Eric Lee / smarc-fsl-linux-kernel

13 Mar, 2010

3 commits

  • b32bfc384   broadsheetfb: support storing waveform ... Browse Code »

    This patch adds waveform storing capability to broadsheetfb. It uses the
    firmware class to retrieve the waveform, and the request to initiate the
    waveform storing is done via a driver sysfs entry, loadstore_waveform.

    Broadsheet is a framebuffer device. It is slightly different from a
    typical framebuffer controller that drives a normal TFT-LCD display. Most
    E-Ink display panels require a waveform in order to function. That is, in
    order to drive the state of a pixel to black, gray, or white, a specific
    waveform is utilized. Basically, that waveform represents the specific
    E-field wiggling needed to get the pixel to its optimal state given
    current temperature, and its previous state. TN/IPS-LCDs use a similar
    concept but the driving waveform is sufficiently simple that it is
    internalized in the TFT source/gate driver.

    These E-Ink waveforms are specific to a production batch. That is, a
    batch of display films are produced, then they get characterized and a
    waveform is generated for that batch. Broadsheet, typically, is attached
    to its private SPI flash which is then flashed with this waveform.

    Users won't be able to see the waveform and typically won't ever need to
    know about it. If however, the display panel attached to broadsheet is
    changed out, then they will need to update their waveform. That would
    typically be done at a factory or repair facility rather than by a user.

    [akpm@linux-foundation.org: fix printk warning]
    Signed-off-by: Jaya Kumar
    Cc: Geert Uytterhoeven
    Cc: Krzysztof Helt
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jaya Kumar
     
  • 2afb18981   broadsheetfb: add MMIO hooks ... Browse Code »

    Allow boards with GP-MMIO controllers to provide hooks to broadsheetfb in
    order to offload cmd/data writes and data reads instead of relying only on
    host based GPIO wiggling.

    Signed-off-by: Jaya Kumar
    Cc: Geert Uytterhoeven
    Cc: Krzysztof Helt
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jaya Kumar
     
  • c1c341a06   broadsheetfb: add multiple panel type support ... Browse Code »

    Update broadsheetfb to add support for multiple panel types. The 3.7" and
    6" are known to work but the 9.7" is untested due to lack of hardware.

    Signed-off-by: Jaya Kumar
    Cc: Geert Uytterhoeven
    Cc: Krzysztof Helt
    Cc: Russell King
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Jaya Kumar
     

10 Feb, 2009

1 commit