openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

video imxfb: do not depend on grouped clocks 

the current i.MX clock support groups together unrelated clocks
to a single clock which is then used by the driver. This can't
be accomplished with the generic clock framework so we instead
request the individual clocks in the driver. For i.MX there are
generally three different clocks:

ipg: bus clock (needed to access registers)
ahb: dma relevant clock, sometimes referred to as hclk in the datasheet
per: bit clock, pixel clock

This patch changes the driver to request the individual clocks.
Currently all clk_get will get the same clock until the SoCs
are converted to the generic clock framework

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2012-03-07 09:30:36 +01:00
parent aa29d840e3
commit 13aaea03b9
1 changed files with 35 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
drivers/video/imxfb.c
View File

@ -131,7 +131,9 @@ struct imxfb_rgb {
struct imxfb_info {
struct platform_device *pdev;
void __iomem *regs;
struct clk *clk;
struct clk *clk_ipg;
struct clk *clk_ahb;
struct clk *clk_per;
/*
* These are the addresses we mapped
@ -340,7 +342,7 @@ static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
lcd_clk = clk_get_rate(fbi->clk);
lcd_clk = clk_get_rate(fbi->clk_per);
tmp = var->pixclock * (unsigned long long)lcd_clk;
@ -455,11 +457,17 @@ static int imxfb_bl_update_status(struct backlight_device *bl)
fbi->pwmr = (fbi->pwmr & ~0xFF) | brightness;
if (bl->props.fb_blank != FB_BLANK_UNBLANK)
clk_enable(fbi->clk);
if (bl->props.fb_blank != FB_BLANK_UNBLANK) {
clk_prepare_enable(fbi->clk_ipg);
clk_prepare_enable(fbi->clk_ahb);
clk_prepare_enable(fbi->clk_per);
}
writel(fbi->pwmr, fbi->regs + LCDC_PWMR);
if (bl->props.fb_blank != FB_BLANK_UNBLANK)
clk_disable(fbi->clk);
if (bl->props.fb_blank != FB_BLANK_UNBLANK) {
clk_disable_unprepare(fbi->clk_per);
clk_disable_unprepare(fbi->clk_ahb);
clk_disable_unprepare(fbi->clk_ipg);
}
return 0;
}
@ -522,7 +530,9 @@ static void imxfb_enable_controller(struct imxfb_info *fbi)
*/
writel(RMCR_LCDC_EN_MX1, fbi->regs + LCDC_RMCR);
clk_enable(fbi->clk);
clk_prepare_enable(fbi->clk_ipg);
clk_prepare_enable(fbi->clk_ahb);
clk_prepare_enable(fbi->clk_per);
if (fbi->backlight_power)
fbi->backlight_power(1);
@ -539,7 +549,9 @@ static void imxfb_disable_controller(struct imxfb_info *fbi)
if (fbi->lcd_power)
fbi->lcd_power(0);
clk_disable(fbi->clk);
clk_disable_unprepare(fbi->clk_per);
clk_disable_unprepare(fbi->clk_ipg);
clk_disable_unprepare(fbi->clk_ahb);
writel(0, fbi->regs + LCDC_RMCR);
}
@ -770,10 +782,21 @@ static int __init imxfb_probe(struct platform_device *pdev)
goto failed_req;
}
fbi->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(fbi->clk)) {
ret = PTR_ERR(fbi->clk);
dev_err(&pdev->dev, "unable to get clock: %d\n", ret);
fbi->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
if (IS_ERR(fbi->clk_ipg)) {
ret = PTR_ERR(fbi->clk_ipg);
goto failed_getclock;
}
fbi->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
if (IS_ERR(fbi->clk_ahb)) {
ret = PTR_ERR(fbi->clk_ahb);
goto failed_getclock;
}
fbi->clk_per = devm_clk_get(&pdev->dev, "per");
if (IS_ERR(fbi->clk_per)) {
ret = PTR_ERR(fbi->clk_per);
goto failed_getclock;
}
@ -858,7 +881,6 @@ static int __init imxfb_probe(struct platform_device *pdev)
failed_map:
iounmap(fbi->regs);
failed_ioremap:
clk_put(fbi->clk);
failed_getclock:
release_mem_region(res->start, resource_size(res));
failed_req:
@ -895,8 +917,6 @@ static int __devexit imxfb_remove(struct platform_device *pdev)
iounmap(fbi->regs);
release_mem_region(res->start, resource_size(res));
clk_disable(fbi->clk);
clk_put(fbi->clk);
platform_set_drvdata(pdev, NULL);