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drm/i915: enable dip before writing data on gen4
While testing with the intel_infoframes tool on gen4, I see that when video DIP is disabled, what we write to the DATA memory is not exactly what we read back later. This regression has been introduce in commit 64a8fc0 Author: Jesse Barnes <email@example.com> Date: Thu Sep 22 11:16:00 2011 +0530 drm/i915: fix ILK+ infoframe support That commit was setting VIDEO_DIP_CTL to 0 when initializing, which caused the problem. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=43947 Cc: firstname.lastname@example.org Tested-by: Yang Guang <email@example.com> Signed-off-by: Paulo Zanoni <firstname.lastname@example.org> Reviewed-by: Eugeni Dodonov <email@example.com> [danvet: Pimped commit message by using the usual commit citation layout.] Signed-off-by: Daniel Vetter <firstname.lastname@example.org>
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