[PATCH v11 5/6] mmc: core: Move and split reset functions for eMMC

[Kamal Dasu <kamal.dasu@broadcom.com>]

From: Ulf Hansson <ulf.hansson@oss.qualcomm.com>

To prepare for a subsequent change and to simplify review, let's move the
function for resetting the eMMC card a few lines up in the file.

While at it, split the cache flush out of _mmc_hw_reset() into a new
mmc_hw_reset_recovery() function and use that for the ->hw_reset() bus
operation. This keeps the flush for recovery, where it was intended, but
allows the card to be reset without it, by calling _mmc_hw_reset()
directly. That is needed when resetting the card at system resume, as the
cache has already been flushed at suspend and the flush would only fail
with a timeout, after the card has been accessed by firmware.

There are no functional changes.

Signed-off-by: Ulf Hansson <ulf.hansson@oss.qualcomm.com>
Co-developed-by: Kamal Dasu <kamal.dasu@broadcom.com>
Signed-off-by: Kamal Dasu <kamal.dasu@broadcom.com>
---
 drivers/mmc/core/mmc.c | 73 ++++++++++++++++++++++--------------------
 1 file changed, 39 insertions(+), 34 deletions(-)

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index c936272bcd81..026003ba507d 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -2271,6 +2271,44 @@ static int mmc_shutdown(struct mmc_host *host)
 	return err;
 }
 
+static bool mmc_card_can_reset(struct mmc_card *card)
+{
+	u8 rst_n_function;
+
+	rst_n_function = card->ext_csd.rst_n_function;
+	return ((rst_n_function & EXT_CSD_RST_N_EN_MASK) == EXT_CSD_RST_N_ENABLED);
+}
+
+static int _mmc_hw_reset(struct mmc_host *host)
+{
+	struct mmc_card *card = host->card;
+
+	if ((host->caps & MMC_CAP_HW_RESET) && host->ops->card_hw_reset &&
+	    mmc_card_can_reset(card)) {
+		/* If the card accept RST_n signal, send it. */
+		mmc_set_clock(host, host->f_init);
+		host->ops->card_hw_reset(host);
+		/* Set initial state and call mmc_set_ios */
+		mmc_set_initial_state(host);
+	} else {
+		/* Do a brute force power cycle */
+		mmc_power_cycle(host, card->ocr);
+		mmc_pwrseq_reset(host);
+	}
+	return mmc_init_card(host, card->ocr, card);
+}
+
+static int mmc_hw_reset_recovery(struct mmc_host *host)
+{
+	/*
+	 * In the case of recovery, we can't expect flushing the cache to work
+	 * always, but we have a go and ignore errors.
+	 */
+	_mmc_flush_cache(host);
+
+	return _mmc_hw_reset(host);
+}
+
 /*
  * Callback for resume.
  */
@@ -2319,39 +2357,6 @@ static int mmc_runtime_resume(struct mmc_host *host)
 	return 0;
 }
 
-static bool mmc_card_can_reset(struct mmc_card *card)
-{
-	u8 rst_n_function;
-
-	rst_n_function = card->ext_csd.rst_n_function;
-	return ((rst_n_function & EXT_CSD_RST_N_EN_MASK) == EXT_CSD_RST_N_ENABLED);
-}
-
-static int _mmc_hw_reset(struct mmc_host *host)
-{
-	struct mmc_card *card = host->card;
-
-	/*
-	 * In the case of recovery, we can't expect flushing the cache to work
-	 * always, but we have a go and ignore errors.
-	 */
-	_mmc_flush_cache(host);
-
-	if ((host->caps & MMC_CAP_HW_RESET) && host->ops->card_hw_reset &&
-	     mmc_card_can_reset(card)) {
-		/* If the card accept RST_n signal, send it. */
-		mmc_set_clock(host, host->f_init);
-		host->ops->card_hw_reset(host);
-		/* Set initial state and call mmc_set_ios */
-		mmc_set_initial_state(host);
-	} else {
-		/* Do a brute force power cycle */
-		mmc_power_cycle(host, card->ocr);
-		mmc_pwrseq_reset(host);
-	}
-	return mmc_init_card(host, card->ocr, card);
-}
-
 /**
  * _mmc_handle_undervoltage - Handle an undervoltage event for MMC/eMMC devices
  * @host: MMC host structure
@@ -2410,7 +2415,7 @@ static const struct mmc_bus_ops mmc_ops = {
 	.runtime_resume = mmc_runtime_resume,
 	.alive = mmc_alive,
 	.shutdown = mmc_shutdown,
-	.hw_reset = _mmc_hw_reset,
+	.hw_reset = mmc_hw_reset_recovery,
 	.cache_enabled = _mmc_cache_enabled,
 	.flush_cache = _mmc_flush_cache,
 	.handle_undervoltage = _mmc_handle_undervoltage,
-- 
2.34.1