@@ -28,6 +28,7 @@
#include <linux/uaccess.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
+#include <linux/cpufreq.h>
#include <video/da8xx-fb.h>
#define DRIVER_NAME "da8xx_lcdc"
@@ -114,6 +115,9 @@ struct da8xx_fb_par {
unsigned int databuf_sz;
unsigned int palette_sz;
unsigned int pxl_clk;
+#ifdef CONFIG_CPU_FREQ
+ struct notifier_block freq_transition;
+#endif
};
/* Variable Screen Information */
@@ -586,6 +590,41 @@ static int fb_check_var(struct fb_var_screeninfo *var,
return err;
}
+#ifdef CONFIG_CPU_FREQ
+static int lcd_da8xx_cpufreq_transition(struct notifier_block *nb,
+ unsigned long val, void *data)
+{
+ struct da8xx_fb_par *par;
+ unsigned int reg;
+
+ par = container_of(nb, struct da8xx_fb_par, freq_transition);
+ if (val == CPUFREQ_PRECHANGE) {
+ reg = lcdc_read(LCD_RASTER_CTRL_REG);
+ lcdc_write(reg & ~LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
+ } else if (val == CPUFREQ_POSTCHANGE) {
+ lcd_calc_clk_divider(par);
+ reg = lcdc_read(LCD_RASTER_CTRL_REG);
+ lcdc_write(reg | LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
+ }
+
+ return 0;
+}
+
+static inline int lcd_da8xx_cpufreq_register(struct da8xx_fb_par *par)
+{
+ par->freq_transition.notifier_call = lcd_da8xx_cpufreq_transition;
+
+ return cpufreq_register_notifier(&par->freq_transition,
+ CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+static inline void lcd_da8xx_cpufreq_deregister(struct da8xx_fb_par *par)
+{
+ cpufreq_unregister_notifier(&par->freq_transition,
+ CPUFREQ_TRANSITION_NOTIFIER);
+}
+#endif
+
static int __devexit fb_remove(struct platform_device *dev)
{
struct fb_info *info = dev_get_drvdata(&dev->dev);
@@ -593,6 +632,9 @@ static int __devexit fb_remove(struct platform_device *dev)
if (info) {
struct da8xx_fb_par *par = info->par;
+#ifdef CONFIG_CPU_FREQ
+ lcd_da8xx_cpufreq_deregister(par);
+#endif
if (lcdc_read(LCD_RASTER_CTRL_REG) & LCD_RASTER_ENABLE)
lcd_disable_raster(par);
lcdc_write(0, LCD_RASTER_CTRL_REG);
@@ -823,12 +865,25 @@ static int __init fb_probe(struct platform_device *device)
goto err_dealloc_cmap;
}
+#ifdef CONFIG_CPU_FREQ
+ ret = lcd_da8xx_cpufreq_register(par);
+ if (ret) {
+ dev_err(&device->dev, "failed to register cpufreq\n");
+ goto err_cpu_freq;
+ }
+#endif
+
/* enable raster engine */
lcdc_write(lcdc_read(LCD_RASTER_CTRL_REG) |
LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
return 0;
+#ifdef CONFIG_CPU_FREQ
+err_cpu_freq:
+ unregister_framebuffer(da8xx_fb_info);
+#endif
+
err_dealloc_cmap:
fb_dealloc_cmap(&da8xx_fb_info->cmap);