mmc: core: Factor out some of the code in mmc_go_idle()

Move some part out from mmc_go_idle() into a new function called
__mmc_go_idle(), allowing it to be re-used, which is shown from a
subsequent change.

Signed-off-by: Victor Shih <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/core/mmc_ops.c

···
 	return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
 }
 
+int __mmc_go_idle(struct mmc_host *host)
+{
+	struct mmc_command cmd = {};
+	int err;
+
+	cmd.opcode = MMC_GO_IDLE_STATE;
+	cmd.arg = 0;
+	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
+
+	err = mmc_wait_for_cmd(host, &cmd, 0);
+	mmc_delay(1);
+
+	return err;
+}
+
 int mmc_go_idle(struct mmc_host *host)
 {
 	int err;
-	struct mmc_command cmd = {};
 
 	/*
 	 * Non-SPI hosts need to prevent chipselect going active during
···
 		mmc_delay(1);
 	}
 
-	cmd.opcode = MMC_GO_IDLE_STATE;
-	cmd.arg = 0;
-	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
-
-	err = mmc_wait_for_cmd(host, &cmd, 0);
-
-	mmc_delay(1);
+	err = __mmc_go_idle(host);
 
 	if (!mmc_host_is_spi(host)) {
 		mmc_set_chip_select(host, MMC_CS_DONTCARE);

drivers/mmc/core/mmc_ops.h

···
 int mmc_select_card(struct mmc_card *card);
 int mmc_deselect_cards(struct mmc_host *host);
 int mmc_set_dsr(struct mmc_host *host);
+int __mmc_go_idle(struct mmc_host *host);
 int mmc_go_idle(struct mmc_host *host);
 int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr);
 int mmc_set_relative_addr(struct mmc_card *card);