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28ee086d5b
backlight_device->sem has a very specific use as documented in the header file. The external users of this are using it for a different reason, to serialise access to the update_status() method. backlight users were supposed to implement their own internal serialisation of update_status() if needed but everyone is doing things differently and incorrectly. Therefore add a global mutex to take care of serialisation for everyone, once and for all. Locking for get_brightness remains optional since most users don't need it. Also update the lcd class in a similar way. Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
244 lines
6.6 KiB
C
244 lines
6.6 KiB
C
/*
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* Backlight code for ATI Radeon based graphic cards
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*
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* Copyright (c) 2000 Ani Joshi <ajoshi@kernel.crashing.org>
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* Copyright (c) 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org>
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* Copyright (c) 2006 Michael Hanselmann <linux-kernel@hansmi.ch>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include "radeonfb.h"
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#include <linux/backlight.h>
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#ifdef CONFIG_PMAC_BACKLIGHT
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#include <asm/backlight.h>
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#endif
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#define MAX_RADEON_LEVEL 0xFF
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static struct backlight_properties radeon_bl_data;
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struct radeon_bl_privdata {
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struct radeonfb_info *rinfo;
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uint8_t negative;
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};
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static int radeon_bl_get_level_brightness(struct radeon_bl_privdata *pdata,
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int level)
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{
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struct fb_info *info = pdata->rinfo->info;
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int rlevel;
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mutex_lock(&info->bl_mutex);
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/* Get and convert the value */
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rlevel = pdata->rinfo->info->bl_curve[level] *
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FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL;
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mutex_unlock(&info->bl_mutex);
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if (rlevel < 0)
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rlevel = 0;
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else if (rlevel > MAX_RADEON_LEVEL)
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rlevel = MAX_RADEON_LEVEL;
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if (pdata->negative)
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rlevel = MAX_RADEON_LEVEL - rlevel;
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return rlevel;
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}
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static int radeon_bl_update_status(struct backlight_device *bd)
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{
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struct radeon_bl_privdata *pdata = class_get_devdata(&bd->class_dev);
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struct radeonfb_info *rinfo = pdata->rinfo;
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u32 lvds_gen_cntl, tmpPixclksCntl;
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int level;
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if (rinfo->mon1_type != MT_LCD)
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return 0;
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/* We turn off the LCD completely instead of just dimming the
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* backlight. This provides some greater power saving and the display
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* is useless without backlight anyway.
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*/
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if (bd->props->power != FB_BLANK_UNBLANK ||
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bd->props->fb_blank != FB_BLANK_UNBLANK)
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level = 0;
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else
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level = bd->props->brightness;
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del_timer_sync(&rinfo->lvds_timer);
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radeon_engine_idle();
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lvds_gen_cntl = INREG(LVDS_GEN_CNTL);
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if (level > 0) {
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lvds_gen_cntl &= ~LVDS_DISPLAY_DIS;
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if (!(lvds_gen_cntl & LVDS_BLON) || !(lvds_gen_cntl & LVDS_ON)) {
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lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_DIGON);
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lvds_gen_cntl |= LVDS_BLON | LVDS_EN;
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OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
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lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK;
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lvds_gen_cntl |=
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(radeon_bl_get_level_brightness(pdata, level) <<
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LVDS_BL_MOD_LEVEL_SHIFT);
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lvds_gen_cntl |= LVDS_ON;
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lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_BL_MOD_EN);
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rinfo->pending_lvds_gen_cntl = lvds_gen_cntl;
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mod_timer(&rinfo->lvds_timer,
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jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay));
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} else {
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lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK;
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lvds_gen_cntl |=
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(radeon_bl_get_level_brightness(pdata, level) <<
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LVDS_BL_MOD_LEVEL_SHIFT);
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OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
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}
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rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK;
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rinfo->init_state.lvds_gen_cntl |= rinfo->pending_lvds_gen_cntl
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& LVDS_STATE_MASK;
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} else {
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/* Asic bug, when turning off LVDS_ON, we have to make sure
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RADEON_PIXCLK_LVDS_ALWAYS_ON bit is off
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*/
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tmpPixclksCntl = INPLL(PIXCLKS_CNTL);
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if (rinfo->is_mobility || rinfo->is_IGP)
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OUTPLLP(PIXCLKS_CNTL, 0, ~PIXCLK_LVDS_ALWAYS_ONb);
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lvds_gen_cntl &= ~(LVDS_BL_MOD_LEVEL_MASK | LVDS_BL_MOD_EN);
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lvds_gen_cntl |= (radeon_bl_get_level_brightness(pdata, 0) <<
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LVDS_BL_MOD_LEVEL_SHIFT);
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lvds_gen_cntl |= LVDS_DISPLAY_DIS;
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OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
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udelay(100);
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lvds_gen_cntl &= ~(LVDS_ON | LVDS_EN);
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OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
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lvds_gen_cntl &= ~(LVDS_DIGON);
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rinfo->pending_lvds_gen_cntl = lvds_gen_cntl;
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mod_timer(&rinfo->lvds_timer,
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jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay));
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if (rinfo->is_mobility || rinfo->is_IGP)
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OUTPLL(PIXCLKS_CNTL, tmpPixclksCntl);
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}
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rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK;
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rinfo->init_state.lvds_gen_cntl |= (lvds_gen_cntl & LVDS_STATE_MASK);
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return 0;
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}
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static int radeon_bl_get_brightness(struct backlight_device *bd)
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{
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return bd->props->brightness;
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}
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static struct backlight_properties radeon_bl_data = {
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.get_brightness = radeon_bl_get_brightness,
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.update_status = radeon_bl_update_status,
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.max_brightness = (FB_BACKLIGHT_LEVELS - 1),
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};
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void radeonfb_bl_init(struct radeonfb_info *rinfo)
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{
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struct backlight_device *bd;
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struct radeon_bl_privdata *pdata;
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char name[12];
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if (rinfo->mon1_type != MT_LCD)
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return;
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#ifdef CONFIG_PMAC_BACKLIGHT
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if (!pmac_has_backlight_type("ati") &&
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!pmac_has_backlight_type("mnca"))
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return;
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#endif
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pdata = kmalloc(sizeof(struct radeon_bl_privdata), GFP_KERNEL);
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if (!pdata) {
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printk("radeonfb: Memory allocation failed\n");
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goto error;
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}
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snprintf(name, sizeof(name), "radeonbl%d", rinfo->info->node);
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bd = backlight_device_register(name, rinfo->info->dev, pdata, &radeon_bl_data);
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if (IS_ERR(bd)) {
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rinfo->info->bl_dev = NULL;
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printk("radeonfb: Backlight registration failed\n");
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goto error;
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}
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pdata->rinfo = rinfo;
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/* Pardon me for that hack... maybe some day we can figure out in what
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* direction backlight should work on a given panel?
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*/
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pdata->negative =
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(rinfo->family != CHIP_FAMILY_RV200 &&
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rinfo->family != CHIP_FAMILY_RV250 &&
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rinfo->family != CHIP_FAMILY_RV280 &&
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rinfo->family != CHIP_FAMILY_RV350);
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#ifdef CONFIG_PMAC_BACKLIGHT
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pdata->negative = pdata->negative ||
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machine_is_compatible("PowerBook4,3") ||
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machine_is_compatible("PowerBook6,3") ||
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machine_is_compatible("PowerBook6,5");
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#endif
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mutex_lock(&rinfo->info->bl_mutex);
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rinfo->info->bl_dev = bd;
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fb_bl_default_curve(rinfo->info, 0,
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63 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL,
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217 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL);
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mutex_unlock(&rinfo->info->bl_mutex);
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bd->props->brightness = radeon_bl_data.max_brightness;
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bd->props->power = FB_BLANK_UNBLANK;
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backlight_update_status(bd);
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#ifdef CONFIG_PMAC_BACKLIGHT
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mutex_lock(&pmac_backlight_mutex);
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if (!pmac_backlight)
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pmac_backlight = bd;
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mutex_unlock(&pmac_backlight_mutex);
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#endif
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printk("radeonfb: Backlight initialized (%s)\n", name);
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return;
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error:
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kfree(pdata);
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return;
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}
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void radeonfb_bl_exit(struct radeonfb_info *rinfo)
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{
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#ifdef CONFIG_PMAC_BACKLIGHT
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mutex_lock(&pmac_backlight_mutex);
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#endif
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mutex_lock(&rinfo->info->bl_mutex);
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if (rinfo->info->bl_dev) {
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struct radeon_bl_privdata *pdata;
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#ifdef CONFIG_PMAC_BACKLIGHT
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if (pmac_backlight == rinfo->info->bl_dev)
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pmac_backlight = NULL;
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#endif
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pdata = class_get_devdata(&rinfo->info->bl_dev->class_dev);
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backlight_device_unregister(rinfo->info->bl_dev);
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kfree(pdata);
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rinfo->info->bl_dev = NULL;
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printk("radeonfb: Backlight unloaded\n");
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}
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mutex_unlock(&rinfo->info->bl_mutex);
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#ifdef CONFIG_PMAC_BACKLIGHT
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mutex_unlock(&pmac_backlight_mutex);
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#endif
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}
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