kernel/drivers/gpu/drm/gma500/psb_lid.c

   1 /**************************************************************************
   2  * Copyright (c) 2007, Intel Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  16  *
  17  * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
  18  **************************************************************************/
  19
  20 #include <drm/drmP.h>
  21 #include "psb_drv.h"
  22 #include "psb_reg.h"
  23 #include "psb_intel_reg.h"
  24 #include <linux/spinlock.h>
  25
  26 static void psb_lid_timer_func(unsigned long data)
  27 {
  28         struct drm_psb_private * dev_priv = (struct drm_psb_private *)data;
  29         struct drm_device *dev = (struct drm_device *)dev_priv->dev;
  30         struct timer_list *lid_timer = &dev_priv->lid_timer;
  31         unsigned long irq_flags;
  32         u32 __iomem *lid_state = dev_priv->opregion.lid_state;
  33         u32 pp_status;
  34
  35         if (readl(lid_state) == dev_priv->lid_last_state)
  36                 goto lid_timer_schedule;
  37
  38         if ((readl(lid_state)) & 0x01) {
  39                 /*lid state is open*/
  40                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) | POWER_TARGET_ON);
  41                 do {
  42                         pp_status = REG_READ(PP_STATUS);
  43                 } while ((pp_status & PP_ON) == 0 &&
  44                          (pp_status & PP_SEQUENCE_MASK) != 0);
  45
  46                 if (REG_READ(PP_STATUS) & PP_ON) {
  47                         /*FIXME: should be backlight level before*/
  48                         psb_intel_lvds_set_brightness(dev, 100);
  49                 } else {
  50                         DRM_DEBUG("LVDS panel never powered up");
  51                         return;
  52                 }
  53         } else {
  54                 psb_intel_lvds_set_brightness(dev, 0);
  55
  56                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) & ~POWER_TARGET_ON);
  57                 do {
  58                         pp_status = REG_READ(PP_STATUS);
  59                 } while ((pp_status & PP_ON) == 0);
  60         }
  61         dev_priv->lid_last_state =  readl(lid_state);
  62
  63 lid_timer_schedule:
  64         spin_lock_irqsave(&dev_priv->lid_lock, irq_flags);
  65         if (!timer_pending(lid_timer)) {
  66                 lid_timer->expires = jiffies + PSB_LID_DELAY;
  67                 add_timer(lid_timer);
  68         }
  69         spin_unlock_irqrestore(&dev_priv->lid_lock, irq_flags);
  70 }
  71
  72 void psb_lid_timer_init(struct drm_psb_private *dev_priv)
  73 {
  74         struct timer_list *lid_timer = &dev_priv->lid_timer;
  75         unsigned long irq_flags;
  76
  77         spin_lock_init(&dev_priv->lid_lock);
  78         spin_lock_irqsave(&dev_priv->lid_lock, irq_flags);
  79
  80         init_timer(lid_timer);
  81
  82         lid_timer->data = (unsigned long)dev_priv;
  83         lid_timer->function = psb_lid_timer_func;
  84         lid_timer->expires = jiffies + PSB_LID_DELAY;
  85
  86         add_timer(lid_timer);
  87         spin_unlock_irqrestore(&dev_priv->lid_lock, irq_flags);
  88 }
  89
  90 void psb_lid_timer_takedown(struct drm_psb_private *dev_priv)
  91 {
  92         del_timer_sync(&dev_priv->lid_timer);
  93 }
  94