This series fixes multiple problems with the ICN6211 driver and adds support for configuration of the chip via I2C bus.
First, in the current state, the ICN6211 driver hard-codes DPI timing and clock settings specific to some unknown panel. The settings provided by panel driver are ignored. Using any other panel than the one for which this driver is currently hard-coded can lead to permanent damage of the panel (per display supplier warning, and it sure did in my case. The damage looks like multiple rows of dead pixels at the bottom of the panel, and this is not going away even after long power off time).
Much of this series thus fixes incorrect register layout, DPI timing programming, clock generation by adding actual PLL configuration code. This series also adds lane count decoding instead of using hard-coded value, and fills in a couple of registers with likely correct default values.
Second, this series adds support for I2C configuration of the ICN6211. The device can be configured either via DSI command mode or via I2C, the register layout is the same in both cases.
Since the datasheet for this device is very hard to come by, a lot of information has been salvaged from [1] and [2].
[1] https://github.com/rockchip-linux/kernel/blob/develop-4.19/drivers/gpu/drm/b... [2] https://github.com/tdjastrzebski/ICN6211-Configurator
Cc: Jagan Teki jagan@amarulasolutions.com Cc: Maxime Ripard maxime@cerno.tech Cc: Robert Foss robert.foss@linaro.org Cc: Sam Ravnborg sam@ravnborg.org Cc: Thomas Zimmermann tzimmermann@suse.de To: dri-devel@lists.freedesktop.org
Marek Vasut (12): drm: bridge: icn6211: Fix register layout drm: bridge: icn6211: Fix HFP_HSW_HBP_HI and HFP_MIN handling drm: bridge: icn6211: Add HS/VS/DE polarity handling drm: bridge: icn6211: Add DSI lane count DT property parsing drm: bridge: icn6211: Add generic DSI-to-DPI PLL configuration drm: bridge: icn6211: Use DSI burst mode without EoT and with LP command mode drm: bridge: icn6211: Disable DPI color swap drm: bridge: icn6211: Set SYS_CTRL_1 to value used in examples drm: bridge: icn6211: Implement atomic_get_input_bus_fmts drm: bridge: icn6211: Add I2C configuration support drm: bridge: icn6211: Rename ICN6211_DSI to chipone_writeb drm: bridge: icn6211: Read and validate chip IDs before configuration
drivers/gpu/drm/bridge/chipone-icn6211.c | 510 ++++++++++++++++++++--- 1 file changed, 458 insertions(+), 52 deletions(-)