[Intel-gfx] [PATCH 2/9] drm/i915/dsb: Disable DSB until fixed

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Our DSB support is borked. The DSB seems to get stuck and we just
get:
[drm:intel_dsb_commit [i915]] DSB execution started - head 0xa8c000, tail 0x10c0
[drm:intel_dsb_commit [i915]] *ERROR* Timed out waiting for DSB workload completion.
[drm:icl_load_luts [i915]] DSB engine is busy.

Which even seems to result in underruns on some internal stuff.
Let's just disable it all until someone figures out what's wrong
with it.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_dsb.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dsb.c b/drivers/gpu/drm/i915/display/intel_dsb.c
index 12776f09f227..a16a78cd0ebe 100644
--- a/drivers/gpu/drm/i915/display/intel_dsb.c
+++ b/drivers/gpu/drm/i915/display/intel_dsb.c
@@ -105,7 +105,11 @@ intel_dsb_get(struct intel_crtc *crtc)
 	u32 *buf;
 	intel_wakeref_t wakeref;
 
-	if (!HAS_DSB(i915))
+	/*
+	 * FIXME DSB support is busted. DSB tends to be
+	 * busy when it shouldn't be. Disable until fixed.
+	 */
+	if (true || !HAS_DSB(i915))
 		return dsb;
 
 	if (dsb->refcount++ != 0)
-- 
2.24.1