mmc: rtsx_usb_sdmmc: Re-work runtime PM support

The current implementation uses the runtime PM autosuspend feature with a
default timeout set to 50ms. This really doesn't makes sense, as it's a USB
driven host device, which needs it rtsx USB device (parent device) to be
runtime resumed to provide power to the card.

In practise, using the autosuspend or any async runtime PM suspend method,
means unnecessary delaying the host device and thus the parent, to be
runtime suspended when a card is removed/powered off. For this reasons,
let's simply drop the support for runtime PM autosuspend and tell the mmc
core to use synced runtime PM suspend methods, via setting
MMC_CAP_SYNC_RUNTIME_PM during probe.

Moreover, as the mmc core nowadays deploys runtime PM reference counting of
the mmc host device, convert ->set_ios() to use the more lightweight
pm_runtime_get_noresume() and pm_runtime_put_noidle() APIs.

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>

diff --git a/drivers/mmc/host/rtsx_usb_sdmmc.c b/drivers/mmc/host/rtsx_usb_sdmmc.c
index 14b4a4e13fe60a03704149d1aa39c987362061a1..ca0ab8eb30c357d3f49f136832dafff20a36c54e 100644 (file)
--- a/drivers/mmc/host/rtsx_usb_sdmmc.c
+++ b/drivers/mmc/host/rtsx_usb_sdmmc.c
@@ -1042,9 +1042,9 @@ static int sd_set_power_mode(struct rtsx_usb_sdmmc *host,
 
        if (power_mode == MMC_POWER_OFF) {
                err = sd_power_off(host);
-               pm_runtime_put(sdmmc_dev(host));
+               pm_runtime_put_noidle(sdmmc_dev(host));
        } else {
-               pm_runtime_get_sync(sdmmc_dev(host));
+               pm_runtime_get_noresume(sdmmc_dev(host));
                err = sd_power_on(host);
        }
 
@@ -1310,7 +1310,7 @@ static void rtsx_usb_update_led(struct work_struct *work)
 
 out:
        mutex_unlock(&ucr->dev_mutex);
-       pm_runtime_put(sdmmc_dev(host));
+       pm_runtime_put_sync_suspend(sdmmc_dev(host));
 }
 #endif
 
@@ -1324,7 +1324,7 @@ 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_NEEDS_POLL | MMC_CAP_ERASE | MMC_CAP_SYNC_RUNTIME_PM;
        mmc->caps2 = MMC_CAP2_NO_PRESCAN_POWERUP | MMC_CAP2_FULL_PWR_CYCLE |
                MMC_CAP2_NO_SDIO;
 
@@ -1367,8 +1367,6 @@ static int rtsx_usb_sdmmc_drv_probe(struct platform_device *pdev)
 
        mutex_init(&host->host_mutex);
        rtsx_usb_init_host(host);
-       pm_runtime_use_autosuspend(&pdev->dev);
-       pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
        pm_runtime_enable(&pdev->dev);
 
 #ifdef RTSX_USB_USE_LEDS_CLASS
@@ -1423,7 +1421,6 @@ static int rtsx_usb_sdmmc_drv_remove(struct platform_device *pdev)
 
        mmc_free_host(mmc);
        pm_runtime_disable(&pdev->dev);
-       pm_runtime_dont_use_autosuspend(&pdev->dev);
        platform_set_drvdata(pdev, NULL);
 
        dev_dbg(&(pdev->dev),