On 30/06/2023 18:01, Nirmoy Das wrote:
Use smem on MTL due to a HW bug in MTL that prevents
reading from stolen memory using LMEM BAR.
Does anything remain in stolen or could the memory region just not be
created?
Regards,
Tvrtko
Cc: Oak Zeng <oak.zeng@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
Cc: Andrzej Hajda <andrzej.hajda@xxxxxxxxx>
Signed-off-by: Nirmoy Das <nirmoy.das@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_fbdev.c | 2 ++
drivers/gpu/drm/i915/display/intel_overlay.c | 7 ++++---
2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_fbdev.c b/drivers/gpu/drm/i915/display/intel_fbdev.c
index 1cc0ddc6a310..10e38d60f9ef 100644
--- a/drivers/gpu/drm/i915/display/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/display/intel_fbdev.c
@@ -182,6 +182,8 @@ static int intelfb_alloc(struct drm_fb_helper *helper,
obj = i915_gem_object_create_lmem(dev_priv, size,
I915_BO_ALLOC_CONTIGUOUS |
I915_BO_ALLOC_USER);
+ } else if (IS_METEORLAKE(dev_priv)) { /* Wa_22018444074 */
+ obj = i915_gem_object_create_shmem(dev_priv, size);
} else {
/*
* If the FB is too big, just don't use it since fbdev is not very
diff --git a/drivers/gpu/drm/i915/display/intel_overlay.c b/drivers/gpu/drm/i915/display/intel_overlay.c
index d6fe2bbabe55..05ae446c8a56 100644
--- a/drivers/gpu/drm/i915/display/intel_overlay.c
+++ b/drivers/gpu/drm/i915/display/intel_overlay.c
@@ -1348,12 +1348,13 @@ int intel_overlay_attrs_ioctl(struct drm_device *dev, void *data,
static int get_registers(struct intel_overlay *overlay, bool use_phys)
{
struct drm_i915_private *i915 = overlay->i915;
- struct drm_i915_gem_object *obj;
+ struct drm_i915_gem_object *obj = NULL;
struct i915_vma *vma;
int err;
- obj = i915_gem_object_create_stolen(i915, PAGE_SIZE);
- if (IS_ERR(obj))
+ if (!IS_METEORLAKE(i915)) /* Wa_22018444074 */
+ obj = i915_gem_object_create_stolen(i915, PAGE_SIZE);
+ if (IS_ERR_OR_NULL(obj))
obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
if (IS_ERR(obj))
return PTR_ERR(obj);
