[PATCH v2] drm/i915: Disable DSB in Xe KMD

[José Roberto de Souza]

Often getting DBS overflows when starting Xorg or Wayland compositors
when running Xe KMD.
Issue was reported but nothing was done, so disabling DSB as whole
until properly fixed in Xe KMD.

v2:
- move check to HAS_DSB(Jani)

Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/989
Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/1031
Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/1072
Cc: Animesh Manna <animesh.manna at intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_device.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display_device.h b/drivers/gpu/drm/i915/display/intel_display_device.h
index fe42688137863..faa49aced46a5 100644
--- a/drivers/gpu/drm/i915/display/intel_display_device.h
+++ b/drivers/gpu/drm/i915/display/intel_display_device.h
@@ -45,7 +45,12 @@ struct drm_printer;
 #define HAS_DP_MST(i915)		(DISPLAY_INFO(i915)->has_dp_mst)
 #define HAS_DP20(i915)			(IS_DG2(i915) || DISPLAY_VER(i915) >= 14)
 #define HAS_DPT(i915)			(DISPLAY_VER(i915) >= 13)
+#ifdef I915
 #define HAS_DSB(i915)			(DISPLAY_INFO(i915)->has_dsb)
+#else
+/* TODO: DSB is broken in Xe KMD, so disabling it until fixed */
+#define HAS_DSB(i915)			(false)
+#endif
 #define HAS_DSC(__i915)			(DISPLAY_RUNTIME_INFO(__i915)->has_dsc)
 #define HAS_FBC(i915)			(DISPLAY_RUNTIME_INFO(i915)->fbc_mask != 0)
 #define HAS_FPGA_DBG_UNCLAIMED(i915)	(DISPLAY_INFO(i915)->has_fpga_dbg)
-- 
2.43.0