Add power management to the driver, using runtime pm. The power off
sequence depends on firmware commands which are not implemented in this
patch.
Signed-off-by: Sarah Walker <sarah.walker@xxxxxxxxxx>
---
drivers/gpu/drm/imagination/Makefile | 1 +
drivers/gpu/drm/imagination/pvr_device.c | 20 +-
drivers/gpu/drm/imagination/pvr_device.h | 17 ++
drivers/gpu/drm/imagination/pvr_drv.c | 35 +++-
drivers/gpu/drm/imagination/pvr_power.c | 239 +++++++++++++++++++++++
drivers/gpu/drm/imagination/pvr_power.h | 41 ++++
6 files changed, 351 insertions(+), 2 deletions(-)
create mode 100644 drivers/gpu/drm/imagination/pvr_power.c
create mode 100644 drivers/gpu/drm/imagination/pvr_power.h
diff --git a/drivers/gpu/drm/imagination/Makefile b/drivers/gpu/drm/imagination/Makefile
index 93d89909a8d7..00036b075505 100644
--- a/drivers/gpu/drm/imagination/Makefile
+++ b/drivers/gpu/drm/imagination/Makefile
@@ -8,6 +8,7 @@ powervr-y := \
pvr_device_info.o \
pvr_drv.o \
pvr_gem.o \
+ pvr_power.o \
pvr_vm.o
obj-$(CONFIG_DRM_POWERVR) += powervr.o
diff --git a/drivers/gpu/drm/imagination/pvr_device.c b/drivers/gpu/drm/imagination/pvr_device.c
index 6f7ef3767e56..8428e1270a22 100644
--- a/drivers/gpu/drm/imagination/pvr_device.c
+++ b/drivers/gpu/drm/imagination/pvr_device.c
@@ -5,6 +5,7 @@
#include "pvr_device_info.h"
#include "pvr_fw.h"
+#include "pvr_power.h"
#include "pvr_rogue_cr_defs.h"
#include "pvr_vm.h"
@@ -492,6 +493,8 @@ pvr_device_gpu_fini(struct pvr_device *pvr_dev)
int
pvr_device_init(struct pvr_device *pvr_dev)
{
+ struct drm_device *drm_dev = from_pvr_device(pvr_dev);
+ struct device *dev = drm_dev->dev;
int err;
/* Enable and initialize clocks required for the device to operate. */
@@ -503,21 +506,31 @@ pvr_device_init(struct pvr_device *pvr_dev)
if (err)
goto err_device_clk_fini;
+ /* Explicitly power the GPU so we can access control registers before the FW is booted. */
+ err = pm_runtime_resume_and_get(dev);
+ if (err)
+ goto err_device_clk_fini;
+
/* Map the control registers into memory. */
err = pvr_device_reg_init(pvr_dev);
if (err)
- goto err_device_clk_fini;
+ goto err_pm_runtime_put;
/* Perform GPU-specific initialization steps. */
err = pvr_device_gpu_init(pvr_dev);
if (err)
goto err_device_reg_fini;
+ pm_runtime_put_autosuspend(dev);
+
return 0;
err_device_reg_fini:
pvr_device_reg_fini(pvr_dev);
+err_pm_runtime_put:
+ pm_runtime_put_sync_suspend(dev);
+
err_device_clk_fini:
pvr_device_clk_fini(pvr_dev);
@@ -532,12 +545,17 @@ pvr_device_init(struct pvr_device *pvr_dev)
void
pvr_device_fini(struct pvr_device *pvr_dev)
{
+ struct drm_device *drm_dev = from_pvr_device(pvr_dev);
+ struct device *dev = drm_dev->dev;
+
/*
* Deinitialization stages are performed in reverse order compared to
* the initialization stages in pvr_device_init().
*/
+ pm_runtime_get_sync(dev);
pvr_device_gpu_fini(pvr_dev);
pvr_device_reg_fini(pvr_dev);
+ pm_runtime_put_sync_suspend(dev);
pvr_device_clk_fini(pvr_dev);
}
diff --git a/drivers/gpu/drm/imagination/pvr_device.h b/drivers/gpu/drm/imagination/pvr_device.h
index ce10bca36eb1..e5c5e47bf573 100644
--- a/drivers/gpu/drm/imagination/pvr_device.h
+++ b/drivers/gpu/drm/imagination/pvr_device.h
@@ -118,6 +118,9 @@ struct pvr_device {
/** @regulator: Power regulator. */
struct regulator *regulator;
+ /** @irq_wq: Workqueue for actions triggered off the IRQ handler. */
+ struct workqueue_struct *irq_wq;
+
/**
* @kernel_vm_ctx: Virtual memory context used for kernel mappings.
*
@@ -130,6 +133,20 @@ struct pvr_device {
/** @fw_dev: Firmware related data. */
struct pvr_fw_device fw_dev;
+
+ struct {
+ /** @work: Work item for watchdog callback. */
+ struct delayed_work work;
+
+ /** @old_kccb_cmds_executed: KCCB command execution count at last watchdog poll. */
+ u32 old_kccb_cmds_executed;
+
+ /** @kccb_stall_count: Number of watchdog polls KCCB has been stalled for. */
+ u32 kccb_stall_count;
+ } watchdog;
+
+ /** @lost: %true if the device has been lost. */
+ bool lost;
};
/**
diff --git a/drivers/gpu/drm/imagination/pvr_drv.c b/drivers/gpu/drm/imagination/pvr_drv.c
index 547b4fbe355c..9d26cfcc7a16 100644
--- a/drivers/gpu/drm/imagination/pvr_drv.c
+++ b/drivers/gpu/drm/imagination/pvr_drv.c
@@ -4,6 +4,7 @@
#include "pvr_device.h"
#include "pvr_drv.h"
#include "pvr_gem.h"
+#include "pvr_power.h"
#include "pvr_rogue_defs.h"
#include "pvr_rogue_fwif_client.h"
#include "pvr_rogue_fwif_shared.h"
@@ -73,6 +74,9 @@ pvr_ioctl_create_bo(struct drm_device *drm_dev, void *raw_args,
int err;
+ if (pvr_dev->lost)
+ return -EIO;
+
/* All padding fields must be zeroed. */
if (args->_padding_c != 0)
return -EINVAL;
@@ -159,11 +163,15 @@ pvr_ioctl_get_bo_mmap_offset(__always_unused struct drm_device *drm_dev,
void *raw_args, struct drm_file *file)
{
struct drm_pvr_ioctl_get_bo_mmap_offset_args *args = raw_args;
+ struct pvr_device *pvr_dev = to_pvr_device(drm_dev);
struct pvr_file *pvr_file = to_pvr_file(file);
struct pvr_gem_object *pvr_obj;
struct drm_gem_object *gem_obj;
int ret;
+ if (pvr_dev->lost)
+ return -EIO;
+
/* All padding fields must be zeroed. */
if (args->_padding_4 != 0)
return -EINVAL;
@@ -647,6 +655,9 @@ pvr_ioctl_dev_query(struct drm_device *drm_dev, void *raw_args,
struct pvr_device *pvr_dev = to_pvr_device(drm_dev);
struct drm_pvr_ioctl_dev_query_args *args = raw_args;
+ if (pvr_dev->lost)
+ return -EIO;
+
switch ((enum drm_pvr_dev_query)args->type) {
case DRM_PVR_DEV_QUERY_GPU_INFO_GET:
return pvr_dev_query_gpu_info_get(pvr_dev, args);
@@ -813,10 +824,14 @@ pvr_ioctl_create_vm_context(struct drm_device *drm_dev, void *raw_args,
struct drm_file *file)
{
struct drm_pvr_ioctl_create_vm_context_args *args = raw_args;
+ struct pvr_device *pvr_dev = to_pvr_device(drm_dev);
struct pvr_file *pvr_file = to_pvr_file(file);
struct pvr_vm_context *vm_ctx;
int err;
+ if (pvr_dev->lost)
+ return -EIO;
+
if (args->_padding_4)
return -EINVAL;
@@ -911,6 +926,9 @@ pvr_ioctl_vm_map(struct drm_device *drm_dev, void *raw_args,
u64 offset_plus_size;
int err;
+ if (pvr_dev->lost)
+ return -EIO;
+
/* Initial validation of args. */
if (args->_padding_14)
return -EINVAL;
@@ -1285,9 +1303,15 @@ pvr_probe(struct platform_device *plat_dev)
platform_set_drvdata(plat_dev, drm_dev);
+ devm_pm_runtime_enable(&plat_dev->dev);
+
+ pm_runtime_set_autosuspend_delay(&plat_dev->dev, 50);
+ pm_runtime_use_autosuspend(&plat_dev->dev);
+ pvr_power_init(pvr_dev);
+
err = pvr_device_init(pvr_dev);
if (err)
- goto err_out;
+ goto err_power_fini;
err = drm_dev_register(drm_dev, 0);
if (err)
@@ -1298,6 +1322,9 @@ pvr_probe(struct platform_device *plat_dev)
err_device_fini:
pvr_device_fini(pvr_dev);
+err_power_fini:
+ pvr_power_fini(pvr_dev);
+
err_out:
return err;
}
@@ -1310,6 +1337,7 @@ pvr_remove(struct platform_device *plat_dev)
drm_dev_unregister(drm_dev);
pvr_device_fini(pvr_dev);
+ pvr_power_fini(pvr_dev);
return 0;
}
@@ -1321,11 +1349,16 @@ static const struct of_device_id dt_match[] = {
};
MODULE_DEVICE_TABLE(of, dt_match);
+static const struct dev_pm_ops pvr_pm_ops = {
+ SET_RUNTIME_PM_OPS(pvr_power_device_suspend, pvr_power_device_resume, pvr_power_device_idle)
+};
+
static struct platform_driver pvr_driver = {
.probe = pvr_probe,
.remove = pvr_remove,
.driver = {
.name = PVR_DRIVER_NAME,
+ .pm = &pvr_pm_ops,
.of_match_table = dt_match,
},
};
diff --git a/drivers/gpu/drm/imagination/pvr_power.c b/drivers/gpu/drm/imagination/pvr_power.c
new file mode 100644
index 000000000000..fa1a84934127
--- /dev/null
+++ b/drivers/gpu/drm/imagination/pvr_power.c
@@ -0,0 +1,239 @@
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+/* Copyright (c) 2022 Imagination Technologies Ltd. */
+
+#include "pvr_device.h"
+#include "pvr_fw.h"
+#include "pvr_power.h"
+#include "pvr_rogue_fwif.h"
+
+#include <drm/drm_managed.h>
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
+#include <linux/timer.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+
+#define POWER_SYNC_TIMEOUT_US (1000000) /* 1s */
+
+#define WATCHDOG_TIME_MS (500)
+
+static void
+pvr_device_lost(struct pvr_device *pvr_dev)
+{
+ if (!pvr_dev->lost)
+ pvr_dev->lost = true;
+}
+
+static int
+pvr_power_send_command(struct pvr_device *pvr_dev, struct rogue_fwif_kccb_cmd *pow_cmd)
+{
+ /* TODO: implement */
+ return -ENODEV;
+}
+
+int
+pvr_power_request_idle(struct pvr_device *pvr_dev)
+{
+ struct rogue_fwif_kccb_cmd pow_cmd;
+
+ /* Send FORCED_IDLE request to FW. */
+ pow_cmd.cmd_type = ROGUE_FWIF_KCCB_CMD_POW;
+ pow_cmd.cmd_data.pow_data.pow_type = ROGUE_FWIF_POW_FORCED_IDLE_REQ;
+ pow_cmd.cmd_data.pow_data.power_req_data.pow_request_type = ROGUE_FWIF_POWER_FORCE_IDLE;
+
+ return pvr_power_send_command(pvr_dev, &pow_cmd);
+}
+
+int
+pvr_power_request_pwr_off(struct pvr_device *pvr_dev)
+{
+ struct rogue_fwif_kccb_cmd pow_cmd;
+
+ /* Send POW_OFF request to firmware. */
+ pow_cmd.cmd_type = ROGUE_FWIF_KCCB_CMD_POW;
+ pow_cmd.cmd_data.pow_data.pow_type = ROGUE_FWIF_POW_OFF_REQ;
+ pow_cmd.cmd_data.pow_data.power_req_data.forced = true;
+
+ return pvr_power_send_command(pvr_dev, &pow_cmd);
+}
+
+static int
+pvr_power_fw_disable(struct pvr_device *pvr_dev)
+{
+ int err;
+
+ cancel_delayed_work_sync(&pvr_dev->watchdog.work);
+
+ err = pvr_power_request_idle(pvr_dev);
+ if (err)
+ return err;
+
+ err = pvr_power_request_pwr_off(pvr_dev);
+ if (err)
+ return err;
+
+ /* TODO: stop firmware */
+ return -ENODEV;
+}
+
+static int
+pvr_power_fw_enable(struct pvr_device *pvr_dev)
+{
+ int err;
+
+ /* TODO: start firmware */
+ err = -ENODEV;
+ if (err)
+ return err;
+
+ queue_delayed_work(pvr_dev->irq_wq, &pvr_dev->watchdog.work,
+ msecs_to_jiffies(WATCHDOG_TIME_MS));
+
+ return 0;
+}
+
+bool
+pvr_power_is_idle(struct pvr_device *pvr_dev)
+{
+ /* TODO: implement */
+ return true;
+}
+
+static bool
+pvr_watchdog_kccb_stalled(struct pvr_device *pvr_dev)
+{
+ /* TODO: implement */
+ return false;
+}
+
+static void
+pvr_watchdog_worker(struct work_struct *work)
+{
+ struct pvr_device *pvr_dev = container_of(work, struct pvr_device,
+ watchdog.work.work);
+ bool stalled;
+
+ if (pvr_dev->lost)
+ return;
+
+ if (pm_runtime_get_if_in_use(from_pvr_device(pvr_dev)->dev) <= 0)
+ return;
+
+ stalled = pvr_watchdog_kccb_stalled(pvr_dev);
+
+ if (stalled) {
+ drm_err(from_pvr_device(pvr_dev), "GPU device lost");
+ pvr_device_lost(pvr_dev);
+ }
+
+ if (!pvr_dev->lost) {
+ queue_delayed_work(pvr_dev->irq_wq, &pvr_dev->watchdog.work,
+ msecs_to_jiffies(WATCHDOG_TIME_MS));
+ }
+
+ pm_runtime_put(from_pvr_device(pvr_dev)->dev);
+}
+
+/**
+ * pvr_power_init() - Initialise power management for device
+ * @pvr_dev: Target PowerVR device.
+ *
+ * Returns:
+ * * 0 on success, or
+ * * -%ENOMEM on out of memory.
+ */
+int
+pvr_power_init(struct pvr_device *pvr_dev)
+{
+ INIT_DELAYED_WORK(&pvr_dev->watchdog.work, pvr_watchdog_worker);
+
+ return 0;
+}
+
+int
+pvr_power_device_suspend(struct device *dev)
+{
+ struct platform_device *plat_dev = to_platform_device(dev);
+ struct drm_device *drm_dev = platform_get_drvdata(plat_dev);
+ struct pvr_device *pvr_dev = to_pvr_device(drm_dev);
+
+ clk_disable(pvr_dev->mem_clk);
+ clk_disable(pvr_dev->sys_clk);
+ clk_disable(pvr_dev->core_clk);
+
+ if (pvr_dev->regulator)
+ regulator_disable(pvr_dev->regulator);
+
+ return 0;
+}
+
+int
+pvr_power_device_resume(struct device *dev)
+{
+ struct platform_device *plat_dev = to_platform_device(dev);
+ struct drm_device *drm_dev = platform_get_drvdata(plat_dev);
+ struct pvr_device *pvr_dev = to_pvr_device(drm_dev);
+ int err;
+
+ if (pvr_dev->regulator) {
+ err = regulator_enable(pvr_dev->regulator);
+ if (err)
+ return err;
+ }
+
+ clk_enable(pvr_dev->core_clk);
+ clk_enable(pvr_dev->sys_clk);
+ clk_enable(pvr_dev->mem_clk);
+
+ return 0;
+}
+
+int
+pvr_power_device_idle(struct device *dev)
+{
+ struct platform_device *plat_dev = to_platform_device(dev);
+ struct drm_device *drm_dev = platform_get_drvdata(plat_dev);
+ struct pvr_device *pvr_dev = to_pvr_device(drm_dev);
+
+ return pvr_power_is_idle(pvr_dev) ? 0 : -EBUSY;
+}
+
+int
+pvr_power_reset(struct pvr_device *pvr_dev)
+{
+ int err;
+
+ /*
+ * Take a power reference during the reset. This should prevent any interference with the
+ * power state during reset.
+ */
+ err = pvr_power_get(pvr_dev);
+ if (err)
+ goto err_out;
+
+ err = pvr_power_fw_disable(pvr_dev);
+ if (err)
+ goto err_power_put;
+
+ err = pvr_power_fw_enable(pvr_dev);
+
+err_power_put:
+ pvr_power_put(pvr_dev);
+
+err_out:
+ return err;
+}
+
+/**
+ * pvr_power_fini() - Shutdown power management for device
+ * @pvr_dev: Target PowerVR device.
+ */
+void
+pvr_power_fini(struct pvr_device *pvr_dev)
+{
+ cancel_delayed_work_sync(&pvr_dev->watchdog.work);
+}
diff --git a/drivers/gpu/drm/imagination/pvr_power.h b/drivers/gpu/drm/imagination/pvr_power.h
new file mode 100644
index 000000000000..557457e7bdcd
--- /dev/null
+++ b/drivers/gpu/drm/imagination/pvr_power.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0 OR MIT */
+/* Copyright (c) 2022 Imagination Technologies Ltd. */
+
+#ifndef PVR_POWER_H
+#define PVR_POWER_H
+
+#include "pvr_device.h"
+
+#include <linux/mutex.h>
+#include <linux/pm_runtime.h>
+
+int pvr_power_init(struct pvr_device *pvr_dev);
+void pvr_power_fini(struct pvr_device *pvr_dev);
+bool pvr_power_is_idle(struct pvr_device *pvr_dev);
+
+int pvr_power_request_idle(struct pvr_device *pvr_dev);
+int pvr_power_request_pwr_off(struct pvr_device *pvr_dev);
+
+int pvr_power_device_suspend(struct device *dev);
+int pvr_power_device_resume(struct device *dev);
+int pvr_power_device_idle(struct device *dev);
+
+int pvr_power_reset(struct pvr_device *pvr_dev);
+
+static __always_inline int
+pvr_power_get(struct pvr_device *pvr_dev)
+{
+ struct drm_device *drm_dev = from_pvr_device(pvr_dev);
+
+ return pm_runtime_resume_and_get(drm_dev->dev);
+}
+
+static __always_inline int
+pvr_power_put(struct pvr_device *pvr_dev)
+{
+ struct drm_device *drm_dev = from_pvr_device(pvr_dev);
+
+ return pm_runtime_put(drm_dev->dev);
+}
+
+#endif /* PVR_POWER_H */
--
2.40.1
