diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2025-01-22 17:17:52 +0200 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2025-02-06 15:11:55 +0200 |
| commit | 2ffa4878512d429eecffe4ef786cbf102a8b8165 (patch) | |
| tree | 210ce83befea43e862b32c5eaf85fef722640793 | |
| parent | 241d8312131e66f31754659bd49169e1822ac1a8 (diff) | |
drm/i915: Use more optimal VTd alignment for planes
Depending on the platform and/or plane type we can get away
with a bit less alignment in the VT-d w/a. Reduce the numbers
accordingly.
Note that it's not actually clear in VLV/CHV need this w/a,
and if they do we don't actually know what kind of alignment
is sufficient. Leave the 256k alignment in place for now, but
toss in a FIXME.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250122151755.6928-3-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
| -rw-r--r-- | drivers/gpu/drm/i915/display/i9xx_plane.c | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_cursor.c | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_sprite.c | 2 |
3 files changed, 3 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/display/i9xx_plane.c b/drivers/gpu/drm/i915/display/i9xx_plane.c index 19cc34babef3..65a2eb9e92c4 100644 --- a/drivers/gpu/drm/i915/display/i9xx_plane.c +++ b/drivers/gpu/drm/i915/display/i9xx_plane.c @@ -785,6 +785,7 @@ unsigned int vlv_plane_min_alignment(struct intel_plane *plane, if (intel_plane_can_async_flip(plane, fb->modifier)) return 256 * 1024; + /* FIXME undocumented so not sure what's actually needed */ if (intel_scanout_needs_vtd_wa(i915)) return 256 * 1024; diff --git a/drivers/gpu/drm/i915/display/intel_cursor.c b/drivers/gpu/drm/i915/display/intel_cursor.c index ed8e65364539..cbeea9d96517 100644 --- a/drivers/gpu/drm/i915/display/intel_cursor.c +++ b/drivers/gpu/drm/i915/display/intel_cursor.c @@ -375,7 +375,7 @@ static unsigned int i9xx_cursor_min_alignment(struct intel_plane *plane, struct drm_i915_private *i915 = to_i915(plane->base.dev); if (intel_scanout_needs_vtd_wa(i915)) - return 256 * 1024; + return 64 * 1024; return 4 * 1024; /* physical for i915/i945 */ } diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c b/drivers/gpu/drm/i915/display/intel_sprite.c index d63e71fe469e..af121c720b89 100644 --- a/drivers/gpu/drm/i915/display/intel_sprite.c +++ b/drivers/gpu/drm/i915/display/intel_sprite.c @@ -983,7 +983,7 @@ static unsigned int g4x_sprite_min_alignment(struct intel_plane *plane, struct drm_i915_private *i915 = to_i915(plane->base.dev); if (intel_scanout_needs_vtd_wa(i915)) - return 256 * 1024; + return 128 * 1024; return 4 * 1024; } |