drm/i915: Add eDP support for Valleyview
Eventhough Valleyview display block is derived from Cantiga, VLV supports eDP. So, added eDP checks in i9xx_crtc_mode_set path. v2: use different DPIO_DIVISOR values for VGA, DP and eDP v3: fix DPIO value calculation to use same values for all display interfaces v4: removed unconditional enabling of 6bpc dithering based on comments from Daniel & Jani Nikula. Also changed the display enabling order to force eDP detection first. Signed-off-by: NGajanan Bhat <gajanan.bhat@intel.com> Signed-off-by: NVijay Purushothaman <vijay.a.purushothaman@intel.com> Reviewed-by: NJesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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