fsl_esdhc: increase busy timeout, erasing can be slow

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>

drivers/mmc/fsl_esdhc.c

@@ -489,9 +489,12 @@ static int esdhc_send_cmd_common(struct fsl_esdhc_priv *priv, struct mmc *mmc,
 
 	/* Workaround for ESDHC errata ENGcm03648 */
 	if (!data && (cmd->resp_type & MMC_RSP_BUSY)) {
-		int timeout = 6000;
+		int timeout = 20000;
 
-		/* Poll on DATA0 line for cmd with busy signal for 600 ms */
+		/*
+		 * Poll on DATA0 line for cmd with busy signal for 2 seconds.
+		 * Erasing can be slow.
+		 */
 		while (timeout > 0 && !(esdhc_read32(&regs->prsstat) &
 					PRSSTAT_DAT0)) {
 			udelay(100);