Hello,
This series adds initial support for the DRM bridges to NVIDIA Tegra DRM
driver. This is required by newer device-trees where we model the LVDS
encoder bridge properly. In particular this series is needed in order to
light up display panels of recently merged Acer A500 and Nexus 7 devices.
Changelog:
v10: - No changes. Patches missed v5.9 kernel, re-sending for v5.10.
@Thierry, please pick up this series into linux-next or let me
know what needs to be changed, thanks in advance!
v9: - Dropped the of-graph/drm-of patches from this series because they
are now factored out into a standalone series [1].
[1] https://patchwork.ozlabs.org/project/linux-tegra/list/?series=186813
- The "drm/panel-simple: Add missing connector type for some panels"
patch of v8 was already applied.
v8: - The new of_graph_get_local_port() helper is replaced with the
of_graph_presents(), which simply checks the graph presence in a
given DT node. Thank to Laurent Pinchart for the suggestion!
- The of_graph_get_local_port() is still there, but now it isn't a public
function anymore. In the review to v7 Laurent Pinchart suggested that
the function's doc-comments and name could be improved and I implemented
these suggestions in v8.
- A day ago I discovered that devm_drm_panel_bridge_add() requires
panel to have connector type to be properly set, otherwise function
rejects panels with the incomplete description. So, I checked what
LVDS panels are used on Tegra and fixed the missing connector types
in this new patch:
drm/panel-simple: Add missing connector type for some panels
v7: - Removed the obscure unused structs (which GCC doesn't detect, but CLANG
does) in the patch "Wrap directly-connected panel into DRM bridge",
which was reported by kernel test robot for v6.
v6: - Added r-b and acks from Rob Herring and Sam Ravnborg.
- Rebased on a recent linux-next, patches now apply without fuzz.
v5: - Added new patches that make drm_of_find_panel_or_bridge() more usable
if graph isn't defined in a device-tree:
of_graph: add of_graph_get_local_port()
drm/of: Make drm_of_find_panel_or_bridge() to check graph's presence
- Updated "Support DRM bridges" patch to use drm_of_find_panel_or_bridge()
directly and added WARN_ON(output->panel || output->bridge) sanity-check.
- Added new "Wrap directly-connected panel into DRM bridge" patch, as
was suggested by Laurent Pinchart.
v4: - Following review comments that were made by Laurent Pinchart to the v3,
we now create and use the "bridge connector".
v3: - Following recommendation from Sam Ravnborg, the new bridge attachment
model is now being used, i.e. we ask bridge to *not* create a connector
using the DRM_BRIDGE_ATTACH_NO_CONNECTOR flag.
- The bridge is now created only for the RGB (LVDS) output, and only
when necessary. For now we don't need bridges for HDMI or DSI outputs.
- I noticed that we're leaking OF node in the panel's error code path,
this is fixed now by the new patch "Don't leak OF node on error".
v2: - Added the new "rgb: Don't register connector if bridge is used"
patch, which hides the unused connector provided by the Tegra DRM
driver when bridge is used, since bridge provides its own connector
to us.
Dmitry Osipenko (4):
drm/tegra: output: Don't leak OF node on error
drm/tegra: output: Support DRM bridges
drm/tegra: output: rgb: Support LVDS encoder bridge
drm/tegra: output: rgb: Wrap directly-connected panel into DRM bridge
drivers/gpu/drm/tegra/drm.h | 2 +
drivers/gpu/drm/tegra/output.c | 21 +++++--
drivers/gpu/drm/tegra/rgb.c | 102 +++++++++++++++++----------------
3 files changed, 72 insertions(+), 53 deletions(-)
--
2.27.0
