drm/fbdev-helper: Explain how to debug console_lock fun
Every new KMS driver writer seems to run into this and wonder how exactly drm_fb_helper_initial_config can die doing nothing at all. Set up some big warnings signs around this newbie trap to avoid future frustration and wasting everyone's time. v2: Edits from Laurent. Cc: Carlos Palminha <CARLOS.PALMINHA@synopsys.com> Cc: Xinliang Liu <xinliang.liu@linaro.org> Cc: laurent.pinchart@ideasonboard.com Reviewed-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com> Link: http://patchwork.freedesktop.org/patch/msgid/1453449225-10954-1-git-send-email-daniel.vetter@ffwll.chSigned-off-by: NDaniel Vetter <daniel.vetter@intel.com>
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