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drm/i915/display: Do not use stolen on MTL

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Use smem on MTL due to a HW bug in MTL that prevents
reading from stolen memory using LMEM BAR.

v2 and v3: improve stolen skip detection(Andrzej)

Cc: Oak Zeng <oak.zeng@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Andi Shyti <andi.shyti@linux.intel.com>
Cc: Andrzej Hajda <andrzej.hajda@intel.com>
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Oak Zeng <oak.zeng@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230713150142.12700-2-nirmoy.das@intel.com
This commit is contained in:
Nirmoy Das
2023-07-13 17:01:42 +02:00
parent 290d161045
commit c5741c5c11
2 changed files with 6 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/i915/display/intel_fbdev.c
View File

@@ -182,8 +182,10 @@ static int intelfb_alloc(struct drm_fb_helper *helper,
* If the FB is too big, just don't use it since fbdev is not very
* important and we should probably use that space with FBC or other
* features.
*
* Also skip stolen on MTL as Wa_22018444074 mitigation.
*/
if (size * 2 < dev_priv->dsm.usable_size)
if (!(IS_METEORLAKE(dev_priv)) && size * 2 < dev_priv->dsm.usable_size)
obj = i915_gem_object_create_stolen(dev_priv, size);
if (IS_ERR(obj))
obj = i915_gem_object_create_shmem(dev_priv, size);

5
drivers/gpu/drm/i915/display/intel_overlay.c
View File

@@ -1348,11 +1348,12 @@ 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 = ERR_PTR(-ENODEV);
struct i915_vma *vma;
int err;
obj = i915_gem_object_create_stolen(i915, PAGE_SIZE);
if (!IS_METEORLAKE(i915)) /* Wa_22018444074 */
obj = i915_gem_object_create_stolen(i915, PAGE_SIZE);
if (IS_ERR(obj))
obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
if (IS_ERR(obj))