mmc: break out get_op_cond code to its own function

This code is useful for testing the existance of devices that
do not have card detect capabilities.  This breaks out the core
functionality and leaves the actual init logic and error reporting
in mmc_start_init().

Signed-off-by: Jon Nettleton <jon@solid-run.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Stefano Babic <sbabic@denx.de>

drivers/mmc/mmc.c

@@ -2491,36 +2491,11 @@ static int mmc_power_cycle(struct mmc *mmc)
 	return mmc_power_on(mmc);
 }
 
-int mmc_start_init(struct mmc *mmc)
+int mmc_get_op_cond(struct mmc *mmc)
 {
-	bool no_card;
 	bool uhs_en = supports_uhs(mmc->cfg->host_caps);
 	int err;
 
-	/*
-	 * all hosts are capable of 1 bit bus-width and able to use the legacy
-	 * timings.
-	 */
-	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
-	if (no_card) {
-		mmc->has_init = 0;
-#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
-		pr_err("MMC: no card present\n");
-#endif
-		return -ENOMEDIUM;
-	}
-
 	if (mmc->has_init)
 		return 0;
 
@@ -2597,6 +2572,40 @@ retry:
 		}
 	}
 
+	return err;
+}
+
+int mmc_start_init(struct mmc *mmc)
+{
+	bool no_card;
+	int err = 0;
+
+	/*
+	 * all hosts are capable of 1 bit bus-width and able to use the legacy
+	 * timings.
+	 */
+	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
+	if (no_card) {
+		mmc->has_init = 0;
+#if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
+		pr_err("MMC: no card present\n");
+#endif
+		return -ENOMEDIUM;
+	}
+
+	err = mmc_get_op_cond(mmc);
+
 	if (!err)
 		mmc->init_in_progress = 1;
 

include/mmc.h

@@ -754,6 +754,16 @@ int mmc_set_bkops_enable(struct mmc *mmc);
 
 /**
  * Start device initialization and return immediately; it does not block on
+ * polling OCR (operation condition register) status. Useful for checking
+ * the presence of SD/eMMC when no card detect logic is available.
+ *
+ * @param mmc	Pointer to a MMC device struct
+ * @return 0 on success, <0 on error.
+ */
+int mmc_get_op_cond(struct mmc *mmc);
+
+/**
+ * Start device initialization and return immediately; it does not block on
  * polling OCR (operation condition register) status.  Then you should call
  * mmc_init, which would block on polling OCR status and complete the device
  * initializatin.