[PATCH 06/17] drm/i915: Add support functions in debugfs for handling Displayport compliance configuration

[Todd Previte <tprevite@gmail.com>]

This patch was previously part of "[PATCH 05/10] drm/i915: Add debugfs interface
for Displayport debug  and compliance testing". Adds two support functions for
handling Displayport configuration parameters that are used for compliance
testing.

Signed-off-by: Todd Previte <tprevite@gmail.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 48 +++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index feae100..ce091c1 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3694,6 +3694,54 @@ static const struct file_operations i915_display_crc_ctl_fops = {
 	.write = display_crc_ctl_write
 };
 
+enum dp_config_param displayport_get_config_param_type(char *input_string)
+{
+	enum dp_config_param param_type = DP_CONFIG_PARAM_INVALID;
+	int i = 0;
+
+	for (i = 0; i < DP_PARAMETER_COUNT; i++) {
+		if (strncmp(input_string, dp_conf_tokens[i],
+			    strlen(dp_conf_tokens[i])) == 0) {
+			param_type = (enum dp_config_param) i;
+			break;
+		}
+	}
+	return param_type;
+}
+
+int value_for_config_param(enum dp_config_param param,
+			   char *input_string,
+			   void *output_value)
+{
+	int status = 0;
+	unsigned int *out_ptr = (unsigned int *)output_value;
+	char *index = input_string;
+
+	switch (param) {
+	case DP_CONFIG_PARAM_CONNECTOR:
+		output_value = (char *)index;
+		break;
+	case DP_CONFIG_PARAM_LINK_RATE:
+	case DP_CONFIG_PARAM_LANE_COUNT:
+	case DP_CONFIG_PARAM_VOLTAGE_SWING:
+	case DP_CONFIG_PARAM_PREEMPHASIS:
+		status = kstrtol(index, 16, (long *)out_ptr);
+		break;
+	case DP_CONFIG_PARAM_HRES:
+	case DP_CONFIG_PARAM_VRES:
+	case DP_CONFIG_PARAM_BPP:
+		status = kstrtol(index, 10, (long *)out_ptr);
+		break;
+	default:
+		/* Unhandled case */
+		status = -EINVAL;
+		*out_ptr = 0;
+		break;
+	}
+
+	return status;
+}
+
 static int displayport_config_ctl_open(struct inode *inode,
 				       struct file *file)
 {
-- 
1.9.1

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