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

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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>
This commit is contained in:
Jean-Jacques Hiblot
2025-04-10 11:00:20 +02:00
committed by Peng Fan
parent 392a5860bd
commit d770e325e9
3 changed files with 28 additions and 0 deletions
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13
drivers/mmc/mmc-uclass.c
View File

@@ -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);

6
drivers/mmc/mmc.c
View File

@@ -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);

9
include/mmc.h
View File

@@ -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);