mmc: mmc_spi: fix timeout calculation

Previously the cycle timeout was converted to a microsecond value but
then incorrectly treated as a nanosecond timeout. This patch changes
the code to convert both the nanosecond timeout and the cycle timeout
to a microsecond value and use that directly.
Signed-off-by: Tobias Schramm <t.schramm@manjaro.org>
Link: https://lore.kernel.org/r/20200814185011.3252020-1-t.schramm@manjaro.orgSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/mmc_spi.c

@@ -882,9 +882,9 @@ mmc_spi_data_do(struct mmc_spi_host *host, struct mmc_command *cmd,
 	else
 		clock_rate = spi->max_speed_hz;
 
-	timeout = data->timeout_ns +
+	timeout = data->timeout_ns / 1000 +
 		  data->timeout_clks * 1000000 / clock_rate;
-	timeout = usecs_to_jiffies((unsigned int)(timeout / 1000)) + 1;
+	timeout = usecs_to_jiffies((unsigned int)timeout) + 1;
 
 	/* Handle scatterlist segments one at a time, with synch for
 	 * each 512-byte block