From: Jean-Jacques Hiblot <jjhiblot@ti.com>
Date: Thu, 10 Apr 2025 09:00:20 +0000 (+0200)
Subject: mmc: Add a new callback function to perform the 74 clocks cycle sequence
X-Git-Tag: v2025.07-rc1~34^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d770e325e9d2fd3ba94481fc6ee41c25e799b325;p=pandora-u-boot.git

mmc: Add a new callback function to perform the 74 clocks cycle sequence

Add a new callback function *send_init_stream* which start a sequence of
at least 74 clock cycles.
The mmc core uses *mmc_send_init_stream* in order to invoke the callback
function. This will be used during power cycle where the specification
requires such a sequence after power up.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---

diff --git a/drivers/mmc/mmc-uclass.c b/drivers/mmc/mmc-uclass.c
index 9af84da1599..2f4dc5bd887 100644
--- a/drivers/mmc/mmc-uclass.c
+++ b/drivers/mmc/mmc-uclass.c
@@ -83,6 +83,19 @@ int mmc_wait_dat0(struct mmc *mmc, int state, int timeout_us)
 	return dm_mmc_wait_dat0(mmc->dev, state, timeout_us);
 }
 
+void dm_mmc_send_init_stream(struct udevice *dev)
+{
+	struct dm_mmc_ops *ops = mmc_get_ops(dev);
+
+	if (ops->send_init_stream)
+		ops->send_init_stream(dev);
+}
+
+void mmc_send_init_stream(struct mmc *mmc)
+{
+	dm_mmc_send_init_stream(mmc->dev);
+}
+
 static int dm_mmc_get_wp(struct udevice *dev)
 {
 	struct dm_mmc_ops *ops = mmc_get_ops(dev);
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 13e887eef0d..cdcf2e0c8fe 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -1663,6 +1663,10 @@ static int mmc_execute_tuning(struct mmc *mmc, uint opcode)
 }
 #endif
 
+static void mmc_send_init_stream(struct mmc *mmc)
+{
+}
+
 static int mmc_set_ios(struct mmc *mmc)
 {
 	int ret = 0;
@@ -2929,6 +2933,8 @@ int mmc_get_op_cond(struct mmc *mmc, bool quiet)
 retry:
 	mmc_set_initial_state(mmc);
 
+	mmc_send_init_stream(mmc);
+
 	/* Reset the Card */
 	err = mmc_go_idle(mmc);
 
diff --git a/include/mmc.h b/include/mmc.h
index 52cacfd0eab..eead666ae44 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -493,6 +493,14 @@ struct dm_mmc_ops {
 	 */
 	int (*set_ios)(struct udevice *dev);
 
+	/**
+	 * send_init_stream() - send the initialization stream: 74 clock cycles
+	 * This is used after power up before sending the first command
+	 *
+	 * @dev:	Device to update
+	 */
+	void (*send_init_stream)(struct udevice *dev);
+
 	/**
 	 * get_cd() - See whether a card is present
 	 *
@@ -572,6 +580,7 @@ struct dm_mmc_ops {
 
 /* Transition functions for compatibility */
 int mmc_set_ios(struct mmc *mmc);
+void mmc_send_init_stream(struct mmc *mmc);
 int mmc_getcd(struct mmc *mmc);
 int mmc_getwp(struct mmc *mmc);
 int mmc_execute_tuning(struct mmc *mmc, uint opcode);