• Lyude Paul's avatar
    drm/dp: Revert "drm/dp: Introduce EDID-based quirks" · 7c553f8b
    Lyude Paul authored
    This reverts commit 0883ce81. Originally
    these quirks were added because of the issues with using the eDP
    backlight interfaces on certain laptop panels, which made it impossible
    to properly probe for DPCD backlight support without having a whitelist
    for panels that we know have working VESA backlight control interfaces
    over DPCD. As well, it should be noted it was impossible to use the
    normal sink OUI for recognizing these panels as none of them actually
    filled out their OUIs, hence needing to resort to checking EDIDs.
    
    At the time we weren't really sure why certain panels had issues with
    DPCD backlight controls, but we eventually figured out that there was a
    second interface that these problematic laptop panels actually did work
    with and advertise properly: Intel's proprietary backlight interface for
    HDR panels. So far the testing we've done hasn't brought any panels to
    light that advertise this interface and don't support it properly, which
    means we finally have a real solution to this problem.
    
    As a result, we now have no need for the force DPCD backlight quirk, and
    furthermore this also removes the need for any kind of EDID quirk
    checking in DRM. So, let's just revert it for now since we were the only
    driver using this.
    
    v3:
    * Rebase
    v2:
    * Fix indenting error picked up by checkpatch in
      intel_edp_init_connector()
    Signed-off-by: default avatarLyude Paul <lyude@redhat.com>
    Acked-by: default avatarJani Nikula <jani.nikula@intel.com>
    Cc: thaytan@noraisin.net
    Cc: Vasily Khoruzhick <anarsoul@gmail.com>
    Link: https://patchwork.freedesktop.org/patch/msgid/20210114221709.2261452-6-lyude@redhat.com
    7c553f8b
drm_dp_helper.c 83.3 KB