samsung-sm8650/android_kernel_samsung_sm8650-modules
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

disp: msm: limit display brightness max cooling device level

Browse Source 
Based on panel hardware support, display brightness levels can
be very high value. This high value display brightness cooling
device levels can cause exceeding PAGE_SIZE for cooling device stat
buffer. It leads to buffer failure for cooling device stat feature.

Limit display panel mitigation level max to 255. If hardware
supports more than 255, then scale brightness levels fit
into above limit.

Change-Id: Ieeee4ff2aa5cd884819b30b4fd9839e48ac4d804
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>
This commit is contained in:
Manaf Meethalavalappu Pallikunhi
2021-10-18 01:04:21 +05:30
committed by Gerrit - the friendly Code Review server
parent 61963b0791
commit 479a5292e6
2 changed files with 18 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
msm/msm_cooling_device.c
View File

@@ -1,17 +1,19 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2020, The Linux Foundation. All rights reserved.
* Copyright (c) 2020-2021 The Linux Foundation. All rights reserved.
*/
#include <linux/err.h>
#include <linux/slab.h>
#include "msm_cooling_device.h"
#define BRIGHTNESS_CDEV_MAX 255
static int sde_cdev_get_max_brightness(struct thermal_cooling_device *cdev,
unsigned long *state)
{
struct sde_cdev *disp_cdev = (struct sde_cdev *)cdev->devdata;
*state = disp_cdev->bd->props.max_brightness;
*state = disp_cdev->bd->props.max_brightness / disp_cdev->cdev_sf;
return 0;
}
@@ -21,7 +23,8 @@ static int sde_cdev_get_cur_brightness(struct thermal_cooling_device *cdev,
{
struct sde_cdev *disp_cdev = (struct sde_cdev *)cdev->devdata;
*state = disp_cdev->bd->props.max_brightness - disp_cdev->thermal_state;
*state = ((disp_cdev->bd->props.max_brightness -
disp_cdev->thermal_state) / disp_cdev->cdev_sf);
return 0;
}
@@ -32,10 +35,11 @@ static int sde_cdev_set_cur_brightness(struct thermal_cooling_device *cdev,
struct sde_cdev *disp_cdev = (struct sde_cdev *)cdev->devdata;
unsigned long brightness_lvl = 0;
if (state > disp_cdev->bd->props.max_brightness)
if (state > disp_cdev->bd->props.max_brightness / disp_cdev->cdev_sf)
return -EINVAL;
brightness_lvl = disp_cdev->bd->props.max_brightness - state;
brightness_lvl = disp_cdev->bd->props.max_brightness -
(state * disp_cdev->cdev_sf);
if (brightness_lvl == disp_cdev->thermal_state)
return 0;
disp_cdev->thermal_state = brightness_lvl;
@@ -67,6 +71,13 @@ struct sde_cdev *backlight_cdev_register(struct device *dev,
return ERR_PTR(-ENOMEM);
disp_cdev->thermal_state = 0;
disp_cdev->bd = bd;
if (bd->props.max_brightness > BRIGHTNESS_CDEV_MAX)
disp_cdev->cdev_sf = (bd->props.max_brightness /
BRIGHTNESS_CDEV_MAX);
else
disp_cdev->cdev_sf = 1;
disp_cdev->cdev = thermal_of_cooling_device_register(dev->of_node,
(char *)dev_name(&bd->dev), disp_cdev,
&sde_cdev_ops);