[PATCH V2 1/1] mmc: start removing enable / disable API
Subhash Jadavani
subhashj at codeaurora.org
Thu Mar 1 03:08:51 EST 2012
On 2/29/2012 12:47 PM, Adrian Hunter wrote:
> Most parts of the enable / disable API are no longer used and
> can be removed.
>
> Cc: Rajendra Nayak<rnayak at ti.com>
> Cc: Venkatraman S<svenkatr at ti.com>
> Cc: Kukjin Kim<kgene.kim at samsung.com>
> Cc: Thomas Abraham<thomas.abraham at linaro.org>
> Cc: Kyungmin Park<kyungmin.park at samsung.com>
> Cc: Sekhar Nori<nsekhar at ti.com>
> Cc: Kevin Hilman<khilman at ti.com>
> Signed-off-by: Adrian Hunter<adrian.hunter at intel.com>
> ---
> arch/arm/mach-exynos/mach-nuri.c | 5 +-
> arch/arm/mach-exynos/mach-universal_c210.c | 9 +-
> drivers/mmc/core/core.c | 187 +++-------------------------
> drivers/mmc/core/host.c | 1 -
> drivers/mmc/core/host.h | 1 -
> drivers/mmc/host/davinci_mmc.c | 4 -
> drivers/mmc/host/omap_hsmmc.c | 15 +--
> include/linux/mmc/core.h | 1 -
> include/linux/mmc/host.h | 46 +------
> 9 files changed, 27 insertions(+), 242 deletions(-)
>
> diff --git a/arch/arm/mach-exynos/mach-nuri.c b/arch/arm/mach-exynos/mach-nuri.c
> index 644af11..de68248 100644
> --- a/arch/arm/mach-exynos/mach-nuri.c
> +++ b/arch/arm/mach-exynos/mach-nuri.c
> @@ -109,7 +109,7 @@ static struct s3c_sdhci_platdata nuri_hsmmc0_data __initdata = {
> .max_width = 8,
> .host_caps = (MMC_CAP_8_BIT_DATA | MMC_CAP_4_BIT_DATA |
> MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
> - MMC_CAP_DISABLE | MMC_CAP_ERASE),
> + MMC_CAP_ERASE),
> .cd_type = S3C_SDHCI_CD_PERMANENT,
> };
>
> @@ -147,8 +147,7 @@ static struct platform_device emmc_fixed_voltage = {
> static struct s3c_sdhci_platdata nuri_hsmmc2_data __initdata = {
> .max_width = 4,
> .host_caps = MMC_CAP_4_BIT_DATA |
> - MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
> - MMC_CAP_DISABLE,
> + MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED,
> .ext_cd_gpio = EXYNOS4_GPX3(3), /* XEINT_27 */
> .ext_cd_gpio_invert = 1,
> .cd_type = S3C_SDHCI_CD_GPIO,
> diff --git a/arch/arm/mach-exynos/mach-universal_c210.c b/arch/arm/mach-exynos/mach-universal_c210.c
> index 9b3fbae..57cfe61 100644
> --- a/arch/arm/mach-exynos/mach-universal_c210.c
> +++ b/arch/arm/mach-exynos/mach-universal_c210.c
> @@ -734,8 +734,7 @@ static struct platform_device universal_gpio_keys = {
> static struct s3c_sdhci_platdata universal_hsmmc0_data __initdata = {
> .max_width = 8,
> .host_caps = (MMC_CAP_8_BIT_DATA | MMC_CAP_4_BIT_DATA |
> - MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
> - MMC_CAP_DISABLE),
> + MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED),
> .cd_type = S3C_SDHCI_CD_PERMANENT,
> };
>
> @@ -772,8 +771,7 @@ static struct platform_device mmc0_fixed_voltage = {
> static struct s3c_sdhci_platdata universal_hsmmc2_data __initdata = {
> .max_width = 4,
> .host_caps = MMC_CAP_4_BIT_DATA |
> - MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
> - MMC_CAP_DISABLE,
> + MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED,
> .ext_cd_gpio = EXYNOS4_GPX3(4), /* XEINT_28 */
> .ext_cd_gpio_invert = 1,
> .cd_type = S3C_SDHCI_CD_GPIO,
> @@ -783,8 +781,7 @@ static struct s3c_sdhci_platdata universal_hsmmc2_data __initdata = {
> static struct s3c_sdhci_platdata universal_hsmmc3_data __initdata = {
> .max_width = 4,
> .host_caps = MMC_CAP_4_BIT_DATA |
> - MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
> - MMC_CAP_DISABLE,
> + MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED,
> .cd_type = S3C_SDHCI_CD_EXTERNAL,
> };
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index 0b317f0..44dd013 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -605,105 +605,6 @@ unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
> EXPORT_SYMBOL(mmc_align_data_size);
>
> /**
> - * mmc_host_enable - enable a host.
> - * @host: mmc host to enable
> - *
> - * Hosts that support power saving can use the 'enable' and 'disable'
> - * methods to exit and enter power saving states. For more information
> - * see comments for struct mmc_host_ops.
> - */
> -int mmc_host_enable(struct mmc_host *host)
> -{
> - if (!(host->caps& MMC_CAP_DISABLE))
> - return 0;
> -
> - if (host->en_dis_recurs)
> - return 0;
> -
> - if (host->nesting_cnt++)
> - return 0;
> -
> - cancel_delayed_work_sync(&host->disable);
> -
> - if (host->enabled)
> - return 0;
> -
> - if (host->ops->enable) {
> - int err;
> -
> - host->en_dis_recurs = 1;
> - mmc_host_clk_hold(host);
> - err = host->ops->enable(host);
> - mmc_host_clk_release(host);
> - host->en_dis_recurs = 0;
> -
> - if (err) {
> - pr_debug("%s: enable error %d\n",
> - mmc_hostname(host), err);
> - return err;
> - }
> - }
> - host->enabled = 1;
> - return 0;
> -}
> -EXPORT_SYMBOL(mmc_host_enable);
> -
> -static int mmc_host_do_disable(struct mmc_host *host, int lazy)
> -{
> - if (host->ops->disable) {
> - int err;
> -
> - host->en_dis_recurs = 1;
> - mmc_host_clk_hold(host);
> - err = host->ops->disable(host, lazy);
> - mmc_host_clk_release(host);
> - host->en_dis_recurs = 0;
> -
> - if (err< 0) {
> - pr_debug("%s: disable error %d\n",
> - mmc_hostname(host), err);
> - return err;
> - }
> - if (err> 0) {
> - unsigned long delay = msecs_to_jiffies(err);
> -
> - mmc_schedule_delayed_work(&host->disable, delay);
> - }
> - }
> - host->enabled = 0;
> - return 0;
> -}
> -
> -/**
> - * mmc_host_disable - disable a host.
> - * @host: mmc host to disable
> - *
> - * Hosts that support power saving can use the 'enable' and 'disable'
> - * methods to exit and enter power saving states. For more information
> - * see comments for struct mmc_host_ops.
> - */
> -int mmc_host_disable(struct mmc_host *host)
> -{
> - int err;
> -
> - if (!(host->caps& MMC_CAP_DISABLE))
> - return 0;
> -
> - if (host->en_dis_recurs)
> - return 0;
> -
> - if (--host->nesting_cnt)
> - return 0;
> -
> - if (!host->enabled)
> - return 0;
> -
> - err = mmc_host_do_disable(host, 0);
> - return err;
> -}
> -EXPORT_SYMBOL(mmc_host_disable);
> -
> -/**
> * __mmc_claim_host - exclusively claim a host
> * @host: mmc host to claim
> * @abort: whether or not the operation should be aborted
> @@ -741,8 +642,8 @@ int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
> wake_up(&host->wq);
> spin_unlock_irqrestore(&host->lock, flags);
> remove_wait_queue(&host->wq,&wait);
> - if (!stop)
> - mmc_host_enable(host);
> + if (host->ops->enable&& !stop&& host->claim_cnt == 1)
Shouldn't we still make sure that clocks are hold (by calling
mmc_host_clk_hold() ) before calling enable?
> + host->ops->enable(host);
> return stop;
> }
>
> @@ -767,21 +668,28 @@ int mmc_try_claim_host(struct mmc_host *host)
> claimed_host = 1;
> }
> spin_unlock_irqrestore(&host->lock, flags);
> + if (host->ops->enable&& claimed_host&& host->claim_cnt == 1)
mmc_host_clk_hold() ?
> + host->ops->enable(host);
> return claimed_host;
> }
> EXPORT_SYMBOL(mmc_try_claim_host);
>
> /**
> - * mmc_do_release_host - release a claimed host
> + * mmc_release_host - release a host
> * @host: mmc host to release
> *
> - * If you successfully claimed a host, this function will
> - * release it again.
> + * Release a MMC host, allowing others to claim the host
> + * for their operations.
> */
> -void mmc_do_release_host(struct mmc_host *host)
> +void mmc_release_host(struct mmc_host *host)
> {
> unsigned long flags;
>
> + WARN_ON(!host->claimed);
> +
> + if (host->ops->disable&& host->claim_cnt == 1)
mmc_host_clk_hold ??
> + host->ops->disable(host);
> +
> spin_lock_irqsave(&host->lock, flags);
> if (--host->claim_cnt) {
> /* Release for nested claim */
> @@ -793,67 +701,6 @@ void mmc_do_release_host(struct mmc_host *host)
> wake_up(&host->wq);
> }
> }
> -EXPORT_SYMBOL(mmc_do_release_host);
> -
> -void mmc_host_deeper_disable(struct work_struct *work)
> -{
> - struct mmc_host *host =
> - container_of(work, struct mmc_host, disable.work);
> -
> - /* If the host is claimed then we do not want to disable it anymore */
> - if (!mmc_try_claim_host(host))
> - return;
> - mmc_host_do_disable(host, 1);
> - mmc_do_release_host(host);
> -}
> -
> -/**
> - * mmc_host_lazy_disable - lazily disable a host.
> - * @host: mmc host to disable
> - *
> - * Hosts that support power saving can use the 'enable' and 'disable'
> - * methods to exit and enter power saving states. For more information
> - * see comments for struct mmc_host_ops.
> - */
> -int mmc_host_lazy_disable(struct mmc_host *host)
> -{
> - if (!(host->caps& MMC_CAP_DISABLE))
> - return 0;
> -
> - if (host->en_dis_recurs)
> - return 0;
> -
> - if (--host->nesting_cnt)
> - return 0;
> -
> - if (!host->enabled)
> - return 0;
> -
> - if (host->disable_delay) {
> - mmc_schedule_delayed_work(&host->disable,
> - msecs_to_jiffies(host->disable_delay));
> - return 0;
> - } else
> - return mmc_host_do_disable(host, 1);
> -}
> -EXPORT_SYMBOL(mmc_host_lazy_disable);
> -
> -/**
> - * mmc_release_host - release a host
> - * @host: mmc host to release
> - *
> - * Release a MMC host, allowing others to claim the host
> - * for their operations.
> - */
> -void mmc_release_host(struct mmc_host *host)
> -{
> - WARN_ON(!host->claimed);
> -
> - mmc_host_lazy_disable(host);
> -
> - mmc_do_release_host(host);
> -}
> -
> EXPORT_SYMBOL(mmc_release_host);
>
> /*
> @@ -2206,8 +2053,6 @@ void mmc_stop_host(struct mmc_host *host)
> spin_unlock_irqrestore(&host->lock, flags);
> #endif
>
> - if (host->caps& MMC_CAP_DISABLE)
> - cancel_delayed_work(&host->disable);
> cancel_delayed_work_sync(&host->detect);
> mmc_flush_scheduled_work();
>
> @@ -2402,13 +2247,11 @@ int mmc_suspend_host(struct mmc_host *host)
> {
> int err = 0;
>
> - if (host->caps& MMC_CAP_DISABLE)
> - cancel_delayed_work(&host->disable);
> cancel_delayed_work(&host->detect);
> mmc_flush_scheduled_work();
> if (mmc_try_claim_host(host)) {
> err = mmc_cache_ctrl(host, 0);
> - mmc_do_release_host(host);
> + mmc_release_host(host);
> } else {
> err = -EBUSY;
> }
> @@ -2429,7 +2272,7 @@ int mmc_suspend_host(struct mmc_host *host)
> if (host->bus_ops->suspend) {
> err = host->bus_ops->suspend(host);
> }
> - mmc_do_release_host(host);
> + mmc_release_host(host);
>
> if (err == -ENOSYS || !host->bus_ops->resume) {
> /*
> diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
> index c3704e2..91c84c7 100644
> --- a/drivers/mmc/core/host.c
> +++ b/drivers/mmc/core/host.c
> @@ -330,7 +330,6 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
> spin_lock_init(&host->lock);
> init_waitqueue_head(&host->wq);
> INIT_DELAYED_WORK(&host->detect, mmc_rescan);
> - INIT_DELAYED_WORK_DEFERRABLE(&host->disable, mmc_host_deeper_disable);
> #ifdef CONFIG_PM
> host->pm_notify.notifier_call = mmc_pm_notify;
> #endif
> diff --git a/drivers/mmc/core/host.h b/drivers/mmc/core/host.h
> index 08a7852..f2ab9e5 100644
> --- a/drivers/mmc/core/host.h
> +++ b/drivers/mmc/core/host.h
> @@ -14,7 +14,6 @@
>
> int mmc_register_host_class(void);
> void mmc_unregister_host_class(void);
> -void mmc_host_deeper_disable(struct work_struct *work);
>
> #endif
>
> diff --git a/drivers/mmc/host/davinci_mmc.c b/drivers/mmc/host/davinci_mmc.c
> index 64a8325..8de9c9b 100644
> --- a/drivers/mmc/host/davinci_mmc.c
> +++ b/drivers/mmc/host/davinci_mmc.c
> @@ -1418,17 +1418,14 @@ static int davinci_mmcsd_suspend(struct device *dev)
> struct mmc_davinci_host *host = platform_get_drvdata(pdev);
> int ret;
>
> - mmc_host_enable(host->mmc);
> ret = mmc_suspend_host(host->mmc);
> if (!ret) {
> writel(0, host->base + DAVINCI_MMCIM);
> mmc_davinci_reset_ctrl(host, 1);
> - mmc_host_disable(host->mmc);
> clk_disable(host->clk);
> host->suspended = 1;
> } else {
> host->suspended = 0;
> - mmc_host_disable(host->mmc);
> }
>
> return ret;
> @@ -1444,7 +1441,6 @@ static int davinci_mmcsd_resume(struct device *dev)
> return 0;
>
> clk_enable(host->clk);
> - mmc_host_enable(host->mmc);
>
> mmc_davinci_reset_ctrl(host, 0);
> ret = mmc_resume_host(host->mmc);
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index 36e7f5b..fdb24cf 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -179,7 +179,6 @@ struct omap_hsmmc_host {
> int got_dbclk;
> int response_busy;
> int context_loss;
> - int dpm_state;
> int vdd;
> int protect_card;
> int reqs_blocked;
> @@ -1748,7 +1747,7 @@ static int omap_hsmmc_enable_fclk(struct mmc_host *mmc)
> return 0;
> }
>
> -static int omap_hsmmc_disable_fclk(struct mmc_host *mmc, int lazy)
> +static int omap_hsmmc_disable_fclk(struct mmc_host *mmc)
> {
> struct omap_hsmmc_host *host = mmc_priv(mmc);
>
> @@ -1782,15 +1781,8 @@ static int omap_hsmmc_regs_show(struct seq_file *s, void *data)
> if (host->pdata->get_context_loss_count)
> context_loss = host->pdata->get_context_loss_count(host->dev);
>
> - seq_printf(s, "mmc%d:\n"
> - " enabled:\t%d\n"
> - " dpm_state:\t%d\n"
> - " nesting_cnt:\t%d\n"
> - " ctx_loss:\t%d:%d\n"
> - "\nregs:\n",
> - mmc->index, mmc->enabled ? 1 : 0,
> - host->dpm_state, mmc->nesting_cnt,
> - host->context_loss, context_loss);
> + seq_printf(s, "mmc%d:\n ctx_loss:\t%d:%d\n\nregs:\n",
> + mmc->index, host->context_loss, context_loss);
>
> if (host->suspended) {
> seq_printf(s, "host suspended, can't read registers\n");
> @@ -1930,7 +1922,6 @@ static int __init omap_hsmmc_probe(struct platform_device *pdev)
>
> omap_hsmmc_context_save(host);
>
> - mmc->caps |= MMC_CAP_DISABLE;
> if (host->pdata->controller_flags& OMAP_HSMMC_BROKEN_MULTIBLOCK_READ) {
> dev_info(&pdev->dev, "multiblock reads disabled due to 35xx erratum 2.1.1.128; MMC read performance may suffer\n");
> mmc->caps2 |= MMC_CAP2_NO_MULTI_READ;
> diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
> index 87a976c..2bfa589 100644
> --- a/include/linux/mmc/core.h
> +++ b/include/linux/mmc/core.h
> @@ -175,7 +175,6 @@ extern unsigned int mmc_align_data_size(struct mmc_card *, unsigned int);
>
> extern int __mmc_claim_host(struct mmc_host *host, atomic_t *abort);
> extern void mmc_release_host(struct mmc_host *host);
> -extern void mmc_do_release_host(struct mmc_host *host);
> extern int mmc_try_claim_host(struct mmc_host *host);
>
> extern int mmc_flush_cache(struct mmc_card *);
> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> index 37147a4..4da98f7 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -80,34 +80,11 @@ struct mmc_ios {
>
> struct mmc_host_ops {
> /*
> - * Hosts that support power saving can use the 'enable' and 'disable'
> - * methods to exit and enter power saving states. 'enable' is called
> - * when the host is claimed and 'disable' is called (or scheduled with
> - * a delay) when the host is released. The 'disable' is scheduled if
> - * the disable delay set by 'mmc_set_disable_delay()' is non-zero,
> - * otherwise 'disable' is called immediately. 'disable' may be
> - * scheduled repeatedly, to permit ever greater power saving at the
> - * expense of ever greater latency to re-enable. Rescheduling is
> - * determined by the return value of the 'disable' method. A positive
> - * value gives the delay in milliseconds.
> - *
> - * In the case where a host function (like set_ios) may be called
> - * with or without the host claimed, enabling and disabling can be
> - * done directly and will nest correctly. Call 'mmc_host_enable()' and
> - * 'mmc_host_lazy_disable()' for this purpose, but note that these
> - * functions must be paired.
> - *
> - * Alternatively, 'mmc_host_enable()' may be paired with
> - * 'mmc_host_disable()' which calls 'disable' immediately. In this
> - * case the 'disable' method will be called with 'lazy' set to 0.
> - * This is mainly useful for error paths.
> - *
> - * Because lazy disable may be called from a work queue, the 'disable'
> - * method must claim the host when 'lazy' != 0, which will work
> - * correctly because recursion is detected and handled.
> + * 'enable' is called when the host is claimed and 'disable' is called
> + * when the host is released. 'enable' and 'disable' are deprecated.
> */
> int (*enable)(struct mmc_host *host);
> - int (*disable)(struct mmc_host *host, int lazy);
> + int (*disable)(struct mmc_host *host);
> /*
> * It is optional for the host to implement pre_req and post_req in
> * order to support double buffering of requests (prepare one
> @@ -218,7 +195,7 @@ struct mmc_host {
> #define MMC_CAP_SPI (1<< 4) /* Talks only SPI protocols */
> #define MMC_CAP_NEEDS_POLL (1<< 5) /* Needs polling for card-detection */
> #define MMC_CAP_8_BIT_DATA (1<< 6) /* Can the host do 8 bit transfers */
> -#define MMC_CAP_DISABLE (1<< 7) /* Can the host be disabled */
> +
> #define MMC_CAP_NONREMOVABLE (1<< 8) /* Nonremovable e.g. eMMC */
> #define MMC_CAP_WAIT_WHILE_BUSY (1<< 9) /* Waits while card is busy */
> #define MMC_CAP_ERASE (1<< 10) /* Allow erase/trim commands */
> @@ -301,13 +278,7 @@ struct mmc_host {
> unsigned int removed:1; /* host is being removed */
> #endif
>
> - /* Only used with MMC_CAP_DISABLE */
> - int enabled; /* host is enabled */
> int rescan_disable; /* disable card detection */
> - int nesting_cnt; /* "enable" nesting count */
> - int en_dis_recurs; /* detect recursion */
> - unsigned int disable_delay; /* disable delay in msecs */
> - struct delayed_work disable; /* disabling work */
>
> struct mmc_card *card; /* device attached to this host */
>
> @@ -407,17 +378,8 @@ int mmc_card_awake(struct mmc_host *host);
> int mmc_card_sleep(struct mmc_host *host);
> int mmc_card_can_sleep(struct mmc_host *host);
>
> -int mmc_host_enable(struct mmc_host *host);
> -int mmc_host_disable(struct mmc_host *host);
> -int mmc_host_lazy_disable(struct mmc_host *host);
> int mmc_pm_notify(struct notifier_block *notify_block, unsigned long, void *);
>
> -static inline void mmc_set_disable_delay(struct mmc_host *host,
> - unsigned int disable_delay)
> -{
> - host->disable_delay = disable_delay;
> -}
> -
> /* Module parameter */
> extern bool mmc_assume_removable;
>
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