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Message-ID: <dp45ml6ozghkvz2rgzj2v5xupy2zncz5gksnj5umfaldvfmgu3@lqh672yqlgl3>
Date: Sun, 8 Dec 2024 08:44:52 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc: Rob Clark <robdclark@...il.com>, 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>,
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>
Subject: Re: [PATCH 33/45] drm/msm/dp: add irq hpd callback for dp mst
On Thu, Dec 05, 2024 at 08:32:04PM -0800, Abhinav Kumar wrote:
> 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
Nit: MST, IRQ, HPD
> 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;
> +
Drop.
> 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);
Why?
> + } 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) {
Why?
> /* 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] = {};
4 should be enough
> + u8 esi[14];
> + unsigned int esi_res = DP_SINK_COUNT_ESI + 1;
inline
> + bool handled;
> +
> + rc = drm_dp_dpcd_read(mst->dp_aux, DP_SINK_COUNT_ESI,
> + esi, 14);
Why do we need 14 bytes? Other drivers read smaller chunks.
drm_dp_mst_hpd_irq_handle_event() explicitly documents just 4 bytes
there. Please consider extracting generic helper funciton that just
handles ESI read, drm_dp_mst_hpd_irq_handle_event() and writing of ACK.
> + 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)
Why is it a part of this patch?
> 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
>
--
With best wishes
Dmitry
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