drm/i915/glk: Reuse broxton code for geminilake

Geminilake is mostly backwards compatible with broxton, so change most
of the IS_BROXTON() checks to IS_GEN9_LP(). Differences between the
platforms will be implemented in follow-up patches.

v2: Don't reuse broxton's path in intel_update_max_cdclk().
    Don't set plane count as in broxton.

v3: Rebase

v4: Include the check intel_bios_is_port_hpd_inverted().
    Commit message.

v5: Leave i915_dmc_info() out; glk's csr version != bxt's. (Rodrigo)

v6: Rebase.

v7: Convert a few mode IS_BROXTON() occurances in pps, ddi, dsi and pll
    code. (Rodrigo)

v8: Squash a couple of DDI patches with more conversions. (Rodrigo)

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1480667037-11215-2-git-send-email-ander.conselvan.de.oliveira@intel.com
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 356c662..66ab1c8 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -530,7 +530,7 @@ static u32 gen9_dc_mask(struct drm_i915_private *dev_priv)
 	u32 mask;
 
 	mask = DC_STATE_EN_UPTO_DC5;
-	if (IS_BROXTON(dev_priv))
+	if (IS_GEN9_LP(dev_priv))
 		mask |= DC_STATE_EN_DC9;
 	else
 		mask |= DC_STATE_EN_UPTO_DC6;
@@ -911,7 +911,7 @@ static void gen9_dc_off_power_well_enable(struct drm_i915_private *dev_priv,
 
 	gen9_assert_dbuf_enabled(dev_priv);
 
-	if (IS_BROXTON(dev_priv))
+	if (IS_GEN9_LP(dev_priv))
 		bxt_verify_ddi_phy_power_wells(dev_priv);
 }
 
@@ -2170,7 +2170,7 @@ static uint32_t get_allowed_dc_mask(const struct drm_i915_private *dev_priv,
 	if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) {
 		max_dc = 2;
 		mask = 0;
-	} else if (IS_BROXTON(dev_priv)) {
+	} else if (IS_GEN9_LP(dev_priv)) {
 		max_dc = 1;
 		/*
 		 * DC9 has a separate HW flow from the rest of the DC states,