* [PATCH v6] drm/msm/dp: stop event kernel thread when DP unbind
@ 2022-04-15 15:41 ` Kuogee Hsieh
0 siblings, 0 replies; 4+ messages in thread
From: Kuogee Hsieh @ 2022-04-15 15:41 UTC (permalink / raw)
To: robdclark, sean, swboyd, vkoul, daniel, airlied, agross,
dmitry.baryshkov, bjorn.andersson
Cc: quic_abhinavk, quic_aravindh, quic_khsieh, quic_sbillaka,
freedreno, dri-devel, linux-arm-msm, linux-kernel
Current DP driver implementation, event thread is kept running
after DP display is unbind. This patch fix this problem by disabling
DP irq and stop event thread to exit gracefully at dp_display_unbind().
Changes in v2:
-- start event thread at dp_display_bind()
Changes in v3:
-- disable all HDP interrupts at unbind
-- replace dp_hpd_event_setup() with dp_hpd_event_thread_start()
-- replace dp_hpd_event_stop() with dp_hpd_event_thread_stop()
-- move init_waitqueue_head(&dp->event_q) to probe()
-- move spin_lock_init(&dp->event_lock) to probe()
Changes in v4:
-- relocate both dp_display_bind() and dp_display_unbind() to bottom of file
Changes in v5:
-- cancel relocation of both dp_display_bind() and dp_display_unbind()
Changes in v5:
-- move empty event q to dp_event_thread_start()
Fixes: e91e3065a806 ("drm/msm/dp: Add DP compliance tests on Snapdragon Chipsets")
Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reported-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
---
drivers/gpu/drm/msm/dp/dp_display.c | 35 ++++++++++++++++++++++++++++-------
1 file changed, 28 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 01453db..92c9819 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -113,6 +113,7 @@ struct dp_display_private {
u32 hpd_state;
u32 event_pndx;
u32 event_gndx;
+ struct task_struct *ev_tsk;
struct dp_event event_list[DP_EVENT_Q_MAX];
spinlock_t event_lock;
@@ -230,6 +231,14 @@ void dp_display_signal_audio_complete(struct msm_dp *dp_display)
complete_all(&dp->audio_comp);
}
+static void dp_hpd_event_thread_stop(struct dp_display_private *dp_priv)
+{
+ kthread_stop(dp_priv->ev_tsk);
+
+}
+
+static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv);
+
static int dp_display_bind(struct device *dev, struct device *master,
void *data)
{
@@ -269,6 +278,7 @@ static int dp_display_bind(struct device *dev, struct device *master,
if (rc)
DRM_ERROR("Audio registration Dp failed\n");
+ rc = dp_hpd_event_thread_start(dp);
end:
return rc;
}
@@ -280,6 +290,9 @@ static void dp_display_unbind(struct device *dev, struct device *master,
struct drm_device *drm = dev_get_drvdata(master);
struct msm_drm_private *priv = drm->dev_private;
+ /* disable all HPD interrupts */
+ dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
+ dp_hpd_event_thread_stop(dp);
dp_power_client_deinit(dp->power);
dp_aux_unregister(dp->aux);
priv->dp[dp->id] = NULL;
@@ -1054,7 +1067,7 @@ static int hpd_event_thread(void *data)
dp_priv = (struct dp_display_private *)data;
- while (1) {
+ while (!kthread_should_stop()) {
if (timeout_mode) {
wait_event_timeout(dp_priv->event_q,
(dp_priv->event_pndx == dp_priv->event_gndx),
@@ -1132,12 +1145,19 @@ static int hpd_event_thread(void *data)
return 0;
}
-static void dp_hpd_event_setup(struct dp_display_private *dp_priv)
+static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv)
{
- init_waitqueue_head(&dp_priv->event_q);
- spin_lock_init(&dp_priv->event_lock);
+ /* set event q to empty */
+ dp_priv->event_gndx = 0;
+ dp_priv->event_pndx = 0;
+
+ dp_priv->ev_tsk = kthread_run(hpd_event_thread, dp_priv, "dp_hpd_handler");
+ if (IS_ERR(dp_priv->ev_tsk)) {
+ DRM_ERROR("failed to create DP event thread\n");
+ return PTR_ERR(dp_priv->ev_tsk);
+ }
- kthread_run(hpd_event_thread, dp_priv, "dp_hpd_handler");
+ return 0;
}
static irqreturn_t dp_display_irq_handler(int irq, void *dev_id)
@@ -1266,7 +1286,10 @@ static int dp_display_probe(struct platform_device *pdev)
return -EPROBE_DEFER;
}
+ /* setup event q */
mutex_init(&dp->event_mutex);
+ init_waitqueue_head(&dp->event_q);
+ spin_lock_init(&dp->event_lock);
/* Store DP audio handle inside DP display */
dp->dp_display.dp_audio = dp->audio;
@@ -1441,8 +1464,6 @@ void msm_dp_irq_postinstall(struct msm_dp *dp_display)
dp = container_of(dp_display, struct dp_display_private, dp_display);
- dp_hpd_event_setup(dp);
-
dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 100);
}
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH v6] drm/msm/dp: stop event kernel thread when DP unbind
@ 2022-04-15 15:41 ` Kuogee Hsieh
0 siblings, 0 replies; 4+ messages in thread
From: Kuogee Hsieh @ 2022-04-15 15:41 UTC (permalink / raw)
To: robdclark, sean, swboyd, vkoul, daniel, airlied, agross,
dmitry.baryshkov, bjorn.andersson
Cc: quic_sbillaka, linux-arm-msm, quic_abhinavk, dri-devel,
quic_khsieh, quic_aravindh, freedreno, linux-kernel
Current DP driver implementation, event thread is kept running
after DP display is unbind. This patch fix this problem by disabling
DP irq and stop event thread to exit gracefully at dp_display_unbind().
Changes in v2:
-- start event thread at dp_display_bind()
Changes in v3:
-- disable all HDP interrupts at unbind
-- replace dp_hpd_event_setup() with dp_hpd_event_thread_start()
-- replace dp_hpd_event_stop() with dp_hpd_event_thread_stop()
-- move init_waitqueue_head(&dp->event_q) to probe()
-- move spin_lock_init(&dp->event_lock) to probe()
Changes in v4:
-- relocate both dp_display_bind() and dp_display_unbind() to bottom of file
Changes in v5:
-- cancel relocation of both dp_display_bind() and dp_display_unbind()
Changes in v5:
-- move empty event q to dp_event_thread_start()
Fixes: e91e3065a806 ("drm/msm/dp: Add DP compliance tests on Snapdragon Chipsets")
Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reported-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
---
drivers/gpu/drm/msm/dp/dp_display.c | 35 ++++++++++++++++++++++++++++-------
1 file changed, 28 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 01453db..92c9819 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -113,6 +113,7 @@ struct dp_display_private {
u32 hpd_state;
u32 event_pndx;
u32 event_gndx;
+ struct task_struct *ev_tsk;
struct dp_event event_list[DP_EVENT_Q_MAX];
spinlock_t event_lock;
@@ -230,6 +231,14 @@ void dp_display_signal_audio_complete(struct msm_dp *dp_display)
complete_all(&dp->audio_comp);
}
+static void dp_hpd_event_thread_stop(struct dp_display_private *dp_priv)
+{
+ kthread_stop(dp_priv->ev_tsk);
+
+}
+
+static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv);
+
static int dp_display_bind(struct device *dev, struct device *master,
void *data)
{
@@ -269,6 +278,7 @@ static int dp_display_bind(struct device *dev, struct device *master,
if (rc)
DRM_ERROR("Audio registration Dp failed\n");
+ rc = dp_hpd_event_thread_start(dp);
end:
return rc;
}
@@ -280,6 +290,9 @@ static void dp_display_unbind(struct device *dev, struct device *master,
struct drm_device *drm = dev_get_drvdata(master);
struct msm_drm_private *priv = drm->dev_private;
+ /* disable all HPD interrupts */
+ dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
+ dp_hpd_event_thread_stop(dp);
dp_power_client_deinit(dp->power);
dp_aux_unregister(dp->aux);
priv->dp[dp->id] = NULL;
@@ -1054,7 +1067,7 @@ static int hpd_event_thread(void *data)
dp_priv = (struct dp_display_private *)data;
- while (1) {
+ while (!kthread_should_stop()) {
if (timeout_mode) {
wait_event_timeout(dp_priv->event_q,
(dp_priv->event_pndx == dp_priv->event_gndx),
@@ -1132,12 +1145,19 @@ static int hpd_event_thread(void *data)
return 0;
}
-static void dp_hpd_event_setup(struct dp_display_private *dp_priv)
+static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv)
{
- init_waitqueue_head(&dp_priv->event_q);
- spin_lock_init(&dp_priv->event_lock);
+ /* set event q to empty */
+ dp_priv->event_gndx = 0;
+ dp_priv->event_pndx = 0;
+
+ dp_priv->ev_tsk = kthread_run(hpd_event_thread, dp_priv, "dp_hpd_handler");
+ if (IS_ERR(dp_priv->ev_tsk)) {
+ DRM_ERROR("failed to create DP event thread\n");
+ return PTR_ERR(dp_priv->ev_tsk);
+ }
- kthread_run(hpd_event_thread, dp_priv, "dp_hpd_handler");
+ return 0;
}
static irqreturn_t dp_display_irq_handler(int irq, void *dev_id)
@@ -1266,7 +1286,10 @@ static int dp_display_probe(struct platform_device *pdev)
return -EPROBE_DEFER;
}
+ /* setup event q */
mutex_init(&dp->event_mutex);
+ init_waitqueue_head(&dp->event_q);
+ spin_lock_init(&dp->event_lock);
/* Store DP audio handle inside DP display */
dp->dp_display.dp_audio = dp->audio;
@@ -1441,8 +1464,6 @@ void msm_dp_irq_postinstall(struct msm_dp *dp_display)
dp = container_of(dp_display, struct dp_display_private, dp_display);
- dp_hpd_event_setup(dp);
-
dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 100);
}
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH v6] drm/msm/dp: stop event kernel thread when DP unbind
2022-04-15 15:41 ` Kuogee Hsieh
@ 2022-04-15 19:43 ` Stephen Boyd
-1 siblings, 0 replies; 4+ messages in thread
From: Stephen Boyd @ 2022-04-15 19:43 UTC (permalink / raw)
To: Kuogee Hsieh, agross, airlied, bjorn.andersson, daniel,
dmitry.baryshkov, robdclark, sean, vkoul
Cc: quic_abhinavk, quic_aravindh, quic_sbillaka, freedreno,
dri-devel, linux-arm-msm, linux-kernel
Quoting Kuogee Hsieh (2022-04-15 08:41:16)
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 01453db..92c9819 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -230,6 +231,14 @@ void dp_display_signal_audio_complete(struct msm_dp *dp_display)
> complete_all(&dp->audio_comp);
> }
>
> +static void dp_hpd_event_thread_stop(struct dp_display_private *dp_priv)
> +{
> + kthread_stop(dp_priv->ev_tsk);
> +
> +}
> +
> +static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv);
> +
> static int dp_display_bind(struct device *dev, struct device *master,
> void *data)
> {
> @@ -280,6 +290,9 @@ static void dp_display_unbind(struct device *dev, struct device *master,
> struct drm_device *drm = dev_get_drvdata(master);
> struct msm_drm_private *priv = drm->dev_private;
>
> + /* disable all HPD interrupts */
> + dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
> + dp_hpd_event_thread_stop(dp);
It's a one line function. How about just
kthread_stop(dp->ev_tsk)
> dp_power_client_deinit(dp->power);
> dp_aux_unregister(dp->aux);
> priv->dp[dp->id] = NULL;
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v6] drm/msm/dp: stop event kernel thread when DP unbind
@ 2022-04-15 19:43 ` Stephen Boyd
0 siblings, 0 replies; 4+ messages in thread
From: Stephen Boyd @ 2022-04-15 19:43 UTC (permalink / raw)
To: Kuogee Hsieh, agross, airlied, bjorn.andersson, daniel,
dmitry.baryshkov, robdclark, sean, vkoul
Cc: quic_sbillaka, linux-arm-msm, quic_abhinavk, dri-devel,
linux-kernel, quic_aravindh, freedreno
Quoting Kuogee Hsieh (2022-04-15 08:41:16)
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 01453db..92c9819 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -230,6 +231,14 @@ void dp_display_signal_audio_complete(struct msm_dp *dp_display)
> complete_all(&dp->audio_comp);
> }
>
> +static void dp_hpd_event_thread_stop(struct dp_display_private *dp_priv)
> +{
> + kthread_stop(dp_priv->ev_tsk);
> +
> +}
> +
> +static int dp_hpd_event_thread_start(struct dp_display_private *dp_priv);
> +
> static int dp_display_bind(struct device *dev, struct device *master,
> void *data)
> {
> @@ -280,6 +290,9 @@ static void dp_display_unbind(struct device *dev, struct device *master,
> struct drm_device *drm = dev_get_drvdata(master);
> struct msm_drm_private *priv = drm->dev_private;
>
> + /* disable all HPD interrupts */
> + dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
> + dp_hpd_event_thread_stop(dp);
It's a one line function. How about just
kthread_stop(dp->ev_tsk)
> dp_power_client_deinit(dp->power);
> dp_aux_unregister(dp->aux);
> priv->dp[dp->id] = NULL;
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2022-04-15 19:43 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2022-04-15 15:41 [PATCH v6] drm/msm/dp: stop event kernel thread when DP unbind Kuogee Hsieh
2022-04-15 15:41 ` Kuogee Hsieh
2022-04-15 19:43 ` Stephen Boyd
2022-04-15 19:43 ` Stephen Boyd
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