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From: Abel Vesa <abel.vesa@linaro.org>
Date: Mon, 29 Jan 2024 15:18:57 +0200
Subject: [PATCH 4/5] drm/msm/dp: Try looking for link-frequencies into the
 port@0's endpoint first
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Message-Id: <20240129-x1e80100-display-v1-4-0d9eb8254df0@linaro.org>
References: <20240129-x1e80100-display-v1-0-0d9eb8254df0@linaro.org>
In-Reply-To: <20240129-x1e80100-display-v1-0-0d9eb8254df0@linaro.org>
To: Rob Clark <robdclark@gmail.com>, 
 Abhinav Kumar <quic_abhinavk@quicinc.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@linaro.org>, Sean Paul <sean@poorly.run>, 
 Marijn Suijten <marijn.suijten@somainline.org>, 
 David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>, 
 Maarten Lankhorst <maarten.lankhorst@linux.intel.com>, 
 Maxime Ripard <mripard@kernel.org>, Thomas Zimmermann <tzimmermann@suse.de>, 
 Rob Herring <robh+dt@kernel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, 
 Conor Dooley <conor+dt@kernel.org>, 
 Neil Armstrong <neil.armstrong@linaro.org>
Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, 
 freedreno@lists.freedesktop.org, devicetree@vger.kernel.org, 
 linux-kernel@vger.kernel.org, Abel Vesa <abel.vesa@linaro.org>

From: Abhinav Kumar <quic_abhinavk@quicinc.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@quicinc.com>
Signed-off-by: Abel Vesa <abel.vesa@linaro.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