From 10ebb736960cd90eeec7239da2c2b3e8c8a24ef6 Mon Sep 17 00:00:00 2001
From: Jani Nikula <jani.nikula@intel.com>
Date: Thu, 1 Feb 2018 13:03:41 +0200
Subject: [PATCH] drm/i915/dp: abstract rate array length limiting
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Git-commit: 10ebb736960cd90eeec7239da2c2b3e8c8a24ef6
Patch-mainline: v4.17-rc1
References: FATE#322643 bsc#1055900

This will be useful later on. Also move the functions around to not need
forward declarations in subsequent patches. No functional changes.

Cc: Ville Syrj채l채 <ville.syrjala@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Ville Syrj채l채 <ville.syrjala@linux.intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/40f37f08cad33234cd86337d39e823ac6e55805f.1517482774.git.jani.nikula@intel.com
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/intel_dp.c |   38 ++++++++++++++++++++++----------------
 1 file changed, 22 insertions(+), 16 deletions(-)

--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -155,6 +155,28 @@ static void intel_dp_set_sink_rates(stru
 	intel_dp->num_sink_rates = i;
 }
 
+/* Get length of rates array potentially limited by max_rate. */
+static int intel_dp_rate_limit_len(const int *rates, int len, int max_rate)
+{
+	int i;
+
+	/* Limit results by potentially reduced max rate */
+	for (i = 0; i < len; i++) {
+		if (rates[len - i - 1] <= max_rate)
+			return len - i;
+	}
+
+	return 0;
+}
+
+/* Get length of common rates array potentially limited by max_rate. */
+static int intel_dp_common_len_rate_limit(const struct intel_dp *intel_dp,
+					  int max_rate)
+{
+	return intel_dp_rate_limit_len(intel_dp->common_rates,
+				       intel_dp->num_common_rates, max_rate);
+}
+
 /* Theoretical max between source and sink */
 static int intel_dp_max_common_rate(struct intel_dp *intel_dp)
 {
@@ -326,22 +348,6 @@ static void intel_dp_set_common_rates(st
 	}
 }
 
-/* get length of common rates potentially limited by max_rate */
-static int intel_dp_common_len_rate_limit(struct intel_dp *intel_dp,
-					  int max_rate)
-{
-	const int *common_rates = intel_dp->common_rates;
-	int i, common_len = intel_dp->num_common_rates;
-
-	/* Limit results by potentially reduced max rate */
-	for (i = 0; i < common_len; i++) {
-		if (common_rates[common_len - i - 1] <= max_rate)
-			return common_len - i;
-	}
-
-	return 0;
-}
-
 static bool intel_dp_link_params_valid(struct intel_dp *intel_dp, int link_rate,
 				       uint8_t lane_count)
 {