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drm/exynos: add runtime pm feature for fimd

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This adds runtime PM feature for fimd. The runtime PM functions control
clocks for fimd and prevent to access the register of fimd for vblank
when clock is turned off by suspend of runtime PM.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
This commit is contained in:
Joonyoung Shim 2011-12-09 16:52:11 +09:00 committed by Inki Dae
parent ec05da959a
commit cb91f6a078
1 changed files with 77 additions and 1 deletions
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78
drivers/gpu/drm/exynos/exynos_drm_fimd.c
View file

@ -17,6 +17,7 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/pm_runtime.h>
#include <drm/exynos_drm.h>
#include <plat/regs-fb-v4.h>
@ -85,6 +86,7 @@ struct fimd_context {
unsigned long irq_flags;
u32 vidcon0;
u32 vidcon1;
bool suspended;
struct fb_videomode *timing;
};
@ -137,7 +139,19 @@ static void fimd_dpms(struct device *subdrv_dev, int mode)
{
DRM_DEBUG_KMS("%s, %d\n", __FILE__, mode);
/* TODO */
switch (mode) {
case DRM_MODE_DPMS_ON:
pm_runtime_get_sync(subdrv_dev);
break;
case DRM_MODE_DPMS_STANDBY:
case DRM_MODE_DPMS_SUSPEND:
case DRM_MODE_DPMS_OFF:
pm_runtime_put_sync(subdrv_dev);
break;
default:
DRM_DEBUG_KMS("unspecified mode %d\n", mode);
break;
}
}
static void fimd_apply(struct device *subdrv_dev)
@ -210,6 +224,9 @@ static int fimd_enable_vblank(struct device *dev)
DRM_DEBUG_KMS("%s\n", __FILE__);
if (ctx->suspended)
return -EPERM;
if (!test_and_set_bit(0, &ctx->irq_flags)) {
val = readl(ctx->regs + VIDINTCON0);
@ -234,6 +251,9 @@ static void fimd_disable_vblank(struct device *dev)
DRM_DEBUG_KMS("%s\n", __FILE__);
if (ctx->suspended)
return;
if (test_and_clear_bit(0, &ctx->irq_flags)) {
val = readl(ctx->regs + VIDINTCON0);
@ -760,6 +780,10 @@ static int __devinit fimd_probe(struct platform_device *pdev)
goto err_req_irq;
}
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
for (win = 0; win < WINDOWS_NR; win++)
fimd_clear_win(ctx, win);
@ -812,14 +836,25 @@ static int __devinit fimd_probe(struct platform_device *pdev)
static int __devexit fimd_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct fimd_context *ctx = platform_get_drvdata(pdev);
DRM_DEBUG_KMS("%s\n", __FILE__);
exynos_drm_subdrv_unregister(&ctx->subdrv);
if (ctx->suspended)
goto out;
clk_disable(ctx->lcd_clk);
clk_disable(ctx->bus_clk);
pm_runtime_set_suspended(dev);
pm_runtime_put_sync(dev);
out:
pm_runtime_disable(dev);
clk_put(ctx->lcd_clk);
clk_put(ctx->bus_clk);
@ -833,12 +868,53 @@ static int __devexit fimd_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM_RUNTIME
static int fimd_runtime_suspend(struct device *dev)
{
struct fimd_context *ctx = get_fimd_context(dev);
DRM_DEBUG_KMS("%s\n", __FILE__);
clk_disable(ctx->lcd_clk);
clk_disable(ctx->bus_clk);
ctx->suspended = true;
return 0;
}
static int fimd_runtime_resume(struct device *dev)
{
struct fimd_context *ctx = get_fimd_context(dev);
int ret;
DRM_DEBUG_KMS("%s\n", __FILE__);
ret = clk_enable(ctx->bus_clk);
if (ret < 0)
return ret;
ret = clk_enable(ctx->lcd_clk);
if (ret < 0) {
clk_disable(ctx->bus_clk);
return ret;
}
ctx->suspended = false;
return 0;
}
#endif
static const struct dev_pm_ops fimd_pm_ops = {
SET_RUNTIME_PM_OPS(fimd_runtime_suspend, fimd_runtime_resume, NULL)
};
static struct platform_driver fimd_driver = {
.probe = fimd_probe,
.remove = __devexit_p(fimd_remove),
.driver = {
.name = "exynos4-fb",
.owner = THIS_MODULE,
.pm = &fimd_pm_ops,
},
};