drm/i915: clear up backlight #define confusion on gen4+
- Regroup definitions for BLC_PWM_CTL so that they're all together and and ordered according to the bitfields. - Add all missing definitions for BLC_PWM_CTL2. - Use the BLM_ (for backlight modulation) prefix consistently. - Note that combination mode (i.e. also taking the legacy backlight control value from pci config space into account) is gen4 only. - Move the new registers for PCH-split machines up, they're an almost match for the gen4 defitions. Prefix the special PCH-only bits with BLM_PCH_. Also add the pipe C select bit for ivb. - Rip out the second pair of PCH polarity definitions - they're only valid on early (pre-production) ilk silicon. - Adapt the existing code to use the new definitions. This has the nice benefit of killing a magic (1 << 30) left behind be Jesse Barnes. No functional changes in this patch. Reviewed-by: NEugeni Dodonov <eugeni.dodonov@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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