linux-kernel - [PATCH v14 3/5] drm/msm/dp: parse data-lanes as property of dp

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Date:   Fri, 16 Dec 2022 11:11:31 -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>, <agross@...nel.org>,
        <dmitry.baryshkov@...aro.org>, <andersson@...nel.org>,
        <konrad.dybcio@...ainline.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <devicetree@...r.kernel.org>,
        <airlied@...il.com>
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 v14 3/5] drm/msm/dp: parse 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

Changes in v7:
-- check "data-lanes" from endpoint first

Changes in v14:
-- replace "parser" with "parse" at commit subject
-- add matching brackets at dp_parser_misc()

Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/gpu/drm/msm/dp/dp_parser.c | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c b/drivers/gpu/drm/msm/dp/dp_parser.c
index dd73221..d42987a 100644
--- a/drivers/gpu/drm/msm/dp/dp_parser.c
+++ b/drivers/gpu/drm/msm/dp/dp_parser.c
@@ -94,16 +94,25 @@ 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;
-
-	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;
+	int cnt;
+
+	/*
+	 * data-lanes is the property of dp_out endpoint
+	 */
+	cnt = drm_of_get_data_lanes_count_ep(of_node, 1, 0, 1, DP_MAX_NUM_DP_LANES);
+	if (cnt > 0) {
+		parser->max_dp_lanes = cnt;
+	} else {
+		/*
+		 * 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;
+		else
+			parser->max_dp_lanes = DP_MAX_NUM_DP_LANES; /* 4 lanes */
 	}
 
-	parser->max_dp_lanes = len;
 	return 0;
 }
 
-- 
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