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drm/msm/dp: incorporate pm_runtime framework into DP driver 

Currently DP driver is executed independent of PM runtime framework.
This leads msm eDP panel can not being detected by edp_panel driver
during generic_edp_panel_probe() due to AUX DPCD read failed at
edp panel driver. Incorporate PM runtime framework into DP driver so
that host controller's power and clocks are enable/disable through
PM runtime mechanism.  Once PM runtime framework is incorporated into
DP driver, waking up device from power up path is not necessary. Hence
remove it.

After incorporating pm_runtime framework into eDP/DP driver,
dp_pm_suspend() to handle power off both DP phy and controller during
suspend and dp_pm_resume() to handle power on both DP phy and controller
during resume are not necessary. Therefore both dp_pm_suspend() and
dp_pm_resume() are dropped and replace with dp_pm_runtime_suspend() and
dp_pm_runtime_resume() respectively.

Changes in v9:
-- silent compiler warning message at dp_power_init() and dp_power_deinit()
   with W1 flag

Changes in v7:
-- add comments to dp_pm_runtime_resume()
-- add comments to dp_bridge_hpd_enable()
-- delete dp->hpd_state = ST_DISCONNECTED from dp_bridge_hpd_notify()

Changes in v6:
-- delete dp_power_client_deinit(dp->power);
-- remove if (!dp->dp_display.is_edp) condition checkout at plug_handle()
-- remove if (!dp->dp_display.is_edp) condition checkout at unplug_handle()
-- add IRQF_NO_AUTOEN to devm_request_irq()
-- add enable_irq() and disable_irq() to pm_runtime_resume()/suspend()
-- del dp->hpd_state = ST_DISCONNECTED from dp_bridge_hpd_disable()

Changes in v5:
-- remove pm_runtime_put_autosuspend feature, use pm_runtime_put_sync()
-- squash add pm_runtime_force_suspend()/resume() patch into this patch

Changes in v4:
-- reworded commit text to explain why pm_framework is required for
   edp panel
-- reworded commit text to explain autosuspend is choiced
-- delete EV_POWER_PM_GET and PM_EV_POWER_PUT from changes #3
-- delete dp_display_pm_get() and dp_display_pm_Put() from changes #3
-- return value from pm_runtime_resume_and_get() directly
-- check return value of devm_pm_runtime_enable()
-- delete pm_runtime_xxx from dp_display_remove()
-- drop dp_display_host_init() from EV_HPD_INIT_SETUP
-- drop both dp_pm_prepare() and dp_pm_compete() from this change
-- delete ST_SUSPENDED state
-- rewording commit text to add more details regrading the purpose
   of this change

Changes in v3:
-- incorporate removing pm_runtime_xx() from dp_pwer.c to this patch
-- use pm_runtime_resume_and_get() instead of pm_runtime_get()
-- error checking pm_runtime_resume_and_get() return value
-- add EV_POWER_PM_GET and PM_EV_POWER_PUT to handle HPD_GPIO case
-- replace dp_pm_suspend() with pm_runtime_force_suspend()
-- replace dp_pm_resume() with pm_runtime_force_resume()

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/570073/
Link: https://lore.kernel.org/r/1701472789-25951-6-git-send-email-quic_khsieh@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
This commit is contained in:
Kuogee Hsieh 2023-12-01 15:19:47 -08:00 committed by Dmitry Baryshkov
parent 9179fd9596
commit 5814b8bf08
4 changed files with 77 additions and 152 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/gpu/drm/msm/dp/dp_aux.c
View File

@ -291,6 +291,10 @@ static ssize_t dp_aux_transfer(struct drm_dp_aux *dp_aux,
return -EINVAL;
}
ret = pm_runtime_resume_and_get(dp_aux->dev);
if (ret)
return ret;
mutex_lock(&aux->mutex);
if (!aux->initted) {
ret = -EIO;
@ -364,6 +368,7 @@ static ssize_t dp_aux_transfer(struct drm_dp_aux *dp_aux,
exit:
mutex_unlock(&aux->mutex);
pm_runtime_put_sync(dp_aux->dev);
return ret;
}

181
drivers/gpu/drm/msm/dp/dp_display.c
View File

@ -49,7 +49,6 @@ enum {
ST_CONNECTED,
ST_DISCONNECT_PENDING,
ST_DISPLAY_OFF,
ST_SUSPENDED,
};
enum {
@ -309,10 +308,6 @@ static void dp_display_unbind(struct device *dev, struct device *master,
struct dp_display_private *dp = dev_get_dp_display_private(dev);
struct msm_drm_private *priv = dev_get_drvdata(master);
/* disable all HPD interrupts */
if (dp->core_initialized)
dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
kthread_stop(dp->ev_tsk);
of_dp_aux_depopulate_bus(dp->aux);
@ -542,6 +537,7 @@ static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
{
u32 state;
int ret;
struct platform_device *pdev = dp->dp_display.pdev;
mutex_lock(&dp->event_mutex);
@ -549,7 +545,7 @@ static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
dp->dp_display.connector_type, state);
if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
if (state == ST_DISPLAY_OFF) {
mutex_unlock(&dp->event_mutex);
return 0;
}
@ -566,7 +562,13 @@ static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
return 0;
}
ret = dp_display_usbpd_configure_cb(&dp->dp_display.pdev->dev);
ret = pm_runtime_resume_and_get(&pdev->dev);
if (ret) {
DRM_ERROR("failed to pm_runtime_resume\n");
return ret;
}
ret = dp_display_usbpd_configure_cb(&pdev->dev);
if (ret) { /* link train failed */
dp->hpd_state = ST_DISCONNECTED;
} else {
@ -598,6 +600,7 @@ static void dp_display_handle_plugged_change(struct msm_dp *dp_display,
static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
{
u32 state;
struct platform_device *pdev = dp->dp_display.pdev;
mutex_lock(&dp->event_mutex);
@ -648,6 +651,7 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
dp->dp_display.connector_type, state);
/* uevent will complete disconnection part */
pm_runtime_put_sync(&pdev->dev);
mutex_unlock(&dp->event_mutex);
return 0;
}
@ -663,7 +667,7 @@ static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
dp->dp_display.connector_type, state);
if (state == ST_DISPLAY_OFF || state == ST_SUSPENDED) {
if (state == ST_DISPLAY_OFF) {
mutex_unlock(&dp->event_mutex);
return 0;
}
@ -1075,7 +1079,6 @@ static int hpd_event_thread(void *data)
switch (todo->event_id) {
case EV_HPD_INIT_SETUP:
dp_display_host_init(dp_priv);
break;
case EV_HPD_PLUG_INT:
dp_hpd_plug_handle(dp_priv, todo->data);
@ -1167,7 +1170,9 @@ static int dp_display_request_irq(struct dp_display_private *dp)
}
rc = devm_request_irq(&pdev->dev, dp->irq, dp_display_irq_handler,
IRQF_TRIGGER_HIGH, "dp_display_isr", dp);
IRQF_TRIGGER_HIGH|IRQF_NO_AUTOEN,
"dp_display_isr", dp);
if (rc < 0) {
DRM_ERROR("failed to request IRQ%u: %d\n",
dp->irq, rc);
@ -1253,6 +1258,10 @@ static int dp_display_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, &dp->dp_display);
rc = devm_pm_runtime_enable(&pdev->dev);
if (rc)
goto err;
rc = dp_display_request_irq(dp);
if (rc)
goto err;
@ -1275,115 +1284,52 @@ static void dp_display_remove(struct platform_device *pdev)
struct dp_display_private *dp = dev_get_dp_display_private(&pdev->dev);
component_del(&pdev->dev, &dp_display_comp_ops);
dp_power_client_deinit(dp->power);
dp_display_deinit_sub_modules(dp);
platform_set_drvdata(pdev, NULL);
}
static int dp_pm_resume(struct device *dev)
static int dp_pm_runtime_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct msm_dp *dp_display = platform_get_drvdata(pdev);
struct dp_display_private *dp;
int sink_count = 0;
struct dp_display_private *dp = dev_get_dp_display_private(dev);
dp = container_of(dp_display, struct dp_display_private, dp_display);
mutex_lock(&dp->event_mutex);
drm_dbg_dp(dp->drm_dev,
"Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
dp->dp_display.connector_type, dp->core_initialized,
dp->phy_initialized, dp_display->power_on);
/* start from disconnected state */
dp->hpd_state = ST_DISCONNECTED;
/* turn on dp ctrl/phy */
dp_display_host_init(dp);
if (dp_display->is_edp)
dp_catalog_ctrl_hpd_enable(dp->catalog);
if (dp_catalog_link_is_connected(dp->catalog)) {
/*
* set sink to normal operation mode -- D0
* before dpcd read
*/
dp_display_host_phy_init(dp);
dp_link_psm_config(dp->link, &dp->panel->link_info, false);
sink_count = drm_dp_read_sink_count(dp->aux);
if (sink_count < 0)
sink_count = 0;
disable_irq(dp->irq);
if (dp->dp_display.is_edp) {
dp_display_host_phy_exit(dp);
dp_catalog_ctrl_hpd_disable(dp->catalog);
}
dp->link->sink_count = sink_count;
/*
* can not declared display is connected unless
* HDMI cable is plugged in and sink_count of
* dongle become 1
* also only signal audio when disconnected
*/
if (dp->link->sink_count) {
dp->dp_display.link_ready = true;
} else {
dp->dp_display.link_ready = false;
dp_display_handle_plugged_change(dp_display, false);
}
drm_dbg_dp(dp->drm_dev,
"After, type=%d sink=%d conn=%d core_init=%d phy_init=%d power=%d\n",
dp->dp_display.connector_type, dp->link->sink_count,
dp->dp_display.link_ready, dp->core_initialized,
dp->phy_initialized, dp_display->power_on);
mutex_unlock(&dp->event_mutex);
dp_display_host_deinit(dp);
return 0;
}
static int dp_pm_suspend(struct device *dev)
static int dp_pm_runtime_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct msm_dp *dp_display = platform_get_drvdata(pdev);
struct dp_display_private *dp;
struct dp_display_private *dp = dev_get_dp_display_private(dev);
dp = container_of(dp_display, struct dp_display_private, dp_display);
mutex_lock(&dp->event_mutex);
drm_dbg_dp(dp->drm_dev,
"Before, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
dp->dp_display.connector_type, dp->core_initialized,
dp->phy_initialized, dp_display->power_on);
/* mainlink enabled */
if (dp_power_clk_status(dp->power, DP_CTRL_PM))
dp_ctrl_off_link_stream(dp->ctrl);
dp_display_host_phy_exit(dp);
/* host_init will be called at pm_resume */
dp_display_host_deinit(dp);
dp->hpd_state = ST_SUSPENDED;
drm_dbg_dp(dp->drm_dev,
"After, type=%d core_inited=%d phy_inited=%d power_on=%d\n",
dp->dp_display.connector_type, dp->core_initialized,
dp->phy_initialized, dp_display->power_on);
mutex_unlock(&dp->event_mutex);
/*
* for eDP, host cotroller, HPD block and PHY are enabled here
* but with HPD irq disabled
*
* for DP, only host controller is enabled here.
* HPD block is enabled at dp_bridge_hpd_enable()
* PHY will be enabled at plugin handler later
*/
dp_display_host_init(dp);
if (dp->dp_display.is_edp) {
dp_catalog_ctrl_hpd_enable(dp->catalog);
dp_display_host_phy_init(dp);
}
enable_irq(dp->irq);
return 0;
}
static const struct dev_pm_ops dp_pm_ops = {
.suspend = dp_pm_suspend,
.resume = dp_pm_resume,
SET_RUNTIME_PM_OPS(dp_pm_runtime_suspend, dp_pm_runtime_resume, NULL)
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
};
static struct platform_driver dp_display_driver = {
@ -1466,10 +1412,6 @@ static int dp_display_get_next_bridge(struct msm_dp *dp)
aux_bus = of_get_child_by_name(dev->of_node, "aux-bus");
if (aux_bus && dp->is_edp) {
dp_display_host_init(dp_priv);
dp_catalog_ctrl_hpd_enable(dp_priv->catalog);
dp_display_host_phy_init(dp_priv);
/*
* The code below assumes that the panel will finish probing
* by the time devm_of_dp_aux_populate_ep_devices() returns.
@ -1566,6 +1508,11 @@ void dp_bridge_atomic_enable(struct drm_bridge *drm_bridge,
dp_hpd_plug_handle(dp_display, 0);
mutex_lock(&dp_display->event_mutex);
if (pm_runtime_resume_and_get(&dp->pdev->dev)) {
DRM_ERROR("failed to pm_runtime_resume\n");
mutex_unlock(&dp_display->event_mutex);
return;
}
state = dp_display->hpd_state;
if (state != ST_DISPLAY_OFF && state != ST_MAINLINK_READY) {
@ -1630,10 +1577,9 @@ void dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
mutex_lock(&dp_display->event_mutex);
state = dp_display->hpd_state;
if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED) {
mutex_unlock(&dp_display->event_mutex);
return;
}
if (state != ST_DISCONNECT_PENDING && state != ST_CONNECTED)
drm_dbg_dp(dp->drm_dev, "type=%d wrong hpd_state=%d\n",
dp->connector_type, state);
dp_display_disable(dp_display);
@ -1646,6 +1592,8 @@ void dp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
}
drm_dbg_dp(dp->drm_dev, "type=%d Done\n", dp->connector_type);
pm_runtime_put_sync(&dp->pdev->dev);
mutex_unlock(&dp_display->event_mutex);
}
@ -1684,7 +1632,21 @@ void dp_bridge_hpd_enable(struct drm_bridge *bridge)
struct msm_dp *dp_display = dp_bridge->dp_display;
struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
/*
* this is for external DP with hpd irq enabled case,
* step-1: dp_pm_runtime_resume() enable dp host only
* step-2: enable hdp block and have hpd irq enabled here
* step-3: waiting for plugin irq while phy is not initialized
* step-4: DP PHY is initialized at plugin handler before link training
*
*/
mutex_lock(&dp->event_mutex);
if (pm_runtime_resume_and_get(&dp_display->pdev->dev)) {
DRM_ERROR("failed to resume power\n");
mutex_unlock(&dp->event_mutex);
return;
}
dp_catalog_ctrl_hpd_enable(dp->catalog);
/* enable HDP interrupts */
@ -1706,6 +1668,8 @@ void dp_bridge_hpd_disable(struct drm_bridge *bridge)
dp_catalog_ctrl_hpd_disable(dp->catalog);
dp_display->internal_hpd = false;
pm_runtime_put_sync(&dp_display->pdev->dev);
mutex_unlock(&dp->event_mutex);
}
@ -1720,11 +1684,6 @@ void dp_bridge_hpd_notify(struct drm_bridge *bridge,
if (dp_display->internal_hpd)
return;
if (!dp->core_initialized) {
drm_dbg_dp(dp->drm_dev, "not initialized\n");
return;
}
if (!dp_display->link_ready && status == connector_status_connected)
dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
else if (dp_display->link_ready && status == connector_status_disconnected)

32
drivers/gpu/drm/msm/dp/dp_power.c
View File

@ -152,45 +152,17 @@ int dp_power_client_init(struct dp_power *dp_power)
power = container_of(dp_power, struct dp_power_private, dp_power);
pm_runtime_enable(power->dev);
return dp_power_clk_init(power);
}
void dp_power_client_deinit(struct dp_power *dp_power)
{
struct dp_power_private *power;
power = container_of(dp_power, struct dp_power_private, dp_power);
pm_runtime_disable(power->dev);
}
int dp_power_init(struct dp_power *dp_power)
{
int rc = 0;
struct dp_power_private *power = NULL;
power = container_of(dp_power, struct dp_power_private, dp_power);
pm_runtime_get_sync(power->dev);
rc = dp_power_clk_enable(dp_power, DP_CORE_PM, true);
if (rc)
pm_runtime_put_sync(power->dev);
return rc;
return dp_power_clk_enable(dp_power, DP_CORE_PM, true);
}
int dp_power_deinit(struct dp_power *dp_power)
{
struct dp_power_private *power;
power = container_of(dp_power, struct dp_power_private, dp_power);
dp_power_clk_enable(dp_power, DP_CORE_PM, false);
pm_runtime_put_sync(power->dev);
return 0;
return dp_power_clk_enable(dp_power, DP_CORE_PM, false);
}
struct dp_power *dp_power_get(struct device *dev, struct dp_parser *parser)

11
drivers/gpu/drm/msm/dp/dp_power.h
View File

@ -80,17 +80,6 @@ int dp_power_clk_enable(struct dp_power *power, enum dp_pm_type pm_type,
*/
int dp_power_client_init(struct dp_power *power);
/**
* dp_power_clinet_deinit() - de-initialize clock and regulator modules
*
* @power: instance of power module
* return: 0 for success, error for failure.
*
* This API will de-initialize the DisplayPort's clocks and regulator
* modules.
*/
void dp_power_client_deinit(struct dp_power *power);
/**
* dp_power_get() - configure and get the DisplayPort power module data
*