diff mbox series

[3/3] mmc: sdhci-cadence: add suspend / resume support

Message ID 1501505809-393-4-git-send-email-yamada.masahiro@socionext.com
State Superseded
Headers show
Series None | expand

Commit Message

Masahiro Yamada July 31, 2017, 12:56 p.m. UTC
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 <yamada.masahiro@socionext.com>

---

 drivers/mmc/host/sdhci-cadence.c | 77 +++++++++++++++++++++++++++++++++++-----
 1 file changed, 68 insertions(+), 9 deletions(-)

-- 
2.7.4

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Comments

kernel test robot Aug. 2, 2017, 3:24 p.m. UTC | #1
Hi Masahiro,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.13-rc3 next-20170802]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Masahiro-Yamada/mmc-sdhci-enable-disable-the-clock-in-sdhci_pltfm_suspend-resume/20170801-021149
config: openrisc-allyesconfig (attached as .config)
compiler: or1k-linux-gcc (GCC) 5.4.0
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=openrisc 

All errors (new ones prefixed by >>):

   drivers/mmc//host/sdhci-cadence.c: In function 'sdhci_cdns_resume':
>> drivers/mmc//host/sdhci-cadence.c:408:9: error: implicit declaration of function 'sdhci_resume_host' [-Werror=implicit-function-declaration]

     return sdhci_resume_host(host);
            ^
   cc1: some warnings being treated as errors

vim +/sdhci_resume_host +408 drivers/mmc//host/sdhci-cadence.c

   392	
   393	static int __maybe_unused sdhci_cdns_resume(struct device *dev)
   394	{
   395		struct sdhci_host *host = dev_get_drvdata(dev);
   396		struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
   397		struct sdhci_cdns_priv *priv = sdhci_pltfm_priv(pltfm_host);
   398		int ret;
   399	
   400		ret = clk_prepare_enable(pltfm_host->clk);
   401		if (ret)
   402			return ret;
   403	
   404		ret = sdhci_cdns_phy_init(priv);
   405		if (ret)
   406			return ret;
   407	
 > 408		return sdhci_resume_host(host);

   409	}
   410	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
diff mbox series

Patch

diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c
index 19d5698244b5..7473766801a5 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 = &pdev->dev;
 
@@ -313,7 +345,9 @@  static int sdhci_cdns_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	host = sdhci_pltfm_init(pdev, &sdhci_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, &sdhci_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 +390,28 @@  static int sdhci_cdns_probe(struct platform_device *pdev)
 	return ret;
 }
 
+static int __maybe_unused 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;
+
+	return sdhci_resume_host(host);
+}
+
+static const struct dev_pm_ops sdhci_cdns_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(sdhci_pltfm_suspend, sdhci_cdns_resume)
+};
+
 static const struct of_device_id sdhci_cdns_match[] = {
 	{ .compatible = "socionext,uniphier-sd4hc" },
 	{ .compatible = "cdns,sd4hc" },
@@ -363,7 +422,7 @@  MODULE_DEVICE_TABLE(of, sdhci_cdns_match);
 static struct platform_driver sdhci_cdns_driver = {
 	.driver = {
 		.name = "sdhci-cdns",
-		.pm = &sdhci_pltfm_pmops,
+		.pm = &sdhci_cdns_pm_ops,
 		.of_match_table = sdhci_cdns_match,
 	},
 	.probe = sdhci_cdns_probe,