LXR linux/drivers/gpu/drm/gma500/psb

   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
  14static 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
  51lid_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
  60void 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
  76void psb_lid_timer_takedown(struct drm_psb_private *dev_priv)
  77{
  78        del_timer_sync(&dev_priv->lid_timer);
  79}
  80
  81