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backend-drm: use linear buffers if gbm and kms device differ

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If we are using multiple GPUs and are not able to use modifiers to ensure that
the formats are compatible, we have to use linear buffers for the transfer.

Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
This commit is contained in:
Michael Tretter 2021-11-11 15:18:51 +01:00 committed by Daniel Stone
parent 48b39d31ef
commit 575804c7e1
1 changed files with 9 additions and 0 deletions
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9
libweston/backend-drm/drm-gbm.c
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@ -194,6 +194,15 @@ create_gbm_surface(struct gbm_device *gbm, struct drm_output *output)
}
#endif
/*
* If we cannot use modifiers to allocate the GBM surface and the GBM
* device differs from the KMS display device (because we are rendering
* on a different GPU), we have to use linear buffers to make sure that
* the allocated GBM surface is correctly displayed on the KMS device.
*/
if (gbm_device_get_fd(gbm) != output->device->drm.fd)
output->gbm_bo_flags |= GBM_BO_USE_LINEAR;
/* We may allocate with no modifiers in the following situations:
*
* 1. old GBM version, so HAVE_GBM_MODIFIERS is false;