linux-kernel - [RFC PATCH v2 4/7] mmc: host: sdhci: Factor out the command configuration

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Message-Id: <c021fa8991c8be8aa28d1268a44be559e94db2de.1587888520.git.baolin.wang7@gmail.com>
Date:   Sun, 26 Apr 2020 17:38:57 +0800
From:   Baolin Wang <baolin.wang7@...il.com>
To:     axboe@...nel.dk, ulf.hansson@...aro.org, adrian.hunter@...el.com
Cc:     arnd@...db.de, linus.walleij@...aro.org, paolo.valente@...aro.org,
        ming.lei@...hat.com, orsonzhai@...il.com, zhang.lyra@...il.com,
        baolin.wang7@...il.com, linux-mmc@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v2 4/7] mmc: host: sdhci: Factor out the command configuration

Move the SD command configuration into one separate function to simplify
the sdhci_send_command(). Moreover this function can be used to support
ADMA3 transfer mode in following patches.

Signed-off-by: Baolin Wang <baolin.wang7@...il.com>
---
 drivers/mmc/host/sdhci.c | 69 +++++++++++++++++++++++-----------------
 1 file changed, 39 insertions(+), 30 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index afea8393c71f..3d4cdf0e0535 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1579,9 +1579,45 @@ static void sdhci_finish_data(struct sdhci_host *host)
 	__sdhci_finish_data(host, false);
 }
 
-static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
+static int sdhci_get_command(struct sdhci_host *host, struct mmc_command *cmd)
 {
 	int flags;
+
+	if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
+		WARN_ONCE(1, "Unsupported response type!\n");
+		/*
+		 * This does not happen in practice because 136-bit response
+		 * commands never have busy waiting, so rather than complicate
+		 * the error path, just remove busy waiting and continue.
+		 */
+		cmd->flags &= ~MMC_RSP_BUSY;
+	}
+
+	if (!(cmd->flags & MMC_RSP_PRESENT))
+		flags = SDHCI_CMD_RESP_NONE;
+	else if (cmd->flags & MMC_RSP_136)
+		flags = SDHCI_CMD_RESP_LONG;
+	else if (cmd->flags & MMC_RSP_BUSY)
+		flags = SDHCI_CMD_RESP_SHORT_BUSY;
+	else
+		flags = SDHCI_CMD_RESP_SHORT;
+
+	if (cmd->flags & MMC_RSP_CRC)
+		flags |= SDHCI_CMD_CRC;
+	if (cmd->flags & MMC_RSP_OPCODE)
+		flags |= SDHCI_CMD_INDEX;
+
+	/* CMD19 is special in that the Data Present Select should be set */
+	if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
+	    cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
+		flags |= SDHCI_CMD_DATA;
+
+	return SDHCI_MAKE_CMD(cmd->opcode, flags);
+}
+
+static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
+{
+	int command;
 	u32 mask;
 	unsigned long timeout;
 
@@ -1625,34 +1661,7 @@ static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 
 	sdhci_set_transfer_mode(host, cmd);
 
-	if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
-		WARN_ONCE(1, "Unsupported response type!\n");
-		/*
-		 * This does not happen in practice because 136-bit response
-		 * commands never have busy waiting, so rather than complicate
-		 * the error path, just remove busy waiting and continue.
-		 */
-		cmd->flags &= ~MMC_RSP_BUSY;
-	}
-
-	if (!(cmd->flags & MMC_RSP_PRESENT))
-		flags = SDHCI_CMD_RESP_NONE;
-	else if (cmd->flags & MMC_RSP_136)
-		flags = SDHCI_CMD_RESP_LONG;
-	else if (cmd->flags & MMC_RSP_BUSY)
-		flags = SDHCI_CMD_RESP_SHORT_BUSY;
-	else
-		flags = SDHCI_CMD_RESP_SHORT;
-
-	if (cmd->flags & MMC_RSP_CRC)
-		flags |= SDHCI_CMD_CRC;
-	if (cmd->flags & MMC_RSP_OPCODE)
-		flags |= SDHCI_CMD_INDEX;
-
-	/* CMD19 is special in that the Data Present Select should be set */
-	if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
-	    cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
-		flags |= SDHCI_CMD_DATA;
+	command = sdhci_get_command(host, cmd);
 
 	timeout = jiffies;
 	if (host->data_timeout)
@@ -1666,7 +1675,7 @@ static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 	if (host->use_external_dma)
 		sdhci_external_dma_pre_transfer(host, cmd);
 
-	sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
+	sdhci_writew(host, command, SDHCI_COMMAND);
 
 	return true;
 }
-- 
2.17.1