s3c6410 休眠与唤醒笔记

矫情吗；* 2022-08-05 00:55 230阅读 0赞

1.s3c6410无法进入休眠

执行echo mem > /sys/power/state后系统无法进行休眠 跟踪发生pm相关函数没有注册 修改arch/arm/plat-samsung/pm.c在最后加上

arch_initcall(s3c_pm_init);//modify by hclydao 20150406

初始化　同时修改如下两个变量

unsigned long s3c_irqwake_intmask	= 0xffff0fffL;//eint0-3 can resume
    unsigned long s3c_irqwake_eintmask	= 0x0L;

设置唤醒中断　这样休眠后就可以通过设置的中断唤醒

2.s3c6410休眠与唤醒之rtc

休眠后rtc会打印一个BUG信息　修改如下drivers/rtc/rtc-s3c.c

增加

static bool wake_en;//add by hclydao 20150522

修改suspend和resume函数

static int s3c_rtc_suspend(struct platform_device *pdev, pm_message_t state)
    {
    	/* save TICNT for anyone using periodic interrupts */
    	ticnt_save = readb(s3c_rtc_base + S3C2410_TICNT);
    	if (s3c_rtc_cpu_type == TYPE_S3C64XX) {
    		ticnt_en_save = readw(s3c_rtc_base + S3C2410_RTCCON);
    		ticnt_en_save &= S3C64XX_RTCCON_TICEN;
    	}
    	s3c_rtc_enable(pdev, 0);
    #if 0 //modify by hclydao 20150507
    	if (device_may_wakeup(&pdev->dev))
    		enable_irq_wake(s3c_rtc_alarmno);
    #else
    	if (device_may_wakeup(&pdev->dev) && !wake_en)
    		if(enable_irq_wake(s3c_rtc_alarmno) == 0)
    			wake_en = true;
    		else
    			dev_err(&pdev->dev,"enable_irq_wake failed\n");
    #endif
    	return 0;
    }
    
    static int s3c_rtc_resume(struct platform_device *pdev)
    {
    	unsigned int tmp;
    	s3c_rtc_enable(pdev, 1);
    	writeb(ticnt_save, s3c_rtc_base + S3C2410_TICNT);
    	if (s3c_rtc_cpu_type == TYPE_S3C64XX && ticnt_en_save) {
    		tmp = readw(s3c_rtc_base + S3C2410_RTCCON);
    		writew(tmp | ticnt_en_save, s3c_rtc_base + S3C2410_RTCCON);
    	}
    #if 0 //modify by hclydao 20150507
    	if (device_may_wakeup(&pdev->dev))
    		disable_irq_wake(s3c_rtc_alarmno);
    #else
    	if (device_may_wakeup(&pdev->dev) && wake_en) {
    		disable_irq_wake(s3c_rtc_alarmno);
    		wake_en = false;
    	}
    #endif
    	return 0;
    }

不通过rtc唤醒

3.s3c6410 休眠与唤醒之lcd

echo mem > /sys/power/state休眠后　唤醒　lcd显示为白屏　修改如下

drivers/video/samsung/s3cfb\_fimd4x.c中的s3cfb\_set\_gpio函数在最前面修改如下本身也有说明　这个寄存器要设置成0

#if	1
    	/* See mach-smdk6410.c:smdk6410_map_io() - S3C64XX_MODEM_MIFPCON */
    	/* Must be '0' for Normal-path instead of By-pass */
    	//writel(0x0, S3C_HOSTIFB_MIFPCON);
    	val = __raw_readl(S3C64XX_MODEM_MIFPCON); //add by hclydao 20150526
    	val &= ~MIFPCON_LCD_BYPASS;
    	__raw_writel(val, S3C64XX_MODEM_MIFPCON);
    #endif

这里修改后　白屏问题解决　但是唤醒后是黑屏　要点击一下屏幕才会有界面显示出来　同时有一些区域还是显示的是黑色

跟踪发现里面执行fbcon\_switch lcd休眠的时候切换了控制台　导致fb数据被清空　去现虚拟控制台后发现lcd完全没显示　所以接到源头

kernel/power/suspend.c 中suspend\_prepare函数调用了pm\_prepare\_console以及pm\_restore\_console把这两个注释掉　解决问题

4.s3c6410 休眠与唤醒之nandflash

休眠唤醒后　往flash里写数据 重新开机后发现数据没有保存　跟踪到代码drivers/mtd/nand/s3c\_nand.c

里面有suspend和resume函数　加入打印flash寄存器代码　发现两次打印的flash寄存器值不一样　修改如下

#include <plat/pm.h> //add by hclydao 20150528
    static int nand_regs[] = {//add by hclydao 20150528
    	S3C_NFCONF,
    	S3C_NFCONT,
    	S3C_NFCMMD,
    	S3C_NFADDR,
    };
    
    static long nand_value[ARRAY_SIZE(nand_regs)];//add by hclydao 20150528
    
    static void s3c_nand_pm(int state) {//add by hclydao 20150528
    	int i;
    	if(state) {
    		for(i=0;i<ARRAY_SIZE(nand_regs);i++) {
    			nand_value[i] = readl(s3c_nand.regs + nand_regs[i]);
    		}
    	} else {
    		for(i=0;i<ARRAY_SIZE(nand_regs);i++) {
    			writel(nand_value[i], (s3c_nand.regs + nand_regs[i]));
    		}
    	}
    }
    
    static void print_nand() { //add by hclydao 20150528
    	printk("+++++++%s : nfconf is 0x%x cont is 0x%x cmmd is 0x%x nfaddr is 0x%x\n",__func__,
    		readl(s3c_nand.regs+S3C_NFCONF),readl(s3c_nand.regs+S3C_NFCONT),
    		readl(s3c_nand.regs+S3C_NFCMMD),readl(s3c_nand.regs+S3C_NFADDR));
    }
    
    static int s3c_nand_suspend(struct platform_device *dev, pm_message_t pm)
    {
    	struct s3c_nand *info = platform_get_drvdata(dev);
    	s3c_nand_pm(1); //add by hclydao 20150528
    	//print_nand();
    	//s3c_pm_do_save(s3c_nand_save, ARRAY_SIZE(s3c_nand_save));
    	clk_disable(s3c_nand.clk);
    	return 0;
    }
    
    static int s3c_nand_resume(struct platform_device *dev)
    {
    	struct s3c_nand *info = platform_get_drvdata(dev);
    	//s3c_pm_do_restore(s3c_nand_save, ARRAY_SIZE(s3c_nand_save));
    	s3c_nand_pm(0); //add by hclydao 20150528
    	//print_nand();
    	clk_enable(s3c_nand.clk);
    	return 0;
    }

编译下载　正常　问题解决

5. s3c6410休眠与唤醒之wm8960

最初测试中发现唤醒后无法播放声音，量波型发现　i2s　时钟信号正常　数据信号没有　没有数据发送给wm8960 跟踪发现　唤醒后播放声音dma没有产生中断　偏移地址没有发生变化　导致数据传送失败 　本来想通过sound/soc/samsung/dma.c中的dma\_trigger去实现dmac数据保存与恢复　跟踪发现suspend信号根本都没有发到这里来　跟踪半天　找到了源头　但是无法解决　所以直接在sound/soc/samsung/i2s.c里加了算了　修改如下

#ifdef CONFIG_PM
    #include <asm/hardware/pl080.h>//add by hclydao 20150601
    static int dma_regs[] = { //add by hclydao 20150601
    	PL080_TC_CLEAR,
    	PL080_ERR_CLEAR,
    	PL080_SOFT_BREQ,
    	PL080_SOFT_SREQ,
    	PL080_CONFIG,
    	PL080_SYNC,
    };
    
    static long dma_value0[ARRAY_SIZE(dma_regs)];//add by hclydao 20150601
    static long dma_value1[ARRAY_SIZE(dma_regs)];//add by hclydao 20150601 
    
    void s3c_pm_save_dma(void) {//add by hclydao 20150601
    	void __iomem *regs;
    	int i = 0;
    	regs = ioremap(0x75000000, 0x200);
    	if (!regs) {
    		printk(KERN_ERR "%s: %d failed to ioremap()\n", __func__,__LINE__);
    		return ;
    	}
    	for(i=0;i<ARRAY_SIZE(dma_regs);i++) {
    		dma_value0[i] = readl(regs + dma_regs[i]);
    	}
    	iounmap(regs);
    	
    	regs = ioremap(0x75100000, 0x200);
    	if (!regs) {
    		printk(KERN_ERR "%s: %d failed to ioremap()\n", __func__,__LINE__);
    		return ;
    	}
    	for(i=0;i<ARRAY_SIZE(dma_regs);i++) {
    		dma_value1[i] = readl(regs + dma_regs[i]);
    	}
    
    	iounmap(regs);
    	return;
    }
    
    void s3c_pm_restore_dma(void) {//add by hclydao 20150601
    	void __iomem *regs;
    	int i = 0;
    	regs = ioremap(0x75000000, 0x200);
    	if (!regs) {
    		printk(KERN_ERR "%s: %d failed to ioremap()\n", __func__,__LINE__);
    		return ;
    	}
    	
    	for(i=0;i<ARRAY_SIZE(dma_regs);i++) {
    		writel(dma_value0[i],(regs + dma_regs[i]));
    	}
    	iounmap(regs);
    	
    	regs = ioremap(0x75100000, 0x200);
    	if (!regs) {
    		printk(KERN_ERR "%s: %d failed to ioremap()\n", __func__,__LINE__);
    		return ;
    	}
    	
    	for(i=0;i<ARRAY_SIZE(dma_regs);i++) {
    		writel(dma_value1[i],(regs + dma_regs[i]));
    	}
    
    	iounmap(regs);
    	return;
    }
    static void i2s_printk(struct i2s_dai *i2s) { //add by hclydao 20150528
    	printk("++++I2SMOD is 0x%x I2SCON : 0x%x I2SPSR : 0x%x I2SFIC: 0x%x\n",readl(i2s->addr + I2SMOD),readl(i2s->addr + I2SCON),
    		readl(i2s->addr + I2SPSR),readl(i2s->addr + I2SFIC));
    }
    
    static int i2s_suspend(struct snd_soc_dai *dai)
    {
    	struct i2s_dai *i2s = to_info(dai);
    	s3c_pm_save_dma();//add by hclydao 20150601
    	//if (dai->active) {//modify by hclydao 20150601
    		i2s->suspend_i2smod = readl(i2s->addr + I2SMOD);
    		i2s->suspend_i2scon = readl(i2s->addr + I2SCON);
    		i2s->suspend_i2spsr = readl(i2s->addr + I2SPSR);
    		i2s->suspend_i2sfic = readl(i2s->addr + I2SFIC);
    	//}
    
    	return 0;
    }
    
    static int i2s_resume(struct snd_soc_dai *dai)
    {
    	struct i2s_dai *i2s = to_info(dai);
    	s3c_pm_restore_dma();//add by hclydao 20150601
    	//if (dai->active) {//modify by hclydao 20150601
    		writel(i2s->suspend_i2scon, i2s->addr + I2SCON);
    		writel(i2s->suspend_i2smod, i2s->addr + I2SMOD);
    		writel(i2s->suspend_i2spsr, i2s->addr + I2SPSR);
    		writel(i2s->suspend_i2sfic, i2s->addr + I2SFIC);
    	//}
    	return 0;
    }
    #else
    #define i2s_suspend NULL
    #define i2s_resume  NULL
    #endif

将串口和pcm用的dmac保存再恢复 同时将i2s相关寄存器也作相应处理 还要修改sound/soc/codecs/wm8960.c

static int wm8960_suspend(struct snd_soc_codec *codec, pm_message_t state)
    {
    #if 1 //modify by hclydao youhua 20150601
    	struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
    
    	wm8960->set_bias_level(codec, SND_SOC_BIAS_OFF);
    #endif
    	return 0;
    }
    
    static int wm8960_resume(struct snd_soc_codec *codec)
    {
    
    	struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
    #if 0 //modify by hclydao youhua 20150601
    	int i;
    	u8 data[2];
    	u16 *cache = codec->reg_cache;
    
    	/* Sync reg_cache with the hardware */
    	for (i = 0; i < ARRAY_SIZE(wm8960_reg); i++) {
    		data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
    		data[1] = cache[i] & 0x00ff;
    		codec->hw_write(codec->control_data, data, 2);
    	}
    #else
    	wm8960->set_bias_level(codec, SND_SOC_BIAS_STANDBY);
    #endif
    	return 0;
    }

还有一个系统控制选择dma还是sdma的地方arch/arm/mach-s3c64xx/pm.c在static struct sleep\_save core\_save\[\]最后加上

SAVE_ITEM(S3C_SYSREG(0x110)),//add by hclydao 20150529

编译下载　问题解决

6.s3c6410休眠与唤醒之usb host

唤醒后usb host无法工作　修改如下

drivers/usb/host/ohci-s3c2410.c

#ifdef	CONFIG_PM //add by hclydao 20150522
    static int ohci_hcd_s3c2410_drv_suspend(struct device *dev)
    {
    #ifdef CONFIG_MACH_GZSD6410
    	s3c_otg_phy_config(0);
    #endif
    }
    
    static int ohci_hcd_s3c2410_drv_resume(struct device *dev)
    {
    #ifdef CONFIG_MACH_GZSD6410
    	s3c_otg_phy_config(1);
    #endif
    }
    #endif
    static struct platform_driver ohci_hcd_s3c2410_driver = {
    	.probe		= ohci_hcd_s3c2410_drv_probe,
    	.remove		= ohci_hcd_s3c2410_drv_remove,
    	.shutdown	= usb_hcd_platform_shutdown,
    #if 0 //modify by hclydao 20150522
    	/*.suspend	= ohci_hcd_s3c2410_drv_suspend, */
    	/*.resume	= ohci_hcd_s3c2410_drv_resume, */
    #else
    #ifdef	CONFIG_PM
    	.suspend	= ohci_hcd_s3c2410_drv_suspend,
    	.resume	= ohci_hcd_s3c2410_drv_resume,
    #endif
    #endif
    	.driver		= {
    		.owner	= THIS_MODULE,
    		.name	= "s3c2410-ohci",
    	},
    };