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Commit b1231b2f authored by Jerome Brunet's avatar Jerome Brunet Committed by Ulf Hansson
Browse files

mmc: meson-gx: implement voltage switch callback 



Implement voltage switch callback (shamelessly copied from sunxi mmc
driver). This allow, with the appropriate tuning function, to use
SD ultra high speed modes.

Reviewed-by: default avatarKevin Hilman <khilman@baylibre.com>
Signed-off-by: default avatarJerome Brunet <jbrunet@baylibre.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 033d7168

drivers/mmc/host/meson-gx-mmc.c

+22 −0
Original line number Diff line number Diff line
@@ -1049,6 +1049,27 @@ static int meson_mmc_card_busy(struct mmc_host *mmc) 
	return !(FIELD_GET(STATUS_DATI, regval) & 0xf);

}



static int meson_mmc_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios)

{

	/* vqmmc regulator is available */

	if (!IS_ERR(mmc->supply.vqmmc)) {

		/*

		 * The usual amlogic setup uses a GPIO to switch from one

		 * regulator to the other. While the voltage ramp up is

		 * pretty fast, care must be taken when switching from 3.3v

		 * to 1.8v. Please make sure the regulator framework is aware

		 * of your own regulator constraints

		 */

		return mmc_regulator_set_vqmmc(mmc, ios);

	}



	/* no vqmmc regulator, assume fixed regulator at 3/3.3V */

	if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)

		return 0;



	return -EINVAL;

}



static const struct mmc_host_ops meson_mmc_ops = {

	.request	= meson_mmc_request,

	.set_ios	= meson_mmc_set_ios,
@@ -1057,6 +1078,7 @@ static const struct mmc_host_ops meson_mmc_ops = { 
	.post_req	= meson_mmc_post_req,

	.execute_tuning = meson_mmc_execute_tuning,

	.card_busy	= meson_mmc_card_busy,

	.start_signal_voltage_switch = meson_mmc_voltage_switch,

};



static int meson_mmc_probe(struct platform_device *pdev)