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drm/i915: move generic hotplug code into new intel_hotplug.c file 

We have enough generic hotplug functions sprinkled all over i915_irq.c
to warrant moving them to a file of their own. This should further
underline the distinction between generic code in the new file and
platform specific hotplug and irq code that remains in i915_irq.c.

Add new intel_hpd_init_work to keep work functions static, and rename
get_port_from_pin to intel_hpd_pin_to_port while increasing its
visibility, but keep everything else the same.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jani Nikula 2015-06-18 13:06:16 +03:00 committed by Daniel Vetter
parent 10b0e9e904
commit 77913b39ad
5 changed files with 464 additions and 422 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/i915/Makefile
View File

@ -34,6 +34,7 @@ i915-y += i915_cmd_parser.o \
i915_gpu_error.o \
i915_irq.o \
i915_trace_points.o \
intel_hotplug.o \
intel_lrc.o \
intel_ringbuffer.o \
intel_uncore.o

15
drivers/gpu/drm/i915/i915_drv.c
View File

@ -541,21 +541,6 @@ bool i915_semaphore_is_enabled(struct drm_device *dev)
return true;
}
void intel_hpd_cancel_work(struct drm_i915_private *dev_priv)
{
spin_lock_irq(&dev_priv->irq_lock);
dev_priv->hotplug.long_port_mask = 0;
dev_priv->hotplug.short_port_mask = 0;
dev_priv->hotplug.event_bits = 0;
spin_unlock_irq(&dev_priv->irq_lock);
cancel_work_sync(&dev_priv->hotplug.dig_port_work);
cancel_work_sync(&dev_priv->hotplug.hotplug_work);
cancel_delayed_work_sync(&dev_priv->hotplug.reenable_work);
}
void i915_firmware_load_error_print(const char *fw_path, int err)
{
DRM_ERROR("failed to load firmware %s (%d)\n", fw_path, err);

9
drivers/gpu/drm/i915/i915_drv.h
View File

@ -2601,9 +2601,15 @@ extern unsigned long i915_mch_val(struct drm_i915_private *dev_priv);
extern unsigned long i915_gfx_val(struct drm_i915_private *dev_priv);
extern void i915_update_gfx_val(struct drm_i915_private *dev_priv);
int vlv_force_gfx_clock(struct drm_i915_private *dev_priv, bool on);
void intel_hpd_cancel_work(struct drm_i915_private *dev_priv);
void i915_firmware_load_error_print(const char *fw_path, int err);
/* intel_hotplug.c */
void intel_hpd_irq_handler(struct drm_device *dev, u32 pin_mask, u32 long_mask);
void intel_hpd_init(struct drm_i915_private *dev_priv);
void intel_hpd_init_work(struct drm_i915_private *dev_priv);
void intel_hpd_cancel_work(struct drm_i915_private *dev_priv);
enum port intel_hpd_pin_to_port(enum hpd_pin pin);
/* i915_irq.c */
void i915_queue_hangcheck(struct drm_device *dev);
__printf(3, 4)
@ -2611,7 +2617,6 @@ void i915_handle_error(struct drm_device *dev, bool wedged,
const char *fmt, ...);
extern void intel_irq_init(struct drm_i915_private *dev_priv);
extern void intel_hpd_init(struct drm_i915_private *dev_priv);
int intel_irq_install(struct drm_i915_private *dev_priv);
void intel_irq_uninstall(struct drm_i915_private *dev_priv);

409
drivers/gpu/drm/i915/i915_irq.c
View File

@ -807,125 +807,6 @@ static int i915_get_vblank_timestamp(struct drm_device *dev, int pipe,
&crtc->hwmode);
}
static bool intel_hpd_irq_event(struct drm_device *dev,
struct drm_connector *connector)
{
enum drm_connector_status old_status;
WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
old_status = connector->status;
connector->status = connector->funcs->detect(connector, false);
if (old_status == connector->status)
return false;
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
connector->base.id,
connector->name,
drm_get_connector_status_name(old_status),
drm_get_connector_status_name(connector->status));
return true;
}
static void i915_digport_work_func(struct work_struct *work)
{
struct drm_i915_private *dev_priv =
container_of(work, struct drm_i915_private, hotplug.dig_port_work);
u32 long_port_mask, short_port_mask;
struct intel_digital_port *intel_dig_port;
int i;
u32 old_bits = 0;
spin_lock_irq(&dev_priv->irq_lock);
long_port_mask = dev_priv->hotplug.long_port_mask;
dev_priv->hotplug.long_port_mask = 0;
short_port_mask = dev_priv->hotplug.short_port_mask;
dev_priv->hotplug.short_port_mask = 0;
spin_unlock_irq(&dev_priv->irq_lock);
for (i = 0; i < I915_MAX_PORTS; i++) {
bool valid = false;
bool long_hpd = false;
intel_dig_port = dev_priv->hotplug.irq_port[i];
if (!intel_dig_port || !intel_dig_port->hpd_pulse)
continue;
if (long_port_mask & (1 << i)) {
valid = true;
long_hpd = true;
} else if (short_port_mask & (1 << i))
valid = true;
if (valid) {
enum irqreturn ret;
ret = intel_dig_port->hpd_pulse(intel_dig_port, long_hpd);
if (ret == IRQ_NONE) {
/* fall back to old school hpd */
old_bits |= (1 << intel_dig_port->base.hpd_pin);
}
}
}
if (old_bits) {
spin_lock_irq(&dev_priv->irq_lock);
dev_priv->hotplug.event_bits |= old_bits;
spin_unlock_irq(&dev_priv->irq_lock);
schedule_work(&dev_priv->hotplug.hotplug_work);
}
}
/*
* Handle hotplug events outside the interrupt handler proper.
*/
static void intel_hpd_irq_storm_disable(struct drm_i915_private *dev_priv);
static void i915_hotplug_work_func(struct work_struct *work)
{
struct drm_i915_private *dev_priv =
container_of(work, struct drm_i915_private, hotplug.hotplug_work);
struct drm_device *dev = dev_priv->dev;
struct drm_mode_config *mode_config = &dev->mode_config;
struct intel_connector *intel_connector;
struct intel_encoder *intel_encoder;
struct drm_connector *connector;
bool changed = false;
u32 hpd_event_bits;
mutex_lock(&mode_config->mutex);
DRM_DEBUG_KMS("running encoder hotplug functions\n");
spin_lock_irq(&dev_priv->irq_lock);
hpd_event_bits = dev_priv->hotplug.event_bits;
dev_priv->hotplug.event_bits = 0;
/* Disable hotplug on connectors that hit an irq storm. */
intel_hpd_irq_storm_disable(dev_priv);
spin_unlock_irq(&dev_priv->irq_lock);
list_for_each_entry(connector, &mode_config->connector_list, head) {
intel_connector = to_intel_connector(connector);
if (!intel_connector->encoder)
continue;
intel_encoder = intel_connector->encoder;
if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
connector->name, intel_encoder->hpd_pin);
if (intel_encoder->hot_plug)
intel_encoder->hot_plug(intel_encoder);
if (intel_hpd_irq_event(dev, connector))
changed = true;
}
}
mutex_unlock(&mode_config->mutex);
if (changed)
drm_kms_helper_hotplug_event(dev);
}
static void ironlake_rps_change_irq_handler(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@ -1346,94 +1227,6 @@ static irqreturn_t gen8_gt_irq_handler(struct drm_i915_private *dev_priv,
return ret;
}
#define HPD_STORM_DETECT_PERIOD 1000
#define HPD_STORM_THRESHOLD 5
/**
* intel_hpd_irq_storm_detect - gather stats and detect HPD irq storm on a pin
* @dev_priv: private driver data pointer
* @pin: the pin to gather stats on
*
* Gather stats about HPD irqs from the specified @pin, and detect irq
* storms. Only the pin specific stats and state are changed, the caller is
* responsible for further action.
*
* @HPD_STORM_THRESHOLD irqs are allowed within @HPD_STORM_DETECT_PERIOD ms,
* otherwise it's considered an irq storm, and the irq state is set to
* @HPD_MARK_DISABLED.
*
* Return true if an irq storm was detected on @pin.
*/
static bool intel_hpd_irq_storm_detect(struct drm_i915_private *dev_priv,
enum hpd_pin pin)
{
unsigned long start = dev_priv->hotplug.stats[pin].last_jiffies;
unsigned long end = start + msecs_to_jiffies(HPD_STORM_DETECT_PERIOD);
bool storm = false;
if (!time_in_range(jiffies, start, end)) {
dev_priv->hotplug.stats[pin].last_jiffies = jiffies;
dev_priv->hotplug.stats[pin].count = 0;
DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: 0\n", pin);
} else if (dev_priv->hotplug.stats[pin].count > HPD_STORM_THRESHOLD) {
dev_priv->hotplug.stats[pin].state = HPD_MARK_DISABLED;
DRM_DEBUG_KMS("HPD interrupt storm detected on PIN %d\n", pin);
storm = true;
} else {
dev_priv->hotplug.stats[pin].count++;
DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: %d\n", pin,
dev_priv->hotplug.stats[pin].count);
}
return storm;
}
#define I915_REENABLE_HOTPLUG_DELAY (2*60*1000)
static void intel_hpd_irq_storm_disable(struct drm_i915_private *dev_priv)
{
struct drm_device *dev = dev_priv->dev;
struct drm_mode_config *mode_config = &dev->mode_config;
struct intel_connector *intel_connector;
struct intel_encoder *intel_encoder;
struct drm_connector *connector;
enum hpd_pin pin;
bool hpd_disabled = false;
assert_spin_locked(&dev_priv->irq_lock);
list_for_each_entry(connector, &mode_config->connector_list, head) {
if (connector->polled != DRM_CONNECTOR_POLL_HPD)
continue;
intel_connector = to_intel_connector(connector);
intel_encoder = intel_connector->encoder;
if (!intel_encoder)
continue;
pin = intel_encoder->hpd_pin;
if (pin == HPD_NONE ||
dev_priv->hotplug.stats[pin].state != HPD_MARK_DISABLED)
continue;
DRM_INFO("HPD interrupt storm detected on connector %s: "
"switching from hotplug detection to polling\n",
connector->name);
dev_priv->hotplug.stats[pin].state = HPD_DISABLED;
connector->polled = DRM_CONNECTOR_POLL_CONNECT
| DRM_CONNECTOR_POLL_DISCONNECT;
hpd_disabled = true;
}
/* Enable polling and queue hotplug re-enabling. */
if (hpd_disabled) {
drm_kms_helper_poll_enable(dev);
mod_delayed_work(system_wq, &dev_priv->hotplug.reenable_work,
msecs_to_jiffies(I915_REENABLE_HOTPLUG_DELAY));
}
}
static bool pch_port_hotplug_long_detect(enum port port, u32 val)
{
switch (port) {
@ -1462,20 +1255,6 @@ static bool i9xx_port_hotplug_long_detect(enum port port, u32 val)
}
}
static enum port get_port_from_pin(enum hpd_pin pin)
{
switch (pin) {
case HPD_PORT_B:
return PORT_B;
case HPD_PORT_C:
return PORT_C;
case HPD_PORT_D:
return PORT_D;
default:
return PORT_A; /* no hpd */
}
}
/* Get a bit mask of pins that have triggered, and which ones may be long. */
static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
u32 hotplug_trigger, u32 dig_hotplug_reg, const u32 hpd[HPD_NUM_PINS])
@ -1492,7 +1271,7 @@ static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
if (hpd[i] & hotplug_trigger) {
*pin_mask |= BIT(i);
if (pch_port_hotplug_long_detect(get_port_from_pin(i), dig_hotplug_reg))
if (pch_port_hotplug_long_detect(intel_hpd_pin_to_port(i), dig_hotplug_reg))
*long_mask |= BIT(i);
}
}
@ -1518,7 +1297,7 @@ static void i9xx_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
if (hpd[i] & hotplug_trigger) {
*pin_mask |= BIT(i);
if (i9xx_port_hotplug_long_detect(get_port_from_pin(i), hotplug_trigger))
if (i9xx_port_hotplug_long_detect(intel_hpd_pin_to_port(i), hotplug_trigger))
*long_mask |= BIT(i);
}
}
@ -1527,104 +1306,6 @@ static void i9xx_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
hotplug_trigger, *pin_mask);
}
/**
* intel_hpd_irq_handler - main hotplug irq handler
* @dev: drm device
* @pin_mask: a mask of hpd pins that have triggered the irq
* @long_mask: a mask of hpd pins that may be long hpd pulses
*
* This is the main hotplug irq handler for all platforms. The platform specific
* irq handlers call the platform specific hotplug irq handlers, which read and
* decode the appropriate registers into bitmasks about hpd pins that have
* triggered (@pin_mask), and which of those pins may be long pulses
* (@long_mask). The @long_mask is ignored if the port corresponding to the pin
* is not a digital port.
*
* Here, we do hotplug irq storm detection and mitigation, and pass further
* processing to appropriate bottom halves.
*/
static void intel_hpd_irq_handler(struct drm_device *dev,
u32 pin_mask, u32 long_mask)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int i;
enum port port;
bool storm_detected = false;
bool queue_dig = false, queue_hp = false;
bool is_dig_port;
if (!pin_mask)
return;
spin_lock(&dev_priv->irq_lock);
for_each_hpd_pin(i) {
if (!(BIT(i) & pin_mask))
continue;
port = get_port_from_pin(i);
is_dig_port = port && dev_priv->hotplug.irq_port[port];
if (is_dig_port) {
bool long_hpd = long_mask & BIT(i);
DRM_DEBUG_DRIVER("digital hpd port %c - %s\n", port_name(port),
long_hpd ? "long" : "short");
/*
* For long HPD pulses we want to have the digital queue happen,
* but we still want HPD storm detection to function.
*/
queue_dig = true;
if (long_hpd) {
dev_priv->hotplug.long_port_mask |= (1 << port);
} else {
/* for short HPD just trigger the digital queue */
dev_priv->hotplug.short_port_mask |= (1 << port);
continue;
}
}
if (dev_priv->hotplug.stats[i].state == HPD_DISABLED) {
/*
* On GMCH platforms the interrupt mask bits only
* prevent irq generation, not the setting of the
* hotplug bits itself. So only WARN about unexpected
* interrupts on saner platforms.
*/
WARN_ONCE(INTEL_INFO(dev)->gen >= 5 && !IS_VALLEYVIEW(dev),
"Received HPD interrupt on pin %d although disabled\n", i);
continue;
}
if (dev_priv->hotplug.stats[i].state != HPD_ENABLED)
continue;
if (!is_dig_port) {
dev_priv->hotplug.event_bits |= BIT(i);
queue_hp = true;
}
if (intel_hpd_irq_storm_detect(dev_priv, i)) {
dev_priv->hotplug.event_bits &= ~BIT(i);
storm_detected = true;
}
}
if (storm_detected)
dev_priv->display.hpd_irq_setup(dev);
spin_unlock(&dev_priv->irq_lock);
/*
* Our hotplug handler can grab modeset locks (by calling down into the
* fb helpers). Hence it must not be run on our own dev-priv->wq work
* queue for otherwise the flush_work in the pageflip code will
* deadlock.
*/
if (queue_dig)
queue_work(dev_priv->hotplug.dp_wq, &dev_priv->hotplug.dig_port_work);
if (queue_hp)
schedule_work(&dev_priv->hotplug.hotplug_work);
}
static void gmbus_irq_handler(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@ -4367,46 +4048,6 @@ static void i965_irq_uninstall(struct drm_device * dev)
I915_WRITE(IIR, I915_READ(IIR));
}
static void intel_hpd_irq_storm_reenable_work(struct work_struct *work)
{
struct drm_i915_private *dev_priv =
container_of(work, typeof(*dev_priv),
hotplug.reenable_work.work);
struct drm_device *dev = dev_priv->dev;
struct drm_mode_config *mode_config = &dev->mode_config;
int i;
intel_runtime_pm_get(dev_priv);
spin_lock_irq(&dev_priv->irq_lock);
for_each_hpd_pin(i) {
struct drm_connector *connector;
if (dev_priv->hotplug.stats[i].state != HPD_DISABLED)
continue;
dev_priv->hotplug.stats[i].state = HPD_ENABLED;
list_for_each_entry(connector, &mode_config->connector_list, head) {
struct intel_connector *intel_connector = to_intel_connector(connector);
if (intel_connector->encoder->hpd_pin == i) {
if (connector->polled != intel_connector->polled)
DRM_DEBUG_DRIVER("Reenabling HPD on connector %s\n",
connector->name);
connector->polled = intel_connector->polled;
if (!connector->polled)
connector->polled = DRM_CONNECTOR_POLL_HPD;
}
}
}
if (dev_priv->display.hpd_irq_setup)
dev_priv->display.hpd_irq_setup(dev);
spin_unlock_irq(&dev_priv->irq_lock);
intel_runtime_pm_put(dev_priv);
}
/**
* intel_irq_init - initializes irq support
* @dev_priv: i915 device instance
@ -4418,8 +4059,8 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
{
struct drm_device *dev = dev_priv->dev;
INIT_WORK(&dev_priv->hotplug.hotplug_work, i915_hotplug_work_func);
INIT_WORK(&dev_priv->hotplug.dig_port_work, i915_digport_work_func);
intel_hpd_init_work(dev_priv);
INIT_WORK(&dev_priv->rps.work, gen6_pm_rps_work);
INIT_WORK(&dev_priv->l3_parity.error_work, ivybridge_parity_work);
@ -4432,8 +4073,6 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
INIT_DELAYED_WORK(&dev_priv->gpu_error.hangcheck_work,
i915_hangcheck_elapsed);
INIT_DELAYED_WORK(&dev_priv->hotplug.reenable_work,
intel_hpd_irq_storm_reenable_work);
pm_qos_add_request(&dev_priv->pm_qos, PM_QOS_CPU_DMA_LATENCY, PM_QOS_DEFAULT_VALUE);
@ -4518,46 +4157,6 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
}
}
/**
* intel_hpd_init - initializes and enables hpd support
* @dev_priv: i915 device instance
*
* This function enables the hotplug support. It requires that interrupts have
* already been enabled with intel_irq_init_hw(). From this point on hotplug and
* poll request can run concurrently to other code, so locking rules must be
* obeyed.
*
* This is a separate step from interrupt enabling to simplify the locking rules
* in the driver load and resume code.
*/
void intel_hpd_init(struct drm_i915_private *dev_priv)
{
struct drm_device *dev = dev_priv->dev;
struct drm_mode_config *mode_config = &dev->mode_config;
struct drm_connector *connector;
int i;
for_each_hpd_pin(i) {
dev_priv->hotplug.stats[i].count = 0;
dev_priv->hotplug.stats[i].state = HPD_ENABLED;
}
list_for_each_entry(connector, &mode_config->connector_list, head) {
struct intel_connector *intel_connector = to_intel_connector(connector);
connector->polled = intel_connector->polled;
if (connector->encoder && !connector->polled && I915_HAS_HOTPLUG(dev) && intel_connector->encoder->hpd_pin > HPD_NONE)
connector->polled = DRM_CONNECTOR_POLL_HPD;
if (intel_connector->mst_port)
connector->polled = DRM_CONNECTOR_POLL_HPD;
}
/* Interrupt setup is already guaranteed to be single-threaded, this is
* just to make the assert_spin_locked checks happy. */
spin_lock_irq(&dev_priv->irq_lock);
if (dev_priv->display.hpd_irq_setup)
dev_priv->display.hpd_irq_setup(dev);
spin_unlock_irq(&dev_priv->irq_lock);
}
/**
* intel_irq_install - enables the hardware interrupt
* @dev_priv: i915 device instance

452
drivers/gpu/drm/i915/intel_hotplug.c Normal file
View File

@ -0,0 +1,452 @@
/*
* Copyright © 2015 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <linux/kernel.h>
#include <drm/drmP.h>
#include <drm/i915_drm.h>
#include "i915_drv.h"
#include "intel_drv.h"
enum port intel_hpd_pin_to_port(enum hpd_pin pin)
{
switch (pin) {
case HPD_PORT_B:
return PORT_B;
case HPD_PORT_C:
return PORT_C;
case HPD_PORT_D:
return PORT_D;
default:
return PORT_A; /* no hpd */
}
}
#define HPD_STORM_DETECT_PERIOD 1000
#define HPD_STORM_THRESHOLD 5
#define HPD_STORM_REENABLE_DELAY (2 * 60 * 1000)
/**
* intel_hpd_irq_storm_detect - gather stats and detect HPD irq storm on a pin
* @dev_priv: private driver data pointer
* @pin: the pin to gather stats on
*
* Gather stats about HPD irqs from the specified @pin, and detect irq
* storms. Only the pin specific stats and state are changed, the caller is
* responsible for further action.
*
* @HPD_STORM_THRESHOLD irqs are allowed within @HPD_STORM_DETECT_PERIOD ms,
* otherwise it's considered an irq storm, and the irq state is set to
* @HPD_MARK_DISABLED.
*
* Return true if an irq storm was detected on @pin.
*/
static bool intel_hpd_irq_storm_detect(struct drm_i915_private *dev_priv,
enum hpd_pin pin)
{
unsigned long start = dev_priv->hotplug.stats[pin].last_jiffies;
unsigned long end = start + msecs_to_jiffies(HPD_STORM_DETECT_PERIOD);
bool storm = false;
if (!time_in_range(jiffies, start, end)) {
dev_priv->hotplug.stats[pin].last_jiffies = jiffies;
dev_priv->hotplug.stats[pin].count = 0;
DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: 0\n", pin);
} else if (dev_priv->hotplug.stats[pin].count > HPD_STORM_THRESHOLD) {
dev_priv->hotplug.stats[pin].state = HPD_MARK_DISABLED;
DRM_DEBUG_KMS("HPD interrupt storm detected on PIN %d\n", pin);
storm = true;
} else {
dev_priv->hotplug.stats[pin].count++;
DRM_DEBUG_KMS("Received HPD interrupt on PIN %d - cnt: %d\n", pin,
dev_priv->hotplug.stats[pin].count);
}
return storm;
}
static void intel_hpd_irq_storm_disable(struct drm_i915_private *dev_priv)
{
struct drm_device *dev = dev_priv->dev;
struct drm_mode_config *mode_config = &dev->mode_config;
struct intel_connector *intel_connector;
struct intel_encoder *intel_encoder;
struct drm_connector *connector;
enum hpd_pin pin;
bool hpd_disabled = false;
assert_spin_locked(&dev_priv->irq_lock);
list_for_each_entry(connector, &mode_config->connector_list, head) {
if (connector->polled != DRM_CONNECTOR_POLL_HPD)
continue;
intel_connector = to_intel_connector(connector);
intel_encoder = intel_connector->encoder;
if (!intel_encoder)
continue;
pin = intel_encoder->hpd_pin;
if (pin == HPD_NONE ||
dev_priv->hotplug.stats[pin].state != HPD_MARK_DISABLED)
continue;
DRM_INFO("HPD interrupt storm detected on connector %s: "
"switching from hotplug detection to polling\n",
connector->name);
dev_priv->hotplug.stats[pin].state = HPD_DISABLED;
connector->polled = DRM_CONNECTOR_POLL_CONNECT
| DRM_CONNECTOR_POLL_DISCONNECT;
hpd_disabled = true;
}
/* Enable polling and queue hotplug re-enabling. */
if (hpd_disabled) {
drm_kms_helper_poll_enable(dev);
mod_delayed_work(system_wq, &dev_priv->hotplug.reenable_work,
msecs_to_jiffies(HPD_STORM_REENABLE_DELAY));
}
}
static void intel_hpd_irq_storm_reenable_work(struct work_struct *work)
{
struct drm_i915_private *dev_priv =
container_of(work, typeof(*dev_priv),
hotplug.reenable_work.work);
struct drm_device *dev = dev_priv->dev;
struct drm_mode_config *mode_config = &dev->mode_config;
int i;
intel_runtime_pm_get(dev_priv);
spin_lock_irq(&dev_priv->irq_lock);
for_each_hpd_pin(i) {
struct drm_connector *connector;
if (dev_priv->hotplug.stats[i].state != HPD_DISABLED)
continue;
dev_priv->hotplug.stats[i].state = HPD_ENABLED;
list_for_each_entry(connector, &mode_config->connector_list, head) {
struct intel_connector *intel_connector = to_intel_connector(connector);
if (intel_connector->encoder->hpd_pin == i) {
if (connector->polled != intel_connector->polled)
DRM_DEBUG_DRIVER("Reenabling HPD on connector %s\n",
connector->name);
connector->polled = intel_connector->polled;
if (!connector->polled)
connector->polled = DRM_CONNECTOR_POLL_HPD;
}
}
}
if (dev_priv->display.hpd_irq_setup)
dev_priv->display.hpd_irq_setup(dev);
spin_unlock_irq(&dev_priv->irq_lock);
intel_runtime_pm_put(dev_priv);
}
static bool intel_hpd_irq_event(struct drm_device *dev,
struct drm_connector *connector)
{
enum drm_connector_status old_status;
WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
old_status = connector->status;
connector->status = connector->funcs->detect(connector, false);
if (old_status == connector->status)
return false;
DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
connector->base.id,
connector->name,
drm_get_connector_status_name(old_status),
drm_get_connector_status_name(connector->status));
return true;
}
static void i915_digport_work_func(struct work_struct *work)
{
struct drm_i915_private *dev_priv =
container_of(work, struct drm_i915_private, hotplug.dig_port_work);
u32 long_port_mask, short_port_mask;
struct intel_digital_port *intel_dig_port;
int i;
u32 old_bits = 0;
spin_lock_irq(&dev_priv->irq_lock);
long_port_mask = dev_priv->hotplug.long_port_mask;
dev_priv->hotplug.long_port_mask = 0;
short_port_mask = dev_priv->hotplug.short_port_mask;
dev_priv->hotplug.short_port_mask = 0;
spin_unlock_irq(&dev_priv->irq_lock);
for (i = 0; i < I915_MAX_PORTS; i++) {
bool valid = false;
bool long_hpd = false;
intel_dig_port = dev_priv->hotplug.irq_port[i];
if (!intel_dig_port || !intel_dig_port->hpd_pulse)
continue;
if (long_port_mask & (1 << i)) {
valid = true;
long_hpd = true;
} else if (short_port_mask & (1 << i))
valid = true;
if (valid) {
enum irqreturn ret;
ret = intel_dig_port->hpd_pulse(intel_dig_port, long_hpd);
if (ret == IRQ_NONE) {
/* fall back to old school hpd */
old_bits |= (1 << intel_dig_port->base.hpd_pin);
}
}
}
if (old_bits) {
spin_lock_irq(&dev_priv->irq_lock);
dev_priv->hotplug.event_bits |= old_bits;
spin_unlock_irq(&dev_priv->irq_lock);
schedule_work(&dev_priv->hotplug.hotplug_work);
}
}
/*
* Handle hotplug events outside the interrupt handler proper.
*/
static void i915_hotplug_work_func(struct work_struct *work)
{
struct drm_i915_private *dev_priv =
container_of(work, struct drm_i915_private, hotplug.hotplug_work);
struct drm_device *dev = dev_priv->dev;
struct drm_mode_config *mode_config = &dev->mode_config;
struct intel_connector *intel_connector;
struct intel_encoder *intel_encoder;
struct drm_connector *connector;
bool changed = false;
u32 hpd_event_bits;
mutex_lock(&mode_config->mutex);
DRM_DEBUG_KMS("running encoder hotplug functions\n");
spin_lock_irq(&dev_priv->irq_lock);
hpd_event_bits = dev_priv->hotplug.event_bits;
dev_priv->hotplug.event_bits = 0;
/* Disable hotplug on connectors that hit an irq storm. */
intel_hpd_irq_storm_disable(dev_priv);
spin_unlock_irq(&dev_priv->irq_lock);
list_for_each_entry(connector, &mode_config->connector_list, head) {
intel_connector = to_intel_connector(connector);
if (!intel_connector->encoder)
continue;
intel_encoder = intel_connector->encoder;
if (hpd_event_bits & (1 << intel_encoder->hpd_pin)) {
DRM_DEBUG_KMS("Connector %s (pin %i) received hotplug event.\n",
connector->name, intel_encoder->hpd_pin);
if (intel_encoder->hot_plug)
intel_encoder->hot_plug(intel_encoder);
if (intel_hpd_irq_event(dev, connector))
changed = true;
}
}
mutex_unlock(&mode_config->mutex);
if (changed)
drm_kms_helper_hotplug_event(dev);
}
/**
* intel_hpd_irq_handler - main hotplug irq handler
* @dev: drm device
* @pin_mask: a mask of hpd pins that have triggered the irq
* @long_mask: a mask of hpd pins that may be long hpd pulses
*
* This is the main hotplug irq handler for all platforms. The platform specific
* irq handlers call the platform specific hotplug irq handlers, which read and
* decode the appropriate registers into bitmasks about hpd pins that have
* triggered (@pin_mask), and which of those pins may be long pulses
* (@long_mask). The @long_mask is ignored if the port corresponding to the pin
* is not a digital port.
*
* Here, we do hotplug irq storm detection and mitigation, and pass further
* processing to appropriate bottom halves.
*/
void intel_hpd_irq_handler(struct drm_device *dev,
u32 pin_mask, u32 long_mask)
{
struct drm_i915_private *dev_priv = dev->dev_private;
int i;
enum port port;
bool storm_detected = false;
bool queue_dig = false, queue_hp = false;
bool is_dig_port;
if (!pin_mask)
return;
spin_lock(&dev_priv->irq_lock);
for_each_hpd_pin(i) {
if (!(BIT(i) & pin_mask))
continue;
port = intel_hpd_pin_to_port(i);
is_dig_port = port && dev_priv->hotplug.irq_port[port];
if (is_dig_port) {
bool long_hpd = long_mask & BIT(i);
DRM_DEBUG_DRIVER("digital hpd port %c - %s\n", port_name(port),
long_hpd ? "long" : "short");
/*
* For long HPD pulses we want to have the digital queue happen,
* but we still want HPD storm detection to function.
*/
queue_dig = true;
if (long_hpd) {
dev_priv->hotplug.long_port_mask |= (1 << port);
} else {
/* for short HPD just trigger the digital queue */
dev_priv->hotplug.short_port_mask |= (1 << port);
continue;
}
}
if (dev_priv->hotplug.stats[i].state == HPD_DISABLED) {
/*
* On GMCH platforms the interrupt mask bits only
* prevent irq generation, not the setting of the
* hotplug bits itself. So only WARN about unexpected
* interrupts on saner platforms.
*/
WARN_ONCE(INTEL_INFO(dev)->gen >= 5 && !IS_VALLEYVIEW(dev),
"Received HPD interrupt on pin %d although disabled\n", i);
continue;
}
if (dev_priv->hotplug.stats[i].state != HPD_ENABLED)
continue;
if (!is_dig_port) {
dev_priv->hotplug.event_bits |= BIT(i);
queue_hp = true;
}
if (intel_hpd_irq_storm_detect(dev_priv, i)) {
dev_priv->hotplug.event_bits &= ~BIT(i);
storm_detected = true;
}
}
if (storm_detected)
dev_priv->display.hpd_irq_setup(dev);
spin_unlock(&dev_priv->irq_lock);
/*
* Our hotplug handler can grab modeset locks (by calling down into the
* fb helpers). Hence it must not be run on our own dev-priv->wq work
* queue for otherwise the flush_work in the pageflip code will
* deadlock.
*/
if (queue_dig)
queue_work(dev_priv->hotplug.dp_wq, &dev_priv->hotplug.dig_port_work);
if (queue_hp)
schedule_work(&dev_priv->hotplug.hotplug_work);
}
/**
* intel_hpd_init - initializes and enables hpd support
* @dev_priv: i915 device instance
*
* This function enables the hotplug support. It requires that interrupts have
* already been enabled with intel_irq_init_hw(). From this point on hotplug and
* poll request can run concurrently to other code, so locking rules must be
* obeyed.
*
* This is a separate step from interrupt enabling to simplify the locking rules
* in the driver load and resume code.
*/
void intel_hpd_init(struct drm_i915_private *dev_priv)
{
struct drm_device *dev = dev_priv->dev;
struct drm_mode_config *mode_config = &dev->mode_config;
struct drm_connector *connector;
int i;
for_each_hpd_pin(i) {
dev_priv->hotplug.stats[i].count = 0;
dev_priv->hotplug.stats[i].state = HPD_ENABLED;
}
list_for_each_entry(connector, &mode_config->connector_list, head) {
struct intel_connector *intel_connector = to_intel_connector(connector);
connector->polled = intel_connector->polled;
if (connector->encoder && !connector->polled && I915_HAS_HOTPLUG(dev) && intel_connector->encoder->hpd_pin > HPD_NONE)
connector->polled = DRM_CONNECTOR_POLL_HPD;
if (intel_connector->mst_port)
connector->polled = DRM_CONNECTOR_POLL_HPD;
}
/*
* Interrupt setup is already guaranteed to be single-threaded, this is
* just to make the assert_spin_locked checks happy.
*/
spin_lock_irq(&dev_priv->irq_lock);
if (dev_priv->display.hpd_irq_setup)
dev_priv->display.hpd_irq_setup(dev);
spin_unlock_irq(&dev_priv->irq_lock);
}
void intel_hpd_init_work(struct drm_i915_private *dev_priv)
{
INIT_WORK(&dev_priv->hotplug.hotplug_work, i915_hotplug_work_func);
INIT_WORK(&dev_priv->hotplug.dig_port_work, i915_digport_work_func);
INIT_DELAYED_WORK(&dev_priv->hotplug.reenable_work,
intel_hpd_irq_storm_reenable_work);
}
void intel_hpd_cancel_work(struct drm_i915_private *dev_priv)
{
spin_lock_irq(&dev_priv->irq_lock);
dev_priv->hotplug.long_port_mask = 0;
dev_priv->hotplug.short_port_mask = 0;
dev_priv->hotplug.event_bits = 0;
spin_unlock_irq(&dev_priv->irq_lock);
cancel_work_sync(&dev_priv->hotplug.dig_port_work);
cancel_work_sync(&dev_priv->hotplug.hotplug_work);
cancel_delayed_work_sync(&dev_priv->hotplug.reenable_work);
}