[PATCH 1/2] drm/xe/pm: Temporarily disable D3Cold on BMG

[Rodrigo Vivi]

Currently, many instability cases related to D3Cold -> D0 transition
on BMG are under investigation. Among them some bad cases where
the device is lost after 1 to 3 transitions from D3Cold to D0
on the runtime pm, with pcieport upstream bridge port link retrain
failure.

In other cases, it works fine, but with some sudden random memory
corruptions after D3cold, that could be 0xffff missed ack on GT
forcewake or GuC reload related failures.

In some other cases though, D3Cold -> D0 works pretty reliably.
It looks like it is a combination of GPU cards and Host boards at
this point. So, there is no possible/available quirk at this time.

This patch disables the D3Cold by default on BMG by reducing the
vram_d3cold_threshold to 0. Users and developers who wants to enable
it are still able to via
$ echo 300 > /sys/bus/pci/devices/<addr>/vram_d3cold_threshold

Fixes: 3adcf970dc7e ("drm/xe/bmg: Drop force_probe requirement")
Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/4037
Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/4395
Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/4396
Cc: Karthik Poosa <karthik.poosa at intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
 drivers/gpu/drm/xe/xe_pm.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_pm.c b/drivers/gpu/drm/xe/xe_pm.c
index 12200be7b43d..a9f61a5fc971 100644
--- a/drivers/gpu/drm/xe/xe_pm.c
+++ b/drivers/gpu/drm/xe/xe_pm.c
@@ -287,6 +287,7 @@ ALLOW_ERROR_INJECTION(xe_pm_init_early, ERRNO); /* See xe_pci_probe() */
  */
 int xe_pm_init(struct xe_device *xe)
 {
+	u32 vram_threshold;
 	int err;
 
 	/* For now suspend/resume is only allowed with GuC */
@@ -300,7 +301,11 @@ int xe_pm_init(struct xe_device *xe)
 		if (err)
 			return err;
 
-		err = xe_pm_set_vram_threshold(xe, DEFAULT_VRAM_THRESHOLD);
+		/* FIXME: D3Cold temporarily disabled by default on BMG */
+		vram_threshold = xe->info.platform == XE_BATTLEMAGE ? 0 :
+				DEFAULT_VRAM_THRESHOLD;
+
+		err = xe_pm_set_vram_threshold(xe, vram_threshold);
 		if (err)
 			return err;
 	}
-- 
2.48.1