From acc4dcf1787b9fc43c5748ce06e79f045e07a3ff Mon Sep 17 00:00:00 2001
From: John Stultz <john.stultz@linaro.org>
Date: Thu, 26 Apr 2018 12:05:57 -0700
Subject: drm_hwcomposer: Fall back to client compositon if the gl
 precompostior fails

If the gl precompositor isn't being used, we cannot accept
every layer as a device composited layer.

Thus this patch adds some extra logic in the validate function
to fall back to client side compositing if the gl precompositor
did not initialize properly.

This does force everything to a single plane even if we have
a few available, but a deeper rework of the validate step
planning is needed before we can reliably make use of them.

Credit to Rob Herring, who's single plane patch was what this
was originally based on.

Cc: Marissa Wall <marissaw@google.com>
Cc: Sean Paul <seanpaul@google.com>
Cc: Dmitry Shmidt <dimitrysh@google.com>
Cc: Robert Foss <robert.foss@collabora.com>
Cc: Matt Szczesiak <matt.szczesiak@arm.com>
Cc: Liviu Dudau <Liviu.Dudau@arm.com>
Cc: David Hanna <david.hanna11@gmail.com>
Cc: Rob Herring <rob.herring@linaro.org>
Cc: Alexandru-Cosmin Gheorghe <Alexandru-Cosmin.Gheorghe@arm.com>
Cc: Alistair Strachan <astrachan@google.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
 drmhwctwo.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drmhwctwo.cpp b/drmhwctwo.cpp
index 8e00d71..ede75e0 100644
--- a/drmhwctwo.cpp
+++ b/drmhwctwo.cpp
@@ -695,6 +695,13 @@ HWC2::Error DrmHwcTwo::HwcDisplay::ValidateDisplay(uint32_t *num_types,
         layer.set_validated_type(HWC2::Composition::Client);
         ++*num_types;
         break;
+      case HWC2::Composition::Device:
+        if (!compositor_.uses_GL()) {
+          layer.set_validated_type(HWC2::Composition::Client);
+          ++*num_types;
+          break;
+        }
+	/* fall through */
       default:
         layer.set_validated_type(layer.sf_type());
         break;
-- 
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