• Magnus Damm's avatar
    video: sh_mobile_lcdcfb deferred io support · 8564557a
    Magnus Damm authored
    This patch adds sh_mobile_lcdcfb deferred io support for SYS panels.
    
    The LCDC hardware block managed by the sh_mobile_lcdcfb driver supports
    RGB or SYS panel configurations. SYS panels come with an external display
    controller that is resposible for refreshing the actual LCD panel. RGB
    panels are controlled directly by the LCDC and they need to be refreshed
    by the LCDC hardware.
    
    In the case of SYS panels we can save some power by configuring the LCDC
    hardware block in one-shot mode. In this one-shot mode panel refresh is
    managed by software. This works well together with deferred io since it
    allows us to stop clocks for most of the time and only enable clocks when
    we actually want to trigger an update. When there is no fbdev activity
    the clocks are kept stopped which allows us to deep sleep.
    
    The refresh rate in deferred io mode is set using platform data. The same
    platform data can also be used to disable deferred io mode.
    
    As with other deferred io frame buffers user space code should use fsync()
    on the frame buffer device to trigger an update.
    Signed-off-by: default avatarMagnus Damm <damm@igel.co.jp>
    Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
    8564557a
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