linux-kernel - [PATCH 05/45] drm/msm/dp: add a helper to read mst caps for dp

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Message-ID: <20241205-dp_mst-v1-5-f8618d42a99a@quicinc.com>
Date: Thu, 5 Dec 2024 20:31:36 -0800
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Rob Clark <robdclark@...il.com>,
        Dmitry Baryshkov
	<dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten
	<marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, "Simona
 Vetter" <simona@...ll.ch>,
        Stephen Boyd <swboyd@...omium.org>,
        "Chandan
 Uddaraju" <chandanu@...eaurora.org>,
        Guenter Roeck <groeck@...omium.org>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>
CC: Vara Reddy <quic_varar@...cinc.com>, Rob Clark <robdclark@...omium.org>,
        Tanmay Shah <tanmay@...eaurora.org>, <linux-arm-msm@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <freedreno@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Jessica Zhang
	<quic_jesszhan@...cinc.com>,
        Laurent Pinchart
	<laurent.pinchart@...asonboard.com>,
        Abhinav Kumar
	<quic_abhinavk@...cinc.com>
Subject: [PATCH 05/45] drm/msm/dp: add a helper to read mst caps for
 dp_panel

Add a helper to check whether a dp_panel is mst capable.

Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
---
 drivers/gpu/drm/msm/dp/dp_aux.h   |  1 +
 drivers/gpu/drm/msm/dp/dp_panel.c | 14 ++++++++++++++
 drivers/gpu/drm/msm/dp/dp_panel.h |  1 +
 3 files changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/msm/dp/dp_aux.h b/drivers/gpu/drm/msm/dp/dp_aux.h
index 39c5b4c8596ab28d822493a6b4d479f5f786cdee..cb97a73cdd6ea74b612053bec578247a42214f23 100644
--- a/drivers/gpu/drm/msm/dp/dp_aux.h
+++ b/drivers/gpu/drm/msm/dp/dp_aux.h
@@ -8,6 +8,7 @@
 
 #include "dp_catalog.h"
 #include <drm/display/drm_dp_helper.h>
+#include <drm/display/drm_dp_mst_helper.h>
 
 int msm_dp_aux_register(struct drm_dp_aux *msm_dp_aux);
 void msm_dp_aux_unregister(struct drm_dp_aux *msm_dp_aux);
diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
index d277e9b2cbc03688976b6aa481ee724b186bab51..172de804dec445cb08ad8e3f058407f483cd6684 100644
--- a/drivers/gpu/drm/msm/dp/dp_panel.c
+++ b/drivers/gpu/drm/msm/dp/dp_panel.c
@@ -108,6 +108,20 @@ static u32 msm_dp_panel_get_supported_bpp(struct msm_dp_panel *msm_dp_panel,
 	return min_supported_bpp;
 }
 
+bool msm_dp_panel_read_mst_cap(struct msm_dp_panel *msm_dp_panel)
+{
+	struct msm_dp_panel_private *panel;
+
+	if (!msm_dp_panel) {
+		DRM_ERROR("invalid input\n");
+		return 0;
+	}
+
+	panel = container_of(msm_dp_panel, struct msm_dp_panel_private, msm_dp_panel);
+
+	return drm_dp_read_mst_cap(panel->aux, msm_dp_panel->dpcd);
+}
+
 int msm_dp_panel_read_link_caps(struct msm_dp_panel *msm_dp_panel,
 				struct drm_connector *connector)
 {
diff --git a/drivers/gpu/drm/msm/dp/dp_panel.h b/drivers/gpu/drm/msm/dp/dp_panel.h
index 7a38655c443af597c84fb78c6702b2a3ef9822ed..363b416e4cbe290f9c0e6171d6c0c5170f9fea62 100644
--- a/drivers/gpu/drm/msm/dp/dp_panel.h
+++ b/drivers/gpu/drm/msm/dp/dp_panel.h
@@ -67,6 +67,7 @@ int msm_dp_panel_get_modes(struct msm_dp_panel *msm_dp_panel,
 		struct drm_connector *connector);
 void msm_dp_panel_handle_sink_request(struct msm_dp_panel *msm_dp_panel);
 void msm_dp_panel_tpg_config(struct msm_dp_panel *msm_dp_panel, bool enable);
+bool msm_dp_panel_read_mst_cap(struct msm_dp_panel *dp_panel);
 
 /**
  * is_link_rate_valid() - validates the link rate

-- 
2.34.1