kernel/linux.git/drivers/gpu/drm/drm_of.c, branch v5.19

Revert "drm: of: Lookup if child node has panel or bridge"

2022-04-21T07:18:08+00:00

Commit '80253168dbfd ("drm: of: Lookup if child node has panel or bridge")' attempted to simplify the case of expressing a simple panel under a DSI controller, by assuming that the first non-graph child node was a panel or bridge. Unfortunately for non-trivial cases the first child node might not be a panel or bridge. Examples of this can be a aux-bus in the case of DisplayPort, or an opp-table represented before the panel node. In these cases the reverted commit prevents the caller from ever finding a reference to the panel. This reverts commit '80253168dbfd ("drm: of: Lookup if child node has panel or bridge")', in favor of using an explicit graph reference to the panel in the trivial case as well. Signed-off-by: Bjorn Andersson Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/20220420231230.58499-2-bjorn.andersson@linaro.org

Revert "drm: of: Properly try all possible cases for bridge/panel detection"

2022-04-21T07:18:05+00:00

Commit '80253168dbfd ("drm: of: Lookup if child node has panel or bridge")' introduced the ability to describe a panel under a display controller without having to use a graph to connect the controller to its single child panel (or bridge). The implementation of this would find the first non-graph node and attempt to acquire the related panel or bridge. This prevents cases where any other child node, such as a aux bus for a DisplayPort controller, or an opp-table to find the referenced panel. Commit '67bae5f28c89 ("drm: of: Properly try all possible cases for bridge/panel detection")' attempted to solve this problem by not bypassing the graph reference lookup before attempting to find the panel or bridge. While this does solve the case where a proper graph reference is present, it does not allow the caller to distinguish between a yet-to-be-probed panel or bridge and the absence of a reference to a panel. One such case is a DisplayPort controller that on some boards have an explicitly described reference to a panel, but on others have a discoverable DisplayPort display attached (which doesn't need to be expressed in DeviceTree). This reverts commit '67bae5f28c89 ("drm: of: Properly try all possible cases for bridge/panel detection")', as a step towards reverting commit '80253168dbfd ("drm: of: Lookup if child node has panel or bridge")'. Signed-off-by: Bjorn Andersson Acked-by: Paul Kocialkowski Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/20220420231230.58499-1-bjorn.andersson@linaro.org

Merge drm-misc/drm-misc-next-fixes into drm-misc-fixes

2022-04-05T09:39:22+00:00

There were a few patches left in drm-misc-next-fixes, let's bring them into drm-misc-fixes. Signed-off-by: Maxime Ripard

drm: of: Properly try all possible cases for bridge/panel detection

2022-03-30T08:16:05+00:00

While bridge/panel detection was initially relying on the usual port/ports-based of graph detection, it was recently changed to perform the lookup on any child node that is not port/ports instead when such a node is available, with no fallback on the usual way. This results in breaking detection when a child node is present but does not contain any panel or bridge node, even when the usual port/ports-based of graph is there. In order to support both situations properly, this commit reworks the logic to try both options and not just one of the two: it will only return -EPROBE_DEFER when both have failed. Signed-off-by: Paul Kocialkowski Fixes: 80253168dbfd ("drm: of: Lookup if child node has panel or bridge") Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/20220329132732.628474-1-paul.kocialkowski@bootlin.com

Merge tag 'driver-core-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

2022-03-28T19:41:28+00:00

Pull driver core updates from Greg KH: "Here is the set of driver core changes for 5.18-rc1. Not much here, primarily it was a bunch of cleanups and small updates: - kobj_type cleanups for default_groups - documentation updates - firmware loader minor changes - component common helper added and take advantage of it in many drivers (the largest part of this pull request). All of these have been in linux-next for a while with no reported problems" * tag 'driver-core-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (54 commits) Documentation: update stable review cycle documentation drivers/base/dd.c : Remove the initial value of the global variable Documentation: update stable tree link Documentation: add link to stable release candidate tree devres: fix typos in comments Documentation: add note block surrounding security patch note samples/kobject: Use sysfs_emit instead of sprintf base: soc: Make soc_device_match() simpler and easier to read driver core: dd: fix return value of __setup handler driver core: Refactor sysfs and drv/bus remove hooks driver core: Refactor multiple copies of device cleanup scripts: get_abi.pl: Fix typo in help message kernfs: fix typos in comments kernfs: remove unneeded #if 0 guard ALSA: hda/realtek: Make use of the helper component_compare_dev_name video: omapfb: dss: Make use of the helper component_compare_dev power: supply: ab8500: Make use of the helper component_compare_dev ASoC: codecs: wcd938x: Make use of the helper component_compare/release_of iommu/mediatek: Make use of the helper component_compare/release_of drm: of: Make use of the helper component_release_of ...

drm: of: Lookup if child node has panel or bridge

2022-02-25T16:08:37+00:00

Devices can also be child nodes when we also control that device through the upstream device (ie, MIPI-DCS for a MIPI-DSI device). drm_of_find_panel_or_bridge can lookup panel or bridge for a given device has port and endpoint and it fails to lookup if the device has a child nodes. This patch add support to lookup for a child node of the given parent that isn't either port or ports. Example OF graph representation of DSI host, which has port but not has ports and has child panel node. dsi { compatible = "allwinner,sun6i-a31-mipi-dsi"; #address-cells = <1>; #size-cells = <0>; port { dsi_in_tcon0: endpoint { remote-endpoint = ; }; panel@0 { reg = <0>; }; }; Example OF graph representation of DSI host, which has ports but not has port and has child panel node. dsi { compatible = "samsung,exynos5433-mipi-dsi"; #address-cells = <1>; #size-cells = <0>; ports { #address-cells = <1>; #size-cells = <0>; port@0 { reg = <0>; dsi_to_mic: endpoint { remote-endpoint = <&mic_to_dsi>; }; }; }; panel@0 { reg = <0>; }; }; Example OF graph representation of DSI host, which has neither a port nor a ports but has child panel node. dsi0 { compatible = "ste,mcde-dsi"; #address-cells = <1>; #size-cells = <0>; panel@0 { reg = <0>; }; }; Reviewed-by: Linus Walleij Signed-off-by: Jagan Teki Signed-off-by: Maxime Ripard Link: https://patchwork.freedesktop.org/patch/msgid/20220202160414.16493-1-jagan@amarulasolutions.com

drm: of: Make use of the helper component_release_of

2022-02-25T11:16:13+00:00

Use the common release helper from component. Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: Thomas Zimmermann Signed-off-by: Yong Wu Link: https://lore.kernel.org/r/20220214060819.7334-19-yong.wu@mediatek.com Signed-off-by: Greg Kroah-Hartman

drm: of: Add drm_of_lvds_get_data_mapping

2021-10-14T18:47:30+00:00

Add helper function to convert DT "data-mapping" property string value into media bus format value, and deduplicate the code in panel-lvds.c and lvds-codec.c . Signed-off-by: Marek Vasut Cc: Laurent Pinchart Cc: Sam Ravnborg To: dri-devel@lists.freedesktop.org Signed-off-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20211012224252.29185-1-marex@denx.de

drm/bridge: Add a function to abstract away panels

2021-09-14T08:39:01+00:00

Display drivers so far need to have a lot of boilerplate to first retrieve either the panel or bridge that they are connected to using drm_of_find_panel_or_bridge(), and then either deal with each with ad-hoc functions or create a drm panel bridge through drm_panel_bridge_add. In order to reduce the boilerplate and hopefully create a path of least resistance towards using the DRM panel bridge layer, let's create the function devm_drm_of_get_bridge() to reduce that boilerplate. Signed-off-by: Maxime Ripard Reviewed-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20210910130941.1740182-2-maxime@cerno.tech

drm/of: free the iterator object on failure

2021-07-15T09:54:04+00:00

When bailing out due to the sanity check the iterator value needs to be freed because the early return prevents for_each_child_of_node() from doing the dereference itself. Fixes: 6529007522de ("drm: of: Add drm_of_lvds_get_dual_link_pixel_order") Signed-off-by: Steven Price Reviewed-by: Laurent Pinchart Link: https://patchwork.freedesktop.org/patch/msgid/20210714143300.20632-1-steven.price@arm.com