[PATCH 1/2] mmc: Add support for wait_dat0 callback

[Loic Poulain]

There is no wait_dat0 mmc ops, causing operations waiting for data
line state change (e.g mmc_switch_voltage) to fallback to a 250ms
active delay. mmc_ops still used when DM_MMC is not enabled, which
is often the case for SPL. The result can be unexpectly long SPL
boot time.

This change adds support for wait_dat0() mmc operation.

Signed-off-by: Loic Poulain <loic.poulain at linaro.org>
---
 drivers/mmc/mmc.c | 3 +++
 include/mmc.h     | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index f6ccd83..109f340 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -34,6 +34,9 @@ static int mmc_set_signal_voltage(struct mmc *mmc, uint signal_voltage);
 
 static int mmc_wait_dat0(struct mmc *mmc, int state, int timeout_us)
 {
+	if (mmc->cfg->ops->wait_dat0)
+		return mmc->cfg->ops->wait_dat0(mmc, state, timeout_us);
+
 	return -ENOSYS;
 }
 
diff --git a/include/mmc.h b/include/mmc.h
index 6bdcce8..b7e94e8 100644
--- a/include/mmc.h
+++ b/include/mmc.h
@@ -561,6 +561,7 @@ struct mmc_ops {
 	int (*getwp)(struct mmc *mmc);
 	int (*host_power_cycle)(struct mmc *mmc);
 	int (*get_b_max)(struct mmc *mmc, void *dst, lbaint_t blkcnt);
+	int (*wait_dat0)(struct mmc *mmc, int state, int timeout_us);
 };
 
 static inline int mmc_hs400_prepare_ddr(struct mmc *mmc)
-- 
2.7.4