lineage_kernel_xcoverpro/drivers/thermal/isp_cooling.c

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2023-06-18 22:53:49 +00:00
/*
* linux/drivers/thermal/isp_cooling.c
*
* Copyright (C) 2012 Samsung Electronics Co., Ltd(http://www.samsung.com)
* Copyright (C) 2012 Amit Daniel <amit.kachhap@linaro.org>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/module.h>
#include <linux/thermal.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/cpu.h>
#include <linux/isp_cooling.h>
#include <soc/samsung/tmu.h>
#if defined(CONFIG_ECT)
#include <soc/samsung/ect_parser.h>
#endif
#include "samsung/exynos_tmu.h"
/**
* struct isp_cooling_device - data for cooling device with isp
* @id: unique integer value corresponding to each isp_cooling_device
* registered.
* @cool_dev: thermal_cooling_device pointer to keep track of the
* registered cooling device.
* @isp_state: integer value representing the current state of isp
* cooling devices.
* @isp_val: integer value representing the absolute value of the clipped
* fps.
* @allowed_isp: all the isp involved for this isp_cooling_device.
*
* This structure is required for keeping information of each
* isp_cooling_device registered. In order to prevent corruption of this a
* mutex lock cooling_isp_lock is used.
*/
struct isp_cooling_device {
int id;
struct thermal_cooling_device *cool_dev;
unsigned int isp_state;
unsigned int isp_val;
};
static DEFINE_IDR(isp_idr);
static DEFINE_MUTEX(cooling_isp_lock);
static BLOCKING_NOTIFIER_HEAD(isp_notifier);
static unsigned int isp_dev_count;
struct isp_fps_table *isp_fps_table;
/**
* get_idr - function to get a unique id.
* @idr: struct idr * handle used to create a id.
* @id: int * value generated by this function.
*
* This function will populate @id with an unique
* id, using the idr API.
*
* Return: 0 on success, an error code on failure.
*/
static int get_idr(struct idr *idr, int *id)
{
int ret;
mutex_lock(&cooling_isp_lock);
ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
mutex_unlock(&cooling_isp_lock);
if (unlikely(ret < 0))
return ret;
*id = ret;
return 0;
}
/**
* release_idr - function to free the unique id.
* @idr: struct idr * handle used for creating the id.
* @id: int value representing the unique id.
*/
static void release_idr(struct idr *idr, int id)
{
mutex_lock(&cooling_isp_lock);
idr_remove(idr, id);
mutex_unlock(&cooling_isp_lock);
}
/* Below code defines functions to be used for isp as cooling device */
enum isp_cooling_property {
GET_LEVEL,
GET_FPS,
GET_MAXL,
};
/**
* get_property - fetch a property of interest for a give isp.
* @isp: isp for which the property is required
* @input: query parameter
* @output: query return
* @property: type of query (fps, level, max level)
*
* This is the common function to
* 1. get maximum isp cooling states
* 2. translate fps to cooling state
* 3. translate cooling state to fps
* Note that the code may be not in good shape
* but it is written in this way in order to:
* a) reduce duplicate code as most of the code can be shared.
* b) make sure the logic is consistent when translating between
* cooling states and fps.
*
* Return: 0 on success, -EINVAL when invalid parameters are passed.
*/
static int get_property(unsigned int isp, unsigned long input,
unsigned int *output,
enum isp_cooling_property property)
{
int i;
unsigned long max_level = 0, level = 0;
unsigned int fps = ISP_FPS_ENTRY_INVALID;
int descend = -1;
struct isp_fps_table *pos, *table =
isp_fps_table;
if (!output)
return -EINVAL;
if (!table)
return -EINVAL;
isp_fps_for_each_valid_entry(pos, table) {
/* ignore duplicate entry */
if (fps == pos->fps)
continue;
/* get the fps order */
if (fps != ISP_FPS_ENTRY_INVALID && descend == -1)
descend = fps > pos->fps;
fps = pos->fps;
max_level++;
}
/* No valid cpu fps entry */
if (max_level == 0)
return -EINVAL;
/* max_level is an index, not a counter */
max_level--;
/* get max level */
if (property == GET_MAXL) {
*output = (unsigned int)max_level;
return 0;
}
i = 0;
level = (int)input;
isp_fps_for_each_valid_entry(pos, table) {
/* ignore duplicate entry */
if (fps == pos->fps)
continue;
/* now we have a valid fps entry */
fps = pos->fps;
if (property == GET_LEVEL && (unsigned int)input == fps) {
/* get level by fps */
*output = (unsigned int)(descend ? i : (max_level - i));
return 0;
}
if (property == GET_FPS && level == i) {
/* get fps by level */
*output = fps;
return 0;
}
i++;
}
return -EINVAL;
}
/**
* isp_cooling_get_level - for a give isp, return the cooling level.
* @isp: isp for which the level is required
* @fps: the fps of interest
*
* This function will match the cooling level corresponding to the
* requested @fps and return it.
*
* Return: The matched cooling level on success or THERMAL_CSTATE_INVALID
* otherwise.
*/
unsigned long isp_cooling_get_level(unsigned int isp, unsigned int fps)
{
unsigned int val;
if (get_property(isp, (unsigned long)fps, &val, GET_LEVEL))
return THERMAL_CSTATE_INVALID;
return (unsigned long)val;
}
EXPORT_SYMBOL_GPL(isp_cooling_get_level);
static int exynos_isp_cooling_get_level(struct thermal_cooling_device *cdev,
unsigned long value)
{
return isp_cooling_get_level(0, value);
}
/**
* isp_cooling_get_fps - for a give isp, return the fps value corresponding to cooling level.
* @isp: isp for which the level is required
* @level: the cooling level
*
* This function will match the fps value corresponding to the
* requested @level and return it.
*
* Return: The matched fps value on success or ISP_FPS_INVALID otherwise.
*/
unsigned long isp_cooling_get_fps(unsigned int isp, unsigned long level)
{
unsigned int val;
if (get_property(isp, level, &val, GET_FPS))
return ISP_FPS_INVALID;
return (unsigned long)val;
}
/**
* isp_apply_cooling - function to apply fps clipping.
* @isp_device: isp_cooling_device pointer containing fps
* clipping data.
* @cooling_state: value of the cooling state.
*
* Function used to make sure the isp layer is aware of current thermal
* limits. The limits are applied by updating the isp policy.
*
* Return: 0 on success, an error code otherwise (-EINVAL in case wrong
* cooling state).
*/
static int isp_apply_cooling(struct isp_cooling_device *isp_device,
unsigned long cooling_state)
{
/* Check if the old cooling action is same as new cooling action */
if (isp_device->isp_state == cooling_state)
return 0;
isp_device->isp_state = (unsigned int)cooling_state;
blocking_notifier_call_chain(&isp_notifier, ISP_THROTTLING, &cooling_state);
return 0;
}
/* isp cooling device callback functions are defined below */
/**
* isp_get_max_state - callback function to get the max cooling state.
* @cdev: thermal cooling device pointer.
* @state: fill this variable with the max cooling state.
*
* Callback for the thermal cooling device to return the isp
* max cooling state.
*
* Return: 0 on success, an error code otherwise.
*/
static int isp_get_max_state(struct thermal_cooling_device *cdev,
unsigned long *state)
{
unsigned int count = 0;
int ret;
ret = get_property(0, 0, &count, GET_MAXL);
if (count > 0)
*state = count;
return ret;
}
/**
* isp_get_cur_state - callback function to get the current cooling state.
* @cdev: thermal cooling device pointer.
* @state: fill this variable with the current cooling state.
*
* Callback for the thermal cooling device to return the isp
* current cooling state.
*
* Return: 0 on success, an error code otherwise.
*/
static int isp_get_cur_state(struct thermal_cooling_device *cdev,
unsigned long *state)
{
struct isp_cooling_device *isp_device = cdev->devdata;
*state = isp_device->isp_state;
return 0;
}
/**
* isp_set_cur_state - callback function to set the current cooling state.
* @cdev: thermal cooling device pointer.
* @state: set this variable to the current cooling state.
*
* Callback for the thermal cooling device to change the isp
* current cooling state.
*
* Return: 0 on success, an error code otherwise.
*/
static int isp_set_cur_state(struct thermal_cooling_device *cdev,
unsigned long state)
{
struct isp_cooling_device *isp_device = cdev->devdata;
return isp_apply_cooling(isp_device, state);
}
static enum isp_noti_state_t isp_tstate = ISP_COLD;
static int isp_set_cur_temp(struct thermal_cooling_device *cdev,
bool suspended, int temp)
{
enum isp_noti_state_t tstate;
if (suspended || temp < EXYNOS_COLD_TEMP)
tstate = ISP_COLD;
else
tstate = ISP_NORMAL;
if (isp_tstate == tstate)
return 0;
isp_tstate = tstate;
blocking_notifier_call_chain(&isp_notifier, tstate, &tstate);
return 0;
}
/* Bind isp callbacks to thermal cooling device ops */
static struct thermal_cooling_device_ops const isp_cooling_ops = {
.get_max_state = isp_get_max_state,
.get_cur_state = isp_get_cur_state,
.set_cur_state = isp_set_cur_state,
.set_cur_temp = isp_set_cur_temp,
.get_cooling_level = exynos_isp_cooling_get_level,
};
int exynos_tmu_isp_add_notifier(struct notifier_block *n)
{
return blocking_notifier_chain_register(&isp_notifier, n);
}
/**
* __isp_cooling_register - helper function to create isp cooling device
* @np: a valid struct device_node to the cooling device device tree node
* @clip_isp: ispmask of isp where the fps constraints will happen.
*
* This interface function registers the isp cooling device with the name
* "thermal-isp-%x". This api can support multiple instances of isp
* cooling devices. It also gives the opportunity to link the cooling device
* with a device tree node, in order to bind it via the thermal DT code.
*
* Return: a valid struct thermal_cooling_device pointer on success,
* on failure, it returns a corresponding ERR_PTR().
*/
static struct thermal_cooling_device *
__isp_cooling_register(struct device_node *np,
const struct cpumask *clip_isp)
{
struct thermal_cooling_device *cool_dev;
struct isp_cooling_device *isp_dev = NULL;
char dev_name[THERMAL_NAME_LENGTH];
int ret = 0;
isp_dev = kzalloc(sizeof(struct isp_cooling_device),
GFP_KERNEL);
if (!isp_dev)
return ERR_PTR(-ENOMEM);
ret = get_idr(&isp_idr, &isp_dev->id);
if (ret) {
kfree(isp_dev);
return ERR_PTR(-EINVAL);
}
snprintf(dev_name, sizeof(dev_name), "thermal-isp-%d",
isp_dev->id);
cool_dev = thermal_of_cooling_device_register(np, dev_name, isp_dev,
&isp_cooling_ops);
if (IS_ERR(cool_dev)) {
release_idr(&isp_idr, isp_dev->id);
kfree(isp_dev);
return cool_dev;
}
isp_dev->cool_dev = cool_dev;
isp_dev->isp_state = 0;
mutex_lock(&cooling_isp_lock);
isp_dev_count++;
mutex_unlock(&cooling_isp_lock);
return cool_dev;
}
/**
* isp_cooling_register - function to create isp cooling device.
* @clip_isp: cpumask of gpus where the fps constraints will happen.
*
* This interface function registers the isp cooling device with the name
* "thermal-isp-%x". This api can support multiple instances of isp
* cooling devices.
*
* Return: a valid struct thermal_cooling_device pointer on success,
* on failure, it returns a corresponding ERR_PTR().
*/
struct thermal_cooling_device *
isp_cooling_register(const struct cpumask *clip_isp)
{
return __isp_cooling_register(NULL, clip_isp);
}
EXPORT_SYMBOL_GPL(isp_cooling_register);
/**
* of_isp_cooling_register - function to create isp cooling device.
* @np: a valid struct device_node to the cooling device device tree node
* @clip_isp: cpumask of gpus where the fps constraints will happen.
*
* This interface function registers the isp cooling device with the name
* "thermal-isp-%x". This api can support multiple instances of isp
* cooling devices. Using this API, the isp cooling device will be
* linked to the device tree node provided.
*
* Return: a valid struct thermal_cooling_device pointer on success,
* on failure, it returns a corresponding ERR_PTR().
*/
struct thermal_cooling_device *
of_isp_cooling_register(struct device_node *np,
const struct cpumask *clip_isp)
{
if (!np)
return ERR_PTR(-EINVAL);
return __isp_cooling_register(np, clip_isp);
}
EXPORT_SYMBOL_GPL(of_isp_cooling_register);
/**
* isp_cooling_unregister - function to remove isp cooling device.
* @cdev: thermal cooling device pointer.
*
* This interface function unregisters the "thermal-isp-%x" cooling device.
*/
void isp_cooling_unregister(struct thermal_cooling_device *cdev)
{
struct isp_cooling_device *isp_dev;
if (!cdev)
return;
isp_dev = cdev->devdata;
mutex_lock(&cooling_isp_lock);
isp_dev_count--;
mutex_unlock(&cooling_isp_lock);
thermal_cooling_device_unregister(isp_dev->cool_dev);
release_idr(&isp_idr, isp_dev->id);
kfree(isp_dev);
}
EXPORT_SYMBOL_GPL(isp_cooling_unregister);
/**
* isp_cooling_table_init - function to make ISP fps throttling table.
*
* Return : a valid struct isp_fps_table pointer on success,
* on failture, it returns a corresponding ERR_PTR().
*/
static int isp_cooling_table_init(void)
{
int ret = 0, i = 0;
#if defined(CONFIG_ECT)
void *thermal_block;
struct ect_ap_thermal_function *function;
int last_fps = -1, count = 0;
#endif
#if defined(CONFIG_ECT)
thermal_block = ect_get_block(BLOCK_AP_THERMAL);
if (thermal_block == NULL) {
pr_err("Failed to get thermal block");
return -ENODEV;
}
function = ect_ap_thermal_get_function(thermal_block, "ISP");
if (function == NULL) {
pr_err("Failed to get ISP thermal information");
return -ENODEV;
}
/* Table size can be num_of_range + 1 since last row has the value of TABLE_END */
isp_fps_table = kzalloc(sizeof(struct isp_fps_table) * (function->num_of_range + 1), GFP_KERNEL);
for (i = 0; i < function->num_of_range; i++) {
if (last_fps == function->range_list[i].max_frequency)
continue;
isp_fps_table[count].flags = 0;
isp_fps_table[count].driver_data = count;
isp_fps_table[count].fps = function->range_list[i].max_frequency;
last_fps = isp_fps_table[count].fps;
pr_info("[ISP TMU] index : %d, fps : %d\n",
isp_fps_table[count].driver_data, isp_fps_table[count].fps);
count++;
}
if (i == function->num_of_range)
isp_fps_table[count].fps = ISP_FPS_TABLE_END;
#else
pr_err("[ISP cooling] could not find ECT information\n");
ret = -EINVAL;
#endif
return ret;
}
static int __init exynos_isp_cooling_init(void)
{
struct device_node *np;
struct thermal_cooling_device *dev;
int ret = 0;
ret = isp_cooling_table_init();
if (ret) {
pr_err("Fail to initialize isp_cooling_table\n");
return ret;
}
np = of_find_node_by_name(NULL, "fimc_is");
if (!np) {
pr_err("Fail to find device node\n");
return -EINVAL;
}
dev = of_isp_cooling_register(np, 0);
if (IS_ERR(dev)) {
pr_err("Fail to register isp cooling\n");
return -EINVAL;
}
return ret;
}
device_initcall(exynos_isp_cooling_init);