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.
As reported by Stephen Warren: there is one problem with this serial. The display works fine for cold boot, or hitting the physical reset button, but when I execute "reset" at the U-Boot prompt, or "reboot" within Linux, the display is messed up; it looks like the LCD isn't able to sync to the timings sent by the display controller or something similar.
Changes in v5: - Update Tegra PWM binding s/duty cycle/period/ - Make all Tegra LCD fdt nodes disabled by default - Enable required LCD fdt nodes (which are now disabled by default) - Fix CONFIG_CONSOLE_SCROLL_LINES commit title - Fix misleading comments in common/lcd.c
Changes in v4: - Moved panel information into panel node (was in rgb node) - Remove LCD frame buffer address property hack - Add CONFIG_PWM_TEGRA to control inclusion of PWM support - Add a little more debugging to the PWM driver - Move code to set up PWM into the PWM commit - Rebase on top of new tegra common directory structure - Adjust fdt binding according to Thierry and Stephen's comments - Remove LCD frame buffer address property hack - Rebase on top of new tegra common directory structure - Change LCD panel GPIOs to be entirely optional - Only indicate that LCD init is complete when all stages complete - Change order of LCD init so that PWM comes first - Use system bit values for enum dcache_option instead of arbitrary numbers - Remove system.h header which is included anyway by most archs - Use lcd_puts() for echoing user input so lcd cached data is flushed - Adjust LCD fdt nodes for new binding - Remove LCD frame buffer address property hack - Use CONFIG_CONSOLE_SCROLL_LINES instead of CONSOLE_SCROLL_LINES - Put default CONFIG_CONSOLE_SCROLL_LINES at top of file - Add CONFIG_BOARD_LATE_INIT to enable LCD - Use CONFIG_CONSOLE_SCROLL_LINES instead of CONSOLE_SCROLL_LINES - Enable separate CONFIG_PWM_TEGRA option
Changes in v3: - Remove LPW1 pin which is not needed by display - Add new commit for pwm binding and node - Use displaymode binding for fdt - Bring in proposed tegra display controller binding - Add new panel binding to fit with tegra display controller binding - Rename pwfm driver to pwm - Use new proposed upstream pwm binding - Decode fdt node within the pwm driver - Introduce concept of a pwm channel, rather than separate peripherals - Separate display driver and LCD driver more in fdt - Add probe function to read in fdt parameters in display driver - Move some fdt decode code from LCD driver to SOC display driver - Rename fdt config structures - Use new pwm binding from pre-linux-next - Adjust LCD driver to use new SOC display driver structures - Add separate call to pwm_init() in board_init() - Put the LCD cache flush logic back into lcd_puts() - Handle a cached frame buffer out of normal U-Boot memory - Use new upstream proposed LCD definitions - Fix tiny bug in mult-line lcd scrolling
Changes in v2: - Add new patch to use const in pinmux_config_pingroup/table() - Use const where possible in funcmux - Add nvidia prefix to device tree properties - Update LCD driver to deal with new fdt bindings - Use a more generic config CONFIG_LCD_ALIGNMENT for lcd alignment - Put the LCD cache flush logic into lcd_putc() instead of lcd_puts() - Align tegra display using new CONFIG_LCD_ALIGNMENT feature - Update seaboard LCD definitions for new fdt binding
Mayuresh Kulkarni (1): tegra: Enable display/lcd support on Seaboard
Simon Glass (14): 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 CONFIG_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/tegra20/Makefile | 2 + arch/arm/cpu/armv7/tegra20/display.c | 409 ++++++++++++++++++ arch/arm/cpu/armv7/tegra20/pwm.c | 101 +++++ arch/arm/cpu/tegra20-common/funcmux.c | 37 ++ arch/arm/cpu/tegra20-common/pinmux.c | 4 +- arch/arm/dts/tegra20.dtsi | 105 +++++ arch/arm/include/asm/arch-tegra20/dc.h | 545 ++++++++++++++++++++++++ arch/arm/include/asm/arch-tegra20/display.h | 152 +++++++ arch/arm/include/asm/arch-tegra20/pinmux.h | 4 +- arch/arm/include/asm/arch-tegra20/pwm.h | 75 ++++ arch/arm/include/asm/system.h | 30 ++ arch/arm/lib/cache-cp15.c | 50 ++- board/nvidia/common/board.c | 26 ++- board/nvidia/dts/tegra20-seaboard.dts | 33 ++ common/lcd.c | 89 ++++- common/main.c | 12 +- 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 | 84 ++++ drivers/video/Makefile | 1 + drivers/video/tegra.c | 372 ++++++++++++++++ include/configs/seaboard.h | 13 +- include/configs/tegra20-common.h | 3 + include/fdtdec.h | 2 + include/lcd.h | 11 + lib/fdtdec.c | 2 + 28 files changed, 2212 insertions(+), 37 deletions(-) create mode 100644 arch/arm/cpu/armv7/tegra20/display.c create mode 100644 arch/arm/cpu/armv7/tegra20/pwm.c create mode 100644 arch/arm/include/asm/arch-tegra20/dc.h create mode 100644 arch/arm/include/asm/arch-tegra20/display.h create mode 100644 arch/arm/include/asm/arch-tegra20/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