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egl-gbm: fix for kms display-only rendering

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The tegra-drm + nvidia-drm setup on r36 is tenuous with respect
to egl-gbm (and particularly calls to eglGetPlatformDisplayEXT with
EGL_PLATFORM_GBM_KHR). It was only working somewhat by chance due
to the order that devices are probed and then made available to
readdir().

This change adds a patch to egl-gbm to provide a fallback in the
case where eglGetPlatformDisplayEXT(EGL_PLATFORM_GBM_KHR) might have
otherwise failed for no good reason, thus eliminating the need for
workarounds to enforce ordering of the modules loading.

Signed-off-by: Kurt Kiefer <kekiefer@gmail.com>
This commit is contained in:
Kurt Kiefer
2024-08-29 15:32:56 -07:00
committed by Matt Madison
parent 63ef5b0faf
commit bbc0362ea3
2 changed files with 45 additions and 5 deletions
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41
recipes-graphics/mesa/egl-gbm/0001-gbm-display-handle-kms-display-only-devices-in-FindG.patch Normal file
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@@ -0,0 +1,41 @@
From f28f8e7e7013ed151ab69ae6b0f4b52ef617dc89 Mon Sep 17 00:00:00 2001
From: Kurt Kiefer <kekiefer@gmail.com>
Date: Thu, 29 Aug 2024 15:15:33 -0700
Subject: [PATCH] gbm-display: handle kms display-only devices in FindGbmDevice
A display device can be different than its renderer, such as the
case of a kms display-only device. Yet, eglGbmGetPlatformDisplay
needs to initialize its internal GbmDisplay structure and if they
aren't strongly associated (as determined by eglQueryDevices) then
display initialization will fail.
Handle this by providing a fallback to use the first renderer
returned by eglQueryDevices in the case where the display device
in question can't render on its own or isn't being returned by
the egl implementation for any other reason.
Upstream-status: pending
Signed-off-by: Kurt Kiefer <kekiefer@gmail.com>
---
src/gbm-display.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/src/gbm-display.c b/src/gbm-display.c
index 93bceb4..3144017 100644
--- a/src/gbm-display.c
+++ b/src/gbm-display.c
@@ -119,6 +119,13 @@ FindGbmDevice(GbmPlatformData* data, struct gbm_device* gbm)
}
}
+ // If we didn't find a device, don't panic. This can happen if the gbm
+ // display device isn't a renderer: a kms display-only device, or a split
+ // host1x + drm/kms display such as t234 machines in r36. Use the first
+ // found renderer for these.
+ if (numDevs > 0)
+ dev = devs[0];
+
done:
free(devs);

9
recipes-graphics/mesa/egl-gbm_1.1.0.bb
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@@ -6,14 +6,13 @@ DEPENDS = "eglexternalplatform libdrm virtual/libgbm"
SRC_REPO = "github.com/NVIDIA/egl-gbm.git;protocol=https"
SRCBRANCH = "main"
SRC_URI = "git://${SRC_REPO};branch=${SRCBRANCH}"
SRC_URI = "git://${SRC_REPO};branch=${SRCBRANCH} \
file://nvidia_gbm.json \
file://0001-gbm-display-handle-kms-display-only-devices-in-FindG.patch \
"
# 1.1.0 tag
SRCREV = "39932b2cc4f44cdadd553cc931f3bebd4e348d10"
SRC_URI += "\
file://nvidia_gbm.json \
"
REQUIRED_DISTRO_FEATURES = "opengl"
S = "${WORKDIR}/git"