Balaji T K <[email protected]> writes:
> add runtime pm support to HSMMC host controller
> Use runtime pm API to enable/disable HSMMC clock
> Use runtime autosuspend APIs to enable auto suspend delay
>
> Based on OMAP HSMMC runtime implementation by Kevin Hilman, Kishore Kadiyala
>
> Signed-off-by: Balaji T K <[email protected]>
> ---
> drivers/mmc/host/omap_hsmmc.c | 127
> ++++++++++++++++++++++-------------------
> 1 files changed, 69 insertions(+), 58 deletions(-)
>
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index beb3249..5b81d8b 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -33,6 +33,7 @@
> #include <linux/semaphore.h>
> #include <linux/gpio.h>
> #include <linux/regulator/consumer.h>
> +#include <linux/pm_runtime.h>
> #include <plat/dma.h>
> #include <mach/hardware.h>
> #include <plat/board.h>
> @@ -116,6 +117,7 @@
> #define OMAP_MMC4_DEVID 3
> #define OMAP_MMC5_DEVID 4
>
> +#define MMC_AUTOSUSPEND_DELAY 50
> #define MMC_TIMEOUT_MS 20
> #define OMAP_MMC_MASTER_CLOCK 96000000
> #define DRIVER_NAME "omap_hsmmc"
> @@ -1149,8 +1151,7 @@ static int omap_hsmmc_switch_opcond(struct
> omap_hsmmc_host *host, int vdd)
> int ret;
>
> /* Disable the clocks */
> - clk_disable(host->fclk);
> - clk_disable(host->iclk);
> + pm_runtime_put_sync(host->dev);
> if (host->got_dbclk)
> clk_disable(host->dbclk);
>
> @@ -1161,8 +1162,7 @@ static int omap_hsmmc_switch_opcond(struct
> omap_hsmmc_host *host, int vdd)
> if (!ret)
> ret = mmc_slot(host).set_power(host->dev, host->slot_id, 1,
> vdd);
> - clk_enable(host->iclk);
> - clk_enable(host->fclk);
> + pm_runtime_get_sync(host->dev);
> if (host->got_dbclk)
> clk_enable(host->dbclk);
>
> @@ -1528,7 +1528,7 @@ static void omap_hsmmc_set_ios(struct mmc_host *mmc,
> struct mmc_ios *ios)
> u32 con;
> int do_send_init_stream = 0;
>
> - mmc_host_enable(host->mmc);
> + pm_runtime_get_sync(host->dev);
>
> if (ios->power_mode != host->power_mode) {
> switch (ios->power_mode) {
> @@ -1623,8 +1623,7 @@ static void omap_hsmmc_set_ios(struct mmc_host *mmc,
> struct mmc_ios *ios)
> else
> OMAP_HSMMC_WRITE(host->base, CON, con & ~OD);
>
> - if (host->power_mode == MMC_POWER_OFF)
> - mmc_host_disable(host->mmc);
> + pm_runtime_put_autosuspend(host->dev);
> }
>
> static int omap_hsmmc_get_cd(struct mmc_host *mmc)
> @@ -1680,32 +1679,28 @@ static void omap_hsmmc_conf_bus_power(struct
> omap_hsmmc_host *host)
> set_sd_bus_power(host);
> }
>
> -static int omap_hsmmc_enable_fclk(struct mmc_host *mmc)
> +static int omap_hsmmc_enable(struct mmc_host *mmc)
> {
> struct omap_hsmmc_host *host = mmc_priv(mmc);
> - int err;
>
> - err = clk_enable(host->fclk);
> - if (err)
> - return err;
> - dev_dbg(mmc_dev(host->mmc), "mmc_fclk: enabled\n");
> - omap_hsmmc_context_restore(host);
> + pm_runtime_get_sync(host->dev);
> +
> return 0;
> }
>
> -static int omap_hsmmc_disable_fclk(struct mmc_host *mmc, int lazy)
> +static int omap_hsmmc_disable(struct mmc_host *mmc, int lazy)
> {
> struct omap_hsmmc_host *host = mmc_priv(mmc);
>
> - omap_hsmmc_context_save(host);
> - clk_disable(host->fclk);
> - dev_dbg(mmc_dev(host->mmc), "mmc_fclk: disabled\n");
> + pm_runtime_mark_last_busy(host->dev);
> + pm_runtime_put_autosuspend(host->dev);
> +
> return 0;
> }
>
> static const struct mmc_host_ops omap_hsmmc_ops = {
> - .enable = omap_hsmmc_enable_fclk,
> - .disable = omap_hsmmc_disable_fclk,
> + .enable = omap_hsmmc_enable,
> + .disable = omap_hsmmc_disable,
> .request = omap_hsmmc_request,
> .set_ios = omap_hsmmc_set_ios,
> .get_cd = omap_hsmmc_get_cd,
> @@ -1740,10 +1735,7 @@ static int omap_hsmmc_regs_show(struct seq_file *s,
> void *data)
> return 0;
> }
>
> - if (clk_enable(host->fclk) != 0) {
> - seq_printf(s, "can't read the regs\n");
> - return 0;
> - }
> + pm_runtime_get_sync(host->dev);
>
> seq_printf(s, "SYSCONFIG:\t0x%08x\n",
> OMAP_HSMMC_READ(host->base, SYSCONFIG));
> @@ -1760,7 +1752,8 @@ static int omap_hsmmc_regs_show(struct seq_file *s,
> void *data)
> seq_printf(s, "CAPA:\t\t0x%08x\n",
> OMAP_HSMMC_READ(host->base, CAPA));
>
> - clk_disable(host->fclk);
> + pm_runtime_mark_last_busy(host->dev);
> + pm_runtime_put_autosuspend(host->dev);
>
> return 0;
> }
> @@ -1880,18 +1873,12 @@ static int __init omap_hsmmc_probe(struct
> platform_device *pdev)
>
> mmc->caps |= MMC_CAP_DISABLE;
>
> - if (clk_enable(host->iclk) != 0) {
> - clk_put(host->iclk);
> - clk_put(host->fclk);
> - goto err1;
> - }
> -
> - if (mmc_host_enable(host->mmc) != 0) {
> - clk_disable(host->iclk);
> - clk_put(host->iclk);
> - clk_put(host->fclk);
> - goto err1;
> - }
> + pm_runtime_enable(host->dev);
> + pm_runtime_allow(host->dev);
> + pm_runtime_get_sync(host->dev);
> + pm_runtime_set_autosuspend_delay(host->dev, MMC_AUTOSUSPEND_DELAY);
> + pm_runtime_use_autosuspend(host->dev);
> + pm_suspend_ignore_children(host->dev, 1);
Why is ignore_children needed for this device? Is this device the
parent of other devices? If it is, why should it ignore it's
children?
> if (cpu_is_omap2430()) {
> host->dbclk = clk_get(&pdev->dev, "mmchsdb_fck");
> @@ -2018,6 +2005,8 @@ static int __init omap_hsmmc_probe(struct
> platform_device *pdev)
> }
>
> omap_hsmmc_debugfs(mmc);
> + pm_runtime_mark_last_busy(host->dev);
> + pm_runtime_put_autosuspend(host->dev);
>
> return 0;
>
> @@ -2033,8 +2022,8 @@ err_reg:
> err_irq_cd_init:
> free_irq(host->irq, host);
> err_irq:
> - mmc_host_disable(host->mmc);
> - clk_disable(host->iclk);
> + pm_runtime_mark_last_busy(host->dev);
> + pm_runtime_put_autosuspend(host->dev);
> clk_put(host->fclk);
> clk_put(host->iclk);
> if (host->got_dbclk) {
> @@ -2058,7 +2047,7 @@ static int omap_hsmmc_remove(struct platform_device
> *pdev)
> struct resource *res;
>
> if (host) {
> - mmc_host_enable(host->mmc);
> + pm_runtime_get_sync(host->dev);
> mmc_remove_host(host->mmc);
> if (host->use_reg)
> omap_hsmmc_reg_put(host);
> @@ -2069,8 +2058,9 @@ static int omap_hsmmc_remove(struct platform_device
> *pdev)
> free_irq(mmc_slot(host).card_detect_irq, host);
> flush_work_sync(&host->mmc_carddetect_work);
>
> - mmc_host_disable(host->mmc);
> - clk_disable(host->iclk);
> + pm_runtime_put_sync(host->dev);
> + pm_runtime_forbid(host->dev);
Why?
> + pm_runtime_disable(host->dev);
> clk_put(host->fclk);
> clk_put(host->iclk);
> if (host->got_dbclk) {
> @@ -2102,6 +2092,8 @@ static int omap_hsmmc_suspend(struct device *dev)
> return 0;
>
> if (host) {
> + /* FIXME: TODO move get_sync to proper dev_pm_ops function */
what does this mean?
> + pm_runtime_get_sync(host->dev);
> host->suspended = 1;
> if (host->pdata->suspend) {
> ret = host->pdata->suspend(&pdev->dev,
> @@ -2116,13 +2108,11 @@ static int omap_hsmmc_suspend(struct device *dev)
> }
> cancel_work_sync(&host->mmc_carddetect_work);
> ret = mmc_suspend_host(host->mmc);
> - mmc_host_enable(host->mmc);
> +
> if (ret == 0) {
> omap_hsmmc_disable_irq(host);
> OMAP_HSMMC_WRITE(host->base, HCTL,
> OMAP_HSMMC_READ(host->base, HCTL) & ~SDBP);
> - mmc_host_disable(host->mmc);
> - clk_disable(host->iclk);
> if (host->got_dbclk)
> clk_disable(host->dbclk);
> } else {
> @@ -2134,8 +2124,9 @@ static int omap_hsmmc_suspend(struct device *dev)
> dev_dbg(mmc_dev(host->mmc),
> "Unmask interrupt failed\n");
> }
> - mmc_host_disable(host->mmc);
> }
> + /* FIXME: TODO move put_sync to proper dev_pm_ops function */
ditto
> + pm_runtime_put_sync(host->dev);
>
> }
> return ret;
> @@ -2152,14 +2143,8 @@ static int omap_hsmmc_resume(struct device *dev)
> return 0;
>
> if (host) {
> - ret = clk_enable(host->iclk);
> - if (ret)
> - goto clk_en_err;
> -
> - if (mmc_host_enable(host->mmc) != 0) {
> - clk_disable(host->iclk);
> - goto clk_en_err;
> - }
> + /* FIXME: TODO move put_sync to proper dev_pm_ops function */
comment says put_sync, code says get_sync, but again, comment doesn't
make any sense.
> + pm_runtime_get_sync(host->dev);
>
> if (host->got_dbclk)
> clk_enable(host->dbclk);
> @@ -2179,14 +2164,14 @@ static int omap_hsmmc_resume(struct device *dev)
> ret = mmc_resume_host(host->mmc);
> if (ret == 0)
> host->suspended = 0;
> +
> + /* FIXME: TODO move put_sync to proper dev_pm_ops function */
> + pm_runtime_mark_last_busy(host->dev);
> + pm_runtime_put_autosuspend(host->dev);
> }
>
> return ret;
>
> -clk_en_err:
> - dev_dbg(mmc_dev(host->mmc),
> - "Failed to enable MMC clocks during resume\n");
> - return ret;
> }
>
> #else
> @@ -2194,9 +2179,35 @@ clk_en_err:
> #define omap_hsmmc_resume NULL
> #endif
>
> +static int omap_hsmmc_runtime_suspend(struct device *dev)
> +{
> + struct omap_hsmmc_host *host;
> +
> +
extra blank line
> + host = platform_get_drvdata(to_platform_device(dev));
> + omap_hsmmc_context_save(host);
> + dev_dbg(mmc_dev(host->mmc), "disabled\n");
> +
> + return 0;
> +}
> +
> +static int omap_hsmmc_runtime_resume(struct device *dev)
> +{
> + struct omap_hsmmc_host *host;
> +
> +
extra blank line
> + host = platform_get_drvdata(to_platform_device(dev));
> + omap_hsmmc_context_restore(host);
> + dev_dbg(mmc_dev(host->mmc), "host: enabled\n");
> +
> + return 0;
> +}
> +
> static struct dev_pm_ops omap_hsmmc_dev_pm_ops = {
> .suspend = omap_hsmmc_suspend,
> .resume = omap_hsmmc_resume,
> + .runtime_suspend = omap_hsmmc_runtime_suspend,
> + .runtime_resume = omap_hsmmc_runtime_resume,
> };
>
> static struct platform_driver omap_hsmmc_driver = {
Kevin
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