linux-imx

// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright © 2006-2009 Intel Corporation

 *

 * Authors:

 *  Eric Anholt <eric@anholt.net>

 *  Dave Airlie <airlied@linux.ie>

 *  Jesse Barnes <jesse.barnes@intel.com>

 */

​

#include <linux/i2c.h>

#include <drm/drmP.h>

#include <asm/intel-mid.h>

​

#include "intel_bios.h"

#include "psb_drv.h"

#include "psb_intel_drv.h"

#include "psb_intel_reg.h"

#include "power.h"

#include <linux/pm_runtime.h>

​

/* The max/min PWM frequency in BPCR[31:17] - */

/* The smallest number is 1 (not 0) that can fit in the

 * 15-bit field of the and then*/

/* shifts to the left by one bit to get the actual 16-bit

 * value that the 15-bits correspond to.*/

#define MRST_BLC_MAX_PWM_REG_FREQ       0xFFFF

#define BRIGHTNESS_MAX_LEVEL 100

​

/**

 * Sets the power state for the panel.

 */

static void oaktrail_lvds_set_power(struct drm_device *dev,

                struct gma_encoder *gma_encoder,

                bool on)

{

    u32 pp_status;

    struct drm_psb_private *dev_priv = dev->dev_private;

​

    if (!gma_power_begin(dev, true))

        return;

​

    if (on) {

        REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) |

              POWER_TARGET_ON);

        do {

            pp_status = REG_READ(PP_STATUS);

        } while ((pp_status & (PP_ON | PP_READY)) == PP_READY);

        dev_priv->is_lvds_on = true;

        if (dev_priv->ops->lvds_bl_power)

            dev_priv->ops->lvds_bl_power(dev, true);

    } else {

        if (dev_priv->ops->lvds_bl_power)

            dev_priv->ops->lvds_bl_power(dev, false);

        REG_WRITE(PP_CONTROL, REG_READ(PP_CONTROL) &

              ~POWER_TARGET_ON);

        do {

            pp_status = REG_READ(PP_STATUS);

        } while (pp_status & PP_ON);

        dev_priv->is_lvds_on = false;

        pm_request_idle(&dev->pdev->dev);

    }

    gma_power_end(dev);