From c5741c5c1122b7944d9af185c83ab7056153259e Mon Sep 17 00:00:00 2001 From: Nirmoy Das Date: Thu, 13 Jul 2023 17:01:42 +0200 Subject: [PATCH] drm/i915/display: Do not use stolen on MTL 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 Cc: Jani Nikula Cc: Joonas Lahtinen Cc: Andi Shyti Cc: Andrzej Hajda Signed-off-by: Nirmoy Das Reviewed-by: Oak Zeng Reviewed-by: Andrzej Hajda Reviewed-by: Andi Shyti Link: https://patchwork.freedesktop.org/patch/msgid/20230713150142.12700-2-nirmoy.das@intel.com --- drivers/gpu/drm/i915/display/intel_fbdev.c | 4 +++- drivers/gpu/drm/i915/display/intel_overlay.c | 5 +++-- 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 80c3f88310dbb..e75852f13930f 100644 --- a/drivers/gpu/drm/i915/display/intel_fbdev.c +++ b/drivers/gpu/drm/i915/display/intel_fbdev.c @@ -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); diff --git a/drivers/gpu/drm/i915/display/intel_overlay.c b/drivers/gpu/drm/i915/display/intel_overlay.c index d6fe2bbabe559..09c1aa1427adb 100644 --- a/drivers/gpu/drm/i915/display/intel_overlay.c +++ b/drivers/gpu/drm/i915/display/intel_overlay.c @@ -1348,11 +1348,12 @@ out_unlock: 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)) -- 2.30.2