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authorLyude Paul <lyude@redhat.com>2021-04-23 14:42:55 -0400
committerLyude Paul <lyude@redhat.com>2021-04-27 18:43:42 -0400
commit6cba3fe433415b2549c909ce72601902c8254a83 (patch)
treec5b515f79bfbdd309e30f95a3136c2bb4ec6cf76 /drivers/gpu/drm/tegra
parentfd43ad9d47e74018d4487dcb3f828ae398fb3530 (diff)
drm/dp: Add backpointer to drm_device in drm_dp_aux
This is something that we've wanted for a while now: the ability to actually look up the respective drm_device for a given drm_dp_aux struct. This will also allow us to transition over to using the drm_dbg_*() helpers for debug message printing, as we'll finally have a drm_device to reference for doing so. Note that there is one limitation with this - because some DP AUX adapters exist as platform devices which are initialized independently of their respective DRM devices, one cannot rely on drm_dp_aux->drm_dev to always be non-NULL until drm_dp_aux_register() has been called. We make sure to point this out in the documentation for struct drm_dp_aux. v3: * Add WARN_ON_ONCE() to drm_dp_aux_register() if drm_dev isn't filled out Signed-off-by: Lyude Paul <lyude@redhat.com> Acked-by: Thierry Reding <treding@nvidia.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210423184309.207645-4-lyude@redhat.com Reviewed-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/tegra')
-rw-r--r--drivers/gpu/drm/tegra/dpaux.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tegra/dpaux.c b/drivers/gpu/drm/tegra/dpaux.c
index ea56c6ec25e4..7d7cc90b6fc9 100644
--- a/drivers/gpu/drm/tegra/dpaux.c
+++ b/drivers/gpu/drm/tegra/dpaux.c
@@ -719,6 +719,7 @@ int drm_dp_aux_attach(struct drm_dp_aux *aux, struct tegra_output *output)
unsigned long timeout;
int err;
+ aux->drm_dev = output->connector.dev;
err = drm_dp_aux_register(aux);
if (err < 0)
return err;