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// SPDX-License-Identifier: GPL-2.0-only OR MIT
/* Copyright (c) 2023 Imagination Technologies Ltd. */
#include "pvr_device.h"
#include "pvr_fw.h"
#include "pvr_power.h"
#include "pvr_rogue_fwif.h"
#include <drm/drm_drv.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/timer.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#define POWER_SYNC_TIMEOUT_US (1000000) /* 1s */
#define WATCHDOG_TIME_MS (500)
static int
pvr_power_send_command(struct pvr_device *pvr_dev, struct rogue_fwif_kccb_cmd *pow_cmd)
{
/* TODO: implement */
return -ENODEV;
}
static 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);
}
static 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, bool hard_reset)
{
if (!hard_reset) {
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->sched_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)
goto out_requeue;
stalled = pvr_watchdog_kccb_stalled(pvr_dev);
if (stalled) {
drm_err(from_pvr_device(pvr_dev), "FW stalled, trying hard reset");
pvr_power_reset(pvr_dev, true);
/* Device may be lost at this point. */
}
pm_runtime_put(from_pvr_device(pvr_dev)->dev);
out_requeue:
if (!pvr_dev->lost) {
queue_delayed_work(pvr_dev->sched_wq, &pvr_dev->watchdog.work,
msecs_to_jiffies(WATCHDOG_TIME_MS));
}
}
/**
* pvr_watchdog_init() - Initialise watchdog for device
* @pvr_dev: Target PowerVR device.
*
* Returns:
* * 0 on success, or
* * -%ENOMEM on out of memory.
*/
int
pvr_watchdog_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);
int idx;
if (!drm_dev_enter(drm_dev, &idx))
return -EIO;
clk_disable_unprepare(pvr_dev->mem_clk);
clk_disable_unprepare(pvr_dev->sys_clk);
clk_disable_unprepare(pvr_dev->core_clk);
drm_dev_exit(idx);
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 idx;
int err;
if (!drm_dev_enter(drm_dev, &idx))
return -EIO;
err = clk_prepare_enable(pvr_dev->core_clk);
if (err)
goto err_drm_dev_exit;
err = clk_prepare_enable(pvr_dev->sys_clk);
if (err)
goto err_core_clk_disable;
err = clk_prepare_enable(pvr_dev->mem_clk);
if (err)
goto err_sys_clk_disable;
drm_dev_exit(idx);
return 0;
err_sys_clk_disable:
clk_disable_unprepare(pvr_dev->sys_clk);
err_core_clk_disable:
clk_disable_unprepare(pvr_dev->core_clk);
err_drm_dev_exit:
drm_dev_exit(idx);
return err;
}
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;
}
/**
* pvr_power_reset() - Reset the GPU
* @pvr_dev: Device pointer
* @hard_reset: %true for hard reset, %false for soft reset
*
* If @hard_reset is %false and the FW processor fails to respond during the reset process, this
* function will attempt a hard reset.
*
* If a hard reset fails then the GPU device is reported as lost.
*
* Returns:
* * 0 on success, or
* * Any error code returned by pvr_power_get, pvr_power_fw_disable or pvr_power_fw_enable().
*/
int
pvr_power_reset(struct pvr_device *pvr_dev, bool hard_reset)
{
/* TODO: Implement hard reset. */
int err;
/*
* Take a power reference during the reset. This should prevent any interference with the
* power state during reset.
*/
WARN_ON(pvr_power_get(pvr_dev));
err = pvr_power_fw_disable(pvr_dev, false);
if (err)
goto err_power_put;
err = pvr_power_fw_enable(pvr_dev);
err_power_put:
pvr_power_put(pvr_dev);
return err;
}
/**
* pvr_watchdog_fini() - Shutdown watchdog for device
* @pvr_dev: Target PowerVR device.
*/
void
pvr_watchdog_fini(struct pvr_device *pvr_dev)
{
cancel_delayed_work_sync(&pvr_dev->watchdog.work);
}
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