linux-kernel - [PATCH 5.7 227/244] drm/amd/display: OLED panel backlight adjust not work with external display connected

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Message-Id: <20200720152836.649939898@linuxfoundation.org>
Date:   Mon, 20 Jul 2020 17:38:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, hersen wu <hersenxs.wu@....com>,
        Nicholas Kazlauskas <Nicholas.Kazlauskas@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 5.7 227/244] drm/amd/display: OLED panel backlight adjust not work with external display connected

From: hersen wu <hersenxs.wu@....com>

commit b448d30b0c303d5454ea572b772d1ffae96bc6e7 upstream.

[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.

Cc: stable@...r.kernel.org
Signed-off-by: hersen wu <hersenxs.wu@....com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@....com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -1804,6 +1804,7 @@ static void update_connector_ext_caps(st
 	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};
@@ -1811,6 +1812,10 @@ static void update_connector_ext_caps(st
 	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;