linux-kernel - [PATCH 4/5] drm/msm/dp: Try looking for link-frequencies into the port@0's endpoint first

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Date: Mon, 29 Jan 2024 15:18:57 +0200
From: Abel Vesa <abel.vesa@...aro.org>
To: Rob Clark <robdclark@...il.com>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Abel Vesa <abel.vesa@...aro.org>
Subject: [PATCH 4/5] drm/msm/dp: Try looking for link-frequencies into the
 port@0's endpoint first

From: Abhinav Kumar <quic_abhinavk@...cinc.com>

On platforms where the endpoint used is on port@0, looking for port@1
instead results in just ignoring the max link-frequencies altogether.
Look at port@0 first, then, if not found, look for port@1.

Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
---
 drivers/gpu/drm/msm/dp/dp_parser.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c b/drivers/gpu/drm/msm/dp/dp_parser.c
index 7032dcc8842b..eec5b8b83f4b 100644
--- a/drivers/gpu/drm/msm/dp/dp_parser.c
+++ b/drivers/gpu/drm/msm/dp/dp_parser.c
@@ -97,7 +97,11 @@ static u32 dp_parser_link_frequencies(struct device_node *of_node)
 	u64 frequency = 0;
 	int cnt;
 
-	endpoint = of_graph_get_endpoint_by_regs(of_node, 1, 0); /* port@1 */
+	endpoint = of_graph_get_endpoint_by_regs(of_node, 0, 0); /* port@0 */
+
+	if (!endpoint)
+		endpoint = of_graph_get_endpoint_by_regs(of_node, 1, 0); /* port@1 */
+
 	if (!endpoint)
 		return 0;
 

-- 
2.34.1