FAILED: patch "[PATCH] drm/amd/display: OLED panel backlight adjust not work with" failed to apply to 5.8-stable tree

The patch below does not apply to the 5.8-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From ec11fe3705a7d434ec3493bdaddb9b6367e7366a Mon Sep 17 00:00:00 2001
From: hersen wu <[email protected]>
Date: Mon, 22 Jun 2020 13:29:16 -0400
Subject: [PATCH] drm/amd/display: OLED panel backlight adjust not work with
external display connected

[Why]
amdgpu_dm->backlight_caps is for single eDP only. the caps are upddated for very connector. Real eDP caps will be overwritten by other external display. For OLED panel, caps->aux_support is set to 1 for OLED pnael. after external connected, caps+.aux_support is set to 0. This causes OLED backlight adjustment not work.

[How]
within update_conector_ext_caps, backlight caps will be updated only for eDP connector.

index 6f937e25a62c..9c283531e1a2 100644
@@ -2028,6 +2028,7 @@ static void update_connector_ext_caps(struct amdgpu_dm_connector *aconnector)
 	struct amdgpu_display_manager *dm;
 	struct drm_connector *conn_base;
 	struct amdgpu_device *adev;
+	struct dc_link *link = NULL;
 	static const u8 pre_computed_values[] = {
 		50, 51, 52, 53, 55, 56, 57, 58, 59, 61, 62, 63, 65, 66, 68, 69,
 		71, 72, 74, 75, 77, 79, 81, 82, 84, 86, 88, 90, 92, 94, 96, 98};

@@ -2035,6 +2036,10 @@ static void update_connector_ext_caps(struct amdgpu_dm_connector *aconnector)
 	if (!aconnector || !aconnector->dc_link)
 		return;
 
+	link = aconnector->dc_link;
+	if (link->connector_signal != SIGNAL_TYPE_EDP)
+		return;
+
 	conn_base = &aconnector->base;
 	adev = conn_base->dev->dev_private;
 	dm = &adev->dm;