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drm/i915: Reject X/Y tiled BIOS FB if we don't have fenced regions

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The CPU always needs linear view into the BIOS FB, and for X/Y tiled
buffers that is achieved by the use of a fenced region. If the
underlying driver doesn't support fenced regions then we can't keep
the X/Y tiled BIOS FB. i915 has fenced regions, xe does not.

Probably not a big deal since I don't think we've seen tiled BIOS
FBs outside of some MacBooks. See eg. commit d9a515867b
("drm/i915/gen9+: Fix initial readout for Y tiled framebuffers").

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260410150449.9699-9-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä 2026-04-10 18:04:47 +03:00
parent c2a9f16bc9
commit a05eda6f64
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/i915/display/intel_initial_plane.c
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@ -79,9 +79,13 @@ intel_alloc_initial_plane_obj(struct intel_display *display,
switch (fb->modifier) {
case DRM_FORMAT_MOD_LINEAR:
break;
case I915_FORMAT_MOD_X_TILED:
case I915_FORMAT_MOD_Y_TILED:
break;
/* fenced region needed for linear CPU access to tiled FB */
if (intel_parent_has_fenced_regions(display))
break;
fallthrough;
default:
drm_dbg_kms(display->drm, "Unsupported modifier for initial FB: 0x%llx\n",
fb->modifier);