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staging: gma500: Add Moorestown backlight support

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Which is of course different to Poulsbo.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox
2011-03-30 10:00:05 +01:00
committed by Greg Kroah-Hartman
parent f4f7868bf9
commit a7cf87e64a
1 changed files with 85 additions and 27 deletions
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112
drivers/staging/gma500/psb_bl.c
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@@ -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;