[PATCH v2 1/2] davinci: MMC: Add a function to control reset state of the controller

[PATCH v2 1/2] davinci: MMC: Add a function to control reset state of the controller

[Chaithrika U S]

Add a helper function which will aid in changing the reset
status of the controller.

Signed-off-by: Chaithrika U S <chaithrika@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
---
Applies to Linus' kernel tree

 drivers/mmc/host/davinci_mmc.c |   37 ++++++++++++++++---------------------
 1 files changed, 16 insertions(+), 21 deletions(-)

diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
index dd45e7c..25645bf 100644
--- a/drivers/mmc/host/davinci_mmc.c
+++ b/drivers/mmc/host/davinci_mmc.c
@@ -884,19 +884,26 @@ static void mmc_davinci_cmd_done(struct mmc_davinci_host *host,
 	}
 }
 
-static void
-davinci_abort_data(struct mmc_davinci_host *host, struct mmc_data *data)
+static inline void mmc_davinci_reset_ctrl(struct mmc_davinci_host *host,
+								int val)
 {
 	u32 temp;
 
-	/* reset command and data state machines */
 	temp = readl(host->base + DAVINCI_MMCCTL);
-	writel(temp | MMCCTL_CMDRST | MMCCTL_DATRST,
-		host->base + DAVINCI_MMCCTL);
+	if (val)	/* reset */
+		temp |= MMCCTL_CMDRST | MMCCTL_DATRST;
+	else		/* enable */
+		temp &= ~(MMCCTL_CMDRST | MMCCTL_DATRST);
 
-	temp &= ~(MMCCTL_CMDRST | MMCCTL_DATRST);
-	udelay(10);
 	writel(temp, host->base + DAVINCI_MMCCTL);
+	udelay(10);
+}
+
+static void
+davinci_abort_data(struct mmc_davinci_host *host, struct mmc_data *data)
+{
+	mmc_davinci_reset_ctrl(host, 1);
+	mmc_davinci_reset_ctrl(host, 0);
 }
 
 static irqreturn_t mmc_davinci_irq(int irq, void *dev_id)
@@ -1100,15 +1107,8 @@ static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host)
 #endif
 static void __init init_mmcsd_host(struct mmc_davinci_host *host)
 {
-	/* DAT line portion is diabled and in reset state */
-	writel(readl(host->base + DAVINCI_MMCCTL) | MMCCTL_DATRST,
-		host->base + DAVINCI_MMCCTL);
-
-	/* CMD line portion is diabled and in reset state */
-	writel(readl(host->base + DAVINCI_MMCCTL) | MMCCTL_CMDRST,
-		host->base + DAVINCI_MMCCTL);
 
-	udelay(10);
+	mmc_davinci_reset_ctrl(host, 1);
 
 	writel(0, host->base + DAVINCI_MMCCLK);
 	writel(MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
@@ -1116,12 +1116,7 @@ static void __init init_mmcsd_host(struct mmc_davinci_host *host)
 	writel(0x1FFF, host->base + DAVINCI_MMCTOR);
 	writel(0xFFFF, host->base + DAVINCI_MMCTOD);
 
-	writel(readl(host->base + DAVINCI_MMCCTL) & ~MMCCTL_DATRST,
-		host->base + DAVINCI_MMCCTL);
-	writel(readl(host->base + DAVINCI_MMCCTL) & ~MMCCTL_CMDRST,
-		host->base + DAVINCI_MMCCTL);
-
-	udelay(10);
+	mmc_davinci_reset_ctrl(host, 0);
 }
 
 static int __init davinci_mmcsd_probe(struct platform_device *pdev)
-- 
1.5.6

[PATCH v2 2/2] davinci: MMC: updates to suspend/resume implementation

[Chaithrika U S]

Improve the suspend and resume callbacks in DaVinci MMC
host controller driver.

Tested on DA850/OMAP-L138 EVM. This testing requires patches
which add suspen-to-RAM support to DA850/OMAP-L138 SoC[1].

[1]http://linux.davincidsp.com/pipermail/davinci-linux-open-source/
2009-September/016118.html

Signed-off-by: Chaithrika U S <chaithrika@ti.com>
---
Applies to Linus' kernel tree.

 drivers/mmc/host/davinci_mmc.c |   51 +++++++++++++++++++++++++++++++++------
 1 files changed, 43 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
index 25645bf..d60f648 100644
--- a/drivers/mmc/host/davinci_mmc.c
+++ b/drivers/mmc/host/davinci_mmc.c
@@ -170,6 +170,7 @@ struct mmc_davinci_host {
 #define DAVINCI_MMC_DATADIR_READ	1
 #define DAVINCI_MMC_DATADIR_WRITE	2
 	unsigned char data_dir;
+	unsigned char suspended;
 
 	/* buffer is used during PIO of one scatterlist segment, and
 	 * is updated along with buffer_bytes_left.  bytes_left applies
@@ -1297,32 +1298,66 @@ static int __exit davinci_mmcsd_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_PM
-static int davinci_mmcsd_suspend(struct platform_device *pdev, pm_message_t msg)
+static int davinci_mmcsd_suspend(struct device *dev)
 {
+	struct platform_device *pdev = to_platform_device(dev);
 	struct mmc_davinci_host *host = platform_get_drvdata(pdev);
+	struct pm_message msg = { PM_EVENT_SUSPEND };
+	int ret;
 
-	return mmc_suspend_host(host->mmc, msg);
+	mmc_host_enable(host->mmc);
+	ret = mmc_suspend_host(host->mmc, msg);
+	if (!ret) {
+		writel(0, host->base + DAVINCI_MMCIM);
+		mmc_davinci_reset_ctrl(host, 1);
+		mmc_host_disable(host->mmc);
+		clk_disable(host->clk);
+		host->suspended = 1;
+	} else {
+		host->suspended = 0;
+		mmc_host_disable(host->mmc);
+	}
+
+	return ret;
 }
 
-static int davinci_mmcsd_resume(struct platform_device *pdev)
+static int davinci_mmcsd_resume(struct device *dev)
 {
+	struct platform_device *pdev = to_platform_device(dev);
 	struct mmc_davinci_host *host = platform_get_drvdata(pdev);
+	int ret;
 
-	return mmc_resume_host(host->mmc);
+	if (!host->suspended)
+		return 0;
+
+	clk_enable(host->clk);
+	mmc_host_enable(host->mmc);
+
+	mmc_davinci_reset_ctrl(host, 0);
+	ret = mmc_resume_host(host->mmc);
+	if (!ret)
+		host->suspended = 0;
+
+	return ret;
 }
+
+static struct dev_pm_ops davinci_mmcsd_pm = {
+	.suspend        = davinci_mmcsd_suspend,
+	.resume         = davinci_mmcsd_resume,
+};
+
+#define davinci_mmcsd_pm_ops (&davinci_mmcsd_pm)
 #else
-#define davinci_mmcsd_suspend	NULL
-#define davinci_mmcsd_resume	NULL
+#define davinci_mmcsd_pm_ops NULL
 #endif
 
 static struct platform_driver davinci_mmcsd_driver = {
 	.driver		= {
 		.name	= "davinci_mmc",
 		.owner	= THIS_MODULE,
+		.pm	= davinci_mmcsd_pm_ops,
 	},
 	.remove		= __exit_p(davinci_mmcsd_remove),
-	.suspend	= davinci_mmcsd_suspend,
-	.resume		= davinci_mmcsd_resume,
 };
 
 static int __init davinci_mmcsd_init(void)
-- 
1.5.6

Re: [PATCH v2 1/2] davinci: MMC: Add a function to control reset state of the controller

[Kevin Hilman]

Chaithrika U S <chaithrika@ti.com> writes:

> Add a helper function which will aid in changing the reset
> status of the controller.
>
> Signed-off-by: Chaithrika U S <chaithrika@ti.com>
> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

my s-o-b should actually be:

Acked-by: Kevin Hilman <khilman@deeprootsystems.com>

> ---
> Applies to Linus' kernel tree
>
>  drivers/mmc/host/davinci_mmc.c |   37 ++++++++++++++++---------------------
>  1 files changed, 16 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
> index dd45e7c..25645bf 100644
> --- a/drivers/mmc/host/davinci_mmc.c
> +++ b/drivers/mmc/host/davinci_mmc.c
> @@ -884,19 +884,26 @@ static void mmc_davinci_cmd_done(struct mmc_davinci_host *host,
>  	}
>  }
>  
> -static void
> -davinci_abort_data(struct mmc_davinci_host *host, struct mmc_data *data)
> +static inline void mmc_davinci_reset_ctrl(struct mmc_davinci_host *host,
> +								int val)
>  {
>  	u32 temp;
>  
> -	/* reset command and data state machines */
>  	temp = readl(host->base + DAVINCI_MMCCTL);
> -	writel(temp | MMCCTL_CMDRST | MMCCTL_DATRST,
> -		host->base + DAVINCI_MMCCTL);
> +	if (val)	/* reset */
> +		temp |= MMCCTL_CMDRST | MMCCTL_DATRST;
> +	else		/* enable */
> +		temp &= ~(MMCCTL_CMDRST | MMCCTL_DATRST);
>  
> -	temp &= ~(MMCCTL_CMDRST | MMCCTL_DATRST);
> -	udelay(10);
>  	writel(temp, host->base + DAVINCI_MMCCTL);
> +	udelay(10);
> +}
> +
> +static void
> +davinci_abort_data(struct mmc_davinci_host *host, struct mmc_data *data)
> +{
> +	mmc_davinci_reset_ctrl(host, 1);
> +	mmc_davinci_reset_ctrl(host, 0);
>  }
>  
>  static irqreturn_t mmc_davinci_irq(int irq, void *dev_id)
> @@ -1100,15 +1107,8 @@ static inline void mmc_davinci_cpufreq_deregister(struct mmc_davinci_host *host)
>  #endif
>  static void __init init_mmcsd_host(struct mmc_davinci_host *host)
>  {
> -	/* DAT line portion is diabled and in reset state */
> -	writel(readl(host->base + DAVINCI_MMCCTL) | MMCCTL_DATRST,
> -		host->base + DAVINCI_MMCCTL);
> -
> -	/* CMD line portion is diabled and in reset state */
> -	writel(readl(host->base + DAVINCI_MMCCTL) | MMCCTL_CMDRST,
> -		host->base + DAVINCI_MMCCTL);
>  
> -	udelay(10);
> +	mmc_davinci_reset_ctrl(host, 1);
>  
>  	writel(0, host->base + DAVINCI_MMCCLK);
>  	writel(MMCCLK_CLKEN, host->base + DAVINCI_MMCCLK);
> @@ -1116,12 +1116,7 @@ static void __init init_mmcsd_host(struct mmc_davinci_host *host)
>  	writel(0x1FFF, host->base + DAVINCI_MMCTOR);
>  	writel(0xFFFF, host->base + DAVINCI_MMCTOD);
>  
> -	writel(readl(host->base + DAVINCI_MMCCTL) & ~MMCCTL_DATRST,
> -		host->base + DAVINCI_MMCCTL);
> -	writel(readl(host->base + DAVINCI_MMCCTL) & ~MMCCTL_CMDRST,
> -		host->base + DAVINCI_MMCCTL);
> -
> -	udelay(10);
> +	mmc_davinci_reset_ctrl(host, 0);
>  }
>  
>  static int __init davinci_mmcsd_probe(struct platform_device *pdev)
> -- 
> 1.5.6

Re: [PATCH v2 2/2] davinci: MMC: updates to suspend/resume implementation

[Kevin Hilman]

Chaithrika U S <chaithrika@ti.com> writes:

> Improve the suspend and resume callbacks in DaVinci MMC
> host controller driver.

I think this changelog needs a bit more detail on what "improve" means.

Also, you should add a comment about the conversion to dev_pm_ops.

Kevin

> Tested on DA850/OMAP-L138 EVM. This testing requires patches
> which add suspen-to-RAM support to DA850/OMAP-L138 SoC[1].
>
> [1]http://linux.davincidsp.com/pipermail/davinci-linux-open-source/
> 2009-September/016118.html
>
> Signed-off-by: Chaithrika U S <chaithrika@ti.com>
> ---
> Applies to Linus' kernel tree.
>
>  drivers/mmc/host/davinci_mmc.c |   51 +++++++++++++++++++++++++++++++++------
>  1 files changed, 43 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
> index 25645bf..d60f648 100644
> --- a/drivers/mmc/host/davinci_mmc.c
> +++ b/drivers/mmc/host/davinci_mmc.c
> @@ -170,6 +170,7 @@ struct mmc_davinci_host {
>  #define DAVINCI_MMC_DATADIR_READ	1
>  #define DAVINCI_MMC_DATADIR_WRITE	2
>  	unsigned char data_dir;
> +	unsigned char suspended;
>  
>  	/* buffer is used during PIO of one scatterlist segment, and
>  	 * is updated along with buffer_bytes_left.  bytes_left applies
> @@ -1297,32 +1298,66 @@ static int __exit davinci_mmcsd_remove(struct platform_device *pdev)
>  }
>  
>  #ifdef CONFIG_PM
> -static int davinci_mmcsd_suspend(struct platform_device *pdev, pm_message_t msg)
> +static int davinci_mmcsd_suspend(struct device *dev)
>  {
> +	struct platform_device *pdev = to_platform_device(dev);
>  	struct mmc_davinci_host *host = platform_get_drvdata(pdev);
> +	struct pm_message msg = { PM_EVENT_SUSPEND };
> +	int ret;
>  
> -	return mmc_suspend_host(host->mmc, msg);
> +	mmc_host_enable(host->mmc);
> +	ret = mmc_suspend_host(host->mmc, msg);
> +	if (!ret) {
> +		writel(0, host->base + DAVINCI_MMCIM);
> +		mmc_davinci_reset_ctrl(host, 1);
> +		mmc_host_disable(host->mmc);
> +		clk_disable(host->clk);
> +		host->suspended = 1;
> +	} else {
> +		host->suspended = 0;
> +		mmc_host_disable(host->mmc);
> +	}
> +
> +	return ret;
>  }
>  
> -static int davinci_mmcsd_resume(struct platform_device *pdev)
> +static int davinci_mmcsd_resume(struct device *dev)
>  {
> +	struct platform_device *pdev = to_platform_device(dev);
>  	struct mmc_davinci_host *host = platform_get_drvdata(pdev);
> +	int ret;
>  
> -	return mmc_resume_host(host->mmc);
> +	if (!host->suspended)
> +		return 0;
> +
> +	clk_enable(host->clk);
> +	mmc_host_enable(host->mmc);
> +
> +	mmc_davinci_reset_ctrl(host, 0);
> +	ret = mmc_resume_host(host->mmc);
> +	if (!ret)
> +		host->suspended = 0;
> +
> +	return ret;
>  }
> +
> +static struct dev_pm_ops davinci_mmcsd_pm = {
> +	.suspend        = davinci_mmcsd_suspend,
> +	.resume         = davinci_mmcsd_resume,
> +};
> +
> +#define davinci_mmcsd_pm_ops (&davinci_mmcsd_pm)
>  #else
> -#define davinci_mmcsd_suspend	NULL
> -#define davinci_mmcsd_resume	NULL
> +#define davinci_mmcsd_pm_ops NULL
>  #endif
>  
>  static struct platform_driver davinci_mmcsd_driver = {
>  	.driver		= {
>  		.name	= "davinci_mmc",
>  		.owner	= THIS_MODULE,
> +		.pm	= davinci_mmcsd_pm_ops,
>  	},
>  	.remove		= __exit_p(davinci_mmcsd_remove),
> -	.suspend	= davinci_mmcsd_suspend,
> -	.resume		= davinci_mmcsd_resume,
>  };
>  
>  static int __init davinci_mmcsd_init(void)
> -- 
> 1.5.6