/* * Backlight code for ATI Radeon based graphic cards * * Copyright (c) 2000 Ani Joshi * Copyright (c) 2003 Benjamin Herrenschmidt * Copyright (c) 2006 Michael Hanselmann * * 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 "radeonfb.h" #include #include #ifdef CONFIG_PMAC_BACKLIGHT #include #endif #define MAX_RADEON_LEVEL 0xFF struct radeon_bl_privdata { struct radeonfb_info *rinfo; uint8_t negative; }; static int radeon_bl_get_level_brightness(struct radeon_bl_privdata *pdata, int level) { int rlevel; /* Get and convert the value */ /* No locking of bl_curve since we read a single value */ rlevel = pdata->rinfo->info->bl_curve[level] * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL; if (rlevel < 0) rlevel = 0; else if (rlevel > MAX_RADEON_LEVEL) rlevel = MAX_RADEON_LEVEL; if (pdata->negative) rlevel = MAX_RADEON_LEVEL - rlevel; return rlevel; } static int radeon_bl_update_status(struct backlight_device *bd) { struct radeon_bl_privdata *pdata = bl_get_data(bd); struct radeonfb_info *rinfo = pdata->rinfo; u32 lvds_gen_cntl, tmpPixclksCntl; int level; if (rinfo->mon1_type != MT_LCD) return 0; /* We turn off the LCD completely instead of just dimming the * backlight. This provides some greater power saving and the display * is useless without backlight anyway. */ if (bd->props.power != FB_BLANK_UNBLANK || bd->props.fb_blank != FB_BLANK_UNBLANK) level = 0; else level = bd->props.brightness; del_timer_sync(&rinfo->lvds_timer); radeon_engine_idle(); lvds_gen_cntl = INREG(LVDS_GEN_CNTL); if (level > 0) { lvds_gen_cntl &= ~LVDS_DISPLAY_DIS; if (!(lvds_gen_cntl & LVDS_BLON) || !(lvds_gen_cntl & LVDS_ON)) { lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_DIGON); lvds_gen_cntl |= LVDS_BLON | LVDS_EN; OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK; lvds_gen_cntl |= (radeon_bl_get_level_brightness(pdata, level) << LVDS_BL_MOD_LEVEL_SHIFT); lvds_gen_cntl |= LVDS_ON; lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_BL_MOD_EN); rinfo->pending_lvds_gen_cntl = lvds_gen_cntl; mod_timer(&rinfo->lvds_timer, jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay)); } else { lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK; lvds_gen_cntl |= (radeon_bl_get_level_brightness(pdata, level) << LVDS_BL_MOD_LEVEL_SHIFT); OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); } rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK; rinfo->init_state.lvds_gen_cntl |= rinfo->pending_lvds_gen_cntl & LVDS_STATE_MASK; } else { /* Asic bug, when turning off LVDS_ON, we have to make sure RADEON_PIXCLK_LVDS_ALWAYS_ON bit is off */ tmpPixclksCntl = INPLL(PIXCLKS_CNTL); if (rinfo->is_mobility || rinfo->is_IGP) OUTPLLP(PIXCLKS_CNTL, 0, ~PIXCLK_LVDS_ALWAYS_ONb); lvds_gen_cntl &= ~(LVDS_BL_MOD_LEVEL_MASK | LVDS_BL_MOD_EN); lvds_gen_cntl |= (radeon_bl_get_level_brightness(pdata, 0) << LVDS_BL_MOD_LEVEL_SHIFT); lvds_gen_cntl |= LVDS_DISPLAY_DIS; OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); udelay(100); lvds_gen_cntl &= ~(LVDS_ON | LVDS_EN); OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); lvds_gen_cntl &= ~(LVDS_DIGON); rinfo->pending_lvds_gen_cntl = lvds_gen_cntl; mod_timer(&rinfo->lvds_timer, jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay)); if (rinfo->is_mobility || rinfo->is_IGP) OUTPLL(PIXCLKS_CNTL, tmpPixclksCntl); } rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK; rinfo->init_state.lvds_gen_cntl |= (lvds_gen_cntl & LVDS_STATE_MASK); return 0; } static const struct backlight_ops radeon_bl_data = { .update_status = radeon_bl_update_status, }; void radeonfb_bl_init(struct radeonfb_info *rinfo) { struct backlight_properties props; struct backlight_device *bd; struct radeon_bl_privdata *pdata; char name[12]; if (rinfo->mon1_type != MT_LCD) return; #ifdef CONFIG_PMAC_BACKLIGHT if (!pmac_has_backlight_type("ati") && !pmac_has_backlight_type("mnca")) return; #endif pdata = kmalloc(sizeof(struct radeon_bl_privdata), GFP_KERNEL); if (!pdata) { printk("radeonfb: Memory allocation failed\n"); goto error; } snprintf(name, sizeof(name), "radeonbl%d", rinfo->info->node); memset(&props, 0, sizeof(struct backlight_properties)); props.type = BACKLIGHT_RAW; props.max_brightness = FB_BACKLIGHT_LEVELS - 1; bd = backlight_device_register(name, rinfo->info->dev, pdata, &radeon_bl_data, &props); if (IS_ERR(bd)) { rinfo->info->bl_dev = NULL; printk("radeonfb: Backlight registration failed\n"); goto error; } pdata->rinfo = rinfo; /* Pardon me for that hack... maybe some day we can figure out in what * direction backlight should work on a given panel? */ pdata->negative = (rinfo->family != CHIP_FAMILY_RV200 && rinfo->family != CHIP_FAMILY_RV250 && rinfo->family != CHIP_FAMILY_RV280 && rinfo->family != CHIP_FAMILY_RV350); #ifdef CONFIG_PMAC_BACKLIGHT pdata->negative = pdata->negative || of_machine_is_compatible("PowerBook4,3") || of_machine_is_compatible("PowerBook6,3") || of_machine_is_compatible("PowerBook6,5"); #endif rinfo->info->bl_dev = bd; fb_bl_default_curve(rinfo->info, 0, 63 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL, 217 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL); bd->props.brightness = bd->props.max_brightness; bd->props.power = FB_BLANK_UNBLANK; backlight_update_status(bd); printk("radeonfb: Backlight initialized (%s)\n", name); return; error: kfree(pdata); return; } void radeonfb_bl_exit(struct radeonfb_info *rinfo) { struct backlight_device *bd = rinfo->info->bl_dev; if (bd) { struct radeon_bl_privdata *pdata; pdata = bl_get_data(bd); backlight_device_unregister(bd); kfree(pdata); rinfo->info->bl_dev = NULL; printk("radeonfb: Backlight unloaded\n"); } } ass='commit-subject'>tracing: Fix hwlat kthread migration
The hwlat tracer creates a kernel thread at start of the tracer. It is pinned to a single CPU and will move to the next CPU after each period of running. If the user modifies the migration thread's affinity, it will not change after that happens. The original code created the thread at the first instance it was called, but later was changed to destroy the thread after the tracer was finished, and would not be created until the next instance of the tracer was established. The code that initialized the affinity was only called on the initial instantiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'include/crypto')