linux-kernel - [RFC PATCH 01/10] mmc: core: improve API to make clear mmc_hw

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Date:   Mon, 21 Mar 2022 12:50:47 +0100
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     linux-mmc@...r.kernel.org
Cc:     linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [RFC PATCH 01/10] mmc: core: improve API to make clear mmc_hw_reset is for cards

To make it unambiguous that mmc_hw_reset() is for cards and not for
controllers, we a) add 'card' to the function name and b) make the
function argument mmc_card instead of mmc_host. A fallback is provided
until all users are converted.

Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
---
 drivers/mmc/core/block.c    |  2 +-
 drivers/mmc/core/core.c     | 18 +++++++++++++-----
 drivers/mmc/core/mmc_test.c |  3 +--
 include/linux/mmc/core.h    |  1 +
 4 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 4e67c1403cc9..74674a4650b0 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -993,7 +993,7 @@ static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
 		return -EEXIST;
 
 	md->reset_done |= type;
-	err = mmc_hw_reset(host);
+	err = mmc_card_hw_reset(host->card);
 	/* Ensure we switch back to the correct partition */
 	if (err) {
 		struct mmc_blk_data *main_md =
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 368f10405e13..71e75196bc53 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1984,7 +1984,8 @@ int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
 }
 EXPORT_SYMBOL(mmc_set_blocklen);
 
-static void mmc_hw_reset_for_init(struct mmc_host *host)
+/* we can't use mmc_card as a parameter, it is not populated yet */
+static void mmc_card_hw_reset_for_init(struct mmc_host *host)
 {
 	mmc_pwrseq_reset(host);
 
@@ -1994,8 +1995,8 @@ static void mmc_hw_reset_for_init(struct mmc_host *host)
 }
 
 /**
- * mmc_hw_reset - reset the card in hardware
- * @host: MMC host to which the card is attached
+ * mmc_card_hw_reset - reset the card in hardware
+ * @card: card to be reset
  *
  * Hard reset the card. This function is only for upper layers, like the
  * block layer or card drivers. You cannot use it in host drivers (struct
@@ -2003,8 +2004,9 @@ static void mmc_hw_reset_for_init(struct mmc_host *host)
  *
  * Return: 0 on success, -errno on failure
  */
-int mmc_hw_reset(struct mmc_host *host)
+int mmc_card_hw_reset(struct mmc_card *card)
 {
+	struct mmc_host *host = card->host;
 	int ret;
 
 	ret = host->bus_ops->hw_reset(host);
@@ -2014,6 +2016,12 @@ int mmc_hw_reset(struct mmc_host *host)
 
 	return ret;
 }
+EXPORT_SYMBOL(mmc_card_hw_reset);
+
+int mmc_hw_reset(struct mmc_host *host)
+{
+	return mmc_card_hw_reset(host->card);
+}
 EXPORT_SYMBOL(mmc_hw_reset);
 
 int mmc_sw_reset(struct mmc_host *host)
@@ -2045,7 +2053,7 @@ static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
 	 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
 	 * do a hardware reset if possible.
 	 */
-	mmc_hw_reset_for_init(host);
+	mmc_card_hw_reset_for_init(host);
 
 	/*
 	 * sdio_reset sends CMD52 to reset card.  Since we do not know
diff --git a/drivers/mmc/core/mmc_test.c b/drivers/mmc/core/mmc_test.c
index e6a2fd2c6d5c..bfcae8f79cbd 100644
--- a/drivers/mmc/core/mmc_test.c
+++ b/drivers/mmc/core/mmc_test.c
@@ -2325,10 +2325,9 @@ static int mmc_test_profile_sglen_r_nonblock_perf(struct mmc_test_card *test)
 static int mmc_test_reset(struct mmc_test_card *test)
 {
 	struct mmc_card *card = test->card;
-	struct mmc_host *host = card->host;
 	int err;
 
-	err = mmc_hw_reset(host);
+	err = mmc_card_hw_reset(card);
 	if (!err) {
 		/*
 		 * Reset will re-enable the card's command queue, but tests
diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h
index 71101d1ec825..25a7cf69d919 100644
--- a/include/linux/mmc/core.h
+++ b/include/linux/mmc/core.h
@@ -176,6 +176,7 @@ int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd,
 		int retries);
 
 int mmc_hw_reset(struct mmc_host *host);
+int mmc_card_hw_reset(struct mmc_card *card);
 int mmc_sw_reset(struct mmc_host *host);
 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card);
 
-- 
2.30.2