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Message-ID: <20110330090002.5897.78332.stgit@localhost.localdomain>
Date: Wed, 30 Mar 2011 10:00:05 +0100
From: Alan Cox <alan@...ux.intel.com>
To: greg@...ah.com, linux-kernel@...r.kernel.org
Subject: [PATCH 07/18] gma500: Add Moorestown backlight support
Which is of course different to Poulsbo.
Signed-off-by: Alan Cox <alan@...ux.intel.com>
---
drivers/staging/gma500/psb_bl.c | 112 ++++++++++++++++++++++++++++++---------
1 files changed, 85 insertions(+), 27 deletions(-)
diff --git a/drivers/staging/gma500/psb_bl.c b/drivers/staging/gma500/psb_bl.c
index 70c17b3..a2729fd 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;
--
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