mmc: core: fix init controller performance regression, updated patch

Add MMC_CAP2_NO_PRESCAN_POWERUP to sdhci-pci.c also, use mmc_power_off()
for MMC_CAP2_NO_PRESCAN_POWERUP.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
[cjb: previously applied v1 of this patch instead of v4]
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/core/core.c

@@ -2416,7 +2416,9 @@ void mmc_start_host(struct mmc_host *host)
 {
 	host->f_init = max(freqs[0], host->f_min);
 	host->rescan_disable = 0;
-	if (!(host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP))
+	if (host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)
+		mmc_power_off(host);
+	else
 		mmc_power_up(host);
 	mmc_detect_change(host, 0);
 }

drivers/mmc/host/sdhci-pci.c

@@ -1280,6 +1280,7 @@ static struct sdhci_pci_slot *sdhci_pci_probe_slot(
 
 	host->mmc->pm_caps = MMC_PM_KEEP_POWER | MMC_PM_WAKE_SDIO_IRQ;
 	host->mmc->slotno = slotno;
+	host->mmc->caps2 |= MMC_CAP2_NO_PRESCAN_POWERUP;
 
 	ret = sdhci_add_host(host);
 	if (ret)