drivers/gpu/drm/gma500/psb_lid.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /**************************************************************************
   3  * Copyright (c) 2007, Intel Corporation.
   4  *
   5  * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
   6  **************************************************************************/
   7
   8 #include <linux/spinlock.h>
   9
  10 #include "psb_drv.h"
  11 #include "psb_intel_reg.h"
  12 #include "psb_reg.h"
  13
  14 static void psb_lid_timer_func(struct timer_list *t)
  15 {
  16         struct drm_psb_private *dev_priv = from_timer(dev_priv, t, lid_timer);
  17         struct drm_device *dev = (struct drm_device *)dev_priv->dev;
  18         struct timer_list *lid_timer = &dev_priv->lid_timer;
  19         unsigned long irq_flags;
  20         u32 __iomem *lid_state = dev_priv->opregion.lid_state;
  21         u32 pp_status;
  22
  23         if (readl(lid_state) == dev_priv->lid_last_state)
  24                 goto lid_timer_schedule;
  25
  26         if ((readl(lid_state)) & 0x01) {
  27                 /*lid state is open*/
  28                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) | POWER_TARGET_ON);
  29                 do {
  30                         pp_status = REG_READ(PP_STATUS);
  31                 } while ((pp_status & PP_ON) == 0 &&
  32                          (pp_status & PP_SEQUENCE_MASK) != 0);
  33
  34                 if (REG_READ(PP_STATUS) & PP_ON) {
  35                         /*FIXME: should be backlight level before*/
  36                         psb_intel_lvds_set_brightness(dev, 100);
  37                 } else {
  38                         DRM_DEBUG("LVDS panel never powered up");
  39                         return;
  40                 }
  41         } else {
  42                 psb_intel_lvds_set_brightness(dev, 0);
  43
  44                 REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) & ~POWER_TARGET_ON);
  45                 do {
  46                         pp_status = REG_READ(PP_STATUS);
  47                 } while ((pp_status & PP_ON) == 0);
  48         }
  49         dev_priv->lid_last_state =  readl(lid_state);
  50
  51 lid_timer_schedule:
  52         spin_lock_irqsave(&dev_priv->lid_lock, irq_flags);
  53         if (!timer_pending(lid_timer)) {
  54                 lid_timer->expires = jiffies + PSB_LID_DELAY;
  55                 add_timer(lid_timer);
  56         }
  57         spin_unlock_irqrestore(&dev_priv->lid_lock, irq_flags);
  58 }
  59
  60 void psb_lid_timer_init(struct drm_psb_private *dev_priv)
  61 {
  62         struct timer_list *lid_timer = &dev_priv->lid_timer;
  63         unsigned long irq_flags;
  64
  65         spin_lock_init(&dev_priv->lid_lock);
  66         spin_lock_irqsave(&dev_priv->lid_lock, irq_flags);
  67
  68         timer_setup(lid_timer, psb_lid_timer_func, 0);
  69
  70         lid_timer->expires = jiffies + PSB_LID_DELAY;
  71
  72         add_timer(lid_timer);
  73         spin_unlock_irqrestore(&dev_priv->lid_lock, irq_flags);
  74 }
  75
  76 void psb_lid_timer_takedown(struct drm_psb_private *dev_priv)
  77 {
  78         del_timer_sync(&dev_priv->lid_timer);
  79 }
  80