From: Alan Cox Date: Wed, 30 Mar 2011 09:00:05 +0000 (+0100) Subject: staging: gma500: Add Moorestown backlight support X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a7cf87e64a5cd5862381c6e874e58b13d5d54c3a;p=linux-beck.git staging: gma500: Add Moorestown backlight support Which is of course different to Poulsbo. Signed-off-by: Alan Cox Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/gma500/psb_bl.c b/drivers/staging/gma500/psb_bl.c index 70c17b352f9f..a2729fdee8fc 100644 --- a/drivers/staging/gma500/psb_bl.c +++ b/drivers/staging/gma500/psb_bl.c @@ -33,7 +33,6 @@ #define BLC_PWM_FREQ_CALC_CONSTANT 32 #define MHz 1000000 #define BRIGHTNESS_MIN_LEVEL 1 -#define BRIGHTNESS_MAX_LEVEL 100 #define BRIGHTNESS_MASK 0xFF #define BLC_POLARITY_NORMAL 0 #define BLC_POLARITY_INVERSE 1 @@ -59,15 +58,57 @@ int psb_set_brightness(struct backlight_device *bd) DRM_DEBUG_DRIVER("backlight level set to %d\n", level); - /* Perform value bounds checking */ - if (level < BRIGHTNESS_MIN_LEVEL) - level = BRIGHTNESS_MIN_LEVEL; + /* Percentage 1-100% being valid */ + if (level < 1) + level = 1; psb_intel_lvds_set_brightness(dev, level); psb_brightness = level; return 0; } +int mrst_set_brightness(struct backlight_device *bd) +{ + struct drm_device *dev = bl_get_data(psb_backlight_device); + struct drm_psb_private *dev_priv = dev->dev_private; + int level = bd->props.brightness; + u32 blc_pwm_ctl; + u32 max_pwm_blc; + + DRM_DEBUG_DRIVER("backlight level set to %d\n", level); + + /* Percentage 1-100% being valid */ + if (level < 1) + level = 1; + + if (ospm_power_using_hw_begin(OSPM_DISPLAY_ISLAND, OSPM_UHB_ONLY_IF_ON)) { + /* Calculate and set the brightness value */ + max_pwm_blc = REG_READ(BLC_PWM_CTL) >> 16; + blc_pwm_ctl = level * max_pwm_blc / 100; + + /* Adjust the backlight level with the percent in + * dev_priv->blc_adj1; + */ + blc_pwm_ctl = blc_pwm_ctl * dev_priv->blc_adj1; + blc_pwm_ctl = blc_pwm_ctl / 100; + + /* Adjust the backlight level with the percent in + * dev_priv->blc_adj2; + */ + blc_pwm_ctl = blc_pwm_ctl * dev_priv->blc_adj2; + blc_pwm_ctl = blc_pwm_ctl / 100; + + if (blc_pol == BLC_POLARITY_INVERSE) + blc_pwm_ctl = max_pwm_blc - blc_pwm_ctl; + /* force PWM bit on */ + REG_WRITE(BLC_PWM_CTL2, (0x80000000 | REG_READ(BLC_PWM_CTL2))); + REG_WRITE(BLC_PWM_CTL, (max_pwm_blc << 16) | blc_pwm_ctl); + ospm_power_using_hw_end(OSPM_DISPLAY_ISLAND); + } + psb_brightness = level; + return 0; +} + int psb_get_brightness(struct backlight_device *bd) { DRM_DEBUG_DRIVER("brightness = 0x%x\n", psb_brightness); @@ -85,24 +126,33 @@ static const struct backlight_ops psb_ops = { static int device_backlight_init(struct drm_device *dev) { + struct drm_psb_private *dev_priv = dev->dev_private; unsigned long core_clock; /* u32 bl_max_freq; */ /* unsigned long value; */ u16 bl_max_freq; uint32_t value; uint32_t blc_pwm_precision_factor; - struct drm_psb_private *dev_priv = dev->dev_private; - /* get bl_max_freq and pol from dev_priv*/ - if (!dev_priv->lvds_bl) { - DRM_ERROR("Has no valid LVDS backlight info\n"); - return 1; + if (IS_MRST(dev)) { + dev_priv->blc_adj1 = BLC_ADJUSTMENT_MAX; + dev_priv->blc_adj2 = BLC_ADJUSTMENT_MAX; + bl_max_freq = 256; + /* this needs to be set elsewhere */ + blc_pol = BLC_POLARITY_NORMAL; + blc_pwm_precision_factor = BLC_PWM_PRECISION_FACTOR; + } else { + /* get bl_max_freq and pol from dev_priv*/ + if (!dev_priv->lvds_bl) { + DRM_ERROR("Has no valid LVDS backlight info\n"); + return 1; + } + bl_max_freq = dev_priv->lvds_bl->freq; + blc_pol = dev_priv->lvds_bl->pol; + blc_pwm_precision_factor = PSB_BLC_PWM_PRECISION_FACTOR; + blc_brightnesscmd = dev_priv->lvds_bl->brightnesscmd; + blc_type = dev_priv->lvds_bl->type; } - bl_max_freq = dev_priv->lvds_bl->freq; - blc_pol = dev_priv->lvds_bl->pol; - blc_pwm_precision_factor = PSB_BLC_PWM_PRECISION_FACTOR; - blc_brightnesscmd = dev_priv->lvds_bl->brightnesscmd; - blc_type = dev_priv->lvds_bl->type; core_clock = dev_priv->core_freq; @@ -113,16 +163,24 @@ static int device_backlight_init(struct drm_device *dev) if (ospm_power_using_hw_begin(OSPM_DISPLAY_ISLAND, OSPM_UHB_ONLY_IF_ON)) { - /* Check: may be MFLD only */ - if ( - value > (unsigned long long)PSB_BLC_MAX_PWM_REG_FREQ || - value < (unsigned long long)PSB_BLC_MIN_PWM_REG_FREQ) - return 2; - else { - value &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR; - REG_WRITE(BLC_PWM_CTL, - (value << PSB_BACKLIGHT_PWM_CTL_SHIFT) | - (value)); + if (IS_MRST(dev)) { + if (value > (unsigned long long)MRST_BLC_MAX_PWM_REG_FREQ) + return 2; + else { + REG_WRITE(BLC_PWM_CTL2, + (0x80000000 | REG_READ(BLC_PWM_CTL2))); + REG_WRITE(BLC_PWM_CTL, value | (value << 16)); + } + } else { + if (value > (unsigned long long)PSB_BLC_MAX_PWM_REG_FREQ || + value < (unsigned long long)PSB_BLC_MIN_PWM_REG_FREQ) + return 2; + else { + value &= PSB_BACKLIGHT_PWM_POLARITY_BIT_CLEAR; + REG_WRITE(BLC_PWM_CTL, + (value << PSB_BACKLIGHT_PWM_CTL_SHIFT) | + (value)); + } } ospm_power_using_hw_end(OSPM_DISPLAY_ISLAND); } @@ -136,7 +194,7 @@ int psb_backlight_init(struct drm_device *dev) struct backlight_properties props; memset(&props, 0, sizeof(struct backlight_properties)); - props.max_brightness = BRIGHTNESS_MAX_LEVEL; + props.max_brightness = 100; psb_backlight_device = backlight_device_register("psb-bl", NULL, (void *)dev, &psb_ops, &props); @@ -147,8 +205,8 @@ int psb_backlight_init(struct drm_device *dev) if (ret < 0) return ret; - psb_backlight_device->props.brightness = BRIGHTNESS_MAX_LEVEL; - psb_backlight_device->props.max_brightness = BRIGHTNESS_MAX_LEVEL; + psb_backlight_device->props.brightness = 100; + psb_backlight_device->props.max_brightness = 100; backlight_update_status(psb_backlight_device); #endif return 0;