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davinci: fb: add cpufreq support

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Add cpufreq support for DA8xx/OMAP-L1xx frame buffer driver

Signed-off-by: Chaithrika U S <chaithrika@ti.com>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Cc: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Chaithrika U S 2009-12-15 16:46:29 -08:00 committed by Linus Torvalds
parent 8097b1749f
commit e04e54835f
1 changed files with 55 additions and 0 deletions
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55
drivers/video/da8xx-fb.c
View file

@ -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);
@ -826,12 +868,25 @@ 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);