i) (RUNTIME_INFO(i915)->memory_regions & (i))
@@ -889,7 +890,7 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 
 #define HAS_GLOBAL_MOCS_REGISTERS(dev_priv)	(INTEL_INFO(dev_priv)->has_global_mocs)
 
-#define HAS_GMCH(dev_priv) (INTEL_INFO(dev_priv)->display.has_gmch)
+#define HAS_GMCH(dev_priv) (DISPLAY_INFO(dev_priv)->has_gmch)
 
 #define HAS_GMD_ID(i915)	(INTEL_INFO(i915)->has_gmd_id)
 

drivers/gpu/drm/i915/intel_device_info.c

@@ -138,7 +138,7 @@ void intel_device_info_print(const struct intel_device_info *info,
 
 	drm_printf(p, "has_pooled_eu: %s\n", str_yes_no(runtime->has_pooled_eu));
 
-#define PRINT_FLAG(name) drm_printf(p, "%s: %s\n", #name, str_yes_no(info->display.name))
+#define PRINT_FLAG(name) drm_printf(p, "%s: %s\n", #name, str_yes_no(info->display->name))
 	DEV_INFO_DISPLAY_FOR_EACH_FLAG(PRINT_FLAG);
 #undef PRINT_FLAG
 
@@ -388,6 +388,8 @@ mkwrite_device_info(struct drm_i915_private *i915)
 	return (struct intel_device_info *)INTEL_INFO(i915);
 }
 
+static const struct intel_display_device_info no_display = {};
+
 /**
  * intel_device_info_runtime_init - initialize runtime info
  * @dev_priv: the i915 device
@@ -538,7 +540,7 @@ void intel_device_info_runtime_init(struct drm_i915_private *dev_priv)
 	if (!HAS_DISPLAY(dev_priv)) {
 		dev_priv->drm.driver_features &= ~(DRIVER_MODESET |
 						   DRIVER_ATOMIC);
-		memset(&info->display, 0, sizeof(info->display));
+		info->display = &no_display;
 
 		runtime->cpu_transcoder_mask = 0;
 		memset(runtime->num_sprites, 0, sizeof(runtime->num_sprites));

drivers/gpu/drm/i915/intel_device_info.h

@@ -257,7 +257,7 @@ struct intel_device_info {
 	DEV_INFO_FOR_EACH_FLAG(DEFINE_FLAG);
 #undef DEFINE_FLAG
 
-	struct intel_display_device_info display;
+	const struct intel_display_device_info *display;
 
 	/*
 	 * Initial runtime info. Do not access outside of i915_driver_create().