[U-Boot] [PATCH v3 0/18] tegra: Add display driver and LCD support for Seaboard

[Simon Glass]

This series adds support for the Tegra2x's display peripheral. This
supports the LCD display on Seaboard and we use this to enable console
output in U-Boot on the LCD.

Configuration is via the device tree. Proposed bindings are included
in this series, taken from pwm bindings that should be in linux-next,
a Tegra video binding that might be accepted in devicetree-discuss
and a proposed video mode binding posted to dri-devel.

While I agree EDID is convenient for machines I would prefer to provide
a user-friendly way of selecting LCD settings as well, with EDID more
as a fallback and auto-detection when available.

To improve performance two optimisations are offered:

1. The LCD frame buffer is cached, with the cache being flushed after
each newline sent to putc(), and in a few other situations. This
dramatically increases performance (around 10x). This requires a few
additions to the ARM cache support.

2. The console supports scrolling in steps of more than 1 line. This
speeds up scrolling output considerably, particularly commands like
'printenv' which display a lot of output, and particular when the
dcache is off. This requires a new CONFIG and a change to the
console_scrollup() function.

Changes in v2:
- Add new patch to use const in pinmux_config_pingroup/table()
- Add nvidia prefix to device tree properties
- Align tegra display using new CONFIG_LCD_ALIGNMENT feature
- Put the LCD cache flush logic into lcd_putc() instead of lcd_puts()
- Update LCD driver to deal with new fdt bindings
- Update seaboard LCD definitions for new fdt binding
- Use a more generic config CONFIG_LCD_ALIGNMENT for lcd alignment
- Use const where possible in funcmux

Changes in v3:
- Add new commit for pwm binding and node
- Add new panel binding to fit with tegra display controller binding
- Add probe function to read in fdt parameters in display driver
- Add separate call to pwm_init() in board_init()
- Adjust LCD driver to use new SOC display driver structures
- Bring in proposed tegra display controller binding
- Decode fdt node within the pwm driver
- Fix tiny bug in mult-line lcd scrolling
- Handle a cached frame buffer out of normal U-Boot memory
- Introduce concept of a pwm channel, rather than separate peripherals
- Move some fdt decode code from LCD driver to SOC display driver
- Put the LCD cache flush logic back into lcd_puts()
- Remove LPW1 pin which is not needed by display
- Remove spurious newline from fdtdec_get_addr() debug output
- Rename fdt config structures
- Rename pwfm driver to pwm
- Separate display driver and LCD driver more in fdt
- Tidy up fdtdec_decode_gpios() debug output
- Use displaymode binding for fdt
- Use new proposed upstream pwm binding
- Use new pwm binding from pre-linux-next
- Use new upstream proposed LCD definitions

Mayuresh Kulkarni (1):
  tegra: Enable display/lcd support on Seaboard

Simon Glass (16):
  fdt: Tidy debugging, add to fdtdec_get_int/addr()
  fdt: Add header guard to fdtdec.h
  tegra: Use const for pinmux_config_pingroup/table()
  tegra: Add display support to funcmux
  tegra: fdt: Add pwm binding and node
  tegra: fdt: Add LCD definitions for Tegra
  tegra: Add support for PWM
  tegra: Add LCD driver
  tegra: Add LCD support to Nvidia boards
  arm: Add control over cachability of memory regions
  lcd: Add CONFIG_LCD_ALIGNMENT to select frame buffer alignment
  lcd: Add support for flushing LCD fb from dcache after update
  tegra: Align LCD frame buffer to section boundary
  tegra: Support control of cache settings for LCD
  tegra: fdt: Add LCD definitions for Seaboard
  lcd: Add CONSOLE_SCROLL_LINES option to speed console

Wei Ni (1):
  tegra: Add SOC support for display/lcd

 README                                         |   16 +
 arch/arm/cpu/armv7/cache_v7.c                  |   11 +
 arch/arm/cpu/armv7/tegra2/Makefile             |    1 +
 arch/arm/cpu/armv7/tegra2/display.c            |  389 +++++++++++++++++
 arch/arm/cpu/armv7/tegra2/funcmux.c            |   38 ++
 arch/arm/cpu/armv7/tegra2/pinmux.c             |    4 +-
 arch/arm/cpu/armv7/tegra2/pwm.c                |   99 +++++
 arch/arm/dts/tegra20.dtsi                      |   96 +++++
 arch/arm/include/asm/arch-tegra2/dc.h          |  544 ++++++++++++++++++++++++
 arch/arm/include/asm/arch-tegra2/display.h     |  152 +++++++
 arch/arm/include/asm/arch-tegra2/pinmux.h      |    4 +-
 arch/arm/include/asm/arch-tegra2/pwm.h         |   75 ++++
 arch/arm/include/asm/system.h                  |   30 ++
 arch/arm/lib/cache-cp15.c                      |   62 +++-
 board/nvidia/common/board.c                    |   24 +-
 board/nvidia/dts/tegra2-seaboard.dts           |   32 ++
 common/lcd.c                                   |   86 +++-
 doc/device-tree-bindings/pwm/tegra20-pwm.txt   |   18 +
 doc/device-tree-bindings/video/displaymode.txt |   42 ++
 doc/device-tree-bindings/video/tegra20-dc.txt  |   89 ++++
 drivers/video/Makefile                         |    1 +
 drivers/video/tegra.c                          |  368 ++++++++++++++++
 include/configs/seaboard.h                     |   11 +-
 include/configs/tegra2-common.h                |    3 +
 include/fdtdec.h                               |    5 +
 include/lcd.h                                  |   11 +
 lib/fdtdec.c                                   |   29 +-
 27 files changed, 2199 insertions(+), 41 deletions(-)
 create mode 100644 arch/arm/cpu/armv7/tegra2/display.c
 create mode 100644 arch/arm/cpu/armv7/tegra2/pwm.c
 create mode 100644 arch/arm/include/asm/arch-tegra2/dc.h
 create mode 100644 arch/arm/include/asm/arch-tegra2/display.h
 create mode 100644 arch/arm/include/asm/arch-tegra2/pwm.h
 create mode 100644 doc/device-tree-bindings/pwm/tegra20-pwm.txt
 create mode 100644 doc/device-tree-bindings/video/displaymode.txt
 create mode 100644 doc/device-tree-bindings/video/tegra20-dc.txt
 create mode 100644 drivers/video/tegra.c

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1.7.7.3