• Peter Senna Tschudin's avatar
    drm/bridge: Drivers for megachips-stdpxxxx-ge-b850v3-fw (LVDS-DP++) · fcfa0ddc
    Peter Senna Tschudin authored
    The video processing pipeline on the second output on the GE B850v3:
    
      Host -> LVDS|--(STDP4028)--|DP -> DP|--(STDP2690)--|DP++ -> Video output
    
    Each bridge has a dedicated flash containing firmware for supporting the
    custom design. The result is that in this design neither the STDP4028
    nor the STDP2690 behave as the stock bridges would. The compatible
    strings include the suffix "-ge-b850v3-fw" to make it clear that the
    driver is for the bridges with the firmware which is specific for the GE
    B850v3.
    
    The driver is powerless to control the video processing pipeline, as the
    two bridges behaves as a single one. The driver is only needed for
    telling the host about EDID / HPD, and for giving the host powers to ack
    interrupts.
    
    This driver adds one i2c_device for each bridge, but only one
    drm_bridge. This design allows the creation of a functional connector
    that is capable of reading EDID from the STDP2690 while handling
    interrupts on the STDP4028.
    
    Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
    Cc: Martyn Welch <martyn.welch@collabora.co.uk>
    Cc: Martin Donnelly <martin.donnelly@ge.com>
    Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
    Cc: Enric Balletbo i Serra <enric.balletbo@collabora.com>
    Cc: Philipp Zabel <p.zabel@pengutronix.de>
    Cc: Rob Herring <robh@kernel.org>
    Cc: Fabio Estevam <fabio.estevam@nxp.com>
    Cc: David Airlie <airlied@linux.ie>
    Cc: Thierry Reding <treding@nvidia.com>
    Cc: Thierry Reding <thierry.reding@gmail.com>
    Cc: Archit Taneja <architt@codeaurora.org>
    Cc: Enric Balletbo <enric.balletbo@collabora.com>
    Signed-off-by: default avatarPeter Senna Tschudin <peter.senna@collabora.com>
    Signed-off-by: default avatarArchit Taneja <architt@codeaurora.org>
    Link: http://patchwork.freedesktop.org/patch/msgid/ad92919f2eaff2623a551aac94cf11ef948ff9ee.1488555615.git.peter.senna@collabora.com
    fcfa0ddc
megachips-stdpxxxx-ge-b850v3-fw.c 11.1 KB