[U-Boot] [PATCH 0/17] tegra: Add display driver and LCD support for Seaboard

[Thierry Reding <thierry.reding@avionic-design.de>]

On Sat, Jul 14, 2012 at 10:03:31AM +0200, Simon Glass wrote:
> Hi Christian,
> 
> On Thu, Apr 19, 2012 at 2:41 PM, Christian Kroehnert
> <christian.kroehnert@avionic-design.de> wrote:
> > On 15.01.2012 01:47, Simon Glass wrote:
> >>
> >> 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.
> >>
> >> To improve performance two optimisations are offered:
> >>
> >> 1. The LCD frame buffer is cached, with the cache being flushed after
> >> each call puts(). 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. This requires a new CONFIG
> >> and a change to the console_scrollup() function.
> >>
> >>
> >> Mayuresh Kulkarni (1):
> >>    tegra: Enable display/lcd support on Seaboard
> >>
> >> Simon Glass (15):
> >>    fdt: Add function to look up a phandle's register address
> >>    fdt: Add header guard to fdtdec.h
> >>    fdt: Correct GPIO name access in fdtdec
> >>    tegra: Add display support to funcmux
> >>    tegra: fdt: Add LCD definitions for Tegra
> >>    tegra: Add support for PWFM
> >>    tegra: Add LCD driver
> >>    tegra: Add LCD support to Nvidia boards
> >>    arm: Add control over cachability of memory regions
> >>    lcd: Add CONFIG_ALIGN_LCD_TO_SECTION to align lcd for MMU
> >>    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             |  271 +++++++++++
> >>   arch/arm/cpu/armv7/tegra2/funcmux.c             |   39 ++
> >>   arch/arm/cpu/armv7/tegra2/pwfm.c                |   40 ++
> >>   arch/arm/dts/tegra20.dtsi                       |   25 +
> >>   arch/arm/include/asm/arch-tegra2/dc.h           |  544
> >> +++++++++++++++++++++++
> >>   arch/arm/include/asm/arch-tegra2/display.h      |  133 ++++++
> >>   arch/arm/include/asm/arch-tegra2/pwfm.h         |   54 +++
> >>   arch/arm/include/asm/system.h                   |   30 ++
> >>   arch/arm/lib/cache-cp15.c                       |   62 +++-
> >>   board/nvidia/common/board.c                     |   21 +-
> >>   board/nvidia/dts/tegra2-seaboard.dts            |   21 +
> >>   common/cmd_echo.c                               |    3 +-
> >>   common/lcd.c                                    |   85 +++-
> >>   doc/device-tree-bindings/video/nvidia-video.txt |   92 ++++
> >>   drivers/video/Makefile                          |    1 +
> >>   drivers/video/tegra.c                           |  388 ++++++++++++++++
> >>   include/configs/seaboard.h                      |   12 +-
> >>   include/configs/tegra2-common.h                 |    1 +
> >>   include/fdtdec.h                                |   17 +
> >>   include/lcd.h                                   |   11 +
> >>   lib/fdtdec.c                                    |   15 +-
> >>   24 files changed, 1862 insertions(+), 31 deletions(-)
> >>   create mode 100644 arch/arm/cpu/armv7/tegra2/display.c
> >>   create mode 100644 arch/arm/cpu/armv7/tegra2/pwfm.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/pwfm.h
> >>   create mode 100644 doc/device-tree-bindings/video/nvidia-video.txt
> >>   create mode 100644 drivers/video/tegra.c
> >>
> >
> > Hi Simon,
> >
> > I have added your patch sources manually into the "Prepare v2012.04-rc1
> > release", because I got errors at apply. Also I added a device tree source
> > file for Harmony.
> >
> > I tested the device tree source file for Harmony and your patch sources on
> > our Harmony hardware and generated a new patch file:
> >
> > http://poeggi.dotsec.net/nvidia/uboot-lvds-init-patch/0001-Add-display-driver-and-LCD-support-for-Harmony-board.patch
> >
> > I hope it's all okay, this my first patch release.
> >
> > In the display.c source file I implemented a bug fix, because I get garbled
> > images on the LCD without this fix.
> 
> I see this code:
> 
> 	u32 m_value;
> 
> 	m_value = readl(0x54202e04);
> 	m_value &= ~0x2;
> 	writel(m_value, 0x54202e04);
> 
> What register are you actually writing here? I can't find it in my
> manual, but maybe I just haven't seen that address.

At the time I did look for that register as well but couldn't find
anything. But I believe that we saw the garbled display issue that
has been mentioned in another thread. If I remember correctly this
particular register write was the fix for it.

But I wasn't very much involved at the time, so maybe Christian can
clarify. However I was going to test your newest version of the LCD
patch series on our hardware and see if the issue is still there.

Thierry
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