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()

Changes in v15:
-- concise dp_parser_misc()

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/516096/
Link: https://lore.kernel.org/r/1672163103-31254-4-git-send-email-quic_khsieh@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c b/drivers/gpu/drm/msm/dp/dp_parser.c
index dcbe893..169023e 100644 (file)
--- a/drivers/gpu/drm/msm/dp/dp_parser.c
+++ b/drivers/gpu/drm/msm/dp/dp_parser.c
@@ -94,16 +94,22 @@ 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) {
+               /* 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);
        }
 
-       parser->max_dp_lanes = len;
+       if (cnt > 0)
+               parser->max_dp_lanes = cnt;
+       else
+               parser->max_dp_lanes = DP_MAX_NUM_DP_LANES; /* 4 lanes */
+
        return 0;
 }