[PATCH v4 1/3] drm/i915: Disable DSB in Xe KMD

["José Roberto de Souza" <jose.souza@intel.com>]

Often getting DSB 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)

v3:
- use IS_ENABLED(I915) check in intel_dsb_prepare()

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@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Francois Dugast <francois.dugast@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
---
 drivers/gpu/drm/i915/display/intel_dsb.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c b/drivers/gpu/drm/i915/display/intel_dsb.c
index 482c28b5c2de5..a6c7122fd671d 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.c
+++ b/drivers/gpu/drm/i915/display/intel_dsb.c
@@ -453,6 +453,10 @@ struct intel_dsb *intel_dsb_prepare(const struct intel_crtc_state *crtc_state,
 	if (!HAS_DSB(i915))
 		return NULL;
 
+	/* TODO: DSB is broken in Xe KMD, so disabling it until fixed */
+	if (!IS_ENABLED(I915))
+		return NULL;
+
 	dsb = kzalloc(sizeof(*dsb), GFP_KERNEL);
 	if (!dsb)
 		goto out;
-- 
2.43.0