• Tomi Valkeinen's avatar
    OMAPDSS: use DSI_FIFO_BUG workaround only for manual update displays · 3568f2a4
    Tomi Valkeinen authored
    There is a problem related to DSS FIFO thresholds and power management
    on OMAP3. It seems that when the full PM hits in, we get underflows. The
    core reason is unknown, but after experiments it looks like only
    particular FIFO thresholds work correctly.
    
    This bug is related to an earlier patch, which added special FIFO
    threshold configuration for OMAP3, because DSI command mode output
    didn't work with the normal threshold configuration.
    
    However, as the above work-around worked fine for other output types
    also, we currently always configure thresholds in this special way on
    OMAP3. In theory there should be negligible difference with this special
    way and the standard way. The first paragraph explains what happens in
    practice.
    
    This patch changes the driver to use the special threshold configuration
    only when the output is a manual update display on OMAP3. This does
    include RFBI displays also, and although it hasn't been tested (no
    boards using RFBI) I suspect the similar behaviour is present there
    also, as the DISPC side should work similarly for DSI command mode and
    RFBI.
    Signed-off-by: default avatarTomi Valkeinen <tomi.valkeinen@ti.com>
    Cc: Joe Woodward <jw@terrafix.co.uk>
    3568f2a4
apply.c 31.2 KB