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mmc: mtk-sd: implement waiting for DAT0 line state

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With the recent changes on mmc driver, we saw that the boot is ~5 secs
longer compared to v2021.07 on mediatek platforms.

This regression is seen during mmc_init and caused by the following
patch [1].

Indeed since we did not support poll dat0, we fulfilled the condition
of [1] and a delay of 500 ms was added for every __mmc_switch call.

By adding the support of wait_dat0(), we now don't need to mdelay
during mmc_init anymore.

[1]: https://patchwork.ozlabs.org/project/uboot/patch/1629192034-64056-1-git-send-email-ye.li@nxp.com/

Signed-off-by: Julien Masson <jmasson@baylibre.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
Julien Masson 2021-11-05 14:34:14 +01:00 committed by Tom Rini
parent 55de0c1931
commit faf5d4d53d
1 changed files with 15 additions and 0 deletions
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15
drivers/mmc/mtk-sd.c
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@ -1724,6 +1724,20 @@ static int msdc_drv_bind(struct udevice *dev)
return mmc_bind(dev, &plat->mmc, &plat->cfg);
}
static int msdc_ops_wait_dat0(struct udevice *dev, int state, int timeout_us)
{
struct msdc_host *host = dev_get_priv(dev);
int ret;
u32 reg;
ret = readl_poll_sleep_timeout(&host->base->msdc_ps, reg,
!!(reg & MSDC_PS_DAT0) == !!state,
1000, /* 1 ms */
timeout_us);
return ret;
}
static const struct dm_mmc_ops msdc_ops = {
.send_cmd = msdc_ops_send_cmd,
.set_ios = msdc_ops_set_ios,
@ -1732,6 +1746,7 @@ static const struct dm_mmc_ops msdc_ops = {
#ifdef MMC_SUPPORTS_TUNING
.execute_tuning = msdc_execute_tuning,
#endif
.wait_dat0 = msdc_ops_wait_dat0,
};
static const struct msdc_compatible mt7620_compat = {