[PATCH 2/3] FIXUP: FROMLIST: drm/msm/dp: return correct connection status after suspend
Kuogee Hsieh
khsieh at codeaurora.org
Tue Nov 3 22:19:52 UTC 2020
From: Stephen Boyd <swboyd at chromium.org>
During suspend, dp host controller and hpd block are disabled due to
both ahb and aux clock are disabled. Therefore hpd plug/unplug interrupts
will not be generated. At dp_pm_resume(), reinitialize both dp host
controller and hpd block so that hpd plug/unplug interrupts will be
generated and handled by driver so that hpd connection state is updated
correctly. This patch will fix link training flaky issues.
Changes in v2:
-- use container_of to cast correct dp_display_private pointer
at both dp_pm_suspend() and dp_pm_resume().
Changes in v3:
-- replace hpd_state atomic_t with u32
Changes in v4
-- call dp_display_host_deinit() at dp_pm_suspend()
-- call dp_display_host_init() at msm_dp_display_enable()
-- fix phy->init_count unbalance which causes link training failed
Signed-off-by: Kuogee Hsieh <khsieh at codeaurora.org>
(am from https://lore.kernel.org/patchwork/patch/1320895/)
(also found at https://lore.kernel.org/r/20201013233522.5222-1-khsieh@codeaurora.org)
BUG=b:166844571, b:148864048, b:170279524
TEST=On lazor, suspend with DP connected, disconnect cable, resume see
panel is gone from settings
Signed-off-by: Stephen Boyd <swboyd at chromium.org>
Change-Id: I9ff76b552ad9c671d1a75bd54bdf0ecb3a053e5c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2469808
Commit-Queue: Rob Clark <robdclark at chromium.org>
Reviewed-by: Rob Clark <robdclark at chromium.org>
---
drivers/gpu/drm/msm/dp/dp_catalog.c | 2 +-
drivers/gpu/drm/msm/dp/dp_ctrl.c | 5 ++
drivers/gpu/drm/msm/dp/dp_display.c | 83 ++++++++++++++++++-----------
3 files changed, 58 insertions(+), 32 deletions(-)
diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c
index 63c5ada34c21..4963bfe6a472 100644
--- a/drivers/gpu/drm/msm/dp/dp_catalog.c
+++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
@@ -576,7 +576,7 @@ 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;
+ u32 status;
status = dp_read_aux(catalog, REG_DP_DP_HPD_INT_STATUS);
status >>= DP_DP_HPD_STATE_STATUS_BITS_SHIFT;
diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index 7572264a7156..aa40429cad42 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
@@ -1403,6 +1403,8 @@ int dp_ctrl_host_init(struct dp_ctrl *dp_ctrl, bool flip)
void dp_ctrl_host_deinit(struct dp_ctrl *dp_ctrl)
{
struct dp_ctrl_private *ctrl;
+ struct dp_io *dp_io;
+ struct phy *phy;
if (!dp_ctrl) {
DRM_ERROR("Invalid input data\n");
@@ -1410,8 +1412,11 @@ void dp_ctrl_host_deinit(struct dp_ctrl *dp_ctrl)
}
ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
+ dp_io = &ctrl->parser->io;
+ phy = dp_io->phy;
dp_catalog_ctrl_enable_irq(ctrl->catalog, false);
+ phy_exit(phy);
DRM_DEBUG_DP("Host deinitialized successfully\n");
}
diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index d431f0ee02bf..edae497da937 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -108,7 +108,7 @@ struct dp_display_private {
/* event related only access by event thread */
struct mutex event_mutex;
wait_queue_head_t event_q;
- atomic_t hpd_state;
+ u32 hpd_state;
u32 event_pndx;
u32 event_gndx;
struct dp_event event_list[DP_EVENT_Q_MAX];
@@ -365,6 +365,20 @@ static void dp_display_host_init(struct dp_display_private *dp)
dp->core_initialized = true;
}
+static void dp_display_host_deinit(struct dp_display_private *dp)
+{
+ if (!dp->core_initialized) {
+ DRM_DEBUG_DP("DP core not initialized\n");
+ return;
+ }
+
+ dp_ctrl_host_deinit(dp->ctrl);
+ dp_aux_deinit(dp->aux);
+ dp_power_deinit(dp->power);
+
+ dp->core_initialized = false;
+}
+
static int dp_display_usbpd_configure_cb(struct device *dev)
{
int rc = 0;
@@ -489,7 +503,7 @@ static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
mutex_lock(&dp->event_mutex);
- state = atomic_read(&dp->hpd_state);
+ state = dp->hpd_state;
if (state == ST_SUSPEND_PENDING) {
mutex_unlock(&dp->event_mutex);
return 0;
@@ -507,14 +521,14 @@ static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
return 0;
}
- atomic_set(&dp->hpd_state, ST_CONNECT_PENDING);
+ dp->hpd_state = ST_CONNECT_PENDING;
hpd->hpd_high = 1;
ret = dp_display_usbpd_configure_cb(&dp->pdev->dev);
if (ret) { /* failed */
hpd->hpd_high = 0;
- atomic_set(&dp->hpd_state, ST_DISCONNECTED);
+ dp->hpd_state = ST_DISCONNECTED;
}
/* start sanity checking */
@@ -535,10 +549,10 @@ static int dp_connect_pending_timeout(struct dp_display_private *dp, u32 data)
mutex_lock(&dp->event_mutex);
- state = atomic_read(&dp->hpd_state);
+ state = dp->hpd_state;
if (state == ST_CONNECT_PENDING) {
dp_display_enable(dp, 0);
- atomic_set(&dp->hpd_state, ST_CONNECTED);
+ dp->hpd_state = ST_CONNECTED;
}
mutex_unlock(&dp->event_mutex);
@@ -571,7 +585,7 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
mutex_lock(&dp->event_mutex);
- state = atomic_read(&dp->hpd_state);
+ state = dp->hpd_state;
if (state == ST_SUSPEND_PENDING) {
mutex_unlock(&dp->event_mutex);
return 0;
@@ -589,7 +603,7 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
return 0;
}
- atomic_set(&dp->hpd_state, ST_DISCONNECT_PENDING);
+ dp->hpd_state = ST_DISCONNECT_PENDING;
/* disable HPD plug interrupt until disconnect is done */
dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_PLUG_INT_MASK
@@ -624,10 +638,10 @@ static int dp_disconnect_pending_timeout(struct dp_display_private *dp, u32 data
mutex_lock(&dp->event_mutex);
- state = atomic_read(&dp->hpd_state);
+ state = dp->hpd_state;
if (state == ST_DISCONNECT_PENDING) {
dp_display_disable(dp, 0);
- atomic_set(&dp->hpd_state, ST_DISCONNECTED);
+ dp->hpd_state = ST_DISCONNECTED;
}
mutex_unlock(&dp->event_mutex);
@@ -642,7 +656,7 @@ static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
mutex_lock(&dp->event_mutex);
/* irq_hpd can happen at either connected or disconnected state */
- state = atomic_read(&dp->hpd_state);
+ state = dp->hpd_state;
if (state == ST_SUSPEND_PENDING) {
mutex_unlock(&dp->event_mutex);
return 0;
@@ -793,11 +807,6 @@ static int dp_display_enable(struct dp_display_private *dp, u32 data)
dp_display = g_dp_display;
- if (dp_display->power_on) {
- DRM_DEBUG_DP("Link already setup, return\n");
- return 0;
- }
-
rc = dp_ctrl_on_stream(dp->ctrl);
if (!rc)
dp_display->power_on = true;
@@ -830,9 +839,6 @@ static int dp_display_disable(struct dp_display_private *dp, u32 data)
dp_display = g_dp_display;
- if (!dp_display->power_on)
- return -EINVAL;
-
/* wait only if audio was enabled */
if (dp_display->audio_enabled) {
if (!wait_for_completion_timeout(&dp->audio_comp,
@@ -1195,6 +1201,12 @@ static int dp_pm_resume(struct device *dev)
dp = container_of(dp_display, struct dp_display_private, dp_display);
+ mutex_lock(&dp->event_mutex);
+
+ /* start from disconnected state */
+ dp->hpd_state = ST_DISCONNECTED;
+
+ /* turn on dp ctrl/phy */
dp_display_host_init(dp);
dp_catalog_ctrl_hpd_config(dp->catalog);
@@ -1209,6 +1221,8 @@ static int dp_pm_resume(struct device *dev)
dp->core_initialized = false;
}
+ mutex_unlock(&dp->event_mutex);
+
return 0;
}
@@ -1220,10 +1234,14 @@ static int dp_pm_suspend(struct device *dev)
dp = container_of(dp_display, struct dp_display_private, dp_display);
- if (dp_display->power_on == true)
- dp_display_disable(dp, 0);
+ mutex_lock(&dp->event_mutex);
- atomic_set(&dp->hpd_state, ST_SUSPENDED);
+ if (dp->core_initialized == true)
+ dp_display_host_deinit(dp);
+
+ dp->hpd_state = ST_SUSPENDED;
+
+ mutex_unlock(&dp->event_mutex);
return 0;
}
@@ -1352,6 +1370,8 @@ int msm_dp_display_enable(struct msm_dp *dp, struct drm_encoder *encoder)
mutex_lock(&dp_display->event_mutex);
+ dp_del_event(dp_display, EV_CONNECT_PENDING_TIMEOUT);
+
rc = dp_display_set_mode(dp, &dp_display->dp_mode);
if (rc) {
DRM_ERROR("Failed to perform a mode set, rc=%d\n", rc);
@@ -1366,7 +1386,10 @@ int msm_dp_display_enable(struct msm_dp *dp, struct drm_encoder *encoder)
return rc;
}
- state = atomic_read(&dp_display->hpd_state);
+ state = dp_display->hpd_state;
+
+ if (state == ST_DISPLAY_OFF)
+ dp_display_host_init(dp_display);
dp_display_enable(dp_display, 0);
@@ -1377,13 +1400,11 @@ int msm_dp_display_enable(struct msm_dp *dp, struct drm_encoder *encoder)
dp_display_unprepare(dp);
}
- dp_del_event(dp_display, EV_CONNECT_PENDING_TIMEOUT);
-
if (state == ST_SUSPEND_PENDING)
dp_add_event(dp_display, EV_IRQ_HPD_INT, 0, 0);
/* completed connection */
- atomic_set(&dp_display->hpd_state, ST_CONNECTED);
+ dp_display->hpd_state = ST_CONNECTED;
mutex_unlock(&dp_display->event_mutex);
@@ -1411,20 +1432,20 @@ int msm_dp_display_disable(struct msm_dp *dp, struct drm_encoder *encoder)
mutex_lock(&dp_display->event_mutex);
+ dp_del_event(dp_display, EV_DISCONNECT_PENDING_TIMEOUT);
+
dp_display_disable(dp_display, 0);
rc = dp_display_unprepare(dp);
if (rc)
DRM_ERROR("DP display unprepare failed, rc=%d\n", rc);
- dp_del_event(dp_display, EV_DISCONNECT_PENDING_TIMEOUT);
-
- state = atomic_read(&dp_display->hpd_state);
+ state = dp_display->hpd_state;
if (state == ST_DISCONNECT_PENDING) {
/* completed disconnection */
- atomic_set(&dp_display->hpd_state, ST_DISCONNECTED);
+ dp_display->hpd_state = ST_DISCONNECTED;
} else {
- atomic_set(&dp_display->hpd_state, ST_SUSPEND_PENDING);
+ dp_display->hpd_state = ST_SUSPEND_PENDING;
}
mutex_unlock(&dp_display->event_mutex);
--
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