drm/xe/pm: Disable D3Cold for BMG only on specific platforms

Restrict D3Cold disablement for BMG to unsupported NUC platforms,
instead of disabling it on all platforms.

Signed-off-by: Karthik Poosa <[e-mail]>
Fixes: 3e331a6715ee ("drm/xe/pm: Temporarily disable D3Cold on BMG")
Link: https://patch.msgid.link/[e-mail]
Reviewed-by: Rodrigo Vivi <[e-mail]>
Signed-off-by: Rodrigo Vivi <[e-mail]>
(cherry picked from commit 39125eaf8863ab09d70c4b493f58639b08d5a897)
Signed-off-by: Thomas Hellström <[e-mail]>

drivers/gpu/drm/xe/xe_pm.c

···
 #include <linux/fault-inject.h>
 #include <linux/pm_runtime.h>
 #include <linux/suspend.h>
+#include <linux/dmi.h>
 
 #include <drm/drm_managed.h>
 #include <drm/ttm/ttm_placement.h>
···
 
 static u32 vram_threshold_value(struct xe_device *xe)
 {
-	/* FIXME: D3Cold temporarily disabled by default on BMG */
-	if (xe->info.platform == XE_BATTLEMAGE)
-		return 0;
+	if (xe->info.platform == XE_BATTLEMAGE) {
+		const char *product_name;
+
+		product_name = dmi_get_system_info(DMI_PRODUCT_NAME);
+		if (product_name && strstr(product_name, "NUC13RNG")) {
+			drm_warn(&xe->drm, "BMG + D3Cold not supported on this platform\n");
+			return 0;
+		}
+	}
 
 	return DEFAULT_VRAM_THRESHOLD;
 }