This patchset adds support for the LCD panel of PinePhone.
The first 3 patches are for the panel itself, and the last 2 patches are for enabling it on PinePhone.
I've tested this on PinePhone 1.0 and 1.2.
Please take a look.
thank you and regards, Ondrej Jirman
Changes in v3: - Panel driver renamed to the name of the LCD controller - Re-organize the driver slightly to more easily support more panels based on the same controller. - Add patch to enable the touchscreen to complete the LCD support on PinePhone. - Dropped the "DSI fix" patch (the driver seems to work for me without it) - Improved brightness levels handling: - PinePhone 1.0 uses default levels generated by the driver - On PinePhone 1.1 duty cycles < 20% lead to black screen, so default levels can't be used. Martijn Braam came up with a list of duty cycle values that lead to perception of linear brigtness level <-> light intensity on PinePhone 1.1 - There was some feedback on v2 about this being similar to st7701. It's only similar in name. Most of the "user commands" are different, so I opted to keep this in a new driver instead of creating st770x.
Anyone who likes to check the differences, here are datasheets:
- https://megous.com/dl/tmp/ST7703_DS_v01_20160128.pdf - https://megous.com/dl/tmp/ST7701.pdf
Changes in v2: - DT Example fix. - DT Format fix. - Raised copyright info to 2020. - Sort panel operation functions. - Sort inclusion.
-- For phone owners: --
There's an open question on how to set the backlight brightness values on post 1.0 revision phone, since lower duty cycles (< 10-20%) lead to backlight being black. It would be nice if more people can test the various backlight levels on 1.1 and 1.2 revision with this change in dts:
brightness-levels = <0 1000>; num-interpolated-steps = <1000>;
and report at what brightness level the backlight turns on. So far it seems this has a wide range. Lowest useable duty cycle for me is ~7% on 1.2 and for Martijn ~20% on 1.1.
Icenowy Zheng (4): dt-bindings: vendor-prefixes: Add Xingbangda dt-bindings: panel: Add binding for Xingbangda XBD599 panel drm: panel: Add Xingbangda XBD599 panel (ST7703 controller) arm64: dts: sun50i-a64-pinephone: Enable LCD support on PinePhone
Ondrej Jirman (1): arm64: dts: sun50i-a64-pinephone: Add touchscreen support
.../display/panel/sitronix,st7703.yaml | 63 +++ .../devicetree/bindings/vendor-prefixes.yaml | 2 + .../allwinner/sun50i-a64-pinephone-1.1.dts | 19 + .../dts/allwinner/sun50i-a64-pinephone.dtsi | 54 +++ drivers/gpu/drm/panel/Kconfig | 10 + drivers/gpu/drm/panel/Makefile | 1 + drivers/gpu/drm/panel/panel-sitronix-st7703.c | 386 ++++++++++++++++++ 7 files changed, 535 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/panel/sitronix,st7703.yaml create mode 100644 drivers/gpu/drm/panel/panel-sitronix-st7703.c