ac0a5dd6ae
Some devices don't have a panel connected to LVDS and thus will never power up. This patch checks the power sequence progress bits in PP_STATUS to prevent an endless loop on such devices. Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
/**************************************************************************
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* Copyright (c) 2007, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
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**************************************************************************/
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#include <drm/drmP.h>
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#include "psb_drv.h"
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#include "psb_reg.h"
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#include "psb_intel_reg.h"
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#include <linux/spinlock.h>
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static void psb_lid_timer_func(unsigned long data)
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{
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struct drm_psb_private * dev_priv = (struct drm_psb_private *)data;
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struct drm_device *dev = (struct drm_device *)dev_priv->dev;
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struct timer_list *lid_timer = &dev_priv->lid_timer;
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unsigned long irq_flags;
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u32 __iomem *lid_state = dev_priv->opregion.lid_state;
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u32 pp_status;
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if (readl(lid_state) == dev_priv->lid_last_state)
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goto lid_timer_schedule;
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if ((readl(lid_state)) & 0x01) {
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/*lid state is open*/
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REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) | POWER_TARGET_ON);
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do {
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pp_status = REG_READ(PP_STATUS);
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} while ((pp_status & PP_ON) == 0 &&
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(pp_status & PP_SEQUENCE_MASK) != 0);
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if (REG_READ(PP_STATUS) & PP_ON) {
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/*FIXME: should be backlight level before*/
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psb_intel_lvds_set_brightness(dev, 100);
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} else {
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DRM_DEBUG("LVDS panel never powered up");
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return;
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}
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} else {
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psb_intel_lvds_set_brightness(dev, 0);
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REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) & ~POWER_TARGET_ON);
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do {
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pp_status = REG_READ(PP_STATUS);
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} while ((pp_status & PP_ON) == 0);
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}
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dev_priv->lid_last_state = readl(lid_state);
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lid_timer_schedule:
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spin_lock_irqsave(&dev_priv->lid_lock, irq_flags);
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if (!timer_pending(lid_timer)) {
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lid_timer->expires = jiffies + PSB_LID_DELAY;
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add_timer(lid_timer);
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}
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spin_unlock_irqrestore(&dev_priv->lid_lock, irq_flags);
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}
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void psb_lid_timer_init(struct drm_psb_private *dev_priv)
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{
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struct timer_list *lid_timer = &dev_priv->lid_timer;
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unsigned long irq_flags;
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spin_lock_init(&dev_priv->lid_lock);
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spin_lock_irqsave(&dev_priv->lid_lock, irq_flags);
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init_timer(lid_timer);
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lid_timer->data = (unsigned long)dev_priv;
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lid_timer->function = psb_lid_timer_func;
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lid_timer->expires = jiffies + PSB_LID_DELAY;
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add_timer(lid_timer);
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spin_unlock_irqrestore(&dev_priv->lid_lock, irq_flags);
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}
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void psb_lid_timer_takedown(struct drm_psb_private *dev_priv)
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{
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del_timer_sync(&dev_priv->lid_timer);
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}
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