drm/xe/pm: Re-enable D3Cold by default on BMG

This patch re-enables D3Cold by default on BMG.

If issues on runtime_pm resume are seen and the D3cold->D0 transition
is suspected to block the device or cause memory corruptions, D3cold
can be disabled for confirmation with either:

1. at runtime:
   echo 0 > /sys/bus/pci/devices/<addr>/vram_d3cold_threshold

2. at boot:
   pcie_port_pm=off

Upon confirmation of D3Cold related bug, please file a bug to the
link below.

Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/


Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250308005636.1475420-2-rodrigo.vivi@intel.com


Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_pm.c

@@ -279,10 +279,6 @@ ALLOW_ERROR_INJECTION(xe_pm_init_early, ERRNO); /* See xe_pci_probe() */
 
 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;
-
 	return DEFAULT_VRAM_THRESHOLD;
 }