mmc: Poll for broken card detection case

Poll for broken card detection case instead of return
no card detected.
Signed-off-by: NJun Nie <jun.nie@linaro.org>

drivers/mmc/Kconfig

@@ -17,6 +17,11 @@ config MMC_WRITE
 	help
 	  Enable write access to MMC and SD Cards
 
+config MMC_BROKEN_CD
+	bool "Poll for broken card detection case"
+	help
+	  If card  detection feature is broken, just poll to detect.
+
 config DM_MMC
 	bool "Enable MMC controllers using Driver Model"
 	depends on DM

drivers/mmc/mmc.c

@@ -2493,8 +2493,12 @@ int mmc_start_init(struct mmc *mmc)
 	mmc->host_caps = mmc->cfg->host_caps | MMC_CAP(SD_LEGACY) |
 			 MMC_CAP(MMC_LEGACY) | MMC_MODE_1BIT;
 
+#if !defined(CONFIG_MMC_BROKEN_CD)
 	/* we pretend there's no card when init is NULL */
 	no_card = mmc_getcd(mmc) == 0;
+#else
+	no_card = 0;
+#endif
 #if !CONFIG_IS_ENABLED(DM_MMC)
 	no_card = no_card || (mmc->cfg->ops->init == NULL);
 #endif