Attachment 119983 Details for Bug 91393 – Make DP fast link training option as module parameter

[patch] Make DP fast link training option as module parameter

dp_flt_module_param.patch (text/plain), 2.03 KB, created by Mika Kahola on 2015-11-20 13:14:13 UTC

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Creator: Mika Kahola

Created: 2015-11-20 13:14:13 UTC

Size: 2.03 KB

patch

obsolete

>diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
>index a47e0f4..dc2d5a0 100644
>--- a/drivers/gpu/drm/i915/i915_drv.h
>+++ b/drivers/gpu/drm/i915/i915_drv.h
>@@ -2669,6 +2669,7 @@ struct i915_params {
> 	bool verbose_state_checks;
> 	bool nuclear_pageflip;
> 	int edp_vswing;
>+	bool enable_dp_flt;
> };
> extern struct i915_params i915 __read_mostly;
> 
>diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
>index 835d609..aea5d47 100644
>--- a/drivers/gpu/drm/i915/i915_params.c
>+++ b/drivers/gpu/drm/i915/i915_params.c
>@@ -56,6 +56,7 @@ struct i915_params i915 __read_mostly = {
> 	.edp_vswing = 0,
> 	.enable_guc_submission = false,
> 	.guc_log_level = -1,
>+	.enable_dp_flt = false,
> };
> 
> module_param_named(modeset, i915.modeset, int, 0400);
>@@ -202,3 +203,6 @@ MODULE_PARM_DESC(enable_guc_submission, "Enable GuC submission (default:false)")
> module_param_named(guc_log_level, i915.guc_log_level, int, 0400);
> MODULE_PARM_DESC(guc_log_level,
> 	"GuC firmware logging level (-1:disabled (default), 0-3:enabled)");
>+
>+module_param_named_unsafe(enable_dp_flt, i915.enable_dp_flt, bool, 0400);
>+MODULE_PARM_DESC(enable_dp_flt, "Enable DP fast link training (default:false)");
>diff --git a/drivers/gpu/drm/i915/intel_dp_link_training.c b/drivers/gpu/drm/i915/intel_dp_link_training.c
>index 8888793..f8b6d69 100644
>--- a/drivers/gpu/drm/i915/intel_dp_link_training.c
>+++ b/drivers/gpu/drm/i915/intel_dp_link_training.c
>@@ -85,8 +85,17 @@ static bool
> intel_dp_reset_link_train(struct intel_dp *intel_dp,
> 			uint8_t dp_train_pat)
> {
>-	if (!intel_dp->train_set_valid)
>+	if (i915.enable_dp_flt) {
>+		DRM_DEBUG_KMS("DP flt enabled, train set valid: %s\n",
>+			      intel_dp->train_set_valid ? "true" : "false");
>+
>+		if (!intel_dp->train_set_valid)
>+			memset(intel_dp->train_set, 0, sizeof(intel_dp->train_set));
>+	} else {
>+		DRM_DEBUG_KMS("DP flt disabled\n");
> 		memset(intel_dp->train_set, 0, sizeof(intel_dp->train_set));
>+	}
>+
> 	intel_dp_set_signal_levels(intel_dp);
> 	return intel_dp_set_link_train(intel_dp, dp_train_pat);
> }

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