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Message-Id: <1503461703-16225-2-git-send-email-yamada.masahiro@socionext.com>
Date: Wed, 23 Aug 2017 13:15:00 +0900
From: Masahiro Yamada <yamada.masahiro@...ionext.com>
To: linux-mmc@...r.kernel.org
Cc: Piotr Sroka <piotrs@...ence.com>, Hu Ziji <huziji@...vell.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Christian Daudt <csd@...adcom.com>,
Scott Branden <sbranden@...adcom.com>,
Zhangfei Gao <zhangfei.gao@...vell.com>,
Kevin Hao <haokexin@...il.com>,
Olof Johansson <olof@...om.net>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
linux-kernel@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH v4 1/4] mmc: sdhci-cadence: add suspend / resume support
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@...ionext.com>
---
Changes in v4:
- disable clk if resume fails.
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 | 106 +++++++++++++++++++++++++++++++++++----
1 file changed, 97 insertions(+), 9 deletions(-)
diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c
index 19d5698244b5..3dca3b3c6436 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 +390,57 @@ 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 = 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)
+ goto disable_clk;
+
+ ret = sdhci_resume_host(host);
+ if (ret)
+ goto disable_clk;
+
+ return 0;
+
+disable_clk:
+ clk_disable_unprepare(pltfm_host->clk);
+
+ return ret;
+}
+#endif
+
+static const struct dev_pm_ops sdhci_cdns_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(sdhci_cdns_suspend, sdhci_cdns_resume)
+};
+
static const struct of_device_id sdhci_cdns_match[] = {
{ .compatible = "socionext,uniphier-sd4hc" },
{ .compatible = "cdns,sd4hc" },
@@ -363,7 +451,7 @@ 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,
--
2.7.4
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