/* * Sanyo LV5207LP LED Driver * * Copyright (C) 2013 Ideas on board SPRL * * Contact: Laurent Pinchart * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #define LV5207LP_CTRL1 0x00 #define LV5207LP_CPSW (1 << 7) #define LV5207LP_SCTEN (1 << 6) #define LV5207LP_C10 (1 << 5) #define LV5207LP_CKSW (1 << 4) #define LV5207LP_RSW (1 << 3) #define LV5207LP_GSW (1 << 2) #define LV5207LP_BSW (1 << 1) #define LV5207LP_CTRL2 0x01 #define LV5207LP_MSW (1 << 7) #define LV5207LP_MLED4 (1 << 6) #define LV5207LP_RED 0x02 #define LV5207LP_GREEN 0x03 #define LV5207LP_BLUE 0x04 #define LV5207LP_MAX_BRIGHTNESS 32 struct lv5207lp { struct i2c_client *client; struct backlight_device *backlight; struct lv5207lp_platform_data *pdata; }; static int lv5207lp_write(struct lv5207lp *lv, u8 reg, u8 data) { return i2c_smbus_write_byte_data(lv->client, reg, data); } static int lv5207lp_backlight_update_status(struct backlight_device *backlight) { struct lv5207lp *lv = bl_get_data(backlight); int brightness = backlight->props.brightness; if (backlight->props.power != FB_BLANK_UNBLANK || backlight->props.fb_blank != FB_BLANK_UNBLANK || backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK)) brightness = 0; if (brightness) { lv5207lp_write(lv, LV5207LP_CTRL1, LV5207LP_CPSW | LV5207LP_C10 | LV5207LP_CKSW); lv5207lp_write(lv, LV5207LP_CTRL2, LV5207LP_MSW | LV5207LP_MLED4 | (brightness - 1)); } else { lv5207lp_write(lv, LV5207LP_CTRL1, 0); lv5207lp_write(lv, LV5207LP_CTRL2, 0); } return 0; } static int lv5207lp_backlight_check_fb(struct backlight_device *backlight, struct fb_info *info) { struct lv5207lp *lv = bl_get_data(backlight); return lv->pdata->fbdev == NULL || lv->pdata->fbdev == info->dev; } static const struct backlight_ops lv5207lp_backlight_ops = { .options = BL_CORE_SUSPENDRESUME, .update_status = lv5207lp_backlight_update_status, .check_fb = lv5207lp_backlight_check_fb, }; static int lv5207lp_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct lv5207lp_platform_data *pdata = dev_get_platdata(&client->dev); struct backlight_device *backlight; struct backlight_properties props; struct lv5207lp *lv; if (pdata == NULL) { dev_err(&client->dev, "No platform data supplied\n"); return -EINVAL; } if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { dev_warn(&client->dev, "I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n"); return -EIO; } lv = devm_kzalloc(&client->dev, sizeof(*lv), GFP_KERNEL); if (!lv) return -ENOMEM; lv->client = client; lv->pdata = pdata; memset(&props, 0, sizeof(props)); props.type = BACKLIGHT_RAW; props.max_brightness = min_t(unsigned int, pdata->max_value, LV5207LP_MAX_BRIGHTNESS); props.brightness = clamp_t(unsigned int, pdata->def_value, 0, props.max_brightness); backlight = devm_backlight_device_register(&client->dev, dev_name(&client->dev), &lv->client->dev, lv, &lv5207lp_backlight_ops, &props); if (IS_ERR(backlight)) { dev_err(&client->dev, "failed to register backlight\n"); return PTR_ERR(backlight); } backlight_update_status(backlight); i2c_set_clientdata(client, backlight); return 0; } static int lv5207lp_remove(struct i2c_client *client) { struct backlight_device *backlight = i2c_get_clientdata(client); backlight->props.brightness = 0; backlight_update_status(backlight); return 0; } static const struct i2c_device_id lv5207lp_ids[] = { { "lv5207lp", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, lv5207lp_ids); static struct i2c_driver lv5207lp_driver = { .driver = { .name = "lv5207lp", }, .probe = lv5207lp_probe, .remove = lv5207lp_remove, .id_table = lv5207lp_ids, }; module_i2c_driver(lv5207lp_driver); MODULE_DESCRIPTION("Sanyo LV5207LP Backlight Driver"); MODULE_AUTHOR("Laurent Pinchart "); MODULE_LICENSE("GPL"); tion value='2'>stat only
authorThomas Gleixner <tglx@linutronix.de>2017-01-31 09:37:34 +0100
committerThomas Gleixner <tglx@linutronix.de>2017-01-31 21:47:58 +0100
commit0becc0ae5b42828785b589f686725ff5bc3b9b25 (patch)
treebe6d0e1f37c38ed0a7dd5da2d4b1e93f0fb43101 /include/drm/drm_vma_manager.h
parent24c2503255d35c269b67162c397a1a1c1e02f6ce (diff)
x86/mce: Make timer handling more robust
Erik reported that on a preproduction hardware a CMCI storm triggers the BUG_ON in add_timer_on(). The reason is that the per CPU MCE timer is started by the CMCI logic before the MCE CPU hotplug callback starts the timer with add_timer_on(). So the timer is already queued which triggers the BUG. Using add_timer_on() is pretty pointless in this code because the timer is strictlty per CPU, initialized as pinned and all operations which arm the timer happen on the CPU to which the timer belongs. Simplify the whole machinery by using mod_timer() instead of add_timer_on() which avoids the problem because mod_timer() can handle already queued timers. Use __start_timer() everywhere so the earliest armed expiry time is preserved. Reported-by: Erik Veijola <erik.veijola@intel.com> Tested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@alien8.de> Cc: Tony Luck <tony.luck@intel.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.20.1701310936080.3457@nanos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/drm/drm_vma_manager.h')