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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>
This commit is contained in:
Bastian Hecht 2011-12-23 23:03:13 +01:00 committed by Chris Ball
parent 913047e9e5
commit cbb18b309d
1 changed files with 21 additions and 9 deletions
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30
drivers/mmc/host/tmio_mmc_pio.c
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@ -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);