Commit f909ef64 authored by Sascha Hauer's avatar Sascha Hauer
Browse files

imxfb: add clock support 



v2: Added change from Martin Fuzzey: pixclock should be in pico seconds
    instead of MHz.

Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
parent 74bef9a4

drivers/video/imxfb.c

+39 −1
Original line number Diff line number Diff line
@@ -26,9 +26,11 @@ 
#include <linux/init.h>

#include <linux/ioport.h>

#include <linux/cpufreq.h>

#include <linux/clk.h>

#include <linux/platform_device.h>

#include <linux/dma-mapping.h>

#include <linux/io.h>

#include <linux/math64.h>



#include <mach/imxfb.h>
@@ -141,6 +143,7 @@ struct imxfb_rgb { 
struct imxfb_info {

	struct platform_device  *pdev;

	void __iomem		*regs;

	struct clk		*clk;



	u_int			max_bpp;

	u_int			max_xres;
@@ -403,6 +406,8 @@ static void imxfb_enable_controller(struct imxfb_info *fbi) 


	writel(RMCR_LCDC_EN, fbi->regs + LCDC_RMCR);



	clk_enable(fbi->clk);



	if (fbi->backlight_power)

		fbi->backlight_power(1);

	if (fbi->lcd_power)
@@ -418,6 +423,8 @@ static void imxfb_disable_controller(struct imxfb_info *fbi) 
	if (fbi->lcd_power)

		fbi->lcd_power(0);



	clk_disable(fbi->clk);



	writel(0, fbi->regs + LCDC_RMCR);

}
@@ -461,6 +468,9 @@ static struct fb_ops imxfb_ops = { 
static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)

{

	struct imxfb_info *fbi = info->par;

	unsigned int pcr, lcd_clk;

	unsigned long long tmp;



	pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",

		var->xres, var->hsync_len,

		var->left_margin, var->right_margin);
@@ -507,7 +517,23 @@ static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *inf 


	writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres),

			fbi->regs + LCDC_SIZE);

	writel(fbi->pcr, fbi->regs + LCDC_PCR);



	lcd_clk = clk_get_rate(fbi->clk);

	tmp = var->pixclock * (unsigned long long)lcd_clk;

	do_div(tmp, 1000000);

	if (do_div(tmp, 1000000) > 500000)

		tmp++;

	pcr = (unsigned int)tmp;

	if (--pcr > 0x3F) {

		pcr = 0x3F;

		printk(KERN_WARNING "Must limit pixel clock to %uHz\n",

				lcd_clk / pcr);

	}



	/* add sync polarities */

	pcr |= fbi->pcr & ~0x3F;



	writel(pcr, fbi->regs + LCDC_PCR);

	writel(fbi->pwmr, fbi->regs + LCDC_PWMR);

	writel(fbi->lscr1, fbi->regs + LCDC_LSCR1);

	writel(fbi->dmacr, fbi->regs + LCDC_DMACR);
@@ -649,6 +675,13 @@ 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);

		goto failed_getclock;

	}



	fbi->regs = ioremap(res->start, resource_size(res));

	if (fbi->regs == NULL) {

		printk(KERN_ERR"Cannot map frame buffer registers\n");
@@ -717,6 +750,8 @@ static int __init imxfb_probe(struct platform_device *pdev) 
		dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,

			fbi->map_dma);

failed_map:

	clk_put(fbi->clk);

failed_getclock:

	iounmap(fbi->regs);

failed_ioremap:

	release_mem_region(res->start, res->end - res->start);
@@ -751,6 +786,9 @@ static int __devexit imxfb_remove(struct platform_device *pdev) 


	iounmap(fbi->regs);

	release_mem_region(res->start, res->end - res->start + 1);

	clk_disable(fbi->clk);

	clk_put(fbi->clk);



	platform_set_drvdata(pdev, NULL);



	return 0;