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Diffstat (limited to 'src/cam/drm.cpp')
-rw-r--r--src/cam/drm.cpp35
1 files changed, 27 insertions, 8 deletions
diff --git a/src/cam/drm.cpp b/src/cam/drm.cpp
index b0602c94..2e4d7985 100644
--- a/src/cam/drm.cpp
+++ b/src/cam/drm.cpp
@@ -430,7 +430,8 @@ int Device::init()
int Device::openCard()
{
const std::string dirName = "/dev/dri/";
- int ret = -ENOENT;
+ bool found = false;
+ int ret;
/*
* Open the first DRM/KMS device beginning with /dev/dri/card. The
@@ -449,24 +450,42 @@ int Device::openCard()
}
for (struct dirent *res; (res = readdir(folder));) {
+ uint64_t cap;
+
if (strncmp(res->d_name, "card", 4))
continue;
const std::string devName = dirName + res->d_name;
fd_ = open(devName.c_str(), O_RDWR | O_CLOEXEC);
- if (fd_ >= 0) {
- ret = 0;
- break;
+ if (fd_ < 0) {
+ ret = -errno;
+ std::cerr << "Failed to open DRM/KMS device " << devName << ": "
+ << strerror(-ret) << std::endl;
+ continue;
}
- ret = -errno;
- std::cerr << "Failed to open DRM/KMS device " << devName << ": "
- << strerror(-ret) << std::endl;
+ /*
+ * Skip devices that don't support the modeset API, to avoid
+ * selecting a DRM device corresponding to a GPU. There is no
+ * modeset capability, but the kernel returns an error for most
+ * caps if mode setting isn't support by the driver. The
+ * DRM_CAP_DUMB_BUFFER capability is one of those, other would
+ * do as well. The capability value itself isn't relevant.
+ */
+ ret = drmGetCap(fd_, DRM_CAP_DUMB_BUFFER, &cap);
+ if (ret < 0) {
+ drmClose(fd_);
+ fd_ = -1;
+ continue;
+ }
+
+ found = true;
+ break;
}
closedir(folder);
- return ret;
+ return found ? 0 : -ENOENT;
}
int Device::getResources()