display: Detect AuxCCS support via display parent interface

Tvrtko Ursulin Thu, 11 Dec 2025 01:13:22 -0800


On 09/12/2025 13:16, Jani Nikula wrote:

On Tue, 09 Dec 2025, Tvrtko Ursulin <[email protected]> wrote:

From: Tvrtko Ursulin <[email protected]>

Whether AuxCCS can be properly supported depends on the support both from
the display side and non-display side of the driver.

Let us therefore allow for the non-display part to be queried via the
display parent interface.

The new interface replaces the HAS_AUX_CCS macro and we also remove the
FIXME from skl_universal_plane_create since now the xe will not advertise
the AuxCCS caps to start with so they do not need to be removed after
enumeration.

Also, by removing this build specific FIXME we come a step closer to fully
de-coupling display and non-display.

The existing HAS_AUX_CCS gets renamed to HAS_AUX_DIST since it is still
required for determining the need for PLANE_AUX_DIST programming.

Signed-off-by: Tvrtko Ursulin <[email protected]>
References: cf48bddd31de ("drm/i915/display: Disable AuxCCS framebuffers if built 
for Xe")
Cc: [email protected]
Cc: [email protected]
Cc: Jani Nikula <[email protected]>
Cc: José Roberto de Souza <[email protected]>
Cc: Juha-Pekka Heikkila <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Acked-by: Jani Nikula <[email protected]> # v1

Reviewed-by: Jani Nikula <[email protected]>


Pushed to drm-intel-next, thank you!

Regards,

Tvrtko

---
v2:
  * Rename HAS_AUX_CCS to HAS_AUX_DIST and keep using for PLANE_AUX_DIST
    programming. (Ville)
---
  drivers/gpu/drm/i915/display/intel_display_device.h |  2 +-
  drivers/gpu/drm/i915/display/intel_fb.c             |  3 ++-
  drivers/gpu/drm/i915/display/intel_parent.c         |  5 +++++
  drivers/gpu/drm/i915/display/intel_parent.h         |  2 ++
  drivers/gpu/drm/i915/display/skl_universal_plane.c  |  9 ++-------
  drivers/gpu/drm/i915/i915_driver.c                  | 10 ++++++++++
  include/drm/intel/display_parent_interface.h        |  3 +++
  7 files changed, 25 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_device.h 
b/drivers/gpu/drm/i915/display/intel_display_device.h
index 11c2b2883f35..50b2e9ae2c18 100644
--- a/drivers/gpu/drm/i915/display/intel_display_device.h
+++ b/drivers/gpu/drm/i915/display/intel_display_device.h
@@ -149,7 +149,7 @@ struct intel_display_platforms {
  #define HAS_4TILE(__display)          ((__display)->platform.dg2 || 
DISPLAY_VER(__display) >= 14)
  #define HAS_ASYNC_FLIPS(__display)    (DISPLAY_VER(__display) >= 5)
  #define HAS_AS_SDP(__display)         (DISPLAY_VER(__display) >= 13)
-#define HAS_AUX_CCS(__display)         (IS_DISPLAY_VER(__display, 9, 12) || 
(__display)->platform.alderlake_p || (__display)->platform.meteorlake)
+#define HAS_AUX_DIST(__display)                (IS_DISPLAY_VER(__display, 9, 12) || 
(__display)->platform.alderlake_p || (__display)->platform.meteorlake)
  #define HAS_BIGJOINER(__display)      (DISPLAY_VER(__display) >= 11 && 
HAS_DSC(__display))
  #define HAS_CASF(__display)           (DISPLAY_VER(__display) >= 20)
  #define HAS_CDCLK_CRAWL(__display)    
(DISPLAY_INFO(__display)->has_cdclk_crawl)
diff --git a/drivers/gpu/drm/i915/display/intel_fb.c 
b/drivers/gpu/drm/i915/display/intel_fb.c
index b34b4961fe1c..5b8e02ca2faf 100644
--- a/drivers/gpu/drm/i915/display/intel_fb.c
+++ b/drivers/gpu/drm/i915/display/intel_fb.c
@@ -21,6 +21,7 @@
  #include "intel_fb_bo.h"
  #include "intel_frontbuffer.h"
  #include "intel_panic.h"
+#include "intel_parent.h"
  #include "intel_plane.h"

#define check_array_bounds(display, a, i) drm_WARN_ON((display)->drm, (i) >= ARRAY_SIZE(a))

@@ -558,7 +559,7 @@ static bool plane_has_modifier(struct intel_display 
*display,
         * where supported.
         */
        if (intel_fb_is_ccs_modifier(md->modifier) &&
-           HAS_AUX_CCS(display) != !!md->ccs.packed_aux_planes)
+           intel_parent_has_auxccs(display) != !!md->ccs.packed_aux_planes)
                return false;

if (md->modifier == I915_FORMAT_MOD_4_TILED_BMG_CCS &&

diff --git a/drivers/gpu/drm/i915/display/intel_parent.c 
b/drivers/gpu/drm/i915/display/intel_parent.c
index 2ea310cc3509..7a55def19836 100644
--- a/drivers/gpu/drm/i915/display/intel_parent.c
+++ b/drivers/gpu/drm/i915/display/intel_parent.c
@@ -94,3 +94,8 @@ void intel_parent_fence_priority_display(struct intel_display 
*display, struct d
        if (display->parent->fence_priority_display)
                display->parent->fence_priority_display(fence);
  }
+
+bool intel_parent_has_auxccs(struct intel_display *display)
+{
+       return display->parent->has_auxccs && 
display->parent->has_auxccs(display->drm);
+}
diff --git a/drivers/gpu/drm/i915/display/intel_parent.h 
b/drivers/gpu/drm/i915/display/intel_parent.h
index 8f91a6f75c53..f34ee81ed7a1 100644
--- a/drivers/gpu/drm/i915/display/intel_parent.h
+++ b/drivers/gpu/drm/i915/display/intel_parent.h
@@ -33,4 +33,6 @@ bool intel_parent_has_fenced_regions(struct intel_display 
*display);

void intel_parent_fence_priority_display(struct intel_display *display, struct dma_fence *fence);+bool intel_parent_has_auxccs(struct intel_display *display);

+
  #endif /* __INTEL_PARENT_H__ */
diff --git a/drivers/gpu/drm/i915/display/skl_universal_plane.c 
b/drivers/gpu/drm/i915/display/skl_universal_plane.c
index 6cd94f400e3f..40148d225410 100644
--- a/drivers/gpu/drm/i915/display/skl_universal_plane.c
+++ b/drivers/gpu/drm/i915/display/skl_universal_plane.c
@@ -22,6 +22,7 @@
  #include "intel_fbc.h"
  #include "intel_frontbuffer.h"
  #include "intel_panic.h"
+#include "intel_parent.h"
  #include "intel_plane.h"
  #include "intel_psr.h"
  #include "intel_psr_regs.h"
@@ -1602,7 +1603,7 @@ icl_plane_update_noarm(struct intel_dsb *dsb,
        }

/* FLAT CCS doesn't need to program AUX_DIST */

-       if (HAS_AUX_CCS(display))
+       if (HAS_AUX_DIST(display))
                intel_de_write_dsb(display, dsb, PLANE_AUX_DIST(pipe, plane_id),
                                   skl_plane_aux_dist(plane_state, 
color_plane));

@@ -2972,12 +2973,6 @@ skl_universal_plane_create(struct intel_display *display,

        else
                caps = skl_plane_caps(display, pipe, plane_id);

- /* FIXME: xe has problems with AUX */

-       if (!IS_ENABLED(I915) && HAS_AUX_CCS(display))
-               caps &= ~(INTEL_PLANE_CAP_CCS_RC |
-                         INTEL_PLANE_CAP_CCS_RC_CC |
-                         INTEL_PLANE_CAP_CCS_MC);
-
        modifiers = intel_fb_plane_get_modifiers(display, caps);

ret = drm_universal_plane_init(display->drm, &plane->base,

diff --git a/drivers/gpu/drm/i915/i915_driver.c 
b/drivers/gpu/drm/i915/i915_driver.c
index d98839427ef9..59e396a74ca4 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -757,6 +757,15 @@ static void fence_priority_display(struct dma_fence *fence)
                i915_gem_fence_wait_priority_display(fence);
  }

+static bool has_auxccs(struct drm_device *drm)

+{
+       struct drm_i915_private *i915 = to_i915(drm);
+
+       return IS_GRAPHICS_VER(i915, 9, 12) ||
+              IS_ALDERLAKE_P(i915) ||
+              IS_METEORLAKE(i915);
+}
+
  static const struct intel_display_parent_interface parent = {
        .hdcp = &i915_display_hdcp_interface,
        .rpm = &i915_display_rpm_interface,
@@ -765,6 +774,7 @@ static const struct intel_display_parent_interface parent = 
{
        .vgpu_active = vgpu_active,
        .has_fenced_regions = has_fenced_regions,
        .fence_priority_display = fence_priority_display,
+       .has_auxccs = has_auxccs,
  };

const struct intel_display_parent_interface *i915_driver_parent_interface(void)

diff --git a/include/drm/intel/display_parent_interface.h 
b/include/drm/intel/display_parent_interface.h
index 61d1b22adc83..0d79f3c189c3 100644
--- a/include/drm/intel/display_parent_interface.h
+++ b/include/drm/intel/display_parent_interface.h
@@ -80,6 +80,9 @@ struct intel_display_parent_interface {

/** @fence_priority_display: Set display priority. Optional. */

        void (*fence_priority_display)(struct dma_fence *fence);
+
+       /** @has_auxcss: Are AuxCCS formats supported by the parent. Optional. 
*/
+       bool (*has_auxccs)(struct drm_device *drm);
  };

#endif

Re: [PATCH] drm/i915/display: Detect AuxCCS support via display parent interface

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