linux-kernel - [PATCH v6 2/4] drm/msm/dp: parser data-lanes as property of dp

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Message-ID: <1669852310-22360-3-git-send-email-quic_khsieh@quicinc.com>
Date:   Wed, 30 Nov 2022 15:51:48 -0800
From:   Kuogee Hsieh <quic_khsieh@...cinc.com>
To:     <dri-devel@...ts.freedesktop.org>, <robdclark@...il.com>,
        <sean@...rly.run>, <swboyd@...omium.org>, <dianders@...omium.org>,
        <vkoul@...nel.org>, <daniel@...ll.ch>, <airlied@...ux.ie>,
        <agross@...nel.org>, <dmitry.baryshkov@...aro.org>,
        <bjorn.andersson@...aro.org>
CC:     Kuogee Hsieh <quic_khsieh@...cinc.com>,
        <quic_abhinavk@...cinc.com>, <quic_sbillaka@...cinc.com>,
        <freedreno@...ts.freedesktop.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v6 2/4] drm/msm/dp: parser data-lanes as property of dp_out endpoint

Add capability to parser data-lanes as property of dp_out endpoint.
Also retain the original capability to parser data-lanes as property
of mdss_dp node to handle legacy case.

Changes in v6:
-- first patch after split parser patch into two

Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
---
 drivers/gpu/drm/msm/dp/dp_parser.c | 30 +++++++++++++++++++++++-------
 1 file changed, 23 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c b/drivers/gpu/drm/msm/dp/dp_parser.c
index dd73221..b06ff60 100644
--- a/drivers/gpu/drm/msm/dp/dp_parser.c
+++ b/drivers/gpu/drm/msm/dp/dp_parser.c
@@ -94,16 +94,32 @@ static int dp_parser_ctrl_res(struct dp_parser *parser)
 static int dp_parser_misc(struct dp_parser *parser)
 {
 	struct device_node *of_node = parser->pdev->dev.of_node;
-	int len;
+	struct device_node *endpoint;
+	int cnt;
+
+	/*
+	 * legacy code, data-lanes is the property of mdss_dp node
+	 */
+	cnt = drm_of_get_data_lanes_count(of_node, 1, DP_MAX_NUM_DP_LANES);
+	if (cnt > 0) {
+		parser->max_dp_lanes = cnt;
+		return 0;
+	}
 
-	len = drm_of_get_data_lanes_count(of_node, 1, DP_MAX_NUM_DP_LANES);
-	if (len < 0) {
-		DRM_WARN("Invalid property \"data-lanes\", default max DP lanes = %d\n",
-			 DP_MAX_NUM_DP_LANES);
-		len = DP_MAX_NUM_DP_LANES;
+	/*
+	 * data-lanes is the property of dp_out endpoint
+	 */
+	endpoint = of_graph_get_endpoint_by_regs(of_node, 1, 0); /* port@1 */
+	if (endpoint) {
+		cnt = of_property_count_u32_elems(endpoint, "data-lanes");
+		if (cnt < 0)
+			parser->max_dp_lanes = DP_MAX_NUM_DP_LANES; /* 4 lanes */
+		else
+			parser->max_dp_lanes = cnt;
+	} else {
+		parser->max_dp_lanes = DP_MAX_NUM_DP_LANES; /* 4 lanes */
 	}
 
-	parser->max_dp_lanes = len;
 	return 0;
 }
 
-- 
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