[PATCH xe-i915-for-6.11 02/22] drm/i915: disable fbc due to Wa_16023588340

[Lucas De Marchi]

From: Matthew Auld <matthew.auld at intel.com>

commit c55f79f317ab428ae6d005965bc07e37496f209f upstream.

On BMG-G21 we need to disable fbc due to complications around the WA.

v2:
 - Try to handle with i915_drv.h and compat layer. (Rodrigo)
v3:
 - For simplicity retreat back to the original design for now.
 - Drop the extra \ from the Makefile (Jani)

Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Jonathan Cavitt <jonathan.cavitt at intel.com>
Cc: Matt Roper <matthew.d.roper at intel.com>
Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Cc: Vinod Govindapillai <vinod.govindapillai at intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
Cc: intel-gfx at lists.freedesktop.org
Reviewed-by: Jonathan Cavitt <jonathan.cavitt at intel.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240703124338.208220-4-matthew.auld@intel.com
[ commit dc0f1644c47e ("drm/xe: Generate oob before compiling anything")
  makes part of the change to the Makefile not needed.
  Drop that to resolve conflict. ]
Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_wa.h |  8 ++++++++
 drivers/gpu/drm/i915/display/intel_fbc.c        |  6 ++++++
 drivers/gpu/drm/xe/Makefile                     |  1 +
 drivers/gpu/drm/xe/display/xe_display_wa.c      | 16 ++++++++++++++++
 4 files changed, 31 insertions(+)
 create mode 100644 drivers/gpu/drm/xe/display/xe_display_wa.c

diff --git a/drivers/gpu/drm/i915/display/intel_display_wa.h b/drivers/gpu/drm/i915/display/intel_display_wa.h
index 63201d09852c5..be644ab6ae006 100644
--- a/drivers/gpu/drm/i915/display/intel_display_wa.h
+++ b/drivers/gpu/drm/i915/display/intel_display_wa.h
@@ -6,8 +6,16 @@
 #ifndef __INTEL_DISPLAY_WA_H__
 #define __INTEL_DISPLAY_WA_H__
 
+#include <linux/types.h>
+
 struct drm_i915_private;
 
 void intel_display_wa_apply(struct drm_i915_private *i915);
 
+#ifdef I915
+static inline bool intel_display_needs_wa_16023588340(struct drm_i915_private *i915) { return false; }
+#else
+bool intel_display_needs_wa_16023588340(struct drm_i915_private *i915);
+#endif
+
 #endif
diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index 67116c9f14643..8488f82143a40 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -56,6 +56,7 @@
 #include "intel_display_device.h"
 #include "intel_display_trace.h"
 #include "intel_display_types.h"
+#include "intel_display_wa.h"
 #include "intel_fbc.h"
 #include "intel_fbc_regs.h"
 #include "intel_frontbuffer.h"
@@ -1237,6 +1238,11 @@ static int intel_fbc_check_plane(struct intel_atomic_state *state,
 		return 0;
 	}
 
+	if (intel_display_needs_wa_16023588340(i915)) {
+		plane_state->no_fbc_reason = "Wa_16023588340";
+		return 0;
+	}
+
 	/* WaFbcTurnOffFbcWhenHyperVisorIsUsed:skl,bxt */
 	if (i915_vtd_active(i915) && (IS_SKYLAKE(i915) || IS_BROXTON(i915))) {
 		plane_state->no_fbc_reason = "VT-d enabled";
diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
index 1979614a90bdd..1ff9602a52f67 100644
--- a/drivers/gpu/drm/xe/Makefile
+++ b/drivers/gpu/drm/xe/Makefile
@@ -175,6 +175,7 @@ xe-$(CONFIG_DRM_XE_DISPLAY) += \
 	display/xe_display.o \
 	display/xe_display_misc.o \
 	display/xe_display_rps.o \
+	display/xe_display_wa.o \
 	display/xe_dsb_buffer.o \
 	display/xe_fb_pin.o \
 	display/xe_hdcp_gsc.o \
diff --git a/drivers/gpu/drm/xe/display/xe_display_wa.c b/drivers/gpu/drm/xe/display/xe_display_wa.c
new file mode 100644
index 0000000000000..68e3d1959ad6a
--- /dev/null
+++ b/drivers/gpu/drm/xe/display/xe_display_wa.c
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2024 Intel Corporation
+ */
+
+#include "intel_display_wa.h"
+
+#include "xe_device.h"
+#include "xe_wa.h"
+
+#include <generated/xe_wa_oob.h>
+
+bool intel_display_needs_wa_16023588340(struct drm_i915_private *i915)
+{
+	return XE_WA(xe_root_mmio_gt(i915), 16023588340);
+}
-- 
2.47.0