[Intel-gfx] [PATCH] drm/i915/aux: clean up aux name initialization

[Jani Nikula <jani.nikula@intel.com>]

Split intel_dp_aux_name() to a separate function to declutter
intel_dp_aux_init(), and only have the if ladder to pick the one
character instead of duplicating the whole kasprintf() call.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp_aux.c | 32 ++++++++++++---------
 1 file changed, 18 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux.c b/drivers/gpu/drm/i915/display/intel_dp_aux.c
index 705915d50565..2fee5b79c0b7 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux.c
@@ -718,12 +718,27 @@ void intel_dp_aux_fini(struct intel_dp *intel_dp)
 	kfree(intel_dp->aux.name);
 }
 
-void intel_dp_aux_init(struct intel_dp *intel_dp)
+static const char *intel_dp_aux_name(struct intel_dp *intel_dp)
 {
-	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
+	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
 	struct intel_encoder *encoder = &dig_port->base;
 	enum aux_ch aux_ch = dig_port->aux_ch;
+	char aux_char;
+
+	if (DISPLAY_VER(i915) >= 13 && aux_ch >= AUX_CH_D_XELPD)
+		aux_char = aux_ch_name(aux_ch - AUX_CH_D_XELPD + AUX_CH_D);
+	else if (DISPLAY_VER(i915) >= 12 && aux_ch >= AUX_CH_USBC1)
+		aux_char = aux_ch - AUX_CH_USBC1 + '1';
+	else
+		aux_char = aux_ch_name(aux_ch);
+
+	return kasprintf(GFP_KERNEL, "AUX %c/%s", aux_char, encoder->base.name);
+}
+
+void intel_dp_aux_init(struct intel_dp *intel_dp)
+{
+	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
 
 	if (DISPLAY_VER(dev_priv) >= 14) {
 		intel_dp->aux_ch_ctl_reg = xelpdp_aux_ctl_reg;
@@ -760,18 +775,7 @@ void intel_dp_aux_init(struct intel_dp *intel_dp)
 	drm_dp_aux_init(&intel_dp->aux);
 
 	/* Failure to allocate our preferred name is not critical */
-	if (DISPLAY_VER(dev_priv) >= 13 && aux_ch >= AUX_CH_D_XELPD)
-		intel_dp->aux.name = kasprintf(GFP_KERNEL, "AUX %c/%s",
-					       aux_ch_name(aux_ch - AUX_CH_D_XELPD + AUX_CH_D),
-					       encoder->base.name);
-	else if (DISPLAY_VER(dev_priv) >= 12 && aux_ch >= AUX_CH_USBC1)
-		intel_dp->aux.name = kasprintf(GFP_KERNEL, "AUX USBC%c/%s",
-					       aux_ch - AUX_CH_USBC1 + '1',
-					       encoder->base.name);
-	else
-		intel_dp->aux.name = kasprintf(GFP_KERNEL, "AUX %c/%s",
-					       aux_ch_name(aux_ch),
-					       encoder->base.name);
+	intel_dp->aux.name = intel_dp_aux_name(intel_dp);
 
 	intel_dp->aux.transfer = intel_dp_aux_transfer;
 	cpu_latency_qos_add_request(&intel_dp->pm_qos, PM_QOS_DEFAULT_VALUE);
-- 
2.39.2