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mmc: rtsx_usb_sdmmc: Re-work card detection/removal support 

The rtsx USB parent device, has logic to detect when a card is inserted
into the card slot. Although, the logic can't detect when a card is
removed. This makes things a bit tricky, which is why the current method is
simply to turn on MMC_CAP_NEEDS_POLL during probe.

Using MMC_CAP_NEEDS_POLL means lots of energy being wasted, as the mmc host
becomes runtime resumed frequently by the mmc core, while it polls for new
cards being inserted.

To address this problem, let's start relying on that the rtsx USB driver
runtime resumes its child device, which is the rtsx_usb_sdmmc device, when
it detects that a new card being inserted.

This means dropping MMC_CAP_NEEDS_POLL from being set during probe. Instead
let's implement a ->runtime_resume() callback to schedule a detect work and
to set MMC_CAP_NEEDS_POLL. In this way, polling is enabled as long as there
is card inserted, thus we can rely on the mmc core to detect also when the
card becomes removed.

Furthermore, to avoid polling forever after a card has been removed, let's
implement a ->runtime_suspend() callback and make it clear
MMC_CAP_NEEDS_POLL.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
This commit is contained in:
Ulf Hansson 2018-06-04 08:30:24 +02:00
parent f275179f7b
commit 4dad599b8b
1 changed files with 28 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
drivers/mmc/host/rtsx_usb_sdmmc.c
View File

@ -28,6 +28,7 @@
#include <linux/mmc/sd.h>
#include <linux/mmc/card.h>
#include <linux/scatterlist.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/rtsx_usb.h>
@ -1324,7 +1325,7 @@ static void rtsx_usb_init_host(struct rtsx_usb_sdmmc *host)
mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SD_HIGHSPEED |
MMC_CAP_MMC_HIGHSPEED | MMC_CAP_BUS_WIDTH_TEST |
MMC_CAP_UHS_SDR12 | MMC_CAP_UHS_SDR25 | MMC_CAP_UHS_SDR50 |
MMC_CAP_NEEDS_POLL | MMC_CAP_ERASE | MMC_CAP_SYNC_RUNTIME_PM;
MMC_CAP_ERASE | MMC_CAP_SYNC_RUNTIME_PM;
mmc->caps2 = MMC_CAP2_NO_PRESCAN_POWERUP | MMC_CAP2_FULL_PWR_CYCLE |
MMC_CAP2_NO_SDIO;
@ -1429,6 +1430,31 @@ static int rtsx_usb_sdmmc_drv_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM
static int rtsx_usb_sdmmc_runtime_suspend(struct device *dev)
{
struct rtsx_usb_sdmmc *host = dev_get_drvdata(dev);
host->mmc->caps &= ~MMC_CAP_NEEDS_POLL;
return 0;
}
static int rtsx_usb_sdmmc_runtime_resume(struct device *dev)
{
struct rtsx_usb_sdmmc *host = dev_get_drvdata(dev);
host->mmc->caps |= MMC_CAP_NEEDS_POLL;
if (sdmmc_get_cd(host->mmc) == 1)
mmc_detect_change(host->mmc, 0);
return 0;
}
#endif
static const struct dev_pm_ops rtsx_usb_sdmmc_dev_pm_ops = {
SET_RUNTIME_PM_OPS(rtsx_usb_sdmmc_runtime_suspend,
rtsx_usb_sdmmc_runtime_resume, NULL)
};
static const struct platform_device_id rtsx_usb_sdmmc_ids[] = {
{
.name = "rtsx_usb_sdmmc",
@ -1444,6 +1470,7 @@ static struct platform_driver rtsx_usb_sdmmc_driver = {
.id_table = rtsx_usb_sdmmc_ids,
.driver = {
.name = "rtsx_usb_sdmmc",
.pm = &rtsx_usb_sdmmc_dev_pm_ops,
},
};
module_platform_driver(rtsx_usb_sdmmc_driver);