The goal of this patch series is to move away from hardcoding exact eDP panels in device tree files. As discussed in the various patches in this series (I'm not repeating everything here), most eDP panels are 99% probable and we can get that last 1% by allowing two "power up" delays to be specified in the device tree file and then using the panel ID (found in the EDID) to look up additional power sequencing delays for the panel. This patch series is the logical contiunation of a previous patch series where I proposed solving this problem by adding a board-specific compatible string [1]. In the discussion that followed it sounded like people were open to something like the solution proposed in this new series. In version 2 I got rid of the idea that we could have a "fallback" compatible string that we'd use if we didn't recognize the ID in the EDID. This simplifies the bindings a lot and the implementation somewhat. As a result of not having a "fallback", though, I'm not confident in transitioning any existing boards over to this since the panel will totally fail to work if we don't recognize the ID from the EDID and I can't guarantee that I've seen every panel that might have shipped on an existing product. The plan is to use "edp-panel" only on new boards or new revisions of old boards where we can guarantee that every EDID that ships out of the factory has an ID in the table. Version 2 of this series is also rebased upon my other series for the Samsung ATNA33XC20 panel [2] since they both touch the "delay" structure and it seems likely that the Samsung panel series will land first. [1] https://lore.kernel.org/r/YFKQaXOmOwYyeqvM@xxxxxxxxxx/ [2] https://lore.kernel.org/r/20210730154605.2843418-1-dianders@xxxxxxxxxxxx/ Changes in v2: - No longer allow fallback to panel-simple. - Add "-ms" suffix to delays. - Rebased atop revert of delays between GPIO & regulator - Don't support a "fallback" panel. Probed panels must be probed. - Not based on patch to copy "desc"--just allocate for probed panels. - Add "-ms" suffix to delays. Douglas Anderson (6): dt-bindings: drm/panel-simple: Introduce generic eDP panels drm/edid: Break out reading block 0 of the EDID drm/edid: Allow the querying/working with the panel ID from the EDID drm/panel-simple: Don't re-read the EDID every time we power off the panel drm/panel-simple: Split the delay structure out of the panel description drm/panel-simple: Implement generic "edp-panel"s probed by EDID .../bindings/display/panel/panel-edp.yaml | 188 ++++++++++ drivers/gpu/drm/drm_edid.c | 113 +++++- drivers/gpu/drm/panel/panel-simple.c | 352 +++++++++++++----- include/drm/drm_edid.h | 47 +++ 4 files changed, 586 insertions(+), 114 deletions(-) create mode 100644 Documentation/devicetree/bindings/display/panel/panel-edp.yaml -- 2.32.0.554.ge1b32706d8-goog
