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Subject[PATCH] drm/msm/dp: return correct connection status after suspend/resume
Date
return connection status base on hpd realtime state status

Signed-off-by: Kuogee Hsieh <khsieh@codeaurora.org>
---
drivers/gpu/drm/msm/dp/dp_catalog.c | 13 +++++++
drivers/gpu/drm/msm/dp/dp_catalog.h | 1 +
drivers/gpu/drm/msm/dp/dp_display.c | 58 ++++++++++++-----------------
drivers/gpu/drm/msm/dp/dp_reg.h | 2 +
4 files changed, 39 insertions(+), 35 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c
index b15b4ce4ba35..4f3679b7e262 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.c
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
@@ -572,6 +572,19 @@ void dp_catalog_ctrl_hpd_config(struct dp_catalog *dp_catalog)
dp_write_aux(catalog, REG_DP_DP_HPD_CTRL, DP_DP_HPD_CTRL_HPD_EN);
}

+u32 dp_catalog_hpd_get_state_status(struct dp_catalog *dp_catalog)
+{
+ struct dp_catalog_private *catalog = container_of(dp_catalog,
+ struct dp_catalog_private, dp_catalog);
+ u32 status = 0;
+
+ status = dp_read_aux(catalog, REG_DP_DP_HPD_INT_STATUS);
+ status &= DP_DP_HPD_STATE_STATUS_BITS_MASK;
+ status >>= DP_DP_HPD_STATE_STATUS_BITS_SHIFT;
+
+ return status;
+}
+
u32 dp_catalog_hpd_get_intr_status(struct dp_catalog *dp_catalog)
{
struct dp_catalog_private *catalog = container_of(dp_catalog,
diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.h b/drivers/gpu/drm/msm/dp/dp_catalog.h
index 4b7666f1fe6f..6d257dbebf29 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.h
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.h
@@ -97,6 +97,7 @@ void dp_catalog_ctrl_enable_irq(struct dp_catalog *dp_catalog, bool enable);
void dp_catalog_hpd_config_intr(struct dp_catalog *dp_catalog,
u32 intr_mask, bool en);
void dp_catalog_ctrl_hpd_config(struct dp_catalog *dp_catalog);
+u32 dp_catalog_hpd_get_state_status(struct dp_catalog *dp_catalog);
u32 dp_catalog_hpd_get_intr_status(struct dp_catalog *dp_catalog);
void dp_catalog_ctrl_phy_reset(struct dp_catalog *dp_catalog);
int dp_catalog_ctrl_update_vx_px(struct dp_catalog *dp_catalog, u8 v_level,
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index e175aa3fd3a9..1f16508d0387 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -114,8 +114,6 @@ struct dp_display_private {
struct dp_event event_list[DP_EVENT_Q_MAX];
spinlock_t event_lock;

- struct completion resume_comp;
-
struct dp_audio *audio;
};

@@ -508,9 +506,6 @@ static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
return 0;
}

- if (state == ST_SUSPENDED)
- tout = DP_TIMEOUT_NONE;
-
atomic_set(&dp->hpd_state, ST_CONNECT_PENDING);

hpd->hpd_high = 1;
@@ -798,8 +793,6 @@ static int dp_display_enable(struct dp_display_private *dp, u32 data)
if (!rc)
dp_display->power_on = true;

- /* complete resume_comp regardless it is armed or not */
- complete(&dp->resume_comp);
return rc;
}

@@ -1151,9 +1144,6 @@ static int dp_display_probe(struct platform_device *pdev)
}

mutex_init(&dp->event_mutex);
-
- init_completion(&dp->resume_comp);
-
g_dp_display = &dp->dp_display;

/* Store DP audio handle inside DP display */
@@ -1189,6 +1179,26 @@ static int dp_display_remove(struct platform_device *pdev)

static int dp_pm_resume(struct device *dev)
{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct dp_display_private *dp = platform_get_drvdata(pdev);
+ u32 status;
+
+ if (!dp) {
+ DRM_ERROR("DP driver bind failed. Invalid driver data\n");
+ return -EINVAL;
+ }
+
+ dp_display_host_init(dp);
+
+ dp_catalog_ctrl_hpd_config(dp->catalog);
+
+ status = dp_catalog_hpd_get_state_status(dp->catalog);
+
+ if (status)
+ dp->dp_display.is_connected = true;
+ else
+ dp->dp_display.is_connected = false;
+
return 0;
}

@@ -1202,6 +1212,9 @@ static int dp_pm_suspend(struct device *dev)
return -EINVAL;
}

+ if (dp->core_initialized == true)
+ dp_display_disable(dp, 0);
+
atomic_set(&dp->hpd_state, ST_SUSPENDED);

return 0;
@@ -1317,19 +1330,6 @@ int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
return 0;
}

-static int dp_display_wait4resume_done(struct dp_display_private *dp)
-{
- int ret = 0;
-
- reinit_completion(&dp->resume_comp);
- if (!wait_for_completion_timeout(&dp->resume_comp,
- WAIT_FOR_RESUME_TIMEOUT_JIFFIES)) {
- DRM_ERROR("wait4resume_done timedout\n");
- ret = -ETIMEDOUT;
- }
- return ret;
-}
-
int msm_dp_display_enable(struct msm_dp *dp, struct drm_encoder *encoder)
{
int rc = 0;
@@ -1359,14 +1359,6 @@ int msm_dp_display_enable(struct msm_dp *dp, struct drm_encoder *encoder)
}

state = atomic_read(&dp_display->hpd_state);
- if (state == ST_SUSPENDED) {
- /* start link training */
- dp_add_event(dp_display, EV_HPD_PLUG_INT, 0, 0);
- mutex_unlock(&dp_display->event_mutex);
-
- /* wait until dp interface is up */
- goto resume_done;
- }

dp_display_enable(dp_display, 0);

@@ -1388,10 +1380,6 @@ int msm_dp_display_enable(struct msm_dp *dp, struct drm_encoder *encoder)
mutex_unlock(&dp_display->event_mutex);

return rc;
-
-resume_done:
- dp_display_wait4resume_done(dp_display);
- return rc;
}

int msm_dp_display_pre_disable(struct msm_dp *dp, struct drm_encoder *encoder)
diff --git a/drivers/gpu/drm/msm/dp/dp_reg.h b/drivers/gpu/drm/msm/dp/dp_reg.h
index 43042ff90a19..268602803d9a 100644
--- a/drivers/gpu/drm/msm/dp/dp_reg.h
+++ b/drivers/gpu/drm/msm/dp/dp_reg.h
@@ -32,6 +32,8 @@
#define DP_DP_IRQ_HPD_INT_ACK (0x00000002)
#define DP_DP_HPD_REPLUG_INT_ACK (0x00000004)
#define DP_DP_HPD_UNPLUG_INT_ACK (0x00000008)
+#define DP_DP_HPD_STATE_STATUS_BITS_MASK (0x0000000F)
+#define DP_DP_HPD_STATE_STATUS_BITS_SHIFT (0x1C)

#define REG_DP_DP_HPD_INT_MASK (0x0000000C)
#define DP_DP_HPD_PLUG_INT_MASK (0x00000001)
base-commit: 3c0f462da069af12211901ddf26f7e16e6951d9b
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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