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SubjectRe: [PATCH] mmc: xenon: enable ACPI support in the driver
Hi Adrian,


niedz., 15 lis 2020 o 21:43 Adrian Hunter <adrian.hunter@intel.com> napisał(a):
>
> On 14/11/20 11:08 am, Marcin Wojtas wrote:
> > This patch introduces an alternative way of obtaining resources - via
> > ACPI tables provided by firmware. In addition to the of_* -> device_*
> > API replacement, sdhci_xenon_acpi_match table was introduced.
> > Also, the entire supply clocks configuration had to be skipped,
> > because in case of ACPI it is firmware responsibility to enable them.
> >
> > Signed-off-by: Marcin Wojtas <mw@semihalf.com>
>
> Seems fine, but maybe split into 3 patches:
> 1. of_property -> device_property changes and renaming
> 2. clock changes (if it seems neater, maybe try to simplify to 2 new
> functions: one to prepare clocks and one to unprepare clocks)
> 3. add ACPI device id
>

Sure, will do.

Thanks,
Marcin

> > ---
> > Hi,
> >
> > In case anyone would like to test the patch, I share the EDK2
> > firmware for MacchiatoBin board, which has relevant ACPI
> > description https://drive.google.com/file/d/1ygdHGl30ww9LAqZAQlTsz2nnhN3Od9GG
> >
> > Looking forward to your feedback.
> >
> > Best regards,
> > Marcin
> >
> > drivers/mmc/host/sdhci-xenon.h | 4 +-
> > drivers/mmc/host/sdhci-xenon-phy.c | 36 ++++---
> > drivers/mmc/host/sdhci-xenon.c | 109 +++++++++++++-------
> > 3 files changed, 91 insertions(+), 58 deletions(-)
> >
> > diff --git a/drivers/mmc/host/sdhci-xenon.h b/drivers/mmc/host/sdhci-xenon.h
> > index 593b82d7b68a..542b6ad35ff3 100644
> > --- a/drivers/mmc/host/sdhci-xenon.h
> > +++ b/drivers/mmc/host/sdhci-xenon.h
> > @@ -93,8 +93,8 @@ struct xenon_priv {
> > };
> >
> > int xenon_phy_adj(struct sdhci_host *host, struct mmc_ios *ios);
> > -int xenon_phy_parse_dt(struct device_node *np,
> > - struct sdhci_host *host);
> > +int xenon_phy_parse_params(struct device *dev,
> > + struct sdhci_host *host);
> > void xenon_soc_pad_ctrl(struct sdhci_host *host,
> > unsigned char signal_voltage);
> > #endif
> > diff --git a/drivers/mmc/host/sdhci-xenon-phy.c b/drivers/mmc/host/sdhci-xenon-phy.c
> > index 03ce57ef4585..a6df95ec31c5 100644
> > --- a/drivers/mmc/host/sdhci-xenon-phy.c
> > +++ b/drivers/mmc/host/sdhci-xenon-phy.c
> > @@ -689,35 +689,37 @@ static int get_dt_pad_ctrl_data(struct sdhci_host *host,
> > return ret;
> > }
> >
> > -static int xenon_emmc_phy_parse_param_dt(struct sdhci_host *host,
> > - struct device_node *np,
> > - struct xenon_emmc_phy_params *params)
> > +static int xenon_emmc_phy_parse_params(struct sdhci_host *host,
> > + struct device *dev,
> > + struct xenon_emmc_phy_params *params)
> > {
> > u32 value;
> >
> > params->slow_mode = false;
> > - if (of_property_read_bool(np, "marvell,xenon-phy-slow-mode"))
> > + if (device_property_read_bool(dev, "marvell,xenon-phy-slow-mode"))
> > params->slow_mode = true;
> >
> > params->znr = XENON_ZNR_DEF_VALUE;
> > - if (!of_property_read_u32(np, "marvell,xenon-phy-znr", &value))
> > + if (!device_property_read_u32(dev, "marvell,xenon-phy-znr", &value))
> > params->znr = value & XENON_ZNR_MASK;
> >
> > params->zpr = XENON_ZPR_DEF_VALUE;
> > - if (!of_property_read_u32(np, "marvell,xenon-phy-zpr", &value))
> > + if (!device_property_read_u32(dev, "marvell,xenon-phy-zpr", &value))
> > params->zpr = value & XENON_ZPR_MASK;
> >
> > params->nr_tun_times = XENON_TUN_CONSECUTIVE_TIMES;
> > - if (!of_property_read_u32(np, "marvell,xenon-phy-nr-success-tun",
> > - &value))
> > + if (!device_property_read_u32(dev, "marvell,xenon-phy-nr-success-tun",
> > + &value))
> > params->nr_tun_times = value & XENON_TUN_CONSECUTIVE_TIMES_MASK;
> >
> > params->tun_step_divider = XENON_TUNING_STEP_DIVIDER;
> > - if (!of_property_read_u32(np, "marvell,xenon-phy-tun-step-divider",
> > - &value))
> > + if (!device_property_read_u32(dev, "marvell,xenon-phy-tun-step-divider",
> > + &value))
> > params->tun_step_divider = value & 0xFF;
> >
> > - return get_dt_pad_ctrl_data(host, np, params);
> > + if (dev->of_node)
> > + return get_dt_pad_ctrl_data(host, dev->of_node, params);
> > + return 0;
> > }
> >
> > /* Set SoC PHY Voltage PAD */
> > @@ -811,7 +813,7 @@ int xenon_phy_adj(struct sdhci_host *host, struct mmc_ios *ios)
> > return ret;
> > }
> >
> > -static int xenon_add_phy(struct device_node *np, struct sdhci_host *host,
> > +static int xenon_add_phy(struct device *dev, struct sdhci_host *host,
> > const char *phy_name)
> > {
> > struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > @@ -830,15 +832,15 @@ static int xenon_add_phy(struct device_node *np, struct sdhci_host *host,
> > if (ret)
> > return ret;
> >
> > - return xenon_emmc_phy_parse_param_dt(host, np, priv->phy_params);
> > + return xenon_emmc_phy_parse_params(host, dev, priv->phy_params);
> > }
> >
> > -int xenon_phy_parse_dt(struct device_node *np, struct sdhci_host *host)
> > +int xenon_phy_parse_params(struct device *dev, struct sdhci_host *host)
> > {
> > const char *phy_type = NULL;
> >
> > - if (!of_property_read_string(np, "marvell,xenon-phy-type", &phy_type))
> > - return xenon_add_phy(np, host, phy_type);
> > + if (!device_property_read_string(dev, "marvell,xenon-phy-type", &phy_type))
> > + return xenon_add_phy(dev, host, phy_type);
> >
> > - return xenon_add_phy(np, host, "emmc 5.1 phy");
> > + return xenon_add_phy(dev, host, "emmc 5.1 phy");
> > }
> > diff --git a/drivers/mmc/host/sdhci-xenon.c b/drivers/mmc/host/sdhci-xenon.c
> > index 24c978de2a3f..f2990e474e58 100644
> > --- a/drivers/mmc/host/sdhci-xenon.c
> > +++ b/drivers/mmc/host/sdhci-xenon.c
> > @@ -11,6 +11,7 @@
> > * Special thanks to Video BG4 project team.
> > */
> >
> > +#include <linux/acpi.h>
> > #include <linux/delay.h>
> > #include <linux/ktime.h>
> > #include <linux/module.h>
> > @@ -247,6 +248,16 @@ static void xenon_voltage_switch(struct sdhci_host *host)
> > sdhci_readw(host, SDHCI_HOST_CONTROL2);
> > }
> >
> > +static unsigned int xenon_get_max_clock(struct sdhci_host *host)
> > +{
> > + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > +
> > + if (pltfm_host->clk)
> > + return sdhci_pltfm_clk_get_max_clock(host);
> > + else
> > + return pltfm_host->clock;
> > +}
> > +
> > static const struct sdhci_ops sdhci_xenon_ops = {
> > .voltage_switch = xenon_voltage_switch,
> > .set_clock = sdhci_set_clock,
> > @@ -254,7 +265,7 @@ static const struct sdhci_ops sdhci_xenon_ops = {
> > .set_bus_width = sdhci_set_bus_width,
> > .reset = xenon_reset,
> > .set_uhs_signaling = xenon_set_uhs_signaling,
> > - .get_max_clock = sdhci_pltfm_clk_get_max_clock,
> > + .get_max_clock = xenon_get_max_clock,
> > };
> >
> > static const struct sdhci_pltfm_data sdhci_xenon_pdata = {
> > @@ -407,9 +418,9 @@ static void xenon_replace_mmc_host_ops(struct sdhci_host *host)
> > * Refer to XENON_SYS_CFG_INFO register
> > * tun-count: the interval between re-tuning
> > */
> > -static int xenon_probe_dt(struct platform_device *pdev)
> > +static int xenon_probe_params(struct platform_device *pdev)
> > {
> > - struct device_node *np = pdev->dev.of_node;
> > + struct device *dev = &pdev->dev;
> > struct sdhci_host *host = platform_get_drvdata(pdev);
> > struct mmc_host *mmc = host->mmc;
> > struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > @@ -418,11 +429,12 @@ static int xenon_probe_dt(struct platform_device *pdev)
> > u32 tuning_count;
> >
> > /* Disable HS200 on Armada AP806 */
> > - if (of_device_is_compatible(np, "marvell,armada-ap806-sdhci"))
> > + if (device_property_match_string(dev, "compatible",
> > + "marvell,armada-ap806-sdhci") >= 0)
> > host->quirks2 |= SDHCI_QUIRK2_BROKEN_HS200;
> >
> > sdhc_id = 0x0;
> > - if (!of_property_read_u32(np, "marvell,xenon-sdhc-id", &sdhc_id)) {
> > + if (!device_property_read_u32(dev, "marvell,xenon-sdhc-id", &sdhc_id)) {
> > nr_sdhc = sdhci_readl(host, XENON_SYS_CFG_INFO);
> > nr_sdhc &= XENON_NR_SUPPORTED_SLOT_MASK;
> > if (unlikely(sdhc_id > nr_sdhc)) {
> > @@ -434,8 +446,8 @@ static int xenon_probe_dt(struct platform_device *pdev)
> > priv->sdhc_id = sdhc_id;
> >
> > tuning_count = XENON_DEF_TUNING_COUNT;
> > - if (!of_property_read_u32(np, "marvell,xenon-tun-count",
> > - &tuning_count)) {
> > + if (!device_property_read_u32(dev, "marvell,xenon-tun-count",
> > + &tuning_count)) {
> > if (unlikely(tuning_count >= XENON_TMR_RETUN_NO_PRESENT)) {
> > dev_err(mmc_dev(mmc), "Wrong Re-tuning Count. Set default value %d\n",
> > XENON_DEF_TUNING_COUNT);
> > @@ -444,7 +456,7 @@ static int xenon_probe_dt(struct platform_device *pdev)
> > }
> > priv->tuning_count = tuning_count;
> >
> > - return xenon_phy_parse_dt(np, host);
> > + return xenon_phy_parse_params(dev, host);
> > }
> >
> > static int xenon_sdhc_prepare(struct sdhci_host *host)
> > @@ -483,6 +495,7 @@ static void xenon_sdhc_unprepare(struct sdhci_host *host)
> > static int xenon_probe(struct platform_device *pdev)
> > {
> > struct sdhci_pltfm_host *pltfm_host;
> > + struct device *dev = &pdev->dev;
> > struct sdhci_host *host;
> > struct xenon_priv *priv;
> > int err;
> > @@ -501,37 +514,39 @@ static int xenon_probe(struct platform_device *pdev)
> > */
> > xenon_replace_mmc_host_ops(host);
> >
> > - pltfm_host->clk = devm_clk_get(&pdev->dev, "core");
> > - if (IS_ERR(pltfm_host->clk)) {
> > - err = PTR_ERR(pltfm_host->clk);
> > - dev_err(&pdev->dev, "Failed to setup input clk: %d\n", err);
> > - goto free_pltfm;
> > - }
> > - err = clk_prepare_enable(pltfm_host->clk);
> > - if (err)
> > - goto free_pltfm;
> > -
> > - priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
> > - if (IS_ERR(priv->axi_clk)) {
> > - err = PTR_ERR(priv->axi_clk);
> > - if (err == -EPROBE_DEFER)
> > - goto err_clk;
> > - } else {
> > - err = clk_prepare_enable(priv->axi_clk);
> > + if (dev->of_node) {
> > + pltfm_host->clk = devm_clk_get(&pdev->dev, "core");
> > + if (IS_ERR(pltfm_host->clk)) {
> > + err = PTR_ERR(pltfm_host->clk);
> > + dev_err(&pdev->dev, "Failed to setup input clk: %d\n", err);
> > + goto free_pltfm;
> > + }
> > + err = clk_prepare_enable(pltfm_host->clk);
> > if (err)
> > - goto err_clk;
> > + goto free_pltfm;
> > +
> > + priv->axi_clk = devm_clk_get(&pdev->dev, "axi");
> > + if (IS_ERR(priv->axi_clk)) {
> > + err = PTR_ERR(priv->axi_clk);
> > + if (err == -EPROBE_DEFER)
> > + goto err_clk;
> > + } else {
> > + err = clk_prepare_enable(priv->axi_clk);
> > + if (err)
> > + goto err_clk;
> > + }
> > }
> >
> > err = mmc_of_parse(host->mmc);
> > if (err)
> > goto err_clk_axi;
> >
> > - sdhci_get_of_property(pdev);
> > + sdhci_get_property(pdev);
> >
> > xenon_set_acg(host, false);
> >
> > - /* Xenon specific dt parse */
> > - err = xenon_probe_dt(pdev);
> > + /* Xenon specific parameters parse */
> > + err = xenon_probe_params(pdev);
> > if (err)
> > goto err_clk_axi;
> >
> > @@ -559,9 +574,11 @@ static int xenon_probe(struct platform_device *pdev)
> > pm_runtime_put_noidle(&pdev->dev);
> > xenon_sdhc_unprepare(host);
> > err_clk_axi:
> > - clk_disable_unprepare(priv->axi_clk);
> > + if (dev->of_node)
> > + clk_disable_unprepare(priv->axi_clk);
> > err_clk:
> > - clk_disable_unprepare(pltfm_host->clk);
> > + if (dev->of_node)
> > + clk_disable_unprepare(pltfm_host->clk);
> > free_pltfm:
> > sdhci_pltfm_free(pdev);
> > return err;
> > @@ -572,6 +589,7 @@ static int xenon_remove(struct platform_device *pdev)
> > struct sdhci_host *host = platform_get_drvdata(pdev);
> > struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> > struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
> > + struct device *dev = &pdev->dev;
> >
> > pm_runtime_get_sync(&pdev->dev);
> > pm_runtime_disable(&pdev->dev);
> > @@ -580,8 +598,10 @@ static int xenon_remove(struct platform_device *pdev)
> > sdhci_remove_host(host, 0);
> >
> > xenon_sdhc_unprepare(host);
> > - clk_disable_unprepare(priv->axi_clk);
> > - clk_disable_unprepare(pltfm_host->clk);
> > + if (dev->of_node) {
> > + clk_disable_unprepare(priv->axi_clk);
> > + clk_disable_unprepare(pltfm_host->clk);
> > + }
> >
> > sdhci_pltfm_free(pdev);
> >
> > @@ -618,7 +638,8 @@ static int xenon_runtime_suspend(struct device *dev)
> > if (host->tuning_mode != SDHCI_TUNING_MODE_3)
> > mmc_retune_needed(host->mmc);
> >
> > - clk_disable_unprepare(pltfm_host->clk);
> > + if (dev->of_node)
> > + clk_disable_unprepare(pltfm_host->clk);
> > /*
> > * Need to update the priv->clock here, or when runtime resume
> > * back, phy don't aware the clock change and won't adjust phy
> > @@ -635,10 +656,12 @@ static int xenon_runtime_resume(struct device *dev)
> > struct xenon_priv *priv = sdhci_pltfm_priv(pltfm_host);
> > int ret;
> >
> > - ret = clk_prepare_enable(pltfm_host->clk);
> > - if (ret) {
> > - dev_err(dev, "can't enable mainck\n");
> > - return ret;
> > + if (dev->of_node) {
> > + ret = clk_prepare_enable(pltfm_host->clk);
> > + if (ret) {
> > + dev_err(dev, "can't enable mainck\n");
> > + return ret;
> > + }
> > }
> >
> > if (priv->restore_needed) {
> > @@ -653,7 +676,8 @@ static int xenon_runtime_resume(struct device *dev)
> > goto out;
> > return 0;
> > out:
> > - clk_disable_unprepare(pltfm_host->clk);
> > + if (dev->of_node)
> > + clk_disable_unprepare(pltfm_host->clk);
> > return ret;
> > }
> > #endif /* CONFIG_PM */
> > @@ -674,11 +698,18 @@ static const struct of_device_id sdhci_xenon_dt_ids[] = {
> > };
> > MODULE_DEVICE_TABLE(of, sdhci_xenon_dt_ids);
> >
> > +static const struct acpi_device_id sdhci_xenon_acpi_ids[] = {
> > + { .id = "MRVL0002",},
> > + {}
> > +};
> > +MODULE_DEVICE_TABLE(acpi, sdhci_xenon_acpi_ids);
> > +
> > static struct platform_driver sdhci_xenon_driver = {
> > .driver = {
> > .name = "xenon-sdhci",
> > .probe_type = PROBE_PREFER_ASYNCHRONOUS,
> > .of_match_table = sdhci_xenon_dt_ids,
> > + .acpi_match_table = ACPI_PTR(sdhci_xenon_acpi_ids),
> > .pm = &sdhci_xenon_dev_pm_ops,
> > },
> > .probe = xenon_probe,
> >
>

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