gfx: CABC: Setting changes

This patch changes PWM frequency to 5KHz for better VR efficiency
and other CABC settings for better power savings.

Issue: ANDROID-1551
Signed-off-by: Yong-Joon.Park <yong-joon.park@intel.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

diff --git a/drivers/staging/mrst/drv/tc35876x-dsi-lvds.c b/drivers/staging/mrst/drv/tc35876x-dsi-lvds.c
index b618ff9..744a1f1 100644 (file)
--- a/drivers/staging/mrst/drv/tc35876x-dsi-lvds.c
+++ b/drivers/staging/mrst/drv/tc35876x-dsi-lvds.c
@@ -466,9 +466,9 @@ static void tc35876x_brightness_init(struct drm_device *dev)
 
        clkdiv = calc_clkdiv(SYSTEMCLK, PWM_FREQUENCY);
 
-       ret = intel_scu_ipc_iowrite8(PWM0CLKDIV1, (clkdiv >> 8) & 0xff);
+       ret = intel_scu_ipc_iowrite8(PWM0CLKDIV1, 0x00);
        if (!ret)
-               ret = intel_scu_ipc_iowrite8(PWM0CLKDIV0, clkdiv & 0xff);
+               ret = intel_scu_ipc_iowrite8(PWM0CLKDIV0, 0x25);
 
        if (ret)
                dev_err(&dev->pdev->dev, "PWM0CLKDIV set failed\n");
@@ -490,11 +490,7 @@ void tc35876x_brightness_control(struct drm_device *dev, int level)
        /* PWM duty cycle 0x00...0x63 corresponds to 0...99% */
        duty_val = level * 0x63 / MDFLD_DSI_BRIGHTNESS_MAX_LEVEL;
 
-       /* I won't pretend to understand this formula. The panel spec is quite
-        * bad engrish.
-        */
-       panel_duty_val = (2 * level - 100) * 0xA9 /
-                        MDFLD_DSI_BRIGHTNESS_MAX_LEVEL + 0x56;
+       panel_duty_val = (230 * (level - 100) / 100) + 255;
 
        ret = intel_scu_ipc_iowrite8(PWM0DUTYCYCLE, duty_val);
        if (ret)
@@ -571,7 +567,7 @@ void tc35876x_toshiba_bridge_panel_on(struct drm_device *dev)
                 * 255-allow_distort*2 value.
                 */
                ret = i2c_smbus_write_byte_data(cmi_lcd_i2c_client,
-                                               PANEL_ALLOW_DISTORT, 0x10);
+                                               PANEL_ALLOW_DISTORT, 0x32);
                if (ret < 0)
                        dev_err(&cmi_lcd_i2c_client->dev,
                                "i2c write failed (%d)\n", ret);
@@ -586,6 +582,25 @@ void tc35876x_toshiba_bridge_panel_on(struct drm_device *dev)
                if (ret < 0)
                        dev_err(&cmi_lcd_i2c_client->dev,
                                "i2c write failed (%d)\n", ret);
+
+               /*changing CABC PWM frequency to 5 Khz */
+               ret = i2c_smbus_write_byte_data(cmi_lcd_i2c_client,
+                                               PANEL_FREQ_DIVIDER_HI, 0xE0);
+               if (ret < 0)
+                       dev_err(&cmi_lcd_i2c_client->dev,
+                               "i2c write failed (%d)\n", ret);
+               ret = i2c_smbus_write_byte_data(cmi_lcd_i2c_client,
+                                               PANEL_FREQ_DIVIDER_LO, 0x64);
+               if (ret < 0)
+                       dev_err(&cmi_lcd_i2c_client->dev,
+                               "i2c write failed (%d)\n", ret);
+
+               /*PANEL_MODIFY_RGB to 0x00 to get rid of flicker*/
+               ret = i2c_smbus_write_byte_data(cmi_lcd_i2c_client,
+                                               PANEL_MODIFY_RGB, 0x00);
+               if (ret < 0)
+                       dev_err(&cmi_lcd_i2c_client->dev,
+                               "i2c write failed (%d)\n", ret);
        }
 
        if (pdata->gpio_panel_bl_en != -1)