diff options
author | Ulf Hansson <ulf.hansson@linaro.org> | 2013-10-24 15:53:15 (GMT) |
---|---|---|
committer | Ulf Hansson <ulf.hansson@linaro.org> | 2014-09-09 11:59:09 (GMT) |
commit | 3b292bb0e99018c448e0f5a26c29c68113a1b7bf (patch) | |
tree | 844ec57428babaabd682421f042c2c4054b94dcf /drivers/mmc | |
parent | 9ae4ed7d30f433873351d5ba14ae000d10e10430 (diff) | |
download | linux-3b292bb0e99018c448e0f5a26c29c68113a1b7bf.tar.xz |
mmc: tmio: Restructure ->set_ios() and adapt ->probe() to it
An internal power state machine were beeing used to keep ->probe() and
->set_ios() in sync. Especially for handling specific scenarios while
using CONFIG_MMC_CLKGATE. Moreover dependency to CONFIG_MMC_CLKGATE
existed to handle runtime PM properly, which we moves away from here.
By removing the state machine and instead make ->set_ios() rely on the
information provided through the function's in-parameters, the code
becomes significantly simplier.
Additonally as a part of this rework we prepares for making the runtime
PM callbacks responsible of clock gating.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Diffstat (limited to 'drivers/mmc')
-rw-r--r-- | drivers/mmc/host/tmio_mmc.h | 20 | ||||
-rw-r--r-- | drivers/mmc/host/tmio_mmc_pio.c | 61 |
2 files changed, 14 insertions, 67 deletions
diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h index d6ceb1a..f837723 100644 --- a/drivers/mmc/host/tmio_mmc.h +++ b/drivers/mmc/host/tmio_mmc.h @@ -40,22 +40,6 @@ struct tmio_mmc_data; -/* - * We differentiate between the following 3 power states: - * 1. card slot powered off, controller stopped. This is used, when either there - * is no card in the slot, or the card really has to be powered down. - * 2. card slot powered on, controller stopped. This is used, when a card is in - * the slot, but no activity is currently taking place. This is a power- - * saving mode with card-state preserved. This state can be entered, e.g. - * when MMC clock-gating is used. - * 3. card slot powered on, controller running. This is the actual active state. - */ -enum tmio_mmc_power { - TMIO_MMC_OFF_STOP, /* card power off, controller stopped */ - TMIO_MMC_ON_STOP, /* card power on, controller stopped */ - TMIO_MMC_ON_RUN, /* card power on, controller running */ -}; - struct tmio_mmc_host { void __iomem *ctl; struct mmc_command *cmd; @@ -63,9 +47,6 @@ struct tmio_mmc_host { struct mmc_data *data; struct mmc_host *mmc; - /* Controller and card power state */ - enum tmio_mmc_power power; - /* Callbacks for clock / power control */ void (*set_pwr)(struct platform_device *host, int state); void (*set_clk_div)(struct platform_device *host, int state); @@ -100,7 +81,6 @@ struct tmio_mmc_host { unsigned long last_req_ts; struct mutex ios_lock; /* protect set_ios() context */ bool native_hotplug; - bool resuming; bool sdio_irq_enabled; }; diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c index 8f5b5cc..e573a15 100644 --- a/drivers/mmc/host/tmio_mmc_pio.c +++ b/drivers/mmc/host/tmio_mmc_pio.c @@ -884,51 +884,23 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) spin_unlock_irqrestore(&host->lock, flags); - /* - * host->power toggles between false and true in both cases - either - * or not the controller can be runtime-suspended during inactivity. - * But if the controller has to be kept on, the runtime-pm usage_count - * is kept positive, so no suspending actually takes place. - */ - if (ios->power_mode == MMC_POWER_ON && ios->clock) { - if (host->power != TMIO_MMC_ON_RUN) { - tmio_mmc_clk_update(mmc); - if (host->resuming) { - tmio_mmc_reset(host); - host->resuming = false; - } - } - if (host->power == TMIO_MMC_OFF_STOP) - tmio_mmc_reset(host); + switch (ios->power_mode) { + case MMC_POWER_OFF: + tmio_mmc_power_off(host); + tmio_mmc_clk_stop(host); + break; + case MMC_POWER_UP: tmio_mmc_set_clock(host, ios->clock); - if (host->power == TMIO_MMC_OFF_STOP) - /* power up SD card and the bus */ - tmio_mmc_power_on(host, ios->vdd); - host->power = TMIO_MMC_ON_RUN; - /* start bus clock */ + tmio_mmc_power_on(host, ios->vdd); tmio_mmc_clk_start(host); - } else if (ios->power_mode != MMC_POWER_UP) { - struct tmio_mmc_data *pdata = host->pdata; - unsigned int old_power = host->power; - - if (old_power != TMIO_MMC_OFF_STOP) { - if (ios->power_mode == MMC_POWER_OFF) { - tmio_mmc_power_off(host); - host->power = TMIO_MMC_OFF_STOP; - } else { - host->power = TMIO_MMC_ON_STOP; - } - } - - if (old_power == TMIO_MMC_ON_RUN) { - tmio_mmc_clk_stop(host); - if (pdata->clk_disable) - pdata->clk_disable(host->pdev); - } - } - - if (host->power != TMIO_MMC_OFF_STOP) tmio_mmc_set_bus_width(host, ios->bus_width); + break; + case MMC_POWER_ON: + tmio_mmc_set_clock(host, ios->clock); + tmio_mmc_clk_start(host); + tmio_mmc_set_bus_width(host, ios->bus_width); + break; + } /* Let things settle. delay taken from winCE driver */ udelay(140); @@ -1064,7 +1036,6 @@ int tmio_mmc_host_probe(struct tmio_mmc_host **host, mmc->caps & MMC_CAP_NONREMOVABLE || mmc->slot.cd_irq >= 0); - _host->power = TMIO_MMC_OFF_STOP; if (tmio_mmc_clk_update(mmc) < 0) { mmc->f_max = pdata->hclk; mmc->f_min = mmc->f_max / 512; @@ -1116,8 +1087,6 @@ int tmio_mmc_host_probe(struct tmio_mmc_host **host, pm_runtime_enable(&pdev->dev); ret = mmc_add_host(mmc); - if (pdata->clk_disable) - pdata->clk_disable(pdev); if (ret < 0) { tmio_mmc_host_remove(_host); return ret; @@ -1185,8 +1154,6 @@ int tmio_mmc_host_resume(struct device *dev) tmio_mmc_enable_dma(host, true); - /* The MMC core will perform the complete set up */ - host->resuming = true; return 0; } EXPORT_SYMBOL(tmio_mmc_host_resume); |