drm/i915: Code cleanup to use dev_priv and INTEL_GEN

Replace dev with dev_priv and INTEL_INFO with INTEL_GEN

v1:
* Rebased on drm-nightly (Jani Nikula)
* Separated from the link training patch series

Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1475019413-19811-1-git-send-email-manasi.d.navare@intel.com

drivers/gpu/drm/i915/intel_dp.c

@@ -1297,10 +1297,10 @@ intel_dp_sink_rates(struct intel_dp *intel_dp, const int **sink_rates)
 bool intel_dp_source_supports_hbr2(struct intel_dp *intel_dp)
 {
 	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
-	struct drm_device *dev = dig_port->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
 
-	if ((IS_HASWELL(dev) && !IS_HSW_ULX(dev)) || IS_BROADWELL(dev) ||
-	    (INTEL_INFO(dev)->gen >= 9))
+	if ((IS_HASWELL(dev_priv) && !IS_HSW_ULX(dev_priv)) ||
+	    IS_BROADWELL(dev_priv) || (INTEL_GEN(dev_priv) >= 9))
 		return true;
 	else
 		return false;
@@ -1310,13 +1310,13 @@ static int
 intel_dp_source_rates(struct intel_dp *intel_dp, const int **source_rates)
 {
 	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
-	struct drm_device *dev = dig_port->base.base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
 	int size;
 
-	if (IS_BROXTON(dev)) {
+	if (IS_BROXTON(dev_priv)) {
 		*source_rates = bxt_rates;
 		size = ARRAY_SIZE(bxt_rates);
-	} else if (IS_SKYLAKE(dev) || IS_KABYLAKE(dev)) {
+	} else if (IS_SKYLAKE(dev_priv) || IS_KABYLAKE(dev_priv)) {
 		*source_rates = skl_rates;
 		size = ARRAY_SIZE(skl_rates);
 	} else {