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Message-ID: <20241205-dp_mst-v1-33-f8618d42a99a@quicinc.com>
Date: Thu, 5 Dec 2024 20:32:04 -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 33/45] drm/msm/dp: add irq hpd callback for dp mst
Add irq hpd callback for the dp mst module which shall be
invoked from the dp_display's irq hpd handler to perform
mst specific operations in case of irq hpd. In MST case, route
the IRQ HPD messages to MST module.
Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
---
drivers/gpu/drm/msm/dp/dp_display.c | 17 +++++++++++++----
drivers/gpu/drm/msm/dp/dp_mst_drm.c | 36 +++++++++++++++++++++++++++++++++++-
drivers/gpu/drm/msm/dp/dp_mst_drm.h | 2 ++
3 files changed, 50 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 60316633cc6bcfdfad8ab356d803642d353add61..97f8228042773f51f23a9d39fc009de0798059d7 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -583,7 +583,9 @@ static int msm_dp_display_usbpd_attention_cb(struct device *dev)
{
int rc = 0;
u32 sink_request;
+
struct msm_dp_display_private *dp = dev_get_dp_display_private(dev);
+ struct msm_dp *msm_dp_display = &dp->msm_dp_display;
/* check for any test request issued by sink */
rc = msm_dp_link_process_request(dp->link);
@@ -591,12 +593,18 @@ static int msm_dp_display_usbpd_attention_cb(struct device *dev)
sink_request = dp->link->sink_request;
drm_dbg_dp(dp->drm_dev, "hpd_state=%d sink_request=%d\n",
dp->hpd_state, sink_request);
- if (sink_request & DS_PORT_STATUS_CHANGED)
- rc = msm_dp_display_handle_port_status_changed(dp);
- else
+ if (sink_request & DS_PORT_STATUS_CHANGED) {
+ if (!msm_dp_display->mst_active)
+ rc = msm_dp_display_handle_port_status_changed(dp);
+ } else {
rc = msm_dp_display_handle_irq_hpd(dp);
+ }
}
+ /* let MST specific IRQ events be handled by its callback */
+ if (msm_dp_display->mst_active)
+ msm_dp_mst_display_hpd_irq(&dp->msm_dp_display);
+
return rc;
}
@@ -736,7 +744,8 @@ static int msm_dp_irq_hpd_handle(struct msm_dp_display_private *dp, u32 data)
drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
dp->msm_dp_display.connector_type, state);
- if (state == ST_MAINLINK_READY || state == ST_DISCONNECT_PENDING) {
+ if ((state == ST_MAINLINK_READY || state == ST_DISCONNECT_PENDING) &&
+ !dp->msm_dp_display.mst_active) {
/* wait until ST_CONNECTED */
msm_dp_add_event(dp, EV_IRQ_HPD_INT, 0, 1); /* delay = 1 */
mutex_unlock(&dp->event_mutex);
diff --git a/drivers/gpu/drm/msm/dp/dp_mst_drm.c b/drivers/gpu/drm/msm/dp/dp_mst_drm.c
index 2934fe6a93ff8b927b035c01b6007f3f4ec91a3f..2d92084586b466d4953429e8a6fbf766d081cb9f 100644
--- a/drivers/gpu/drm/msm/dp/dp_mst_drm.c
+++ b/drivers/gpu/drm/msm/dp/dp_mst_drm.c
@@ -559,6 +559,40 @@ static struct msm_dp_mst_bridge_state *msm_dp_mst_br_priv_state(struct drm_atomi
&bridge->obj));
}
+/* DP MST HPD IRQ callback */
+void msm_dp_mst_display_hpd_irq(struct msm_dp *dp_display)
+{
+ int rc;
+ struct msm_dp_mst *mst = dp_display->msm_dp_mst;
+ u8 ack[8] = {};
+ u8 esi[14];
+ unsigned int esi_res = DP_SINK_COUNT_ESI + 1;
+ bool handled;
+
+ rc = drm_dp_dpcd_read(mst->dp_aux, DP_SINK_COUNT_ESI,
+ esi, 14);
+ if (rc != 14) {
+ DRM_ERROR("dpcd sink status read failed, rlen=%d\n", rc);
+ return;
+ }
+
+ drm_dbg_dp(dp_display->drm_dev, "mst irq: esi1[0x%x] esi2[0x%x] esi3[%x]\n",
+ esi[1], esi[2], esi[3]);
+
+ rc = drm_dp_mst_hpd_irq_handle_event(&mst->mst_mgr, esi, ack, &handled);
+
+ /* ack the request */
+ if (handled) {
+ rc = drm_dp_dpcd_writeb(mst->dp_aux, esi_res, ack[1]);
+
+ if (rc != 1)
+ DRM_ERROR("dpcd esi_res failed. rc=%d\n", rc);
+
+ drm_dp_mst_hpd_irq_send_new_request(&mst->mst_mgr);
+ }
+ drm_dbg_dp(dp_display->drm_dev, "mst display hpd_irq handled:%d rc:%d\n", handled, rc);
+}
+
/* DP MST Connector OPs */
static int
msm_dp_mst_connector_detect(struct drm_connector *connector,
@@ -570,7 +604,7 @@ msm_dp_mst_connector_detect(struct drm_connector *connector,
struct msm_dp_mst *mst = dp_display->msm_dp_mst;
enum drm_connector_status status = connector_status_disconnected;
- if (dp_display->link_ready)
+ if (dp_display->link_ready && dp_display->mst_active)
status = drm_dp_mst_detect_port(connector,
ctx, &mst->mst_mgr, mst_conn->mst_port);
diff --git a/drivers/gpu/drm/msm/dp/dp_mst_drm.h b/drivers/gpu/drm/msm/dp/dp_mst_drm.h
index 9a8535b97193d911592b44fdfcf43ca2f252cea0..5fe5dc7596086467e9a3b3d7d04a665853fbb3d7 100644
--- a/drivers/gpu/drm/msm/dp/dp_mst_drm.h
+++ b/drivers/gpu/drm/msm/dp/dp_mst_drm.h
@@ -103,4 +103,6 @@ int msm_dp_mst_drm_bridge_init(struct msm_dp *dp, struct drm_encoder *encoder);
int msm_dp_mst_init(struct msm_dp *dp_display, u32 max_streams,
u32 max_dpcd_transaction_bytes, struct drm_dp_aux *drm_aux);
+void msm_dp_mst_display_hpd_irq(struct msm_dp *dp_display);
+
#endif /* _DP_MST_DRM_H_ */
--
2.34.1
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