diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 11d031b8708cc5d3bc520e9a85de023717d7edc1..89ba4516cb8c02e665f67bc0c261fe89cab2ff6f 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -628,9 +628,11 @@ static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd)
 	/* timeout in us */
 	if (!data)
 		target_timeout = cmd->cmd_timeout_ms * 1000;
-	else
-		target_timeout = data->timeout_ns / 1000 +
-			data->timeout_clks / host->clock;
+	else {
+		target_timeout = data->timeout_ns / 1000;
+		if (host->clock)
+			target_timeout += data->timeout_clks / host->clock;
+	}
 
 	/*
 	 * Figure out needed cycles.