linux-kernel - [PATCH v4 2/3] drm/msm/disp/dpu1: add helper to know if display is builtin

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Message-Id: <1669021695-4397-3-git-send-email-quic_kalyant@quicinc.com>
Date:   Mon, 21 Nov 2022 01:08:14 -0800
From:   Kalyan Thota <quic_kalyant@...cinc.com>
To:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     Kalyan Thota <quic_kalyant@...cinc.com>,
        linux-kernel@...r.kernel.org, robdclark@...omium.org,
        dianders@...omium.org, swboyd@...omium.org,
        quic_vpolimer@...cinc.com, dmitry.baryshkov@...aro.org,
        quic_abhinavk@...cinc.com
Subject: [PATCH v4 2/3] drm/msm/disp/dpu1: add helper to know if display is builtin

Since DRM encoder type for few encoders can be similar
(like eDP and DP), get the connector type for a given
encoder to differentiate between builtin and pluggable
displays.

Changes in v1:
- add connector type in the disp_info (Dmitry)
- add helper functions to know encoder type
- update commit text reflecting the change

Changes in v2:
- avoid hardcode of connector type for DSI as it may not be true (Dmitry)
- get the HPD information from encoder bridge

Changes in v3:
- use connector type instead of bridge ops in determining
connector (Dmitry)

Changes in v4:
- get type from the drm connector rather from bridge connector (Dmitry)

Signed-off-by: Kalyan Thota <quic_kalyant@...cinc.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 26 ++++++++++++++++++++++++++
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h |  6 ++++++
 2 files changed, 32 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 9c6817b..96db7fb 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -217,6 +217,32 @@ static u32 dither_matrix[DITHER_MATRIX_SZ] = {
 	15, 7, 13, 5, 3, 11, 1, 9, 12, 4, 14, 6, 0, 8, 2, 10
 };
 
+bool dpu_encoder_is_builtin(struct drm_encoder *encoder)
+{
+	struct drm_connector *connector;
+	struct drm_connector_list_iter conn_iter;
+	struct drm_device *dev = encoder->dev;
+	int type = 0;
+
+	drm_connector_list_iter_begin(dev, &conn_iter);
+	drm_for_each_connector_iter(connector, &conn_iter) {
+		if (drm_connector_has_possible_encoder(connector, encoder)) {
+			type = connector->connector_type;
+			break;
+		}
+	}
+	drm_connector_list_iter_end(&conn_iter);
+
+	switch (type) {
+	case DRM_MODE_CONNECTOR_LVDS:
+	case DRM_MODE_CONNECTOR_eDP:
+	case DRM_MODE_CONNECTOR_DSI:
+	case DRM_MODE_CONNECTOR_DPI:
+		return true;
+	default:
+		return false;
+	}
+}
 
 bool dpu_encoder_is_widebus_enabled(const struct drm_encoder *drm_enc)
 {
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
index 9e7236e..7f3d823 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.h
@@ -224,4 +224,10 @@ void dpu_encoder_cleanup_wb_job(struct drm_encoder *drm_enc,
  */
 bool dpu_encoder_is_valid_for_commit(struct drm_encoder *drm_enc);
 
+/**
+ * dpu_encoder_is_builtin - find if the encoder is of type builtin
+ * @drm_enc:    Pointer to previously created drm encoder structure
+ */
+bool dpu_encoder_is_builtin(struct drm_encoder *drm_enc);
+
 #endif /* __DPU_ENCODER_H__ */
-- 
2.7.4