232 lines
6.6 KiB
C
232 lines
6.6 KiB
C
/*
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* psb backlight using HAL
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*
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* Copyright (c) 2009, 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: Eric Knopp
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*
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*/
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#include <linux/backlight.h>
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#include <linux/version.h>
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#include "psb_drv.h"
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#include "psb_intel_reg.h"
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#include "psb_powermgmt.h"
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#include "mdfld_dsi_dbi.h"
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#define MRST_BLC_MAX_PWM_REG_FREQ 0xFFFF
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#define BLC_PWM_PRECISION_FACTOR 100 /* 10000000 */
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#define BLC_PWM_FREQ_CALC_CONSTANT 32
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#define MHz 1000000
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#define BRIGHTNESS_MIN_LEVEL 1
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#define BRIGHTNESS_INIT_LEVEL 50
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#define BRIGHTNESS_MAX_LEVEL 100
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#define BRIGHTNESS_MASK 0xFF
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#define BLC_POLARITY_NORMAL 0
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#define BLC_POLARITY_INVERSE 1
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#define BLC_ADJUSTMENT_MAX 100
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#define PSB_BLC_PWM_PRECISION_FACTOR 10
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#define PSB_BLC_MAX_PWM_REG_FREQ 0xFFFE
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#define PSB_BLC_MIN_PWM_REG_FREQ 0x2
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#define PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR (0xFFFE)
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#define PSB_BACKLIGHT_PWM_CTL_SHIFT (16)
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int psb_brightness;
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static struct backlight_device *psb_backlight_device;
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u8 blc_pol;
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u8 blc_type;
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int lastFailedBrightness = -1;
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int psb_set_brightness(struct backlight_device *bd)
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{
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struct drm_device *dev;
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struct drm_psb_private *dev_priv;
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struct mdfld_dsi_config **dsi_configs;
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int level;
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u32 blc_pwm_ctl;
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u32 max_pwm_blc;
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bool panel_on1 = false, panel_on2 = false;
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if (!(drm_psb_use_cases_control & PSB_BRIGHTNESS_ENABLE))
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return 0;
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dev = (struct drm_device *)bl_get_data(psb_backlight_device);
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dev_priv = (struct drm_psb_private *)dev->dev_private;
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dsi_configs = dev_priv->dsi_configs;
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if (dsi_configs[0])
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panel_on1 = dsi_configs[0]->dsi_hw_context.panel_on;
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if (dsi_configs[1])
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panel_on2 = dsi_configs[1]->dsi_hw_context.panel_on;
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if(bd != NULL)
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level = bd->props.brightness;
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else
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level = lastFailedBrightness;
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/* Perform value bounds checking */
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if (level < BRIGHTNESS_MIN_LEVEL)
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level = BRIGHTNESS_MIN_LEVEL;
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if(!gbdispstatus){
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PSB_DEBUG_ENTRY("[DISPLAY]: already OFF ignoring brighness " \
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"request\n");
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/* there may exist concurrent racing, the gbdispstatus may
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* haven't been set in gfx_late_resume yet. record here, and
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* we may call brightness setting at the end of gfx_late_resume
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*/
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lastFailedBrightness = level;
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return 0;
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}
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lastFailedBrightness = -1;
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if (ospm_power_using_hw_begin(OSPM_DISPLAY_ISLAND, OSPM_UHB_FORCE_POWER_ON)) {
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if (IS_MRST(dev)) {
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/* Calculate and set the brightness value */
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max_pwm_blc = REG_READ(BLC_PWM_CTL) >> MRST_BACKLIGHT_MODULATION_FREQ_SHIFT;
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blc_pwm_ctl = level * max_pwm_blc / BRIGHTNESS_MAX_LEVEL;
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/* Adjust the backlight level with the percent in
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* dev_priv->blc_adj1;
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*/
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blc_pwm_ctl = blc_pwm_ctl * dev_priv->blc_adj1;
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blc_pwm_ctl = blc_pwm_ctl / BLC_ADJUSTMENT_MAX;
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/* Adjust the backlight level with the percent in
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* dev_priv->blc_adj2;
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*/
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blc_pwm_ctl = blc_pwm_ctl * dev_priv->blc_adj2;
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blc_pwm_ctl = blc_pwm_ctl / BLC_ADJUSTMENT_MAX;
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if (blc_pol == BLC_POLARITY_INVERSE)
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blc_pwm_ctl = max_pwm_blc - blc_pwm_ctl;
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/* force PWM bit on */
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REG_WRITE(BLC_PWM_CTL2, (0x80000000 | REG_READ(BLC_PWM_CTL2)));
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REG_WRITE(BLC_PWM_CTL, (max_pwm_blc << MRST_BACKLIGHT_MODULATION_FREQ_SHIFT) |
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blc_pwm_ctl);
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} else if (IS_MDFLD(dev)) {
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u32 adjusted_level = 0;
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/* Adjust the backlight level with the percent in
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* dev_priv->blc_adj2;
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*/
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adjusted_level = level * dev_priv->blc_adj2;
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adjusted_level =
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adjusted_level / BLC_ADJUSTMENT_MAX / 100;
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dev_priv->brightness_adjusted = adjusted_level;
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#ifndef CONFIG_MDFLD_DSI_DPU
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if (!(dev_priv->dsr_fb_update & MDFLD_DSR_MIPI_CONTROL)
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&& dev_priv->b_dsr_enable
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&& is_cmd_mode_panel(dev)
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&& (panel_on1 || panel_on2)) {
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dev_priv->exit_idle(dev,
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MDFLD_DSR_MIPI_CONTROL,
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0, 0);
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PSB_DEBUG_ENTRY("Out of DSR before set " \
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"brightness to %d.\n",
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adjusted_level);
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}
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#endif
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/* support the main panel brightness control */
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mdfld_dsi_brightness_control(dev, 0, adjusted_level);
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/* support the second panel brightness control */
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if (dev_priv->panel_desc == DISPLAY_C)
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mdfld_dsi_brightness_control(dev, 2, adjusted_level);
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}
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ospm_power_using_hw_end(OSPM_DISPLAY_ISLAND);
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}
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/* cache the brightness for later use */
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psb_brightness = level;
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return 0;
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}
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int psb_get_brightness(struct backlight_device *bd)
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{
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DRM_DEBUG_DRIVER("brightness = 0x%x \n", psb_brightness);
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/* return locally cached var instead of HW read (due to DPST etc.) */
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return psb_brightness;
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}
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const struct backlight_ops psb_ops = {
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.get_brightness = psb_get_brightness,
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.update_status = psb_set_brightness,
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};
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static int device_backlight_init(struct drm_device *dev)
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{
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struct drm_psb_private *dev_priv = (struct drm_psb_private *) dev->dev_private;
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dev_priv->blc_adj1 = BLC_ADJUSTMENT_MAX;
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dev_priv->blc_adj2 = BLC_ADJUSTMENT_MAX * 100;
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return 0;
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}
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int psb_backlight_init(struct drm_device *dev)
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{
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#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
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int ret = 0;
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#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,34))
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psb_backlight_device = backlight_device_register("psb-bl", NULL, (void *)dev, &psb_ops);
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#else
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struct backlight_properties props;
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memset(&props, 0, sizeof(struct backlight_properties));
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props.type = BACKLIGHT_PLATFORM;
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props.max_brightness = BRIGHTNESS_MAX_LEVEL;
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psb_backlight_device = backlight_device_register("psb-bl", NULL, (void *)dev, &psb_ops, &props);
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#endif
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if (IS_ERR(psb_backlight_device))
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return PTR_ERR(psb_backlight_device);
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if ((ret = device_backlight_init(dev)) != 0)
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return ret;
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psb_backlight_device->props.brightness = BRIGHTNESS_INIT_LEVEL;
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psb_backlight_device->props.max_brightness = BRIGHTNESS_MAX_LEVEL;
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backlight_update_status(psb_backlight_device);
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#endif
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return 0;
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}
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void psb_backlight_exit(void)
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{
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#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
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psb_backlight_device->props.brightness = 0;
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backlight_update_status(psb_backlight_device);
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backlight_device_unregister(psb_backlight_device);
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#endif
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return;
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}
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struct backlight_device * psb_get_backlight_device(void)
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{
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#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
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return psb_backlight_device;
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#endif
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return NULL;
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}
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