drm_fb_helper: Preserve capability to use atomic kms
Commit 5349ef31 (drm/fb: fix FBIOGET/PUT_VSCREENINFO pixel clock handling) changed the logic of when a pixclock was valid vs invalid. The atomic kernel mode setting used by the kernel debugger relies upon the drm_fb_helper_check_var() to always return -EINVAL. Until a better solution exists, this behavior will be restored. CC: David Airlie <airlied@linux.ie> CC: Jesse Barnes <jbarnes@virtuousgeek.org> CC: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: NJason Wessel <jason.wessel@windriver.com>
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