Re: [PATCH v3 1/4] mmc: sdhci-cadence: add suspend / resume support

[Masahiro Yamada]

Hi Adrian,


2017-08-21 20:48 GMT+09:00 Adrian Hunter :

>> +static int sdhci_cdns_resume(struct device *dev)
>> +{
>> + struct sdhci_host *host = dev_get_drvdata(dev);
>> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>> + struct sdhci_cdns_priv *priv = sdhci_pltfm_priv(pltfm_host);
>> + int ret;
>> +
>> + ret = clk_prepare_enable(pltfm_host->clk);
>> + if (ret)
>> + return ret;
>> +
>> + ret = sdhci_cdns_phy_init(priv);
>> + if (ret)
>> + return ret;
>
> Perhaps clk_disable_unprepare(pltfm_host->clk)
>
>> +
>> + return sdhci_resume_host(host);
>
> Ditto on error.

Thanks.

Maybe 3/4 should be fixed as well.




-- 
Best Regards
Masahiro Yamada

Re: [PATCH v3 1/4] mmc: sdhci-cadence: add suspend / resume support

[Masahiro Yamada]

Hi Adrian,


2017-08-21 20:48 GMT+09:00 Adrian Hunter :

>> +static int sdhci_cdns_resume(struct device *dev)
>> +{
>> + struct sdhci_host *host = dev_get_drvdata(dev);
>> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>> + struct sdhci_cdns_priv *priv = sdhci_pltfm_priv(pltfm_host);
>> + int ret;
>> +
>> + ret = clk_prepare_enable(pltfm_host->clk);
>> + if (ret)
>> + return ret;
>> +
>> + ret = sdhci_cdns_phy_init(priv);
>> + if (ret)
>> + return ret;
>
> Perhaps clk_disable_unprepare(pltfm_host->clk)
>
>> +
>> + return sdhci_resume_host(host);
>
> Ditto on error.

Thanks.

Maybe 3/4 should be fixed as well.




-- 
Best Regards
Masahiro Yamada

Re: [PATCH v3 1/4] mmc: sdhci-cadence: add suspend / resume support

[Adrian Hunter]

On 15/08/17 18:45, Masahiro Yamada wrote:
> Currently, the probe function initializes the PHY, but PHY settings
> are lost during the sleep state.  Restore the PHY registers when
> resuming.
> 
> To facilitate this, split sdhci_cdns_phy_init() into the DT parse
> part and PHY update part so that the latter can be invoked from the
> resume hook.
> 
> Signed-off-by: Masahiro Yamada 

Just one comment about using clk_disable_unprepare() on the error path.

> ---
> 
> Changes in v3:
>  - Use #ifdef CONFIG_PM_SLEEP instead of __maybe_unused
>  - Add own sdhci_cdns_suspend implementation to not depend on
>the core change
> 
> Changes in v2: None
> 
>  drivers/mmc/host/sdhci-cadence.c | 97 
> 
>  1 file changed, 88 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-cadence.c 
> b/drivers/mmc/host/sdhci-cadence.c
> index 19d5698244b5..751ba706bf03 100644
> --- a/drivers/mmc/host/sdhci-cadence.c
> +++ b/drivers/mmc/host/sdhci-cadence.c
> @@ -67,9 +67,16 @@
>   */
>  #define SDHCI_CDNS_MAX_TUNING_LOOP   40
>  
> +struct sdhci_cdns_phy_param {
> + u8 addr;
> + u8 data;
> +};
> +
>  struct sdhci_cdns_priv {
>   void __iomem *hrs_addr;
>   bool enhanced_strobe;
> + unsigned int nr_phy_params;
> + struct sdhci_cdns_phy_param phy_params[0];
>  };
>  
>  struct sdhci_cdns_phy_cfg {
> @@ -115,9 +122,22 @@ static int sdhci_cdns_write_phy_reg(struct 
> sdhci_cdns_priv *priv,
>   return 0;
>  }
>  
> -static int sdhci_cdns_phy_init(struct device_node *np,
> -struct sdhci_cdns_priv *priv)
> +static unsigned int sdhci_cdns_phy_param_count(struct device_node *np)
>  {
> + unsigned int count = 0;
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(sdhci_cdns_phy_cfgs); i++)
> + if (of_property_read_bool(np, sdhci_cdns_phy_cfgs[i].property))
> + count++;
> +
> + return count;
> +}
> +
> +static void sdhci_cdns_phy_param_parse(struct device_node *np,
> +struct sdhci_cdns_priv *priv)
> +{
> + struct sdhci_cdns_phy_param *p = priv->phy_params;
>   u32 val;
>   int ret, i;
>  
> @@ -127,9 +147,19 @@ static int sdhci_cdns_phy_init(struct device_node *np,
>   if (ret)
>   continue;
>  
> - ret = sdhci_cdns_write_phy_reg(priv,
> -sdhci_cdns_phy_cfgs[i].addr,
> -val);
> + p->addr = sdhci_cdns_phy_cfgs[i].addr;
> + p->data = val;
> + p++;
> + }
> +}
> +
> +static int sdhci_cdns_phy_init(struct sdhci_cdns_priv *priv)
> +{
> + int ret, i;
> +
> + for (i = 0; i < priv->nr_phy_params; i++) {
> + ret = sdhci_cdns_write_phy_reg(priv, priv->phy_params[i].addr,
> +priv->phy_params[i].data);
>   if (ret)
>   return ret;
>   }
> @@ -302,6 +332,8 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
>   struct sdhci_pltfm_host *pltfm_host;
>   struct sdhci_cdns_priv *priv;
>   struct clk *clk;
> + size_t priv_size;
> + unsigned int nr_phy_params;
>   int ret;
>   struct device *dev = >dev;
>  
> @@ -313,7 +345,9 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
>   if (ret)
>   return ret;
>  
> - host = sdhci_pltfm_init(pdev, _cdns_pltfm_data, sizeof(*priv));
> + nr_phy_params = sdhci_cdns_phy_param_count(dev->of_node);
> + priv_size = sizeof(*priv) + sizeof(priv->phy_params[0]) * nr_phy_params;
> + host = sdhci_pltfm_init(pdev, _cdns_pltfm_data, priv_size);
>   if (IS_ERR(host)) {
>   ret = PTR_ERR(host);
>   goto disable_clk;
> @@ -322,7 +356,8 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
>   pltfm_host = sdhci_priv(host);
>   pltfm_host->clk = clk;
>  
> - priv = sdhci_cdns_priv(host);
> + priv = sdhci_pltfm_priv(pltfm_host);
> + priv->nr_phy_params = nr_phy_params;
>   priv->hrs_addr = host->ioaddr;
>   priv->enhanced_strobe = false;
>   host->ioaddr += SDHCI_CDNS_SRS_BASE;
> @@ -336,7 +371,9 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
>   if (ret)
>   goto free;
>  
> - ret = sdhci_cdns_phy_init(dev->of_node, priv);
> + sdhci_cdns_phy_param_parse(dev->of_node, priv);
> +
> + ret = sdhci_cdns_phy_init(priv);
>   if (ret)
>   goto free;
>  
> @@ -353,6 +390,48 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
>   return ret;
>  }
>  
> +#ifdef CONFIG_PM_SLEEP
> +static int sdhci_cdns_suspend(struct device *dev)
> +{
> + struct sdhci_host *host = dev_get_drvdata(dev);
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + int ret;
> +
> + if (host->tuning_mode != SDHCI_TUNING_MODE_3)
> +   

Re: [PATCH v3 1/4] mmc: sdhci-cadence: add suspend / resume support

[Adrian Hunter]

On 15/08/17 18:45, Masahiro Yamada wrote:
> Currently, the probe function initializes the PHY, but PHY settings
> are lost during the sleep state.  Restore the PHY registers when
> resuming.
> 
> To facilitate this, split sdhci_cdns_phy_init() into the DT parse
> part and PHY update part so that the latter can be invoked from the
> resume hook.
> 
> Signed-off-by: Masahiro Yamada 

Just one comment about using clk_disable_unprepare() on the error path.

> ---
> 
> Changes in v3:
>  - Use #ifdef CONFIG_PM_SLEEP instead of __maybe_unused
>  - Add own sdhci_cdns_suspend implementation to not depend on
>the core change
> 
> Changes in v2: None
> 
>  drivers/mmc/host/sdhci-cadence.c | 97 
> 
>  1 file changed, 88 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-cadence.c 
> b/drivers/mmc/host/sdhci-cadence.c
> index 19d5698244b5..751ba706bf03 100644
> --- a/drivers/mmc/host/sdhci-cadence.c
> +++ b/drivers/mmc/host/sdhci-cadence.c
> @@ -67,9 +67,16 @@
>   */
>  #define SDHCI_CDNS_MAX_TUNING_LOOP   40
>  
> +struct sdhci_cdns_phy_param {
> + u8 addr;
> + u8 data;
> +};
> +
>  struct sdhci_cdns_priv {
>   void __iomem *hrs_addr;
>   bool enhanced_strobe;
> + unsigned int nr_phy_params;
> + struct sdhci_cdns_phy_param phy_params[0];
>  };
>  
>  struct sdhci_cdns_phy_cfg {
> @@ -115,9 +122,22 @@ static int sdhci_cdns_write_phy_reg(struct 
> sdhci_cdns_priv *priv,
>   return 0;
>  }
>  
> -static int sdhci_cdns_phy_init(struct device_node *np,
> -struct sdhci_cdns_priv *priv)
> +static unsigned int sdhci_cdns_phy_param_count(struct device_node *np)
>  {
> + unsigned int count = 0;
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(sdhci_cdns_phy_cfgs); i++)
> + if (of_property_read_bool(np, sdhci_cdns_phy_cfgs[i].property))
> + count++;
> +
> + return count;
> +}
> +
> +static void sdhci_cdns_phy_param_parse(struct device_node *np,
> +struct sdhci_cdns_priv *priv)
> +{
> + struct sdhci_cdns_phy_param *p = priv->phy_params;
>   u32 val;
>   int ret, i;
>  
> @@ -127,9 +147,19 @@ static int sdhci_cdns_phy_init(struct device_node *np,
>   if (ret)
>   continue;
>  
> - ret = sdhci_cdns_write_phy_reg(priv,
> -sdhci_cdns_phy_cfgs[i].addr,
> -val);
> + p->addr = sdhci_cdns_phy_cfgs[i].addr;
> + p->data = val;
> + p++;
> + }
> +}
> +
> +static int sdhci_cdns_phy_init(struct sdhci_cdns_priv *priv)
> +{
> + int ret, i;
> +
> + for (i = 0; i < priv->nr_phy_params; i++) {
> + ret = sdhci_cdns_write_phy_reg(priv, priv->phy_params[i].addr,
> +priv->phy_params[i].data);
>   if (ret)
>   return ret;
>   }
> @@ -302,6 +332,8 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
>   struct sdhci_pltfm_host *pltfm_host;
>   struct sdhci_cdns_priv *priv;
>   struct clk *clk;
> + size_t priv_size;
> + unsigned int nr_phy_params;
>   int ret;
>   struct device *dev = >dev;
>  
> @@ -313,7 +345,9 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
>   if (ret)
>   return ret;
>  
> - host = sdhci_pltfm_init(pdev, _cdns_pltfm_data, sizeof(*priv));
> + nr_phy_params = sdhci_cdns_phy_param_count(dev->of_node);
> + priv_size = sizeof(*priv) + sizeof(priv->phy_params[0]) * nr_phy_params;
> + host = sdhci_pltfm_init(pdev, _cdns_pltfm_data, priv_size);
>   if (IS_ERR(host)) {
>   ret = PTR_ERR(host);
>   goto disable_clk;
> @@ -322,7 +356,8 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
>   pltfm_host = sdhci_priv(host);
>   pltfm_host->clk = clk;
>  
> - priv = sdhci_cdns_priv(host);
> + priv = sdhci_pltfm_priv(pltfm_host);
> + priv->nr_phy_params = nr_phy_params;
>   priv->hrs_addr = host->ioaddr;
>   priv->enhanced_strobe = false;
>   host->ioaddr += SDHCI_CDNS_SRS_BASE;
> @@ -336,7 +371,9 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
>   if (ret)
>   goto free;
>  
> - ret = sdhci_cdns_phy_init(dev->of_node, priv);
> + sdhci_cdns_phy_param_parse(dev->of_node, priv);
> +
> + ret = sdhci_cdns_phy_init(priv);
>   if (ret)
>   goto free;
>  
> @@ -353,6 +390,48 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
>   return ret;
>  }
>  
> +#ifdef CONFIG_PM_SLEEP
> +static int sdhci_cdns_suspend(struct device *dev)
> +{
> + struct sdhci_host *host = dev_get_drvdata(dev);
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + int ret;
> +
> + if (host->tuning_mode != SDHCI_TUNING_MODE_3)
> + 

[PATCH v3 1/4] mmc: sdhci-cadence: add suspend / resume support

[Masahiro Yamada]

Currently, the probe function initializes the PHY, but PHY settings
are lost during the sleep state.  Restore the PHY registers when
resuming.

To facilitate this, split sdhci_cdns_phy_init() into the DT parse
part and PHY update part so that the latter can be invoked from the
resume hook.

Signed-off-by: Masahiro Yamada 
---

Changes in v3:
 - Use #ifdef CONFIG_PM_SLEEP instead of __maybe_unused
 - Add own sdhci_cdns_suspend implementation to not depend on
   the core change

Changes in v2: None

 drivers/mmc/host/sdhci-cadence.c | 97 
 1 file changed, 88 insertions(+), 9 deletions(-)

diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c
index 19d5698244b5..751ba706bf03 100644
--- a/drivers/mmc/host/sdhci-cadence.c
+++ b/drivers/mmc/host/sdhci-cadence.c
@@ -67,9 +67,16 @@
  */
 #define SDHCI_CDNS_MAX_TUNING_LOOP 40
 
+struct sdhci_cdns_phy_param {
+   u8 addr;
+   u8 data;
+};
+
 struct sdhci_cdns_priv {
void __iomem *hrs_addr;
bool enhanced_strobe;
+   unsigned int nr_phy_params;
+   struct sdhci_cdns_phy_param phy_params[0];
 };
 
 struct sdhci_cdns_phy_cfg {
@@ -115,9 +122,22 @@ static int sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv 
*priv,
return 0;
 }
 
-static int sdhci_cdns_phy_init(struct device_node *np,
-  struct sdhci_cdns_priv *priv)
+static unsigned int sdhci_cdns_phy_param_count(struct device_node *np)
 {
+   unsigned int count = 0;
+   int i;
+
+   for (i = 0; i < ARRAY_SIZE(sdhci_cdns_phy_cfgs); i++)
+   if (of_property_read_bool(np, sdhci_cdns_phy_cfgs[i].property))
+   count++;
+
+   return count;
+}
+
+static void sdhci_cdns_phy_param_parse(struct device_node *np,
+  struct sdhci_cdns_priv *priv)
+{
+   struct sdhci_cdns_phy_param *p = priv->phy_params;
u32 val;
int ret, i;
 
@@ -127,9 +147,19 @@ static int sdhci_cdns_phy_init(struct device_node *np,
if (ret)
continue;
 
-   ret = sdhci_cdns_write_phy_reg(priv,
-  sdhci_cdns_phy_cfgs[i].addr,
-  val);
+   p->addr = sdhci_cdns_phy_cfgs[i].addr;
+   p->data = val;
+   p++;
+   }
+}
+
+static int sdhci_cdns_phy_init(struct sdhci_cdns_priv *priv)
+{
+   int ret, i;
+
+   for (i = 0; i < priv->nr_phy_params; i++) {
+   ret = sdhci_cdns_write_phy_reg(priv, priv->phy_params[i].addr,
+  priv->phy_params[i].data);
if (ret)
return ret;
}
@@ -302,6 +332,8 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
struct sdhci_pltfm_host *pltfm_host;
struct sdhci_cdns_priv *priv;
struct clk *clk;
+   size_t priv_size;
+   unsigned int nr_phy_params;
int ret;
struct device *dev = >dev;
 
@@ -313,7 +345,9 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
if (ret)
return ret;
 
-   host = sdhci_pltfm_init(pdev, _cdns_pltfm_data, sizeof(*priv));
+   nr_phy_params = sdhci_cdns_phy_param_count(dev->of_node);
+   priv_size = sizeof(*priv) + sizeof(priv->phy_params[0]) * nr_phy_params;
+   host = sdhci_pltfm_init(pdev, _cdns_pltfm_data, priv_size);
if (IS_ERR(host)) {
ret = PTR_ERR(host);
goto disable_clk;
@@ -322,7 +356,8 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
pltfm_host = sdhci_priv(host);
pltfm_host->clk = clk;
 
-   priv = sdhci_cdns_priv(host);
+   priv = sdhci_pltfm_priv(pltfm_host);
+   priv->nr_phy_params = nr_phy_params;
priv->hrs_addr = host->ioaddr;
priv->enhanced_strobe = false;
host->ioaddr += SDHCI_CDNS_SRS_BASE;
@@ -336,7 +371,9 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
if (ret)
goto free;
 
-   ret = sdhci_cdns_phy_init(dev->of_node, priv);
+   sdhci_cdns_phy_param_parse(dev->of_node, priv);
+
+   ret = sdhci_cdns_phy_init(priv);
if (ret)
goto free;
 
@@ -353,6 +390,48 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
return ret;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int sdhci_cdns_suspend(struct device *dev)
+{
+   struct sdhci_host *host = dev_get_drvdata(dev);
+   struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+   int ret;
+
+   if (host->tuning_mode != SDHCI_TUNING_MODE_3)
+   mmc_retune_needed(host->mmc);
+
+   ret = sdhci_suspend_host(host);
+   if (ret)
+   return ret;
+
+   clk_disable_unprepare(pltfm_host->clk);
+
+   return 0;
+}
+
+static int sdhci_cdns_resume(struct device *dev)
+{
+   struct 

[PATCH v3 1/4] mmc: sdhci-cadence: add suspend / resume support

[Masahiro Yamada]

Currently, the probe function initializes the PHY, but PHY settings
are lost during the sleep state.  Restore the PHY registers when
resuming.

To facilitate this, split sdhci_cdns_phy_init() into the DT parse
part and PHY update part so that the latter can be invoked from the
resume hook.

Signed-off-by: Masahiro Yamada 
---

Changes in v3:
 - Use #ifdef CONFIG_PM_SLEEP instead of __maybe_unused
 - Add own sdhci_cdns_suspend implementation to not depend on
   the core change

Changes in v2: None

 drivers/mmc/host/sdhci-cadence.c | 97 
 1 file changed, 88 insertions(+), 9 deletions(-)

diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c
index 19d5698244b5..751ba706bf03 100644
--- a/drivers/mmc/host/sdhci-cadence.c
+++ b/drivers/mmc/host/sdhci-cadence.c
@@ -67,9 +67,16 @@
  */
 #define SDHCI_CDNS_MAX_TUNING_LOOP 40
 
+struct sdhci_cdns_phy_param {
+   u8 addr;
+   u8 data;
+};
+
 struct sdhci_cdns_priv {
void __iomem *hrs_addr;
bool enhanced_strobe;
+   unsigned int nr_phy_params;
+   struct sdhci_cdns_phy_param phy_params[0];
 };
 
 struct sdhci_cdns_phy_cfg {
@@ -115,9 +122,22 @@ static int sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv 
*priv,
return 0;
 }
 
-static int sdhci_cdns_phy_init(struct device_node *np,
-  struct sdhci_cdns_priv *priv)
+static unsigned int sdhci_cdns_phy_param_count(struct device_node *np)
 {
+   unsigned int count = 0;
+   int i;
+
+   for (i = 0; i < ARRAY_SIZE(sdhci_cdns_phy_cfgs); i++)
+   if (of_property_read_bool(np, sdhci_cdns_phy_cfgs[i].property))
+   count++;
+
+   return count;
+}
+
+static void sdhci_cdns_phy_param_parse(struct device_node *np,
+  struct sdhci_cdns_priv *priv)
+{
+   struct sdhci_cdns_phy_param *p = priv->phy_params;
u32 val;
int ret, i;
 
@@ -127,9 +147,19 @@ static int sdhci_cdns_phy_init(struct device_node *np,
if (ret)
continue;
 
-   ret = sdhci_cdns_write_phy_reg(priv,
-  sdhci_cdns_phy_cfgs[i].addr,
-  val);
+   p->addr = sdhci_cdns_phy_cfgs[i].addr;
+   p->data = val;
+   p++;
+   }
+}
+
+static int sdhci_cdns_phy_init(struct sdhci_cdns_priv *priv)
+{
+   int ret, i;
+
+   for (i = 0; i < priv->nr_phy_params; i++) {
+   ret = sdhci_cdns_write_phy_reg(priv, priv->phy_params[i].addr,
+  priv->phy_params[i].data);
if (ret)
return ret;
}
@@ -302,6 +332,8 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
struct sdhci_pltfm_host *pltfm_host;
struct sdhci_cdns_priv *priv;
struct clk *clk;
+   size_t priv_size;
+   unsigned int nr_phy_params;
int ret;
struct device *dev = >dev;
 
@@ -313,7 +345,9 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
if (ret)
return ret;
 
-   host = sdhci_pltfm_init(pdev, _cdns_pltfm_data, sizeof(*priv));
+   nr_phy_params = sdhci_cdns_phy_param_count(dev->of_node);
+   priv_size = sizeof(*priv) + sizeof(priv->phy_params[0]) * nr_phy_params;
+   host = sdhci_pltfm_init(pdev, _cdns_pltfm_data, priv_size);
if (IS_ERR(host)) {
ret = PTR_ERR(host);
goto disable_clk;
@@ -322,7 +356,8 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
pltfm_host = sdhci_priv(host);
pltfm_host->clk = clk;
 
-   priv = sdhci_cdns_priv(host);
+   priv = sdhci_pltfm_priv(pltfm_host);
+   priv->nr_phy_params = nr_phy_params;
priv->hrs_addr = host->ioaddr;
priv->enhanced_strobe = false;
host->ioaddr += SDHCI_CDNS_SRS_BASE;
@@ -336,7 +371,9 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
if (ret)
goto free;
 
-   ret = sdhci_cdns_phy_init(dev->of_node, priv);
+   sdhci_cdns_phy_param_parse(dev->of_node, priv);
+
+   ret = sdhci_cdns_phy_init(priv);
if (ret)
goto free;
 
@@ -353,6 +390,48 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
return ret;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int sdhci_cdns_suspend(struct device *dev)
+{
+   struct sdhci_host *host = dev_get_drvdata(dev);
+   struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+   int ret;
+
+   if (host->tuning_mode != SDHCI_TUNING_MODE_3)
+   mmc_retune_needed(host->mmc);
+
+   ret = sdhci_suspend_host(host);
+   if (ret)
+   return ret;
+
+   clk_disable_unprepare(pltfm_host->clk);
+
+   return 0;
+}
+
+static int sdhci_cdns_resume(struct device *dev)
+{
+   struct sdhci_host *host =