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@socionext.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Masahiro Yamada
Ulf Hansson
parent
aab6e25a5a
commit
a232a8f2d1
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@ -67,9 +67,16 @@
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*/
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#define SDHCI_CDNS_MAX_TUNING_LOOP 40
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struct sdhci_cdns_phy_param {
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u8 addr;
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u8 data;
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};
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struct sdhci_cdns_priv {
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void __iomem *hrs_addr;
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bool enhanced_strobe;
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unsigned int nr_phy_params;
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struct sdhci_cdns_phy_param phy_params[0];
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};
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struct sdhci_cdns_phy_cfg {
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@ -115,9 +122,22 @@ static int sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv,
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return 0;
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}
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static int sdhci_cdns_phy_init(struct device_node *np,
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struct sdhci_cdns_priv *priv)
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static unsigned int sdhci_cdns_phy_param_count(struct device_node *np)
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{
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unsigned int count = 0;
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int i;
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for (i = 0; i < ARRAY_SIZE(sdhci_cdns_phy_cfgs); i++)
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if (of_property_read_bool(np, sdhci_cdns_phy_cfgs[i].property))
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count++;
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return count;
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}
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static void sdhci_cdns_phy_param_parse(struct device_node *np,
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struct sdhci_cdns_priv *priv)
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{
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struct sdhci_cdns_phy_param *p = priv->phy_params;
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u32 val;
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int ret, i;
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@ -127,9 +147,19 @@ static int sdhci_cdns_phy_init(struct device_node *np,
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if (ret)
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continue;
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ret = sdhci_cdns_write_phy_reg(priv,
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sdhci_cdns_phy_cfgs[i].addr,
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val);
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p->addr = sdhci_cdns_phy_cfgs[i].addr;
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p->data = val;
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p++;
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}
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}
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static int sdhci_cdns_phy_init(struct sdhci_cdns_priv *priv)
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{
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int ret, i;
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for (i = 0; i < priv->nr_phy_params; i++) {
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ret = sdhci_cdns_write_phy_reg(priv, priv->phy_params[i].addr,
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priv->phy_params[i].data);
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if (ret)
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return ret;
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}
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@ -302,6 +332,8 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
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struct sdhci_pltfm_host *pltfm_host;
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struct sdhci_cdns_priv *priv;
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struct clk *clk;
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size_t priv_size;
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unsigned int nr_phy_params;
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int ret;
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struct device *dev = &pdev->dev;
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@ -313,7 +345,9 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
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if (ret)
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return ret;
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host = sdhci_pltfm_init(pdev, &sdhci_cdns_pltfm_data, sizeof(*priv));
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nr_phy_params = sdhci_cdns_phy_param_count(dev->of_node);
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priv_size = sizeof(*priv) + sizeof(priv->phy_params[0]) * nr_phy_params;
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host = sdhci_pltfm_init(pdev, &sdhci_cdns_pltfm_data, priv_size);
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if (IS_ERR(host)) {
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ret = PTR_ERR(host);
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goto disable_clk;
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@ -322,7 +356,8 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
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pltfm_host = sdhci_priv(host);
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pltfm_host->clk = clk;
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priv = sdhci_cdns_priv(host);
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priv = sdhci_pltfm_priv(pltfm_host);
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priv->nr_phy_params = nr_phy_params;
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priv->hrs_addr = host->ioaddr;
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priv->enhanced_strobe = false;
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host->ioaddr += SDHCI_CDNS_SRS_BASE;
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@ -336,7 +371,9 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
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if (ret)
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goto free;
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ret = sdhci_cdns_phy_init(dev->of_node, priv);
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sdhci_cdns_phy_param_parse(dev->of_node, priv);
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ret = sdhci_cdns_phy_init(priv);
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if (ret)
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goto free;
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@ -353,6 +390,57 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
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return ret;
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}
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#ifdef CONFIG_PM_SLEEP
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static int sdhci_cdns_suspend(struct device *dev)
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{
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struct sdhci_host *host = dev_get_drvdata(dev);
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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int ret;
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if (host->tuning_mode != SDHCI_TUNING_MODE_3)
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mmc_retune_needed(host->mmc);
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ret = sdhci_suspend_host(host);
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if (ret)
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return ret;
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clk_disable_unprepare(pltfm_host->clk);
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return 0;
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}
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static int sdhci_cdns_resume(struct device *dev)
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{
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struct sdhci_host *host = dev_get_drvdata(dev);
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct sdhci_cdns_priv *priv = sdhci_pltfm_priv(pltfm_host);
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int ret;
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ret = clk_prepare_enable(pltfm_host->clk);
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if (ret)
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return ret;
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ret = sdhci_cdns_phy_init(priv);
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if (ret)
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goto disable_clk;
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ret = sdhci_resume_host(host);
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if (ret)
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goto disable_clk;
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return 0;
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disable_clk:
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clk_disable_unprepare(pltfm_host->clk);
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return ret;
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}
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#endif
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static const struct dev_pm_ops sdhci_cdns_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(sdhci_cdns_suspend, sdhci_cdns_resume)
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};
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static const struct of_device_id sdhci_cdns_match[] = {
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{ .compatible = "socionext,uniphier-sd4hc" },
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{ .compatible = "cdns,sd4hc" },
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@ -363,7 +451,7 @@ MODULE_DEVICE_TABLE(of, sdhci_cdns_match);
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static struct platform_driver sdhci_cdns_driver = {
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.driver = {
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.name = "sdhci-cdns",
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.pm = &sdhci_pltfm_pmops,
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.pm = &sdhci_cdns_pm_ops,
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.of_match_table = sdhci_cdns_match,
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},
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.probe = sdhci_cdns_probe,
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