mmc: meson-gx: switch to dynamic timeout values

Currently we use a fixed timeout of 4s for all data transfers. Switch
to dynamic timeout values by making use of data->timeout_ns.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/meson-gx-mmc.c

@@ -163,6 +163,18 @@ struct sd_emmc_desc {
 #define CMD_RESP_MASK GENMASK(31, 1)
 #define CMD_RESP_SRAM BIT(0)
 
+static unsigned int meson_mmc_get_timeout_msecs(struct mmc_data *data)
+{
+	unsigned int timeout = data->timeout_ns / NSEC_PER_MSEC;
+
+	if (!timeout)
+		return SD_EMMC_CMD_TIMEOUT_DATA;
+
+	timeout = roundup_pow_of_two(timeout);
+
+	return min(timeout, 32768U); /* max. 2^15 ms */
+}
+
 static int meson_mmc_clk_set(struct meson_host *host, unsigned long clk_rate)
 {
 	struct mmc_host *mmc = host->mmc;
@@ -441,7 +453,7 @@ static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
 	if (data) {
 		cmd_cfg |= CMD_CFG_DATA_IO;
 		cmd_cfg |= FIELD_PREP(CMD_CFG_TIMEOUT_MASK,
-				      ilog2(SD_EMMC_CMD_TIMEOUT_DATA));
+				      ilog2(meson_mmc_get_timeout_msecs(data)));
 
 		if (data->blocks > 1) {
 			cmd_cfg |= CMD_CFG_BLOCK_MODE;