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drivers: mmc: Add wait_dat0 support for sdhci driver

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Adds an implementation of the wait_dat0 MMC operation for the DM SDHCI
driver, allowing the driver to continue when the card is ready rather
than waiting for the worst case time on each MMC switch operation.

Signed-off-by: Stephen Carlson <stcarlso@linux.microsoft.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
Stephen Carlson 2021-08-17 12:46:41 -07:00 committed by Jaehoon Chung
parent ee02543561
commit 40e6f52454
2 changed files with 22 additions and 0 deletions
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20
drivers/mmc/sdhci.c
View file

@ -780,6 +780,25 @@ static int sdhci_get_cd(struct udevice *dev)
return value;
}
static int sdhci_wait_dat0(struct udevice *dev, int state,
int timeout_us)
{
int tmp;
struct mmc *mmc = mmc_get_mmc_dev(dev);
struct sdhci_host *host = mmc->priv;
unsigned long timeout = timer_get_us() + timeout_us;
// readx_poll_timeout is unsuitable because sdhci_readl accepts
// two arguments
do {
tmp = sdhci_readl(host, SDHCI_PRESENT_STATE);
if (!!(tmp & SDHCI_DATA_0_LVL_MASK) == !!state)
return 0;
} while (!timeout_us || !time_after(timer_get_us(), timeout));
return -ETIMEDOUT;
}
const struct dm_mmc_ops sdhci_ops = {
.send_cmd = sdhci_send_command,
.set_ios = sdhci_set_ios,
@ -788,6 +807,7 @@ const struct dm_mmc_ops sdhci_ops = {
#ifdef MMC_SUPPORTS_TUNING
.execute_tuning = sdhci_execute_tuning,
#endif
.wait_dat0 = sdhci_wait_dat0,
};
#else
static const struct mmc_ops sdhci_ops = {

2
include/sdhci.h
View file

@ -65,6 +65,8 @@
#define SDHCI_CARD_STATE_STABLE BIT(17)
#define SDHCI_CARD_DETECT_PIN_LEVEL BIT(18)
#define SDHCI_WRITE_PROTECT BIT(19)
#define SDHCI_DATA_LVL_MASK 0x00F00000
#define SDHCI_DATA_0_LVL_MASK BIT(20)
#define SDHCI_HOST_CONTROL 0x28
#define SDHCI_CTRL_LED BIT(0)