drm/i915/dram: Add missing INTEL_DRAM str conversions

Some new dram types were added without adding the corresponding string
conversion, probably because it's not being used by recent platforms.
Add them, together with a BUILD_BUG_ON() to ensure it keeps in sync, in
preparation to make use of them in recent platforms.

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://lore.kernel.org/r/20250324-dram-type-v1-1-bf60ef33ac01@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

drivers/gpu/drm/i915/i915_drv.h

@@ -306,6 +306,7 @@ struct drm_i915_private {
 			INTEL_DRAM_LPDDR5,
 			INTEL_DRAM_GDDR,
 			INTEL_DRAM_GDDR_ECC,
+			__INTEL_DRAM_TYPE_MAX,
 		} type;
 		u8 num_qgv_points;
 		u8 num_psf_gv_points;

drivers/gpu/drm/i915/soc/intel_dram.c

@@ -33,8 +33,14 @@ static const char *intel_dram_type_str(enum intel_dram_type type)
 		DRAM_TYPE_STR(DDR4),
 		DRAM_TYPE_STR(LPDDR3),
 		DRAM_TYPE_STR(LPDDR4),
+		DRAM_TYPE_STR(DDR5),
+		DRAM_TYPE_STR(LPDDR5),
+		DRAM_TYPE_STR(GDDR),
+		DRAM_TYPE_STR(GDDR_ECC),
 	};
 
+	BUILD_BUG_ON(ARRAY_SIZE(str) != __INTEL_DRAM_TYPE_MAX);
+
 	if (type >= ARRAY_SIZE(str))
 		type = INTEL_DRAM_UNKNOWN;
 

drivers/gpu/drm/xe/xe_device_types.h

@@ -576,6 +576,7 @@ struct xe_device {
 			INTEL_DRAM_LPDDR5,
 			INTEL_DRAM_GDDR,
 			INTEL_DRAM_GDDR_ECC,
+			__INTEL_DRAM_TYPE_MAX,
 		} type;
 		u8 num_qgv_points;
 		u8 num_psf_gv_points;