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mmc: core: Implement ->sw_reset bus ops for SDIO 

Let's implement the ->sw_reset() bus ops to allow SDIO func drivers, in
particular, to make a SW reset without doing a full power cycle of the SDIO
card.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Quentin Schulz <quentin.schulz@bootlin.com>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
This commit is contained in:
Ulf Hansson 2018-04-05 16:31:25 +02:00
parent 508c9864cc
commit 7405df4c79
1 changed files with 13 additions and 0 deletions
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13
drivers/mmc/core/sdio.c
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@ -1056,6 +1056,18 @@ static int mmc_sdio_hw_reset(struct mmc_host *host)
return mmc_sdio_power_restore(host);
}
static int mmc_sdio_sw_reset(struct mmc_host *host)
{
mmc_set_clock(host, host->f_init);
sdio_reset(host);
mmc_go_idle(host);
mmc_set_initial_state(host);
mmc_set_initial_signal_voltage(host);
return mmc_sdio_reinit_card(host, 0);
}
static const struct mmc_bus_ops mmc_sdio_ops = {
.remove = mmc_sdio_remove,
.detect = mmc_sdio_detect,
@ -1067,6 +1079,7 @@ static const struct mmc_bus_ops mmc_sdio_ops = {
.power_restore = mmc_sdio_power_restore,
.alive = mmc_sdio_alive,
.hw_reset = mmc_sdio_hw_reset,
.sw_reset = mmc_sdio_sw_reset,
};