Changes between Version 6 and Version 7 of venice/multimedia

Timestamp:

03/22/2023 11:04:02 PM (20 months ago)

Author:

Ryan Erbstoesser

Comment:

add more software for new display

venice/multimedia

@@ -28 +28 @@
   * one-pass filter
 
-== Compatible display devices
+== Compatible Display Devices
 Display Devices:
 - [https://www.dfrobot.com/product-2193.html DFROBOT DFR0678 7" 800x480 TFT Raspberry Pi DSI Touchscreen]
@@ -35 +35 @@
   * [https://dfimg.dfrobot.com/nobody/wiki/208d6cf05cacd2ee3b349341d5bfd6e2.pdf schematics]
 
-both of these displays consist of almost identical hardware:
+Both of these displays consist of almost identical hardware:
  - STM32F103C8T6-LQFP48 Microncontroller for backlight providing a backlight enable GPIO (on/off) - there is a physical thumbwheel to adjust brightness
  - FT5316 I2C touchscreen controller without IRQ (requires a driver patch to allow 'polling' the controller); however the FT5x06 I2C runs 'through' the MCU which polls it and presents some different I2C API on the 15pin PFC I2C
@@ -86 +86 @@
 }}}
 
+== Software to Add a New Display
+
+Please note, a display of any kind needs a software driver for the chip used on the display as well as a software driver for the IMX MIPI-DSI controller. These drivers are not trivial and if a chip is on the display that doesn't have an existing driver for it, one will need datasheets and reference manuals to write the driver - this is not an easy lift and would require strong software expertise. 
+
+Please note this software effort has basically already been completed for our pre-approved and tested displays.
+
+Note for use of other displays there are several MIPI DSI bridge chips with Linux drivers listed in: 
+[https://elixir.bootlin.com/linux/latest/source/drivers/gpu/drm/bridge/Kconfig]
+
+Note that it is difficult to obtain software documentation for these chips, including the ones there so it would be wise to only try using something with a MIPI-DSI bridge chip that is already supported.
+
+See the 'Compatible Display Devices' section for an example of what it takes for a display.
+
+Example DSI overlay:
+https://github.com/Gateworks/linux-venice/blob/v5.15.15-venice/arch/arm64/boot/dts/freescale/imx8mm-venice-gw73xx-0x-rpidsi.dts
 
 [=#qt5]