diff options
| author | Bastian Hecht <hechtb@googlemail.com> | 2011-12-23 23:03:13 +0100 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2012-01-11 23:58:45 -0500 |
| commit | cbb18b309d3d6b6661f931279697eac77b6591c9 (patch) | |
| tree | 7df65c7d8200b38bef31a3fee09a1af18808f30d /drivers/mmc | |
| parent | 913047e9e5787a90696533a9f109552b7694ecc9 (diff) | |
| download | linux-cbb18b309d3d6b6661f931279697eac77b6591c9.tar.gz linux-cbb18b309d3d6b6661f931279697eac77b6591c9.tar.bz2 linux-cbb18b309d3d6b6661f931279697eac77b6591c9.zip | |
mmc: tmio_mmc: Hotplug code regrouping
This patch regroups the code slightly, adds documentation and allows
the rtpm counter of MMC_CAP_NEEDS_POLL devices to reach 0 again.
Signed-off-by: Bastian Hecht <hechtb@gmail.com>
[g.liakhovetski@gmx.de: restore pm_runtime_get_noresume()]
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/tmio_mmc_pio.c | 30 |
1 files changed, 21 insertions, 9 deletions
diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c index 4208b3958069..abad01b37cfb 100644 --- a/drivers/mmc/host/tmio_mmc_pio.c +++ b/drivers/mmc/host/tmio_mmc_pio.c @@ -800,8 +800,7 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) } else if (ios->power_mode != MMC_POWER_UP) { if (host->set_pwr && ios->power_mode == MMC_POWER_OFF) host->set_pwr(host->pdev, 0); - if ((pdata->flags & TMIO_MMC_HAS_COLD_CD) && - pdata->power) { + if (pdata->power) { pdata->power = false; pm_runtime_put(&host->pdev->dev); } @@ -915,6 +914,23 @@ int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host, if (ret < 0) goto pm_disable; + /* + * There are 4 different scenarios for the card detection: + * 1) an external gpio irq handles the cd (best for power savings) + * 2) internal sdhi irq handles the cd + * 3) a worker thread polls the sdhi - indicated by MMC_CAP_NEEDS_POLL + * 4) the medium is non-removable - indicated by MMC_CAP_NONREMOVABLE + * + * While we increment the rtpm counter for all scenarios when the mmc + * core activates us by calling an appropriate set_ios(), we must + * additionally ensure that in case 2) the tmio mmc hardware stays + * powered on during runtime for the card detection to work. + */ + if (!(pdata->flags & TMIO_MMC_HAS_COLD_CD + || mmc->caps & MMC_CAP_NEEDS_POLL + || mmc->caps & MMC_CAP_NONREMOVABLE)) + pm_runtime_get_noresume(&pdev->dev); + tmio_mmc_clk_stop(_host); tmio_mmc_reset(_host); @@ -933,12 +949,6 @@ int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host, /* See if we also get DMA */ tmio_mmc_request_dma(_host, pdata); - /* We have to keep the device powered for its card detection to work */ - if (!(pdata->flags & TMIO_MMC_HAS_COLD_CD)) { - pdata->power = true; - pm_runtime_get_noresume(&pdev->dev); - } - mmc_add_host(mmc); /* Unmask the IRQs we want to know about */ @@ -974,7 +984,9 @@ void tmio_mmc_host_remove(struct tmio_mmc_host *host) * the controller, the runtime PM is suspended and pdata->power == false, * so, our .runtime_resume() will not try to detect a card in the slot. */ - if (host->pdata->flags & TMIO_MMC_HAS_COLD_CD) + if (host->pdata->flags & TMIO_MMC_HAS_COLD_CD + || host->mmc->caps & MMC_CAP_NEEDS_POLL + || host->mmc->caps & MMC_CAP_NONREMOVABLE) pm_runtime_get_sync(&pdev->dev); mmc_remove_host(host->mmc); |