mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-22 12:14:01 +08:00
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>
95 lines
2.9 KiB
C
95 lines
2.9 KiB
C
/**************************************************************************
|
|
* Copyright (c) 2007, Intel Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along with
|
|
* this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
|
|
**************************************************************************/
|
|
|
|
#include <drm/drmP.h>
|
|
#include "psb_drv.h"
|
|
#include "psb_reg.h"
|
|
#include "psb_intel_reg.h"
|
|
#include <linux/spinlock.h>
|
|
|
|
static void psb_lid_timer_func(unsigned long data)
|
|
{
|
|
struct drm_psb_private * dev_priv = (struct drm_psb_private *)data;
|
|
struct drm_device *dev = (struct drm_device *)dev_priv->dev;
|
|
struct timer_list *lid_timer = &dev_priv->lid_timer;
|
|
unsigned long irq_flags;
|
|
u32 __iomem *lid_state = dev_priv->opregion.lid_state;
|
|
u32 pp_status;
|
|
|
|
if (readl(lid_state) == dev_priv->lid_last_state)
|
|
goto lid_timer_schedule;
|
|
|
|
if ((readl(lid_state)) & 0x01) {
|
|
/*lid state is open*/
|
|
REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) | POWER_TARGET_ON);
|
|
do {
|
|
pp_status = REG_READ(PP_STATUS);
|
|
} while ((pp_status & PP_ON) == 0 &&
|
|
(pp_status & PP_SEQUENCE_MASK) != 0);
|
|
|
|
if (REG_READ(PP_STATUS) & PP_ON) {
|
|
/*FIXME: should be backlight level before*/
|
|
psb_intel_lvds_set_brightness(dev, 100);
|
|
} else {
|
|
DRM_DEBUG("LVDS panel never powered up");
|
|
return;
|
|
}
|
|
} else {
|
|
psb_intel_lvds_set_brightness(dev, 0);
|
|
|
|
REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) & ~POWER_TARGET_ON);
|
|
do {
|
|
pp_status = REG_READ(PP_STATUS);
|
|
} while ((pp_status & PP_ON) == 0);
|
|
}
|
|
dev_priv->lid_last_state = readl(lid_state);
|
|
|
|
lid_timer_schedule:
|
|
spin_lock_irqsave(&dev_priv->lid_lock, irq_flags);
|
|
if (!timer_pending(lid_timer)) {
|
|
lid_timer->expires = jiffies + PSB_LID_DELAY;
|
|
add_timer(lid_timer);
|
|
}
|
|
spin_unlock_irqrestore(&dev_priv->lid_lock, irq_flags);
|
|
}
|
|
|
|
void psb_lid_timer_init(struct drm_psb_private *dev_priv)
|
|
{
|
|
struct timer_list *lid_timer = &dev_priv->lid_timer;
|
|
unsigned long irq_flags;
|
|
|
|
spin_lock_init(&dev_priv->lid_lock);
|
|
spin_lock_irqsave(&dev_priv->lid_lock, irq_flags);
|
|
|
|
init_timer(lid_timer);
|
|
|
|
lid_timer->data = (unsigned long)dev_priv;
|
|
lid_timer->function = psb_lid_timer_func;
|
|
lid_timer->expires = jiffies + PSB_LID_DELAY;
|
|
|
|
add_timer(lid_timer);
|
|
spin_unlock_irqrestore(&dev_priv->lid_lock, irq_flags);
|
|
}
|
|
|
|
void psb_lid_timer_takedown(struct drm_psb_private *dev_priv)
|
|
{
|
|
del_timer_sync(&dev_priv->lid_timer);
|
|
}
|
|
|