mmc: Rename timeout parameters for clarification

It's quite hard to figure out time units for various function that have
timeout parameters. This leads to possible errors when one forgets to
convert ms to us, for example. Let's rename those parameters
correspondingly to 'timeout_us' and 'timeout_ms' to prevent such issues
further.

While at it, add time units info as comments to struct mmc fields.

This commit doesn't change the behavior, only renames parameters names.
Buildman should report no changes at all.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Igor Opaniuk <igor.opaniuk@gmail.com>

5 files changed, 27 insertions, 26 deletions

diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c
index 4a12324c6a..37c3843902 100644
--- a/drivers/mmc/mmc-uclass.c
+++ b/drivers/mmc/mmc-uclass.c
@@ -47,18 +47,18 @@ int mmc_set_ios(struct mmc *mmc)
 	return dm_mmc_set_ios(mmc->dev);
 }
 
-int dm_mmc_wait_dat0(struct udevice *dev, int state, int timeout)
+int dm_mmc_wait_dat0(struct udevice *dev, int state, int timeout_us)
 {
 	struct dm_mmc_ops *ops = mmc_get_ops(dev);
 
 	if (!ops->wait_dat0)
 		return -ENOSYS;
-	return ops->wait_dat0(dev, state, timeout);
+	return ops->wait_dat0(dev, state, timeout_us);
 }
 
-int mmc_wait_dat0(struct mmc *mmc, int state, int timeout)
+int mmc_wait_dat0(struct mmc *mmc, int state, int timeout_us)
 {
-	return dm_mmc_wait_dat0(mmc->dev, state, timeout);
+	return dm_mmc_wait_dat0(mmc->dev, state, timeout_us);
 }
 
 int dm_mmc_get_wp(struct udevice *dev)
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index e247730ff2..c8f71cd0c1 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -31,7 +31,7 @@ static int mmc_select_mode_and_width(struct mmc *mmc, uint card_caps);
 
 #if !CONFIG_IS_ENABLED(DM_MMC)
 
-static int mmc_wait_dat0(struct mmc *mmc, int state, int timeout)
+static int mmc_wait_dat0(struct mmc *mmc, int state, int timeout_us)
 {
 	return -ENOSYS;
 }
@@ -230,12 +230,12 @@ int mmc_send_status(struct mmc *mmc, unsigned int *status)
 	return -ECOMM;
 }
 
-int mmc_poll_for_busy(struct mmc *mmc, int timeout)
+int mmc_poll_for_busy(struct mmc *mmc, int timeout_ms)
 {
 	unsigned int status;
 	int err;
 
-	err = mmc_wait_dat0(mmc, 1, timeout * 1000);
+	err = mmc_wait_dat0(mmc, 1, timeout_ms * 1000);
 	if (err != -ENOSYS)
 		return err;
 
@@ -256,13 +256,13 @@ int mmc_poll_for_busy(struct mmc *mmc, int timeout)
 			return -ECOMM;
 		}
 
-		if (timeout-- <= 0)
+		if (timeout_ms-- <= 0)
 			break;
 
 		udelay(1000);
 	}
 
-	if (timeout <= 0) {
+	if (timeout_ms <= 0) {
 #if !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_LIBCOMMON_SUPPORT)
 		pr_err("Timeout waiting card ready\n");
 #endif
@@ -750,17 +750,17 @@ static int __mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value,
 {
 	unsigned int status, start;
 	struct mmc_cmd cmd;
-	int timeout = DEFAULT_CMD6_TIMEOUT_MS;
+	int timeout_ms = DEFAULT_CMD6_TIMEOUT_MS;
 	bool is_part_switch = (set == EXT_CSD_CMD_SET_NORMAL) &&
 			      (index == EXT_CSD_PART_CONF);
 	int retries = 3;
 	int ret;
 
 	if (mmc->gen_cmd6_time)
-		timeout = mmc->gen_cmd6_time * 10;
+		timeout_ms = mmc->gen_cmd6_time * 10;
 
 	if (is_part_switch  && mmc->part_switch_time)
-		timeout = mmc->part_switch_time * 10;
+		timeout_ms = mmc->part_switch_time * 10;
 
 	cmd.cmdidx = MMC_CMD_SWITCH;
 	cmd.resp_type = MMC_RSP_R1b;
@@ -778,7 +778,7 @@ static int __mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value,
 	start = get_timer(0);
 
 	/* poll dat0 for rdy/buys status */
-	ret = mmc_wait_dat0(mmc, 1, timeout * 1000);
+	ret = mmc_wait_dat0(mmc, 1, timeout_ms * 1000);
 	if (ret && ret != -ENOSYS)
 		return ret;
 
@@ -788,11 +788,11 @@ static int __mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value,
 	 * stated timeout to be sufficient.
 	 */
 	if (ret == -ENOSYS && !send_status)
-		mdelay(timeout);
+		mdelay(timeout_ms);
 
 	/* Finally wait until the card is ready or indicates a failure
 	 * to switch. It doesn't hurt to use CMD13 here even if send_status
-	 * is false, because by now (after 'timeout' ms) the bus should be
+	 * is false, because by now (after 'timeout_ms' ms) the bus should be
 	 * reliable.
 	 */
 	do {
@@ -806,7 +806,7 @@ static int __mmc_switch(struct mmc *mmc, u8 set, u8 index, u8 value,
 		if (!ret && (status & MMC_STATUS_RDY_FOR_DATA))
 			return 0;
 		udelay(100);
-	} while (get_timer(start) < timeout);
+	} while (get_timer(start) < timeout_ms);
 
 	return -ETIMEDOUT;
 }
diff --git a/drivers/mmc/mmc_write.c b/drivers/mmc/mmc_write.c
index 02648b0f50..b52ff9f3bc 100644
--- a/drivers/mmc/mmc_write.c
+++ b/drivers/mmc/mmc_write.c
@@ -79,7 +79,7 @@ ulong mmc_berase(struct blk_desc *block_dev, lbaint_t start, lbaint_t blkcnt)
 	u32 start_rem, blkcnt_rem;
 	struct mmc *mmc = find_mmc_device(dev_num);
 	lbaint_t blk = 0, blk_r = 0;
-	int timeout = 1000;
+	int timeout_ms = 1000;
 
 	if (!mmc)
 		return -1;
@@ -119,7 +119,7 @@ ulong mmc_berase(struct blk_desc *block_dev, lbaint_t start, lbaint_t blkcnt)
 		blk += blk_r;
 
 		/* Waiting for the ready status */
-		if (mmc_poll_for_busy(mmc, timeout))
+		if (mmc_poll_for_busy(mmc, timeout_ms))
 			return 0;
 	}
 
@@ -131,7 +131,7 @@ static ulong mmc_write_blocks(struct mmc *mmc, lbaint_t start,
 {
 	struct mmc_cmd cmd;
 	struct mmc_data data;
-	int timeout = 1000;
+	int timeout_ms = 1000;
 
 	if ((start + blkcnt) > mmc_get_blk_desc(mmc)->lba) {
 		printf("MMC: block number 0x" LBAF " exceeds max(0x" LBAF ")\n",
@@ -177,7 +177,7 @@ static ulong mmc_write_blocks(struct mmc *mmc, lbaint_t start,
 	}
 
 	/* Waiting for the ready status */
-	if (mmc_poll_for_busy(mmc, timeout))
+	if (mmc_poll_for_busy(mmc, timeout_ms))
 		return 0;
 
 	return blkcnt;
diff --git a/drivers/mmc/omap_hsmmc.c b/drivers/mmc/omap_hsmmc.c
index 3ea7f4e173..bade129aea 100644
--- a/drivers/mmc/omap_hsmmc.c
+++ b/drivers/mmc/omap_hsmmc.c
@@ -430,7 +430,7 @@ static void omap_hsmmc_conf_bus_power(struct mmc *mmc, uint signal_voltage)
 	writel(ac12, &mmc_base->ac12);
 }
 
-static int omap_hsmmc_wait_dat0(struct udevice *dev, int state, int timeout)
+static int omap_hsmmc_wait_dat0(struct udevice *dev, int state, int timeout_us)
 {
 	int ret = -ETIMEDOUT;
 	u32 con;
@@ -442,8 +442,8 @@ static int omap_hsmmc_wait_dat0(struct udevice *dev, int state, int timeout)
 	con = readl(&mmc_base->con);
 	writel(con | CON_CLKEXTFREE | CON_PADEN, &mmc_base->con);
 
-	timeout = DIV_ROUND_UP(timeout, 10); /* check every 10 us. */
-	while (timeout--)	{
+	timeout_us = DIV_ROUND_UP(timeout_us, 10); /* check every 10 us. */
+	while (timeout_us--) {
 		dat0_high = !!(readl(&mmc_base->pstate) & PSTATE_DLEV_DAT0);
 		if (dat0_high == target_dat0_high) {
 			ret = 0;
diff --git a/drivers/mmc/renesas-sdhi.c b/drivers/mmc/renesas-sdhi.c
index 7c53aa221e..0cb65b480d 100644
--- a/drivers/mmc/renesas-sdhi.c
+++ b/drivers/mmc/renesas-sdhi.c
@@ -499,15 +499,16 @@ static int renesas_sdhi_set_ios(struct udevice *dev)
 }
 
 #if CONFIG_IS_ENABLED(MMC_UHS_SUPPORT)
-static int renesas_sdhi_wait_dat0(struct udevice *dev, int state, int timeout)
+static int renesas_sdhi_wait_dat0(struct udevice *dev, int state,
+				  int timeout_us)
 {
 	int ret = -ETIMEDOUT;
 	bool dat0_high;
 	bool target_dat0_high = !!state;
 	struct tmio_sd_priv *priv = dev_get_priv(dev);
 
-	timeout = DIV_ROUND_UP(timeout, 10); /* check every 10 us. */
-	while (timeout--) {
+	timeout_us = DIV_ROUND_UP(timeout_us, 10); /* check every 10 us. */
+	while (timeout_us--) {
 		dat0_high = !!(tmio_sd_readl(priv, TMIO_SD_INFO2) & TMIO_SD_INFO2_DAT0);
 		if (dat0_high == target_dat0_high) {
 			ret = 0;