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path: root/drivers/gpu/drm/tegra/drm.c
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Diffstat (limited to 'drivers/gpu/drm/tegra/drm.c')
-rw-r--r--drivers/gpu/drm/tegra/drm.c23
1 files changed, 20 insertions, 3 deletions
diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index ff36171c8f..373bcd7925 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -1242,9 +1242,26 @@ static int host1x_drm_probe(struct host1x_device *dev)
drm_mode_config_reset(drm);
- err = drm_aperture_remove_framebuffers(&tegra_drm_driver);
- if (err < 0)
- goto hub;
+ /*
+ * Only take over from a potential firmware framebuffer if any CRTCs
+ * have been registered. This must not be a fatal error because there
+ * are other accelerators that are exposed via this driver.
+ *
+ * Another case where this happens is on Tegra234 where the display
+ * hardware is no longer part of the host1x complex, so this driver
+ * will not expose any modesetting features.
+ */
+ if (drm->mode_config.num_crtc > 0) {
+ err = drm_aperture_remove_framebuffers(&tegra_drm_driver);
+ if (err < 0)
+ goto hub;
+ } else {
+ /*
+ * Indicate to userspace that this doesn't expose any display
+ * capabilities.
+ */
+ drm->driver_features &= ~(DRIVER_MODESET | DRIVER_ATOMIC);
+ }
err = drm_dev_register(drm, 0);
if (err < 0)