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s3c-fb: add support for runtime pm

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This patch adds support for runtime pm using the functions.
 - pm_runtime_get_sync()
 - pm_runtime_put_sync()

pm_runtime_get_sync() and pm_runtime_put_sync() are called when
open or release function of framebufer driver is called to inform
the system if hardware is idle or not.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Jingoo Han 2010-12-17 16:45:46 +09:00 committed by Paul Mundt
parent 3b80ffdef0
commit 4959212c18
1 changed files with 107 additions and 4 deletions
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111
drivers/video/s3c-fb.c
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@ -23,6 +23,7 @@
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/interrupt.h>
#include <linux/pm_runtime.h>
#include <mach/map.h>
#include <plat/regs-fb-v4.h>
@ -1013,8 +1014,30 @@ static int s3c_fb_ioctl(struct fb_info *info, unsigned int cmd,
return ret;
}
static int s3c_fb_open(struct fb_info *info, int user)
{
struct s3c_fb_win *win = info->par;
struct s3c_fb *sfb = win->parent;
pm_runtime_get_sync(sfb->dev);
return 0;
}
static int s3c_fb_release(struct fb_info *info, int user)
{
struct s3c_fb_win *win = info->par;
struct s3c_fb *sfb = win->parent;
pm_runtime_put_sync(sfb->dev);
return 0;
}
static struct fb_ops s3c_fb_ops = {
.owner = THIS_MODULE,
.fb_open = s3c_fb_open,
.fb_release = s3c_fb_release,
.fb_check_var = s3c_fb_check_var,
.fb_set_par = s3c_fb_set_par,
.fb_blank = s3c_fb_blank,
@ -1322,6 +1345,8 @@ static int __devinit s3c_fb_probe(struct platform_device *pdev)
clk_enable(sfb->bus_clk);
pm_runtime_enable(sfb->dev);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(dev, "failed to find registers\n");
@ -1360,6 +1385,9 @@ static int __devinit s3c_fb_probe(struct platform_device *pdev)
dev_dbg(dev, "got resources (regs %p), probing windows\n", sfb->regs);
platform_set_drvdata(pdev, sfb);
pm_runtime_get_sync(sfb->dev);
/* setup gpio and output polarity controls */
pd->setup_gpio();
@ -1400,6 +1428,7 @@ static int __devinit s3c_fb_probe(struct platform_device *pdev)
}
platform_set_drvdata(pdev, sfb);
pm_runtime_put_sync(sfb->dev);
return 0;
@ -1434,6 +1463,8 @@ static int __devexit s3c_fb_remove(struct platform_device *pdev)
struct s3c_fb *sfb = platform_get_drvdata(pdev);
int win;
pm_runtime_get_sync(sfb->dev);
for (win = 0; win < S3C_FB_MAX_WIN; win++)
if (sfb->windows[win])
s3c_fb_release_win(sfb, sfb->windows[win]);
@ -1450,12 +1481,16 @@ static int __devexit s3c_fb_remove(struct platform_device *pdev)
kfree(sfb);
pm_runtime_put_sync(sfb->dev);
pm_runtime_disable(sfb->dev);
return 0;
}
#ifdef CONFIG_PM
static int s3c_fb_suspend(struct platform_device *pdev, pm_message_t state)
static int s3c_fb_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct s3c_fb *sfb = platform_get_drvdata(pdev);
struct s3c_fb_win *win;
int win_no;
@ -1473,8 +1508,9 @@ static int s3c_fb_suspend(struct platform_device *pdev, pm_message_t state)
return 0;
}
static int s3c_fb_resume(struct platform_device *pdev)
static int s3c_fb_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct s3c_fb *sfb = platform_get_drvdata(pdev);
struct s3c_fb_platdata *pd = sfb->pdata;
struct s3c_fb_win *win;
@ -1509,9 +1545,70 @@ static int s3c_fb_resume(struct platform_device *pdev)
return 0;
}
int s3c_fb_runtime_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct s3c_fb *sfb = platform_get_drvdata(pdev);
struct s3c_fb_win *win;
int win_no;
for (win_no = S3C_FB_MAX_WIN - 1; win_no >= 0; win_no--) {
win = sfb->windows[win_no];
if (!win)
continue;
/* use the blank function to push into power-down */
s3c_fb_blank(FB_BLANK_POWERDOWN, win->fbinfo);
}
clk_disable(sfb->bus_clk);
return 0;
}
int s3c_fb_runtime_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct s3c_fb *sfb = platform_get_drvdata(pdev);
struct s3c_fb_platdata *pd = sfb->pdata;
struct s3c_fb_win *win;
int win_no;
clk_enable(sfb->bus_clk);
/* setup registers */
writel(pd->vidcon1, sfb->regs + VIDCON1);
/* zero all windows before we do anything */
for (win_no = 0; win_no < sfb->variant.nr_windows; win_no++)
s3c_fb_clear_win(sfb, win_no);
for (win_no = 0; win_no < sfb->variant.nr_windows - 1; win_no++) {
void __iomem *regs = sfb->regs + sfb->variant.keycon;
regs += (win_no * 8);
writel(0xffffff, regs + WKEYCON0);
writel(0xffffff, regs + WKEYCON1);
}
/* restore framebuffers */
for (win_no = 0; win_no < S3C_FB_MAX_WIN; win_no++) {
win = sfb->windows[win_no];
if (!win)
continue;
dev_dbg(&pdev->dev, "resuming window %d\n", win_no);
s3c_fb_set_par(win->fbinfo);
}
return 0;
}
#else
#define s3c_fb_suspend NULL
#define s3c_fb_resume NULL
#define s3c_fb_runtime_suspend NULL
#define s3c_fb_runtime_resume NULL
#endif
@ -1710,15 +1807,21 @@ static struct platform_device_id s3c_fb_driver_ids[] = {
};
MODULE_DEVICE_TABLE(platform, s3c_fb_driver_ids);
static const struct dev_pm_ops s3cfb_pm_ops = {
.suspend = s3c_fb_suspend,
.resume = s3c_fb_resume,
.runtime_suspend = s3c_fb_runtime_suspend,
.runtime_resume = s3c_fb_runtime_resume,
};
static struct platform_driver s3c_fb_driver = {
.probe = s3c_fb_probe,
.remove = __devexit_p(s3c_fb_remove),
.suspend = s3c_fb_suspend,
.resume = s3c_fb_resume,
.id_table = s3c_fb_driver_ids,
.driver = {
.name = "s3c-fb",
.owner = THIS_MODULE,
.pm = &s3cfb_pm_ops,
},
};