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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-08 16:58:07 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-08 16:58:07 +0000
commit5a6d13c86f2fe6304450e907fc1d8d72da82efef (patch)
tree1bd4e8854203c575eabaa99e2c509f8886065733 /drivers/gpu/drm/tegra/drm.c
parentAdding upstream version 6.1.76. (diff)
downloadlinux-84c1f1a2669300eff95517b777594aca7cc3ee5a.tar.xz
linux-84c1f1a2669300eff95517b777594aca7cc3ee5a.zip
Adding upstream version 6.1.82.upstream/6.1.82
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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 5fc55b977..6806779f8 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -1252,9 +1252,26 @@ 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 = tegra_drm_fb_init(drm);
if (err < 0)