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| author |   Lyude Paul <lyude@redhat.com> | 2021-03-26 16:37:49 -0400 |
|---|---|---|
| committer | Lyude Paul <lyude@redhat.com> | 2021-04-08 17:44:58 -0400 |
| commit | 39c17ae60ea9ad265f6402f6e23e988f06dfc441 (patch) | |
| tree | 9df44cb9318dad9f0c05affb3f9e9cef21976f31 | |
| parent | drm/dp: Fixup kernel docs for struct drm_dp_aux (diff) | |
| download | linux-dev-39c17ae60ea9ad265f6402f6e23e988f06dfc441.tar.xz linux-dev-39c17ae60ea9ad265f6402f6e23e988f06dfc441.zip | |
drm/tegra: Don't register DP AUX channels before connectors
As pointed out by the documentation for drm_dp_aux_register(),
drm_dp_aux_init() should be used in situations where the AUX channel for a
display driver can potentially be registered before it's respective DRM
driver. This is the case with Tegra, since the DP aux channel exists as a
platform device instead of being a grandchild of the DRM device.
Since we're about to add a backpointer to a DP AUX channel's respective DRM
device, let's fix this so that we don't potentially allow userspace to use
the AUX channel before we've associated it with it's DRM connector.
Signed-off-by: Lyude Paul <lyude@redhat.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210326203807.105754-3-lyude@redhat.com
| -rw-r--r-- | drivers/gpu/drm/tegra/dpaux.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/gpu/drm/tegra/dpaux.c b/drivers/gpu/drm/tegra/dpaux.c index 105fb9cdbb3b..ea56c6ec25e4 100644 --- a/drivers/gpu/drm/tegra/dpaux.c +++ b/drivers/gpu/drm/tegra/dpaux.c @@ -534,9 +534,7 @@ static int tegra_dpaux_probe(struct platform_device *pdev) dpaux->aux.transfer = tegra_dpaux_transfer; dpaux->aux.dev = &pdev->dev; - err = drm_dp_aux_register(&dpaux->aux); - if (err < 0) - return err; + drm_dp_aux_init(&dpaux->aux); /* * Assume that by default the DPAUX/I2C pads will be used for HDMI, @@ -589,8 +587,6 @@ static int tegra_dpaux_remove(struct platform_device *pdev) pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); - drm_dp_aux_unregister(&dpaux->aux); - mutex_lock(&dpaux_lock); list_del(&dpaux->list); mutex_unlock(&dpaux_lock); @@ -723,6 +719,10 @@ int drm_dp_aux_attach(struct drm_dp_aux *aux, struct tegra_output *output) unsigned long timeout; int err; + err = drm_dp_aux_register(aux); + if (err < 0) + return err; + output->connector.polled = DRM_CONNECTOR_POLL_HPD; dpaux->output = output; @@ -760,6 +760,7 @@ int drm_dp_aux_detach(struct drm_dp_aux *aux) unsigned long timeout; int err; + drm_dp_aux_unregister(aux); disable_irq(dpaux->irq); if (dpaux->output->panel) { |