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Commit 567c8903 authored by Johan Rudholm's avatar Johan Rudholm Committed by Chris Ball
Browse files

mmc: core: Break out start_signal_voltage_switch 



Allow callers to access the start_signal_voltage_switch host_ops
member without going through any cmd11 logic. This is mostly a
preparation for the following signal voltage switch patch.

Also, reset ios.signal_voltage to its original value if
start_signal_voltage_switch fails.

Signed-off-by: default avatarJohan Rudholm <johan.rudholm@stericsson.com>
Acked-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Tested-by: default avatarWei WANG <wei_wang@realsil.com.cn>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent d887874e

drivers/mmc/core/core.c

+23 −12
Original line number Diff line number Diff line
@@ -1317,7 +1317,26 @@ u32 mmc_select_voltage(struct mmc_host *host, u32 ocr) 
	return ocr;

}



int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, bool cmd11)

int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)

{

	int err = 0;

	int old_signal_voltage = host->ios.signal_voltage;



	host->ios.signal_voltage = signal_voltage;

	if (host->ops->start_signal_voltage_switch) {

		mmc_host_clk_hold(host);

		err = host->ops->start_signal_voltage_switch(host, &host->ios);

		mmc_host_clk_release(host);

	}



	if (err)

		host->ios.signal_voltage = old_signal_voltage;



	return err;



}



int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)

{

	struct mmc_command cmd = {0};

	int err = 0;
@@ -1328,7 +1347,7 @@ int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, bool cmd11 
	 * Send CMD11 only if the request is to switch the card to

	 * 1.8V signalling.

	 */

	if ((signal_voltage != MMC_SIGNAL_VOLTAGE_330) && cmd11) {

	if (signal_voltage != MMC_SIGNAL_VOLTAGE_330) {

		cmd.opcode = SD_SWITCH_VOLTAGE;

		cmd.arg = 0;

		cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
@@ -1341,15 +1360,7 @@ int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, bool cmd11 
			return -EIO;

	}



	host->ios.signal_voltage = signal_voltage;



	if (host->ops->start_signal_voltage_switch) {

		mmc_host_clk_hold(host);

		err = host->ops->start_signal_voltage_switch(host, &host->ios);

		mmc_host_clk_release(host);

	}



	return err;

	return __mmc_set_signal_voltage(host, signal_voltage);

}



/*
@@ -1412,7 +1423,7 @@ static void mmc_power_up(struct mmc_host *host) 
	mmc_set_ios(host);



	/* Set signal voltage to 3.3V */

	mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, false);

	__mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330);



	/*

	 * This delay should be sufficient to allow the power supply

drivers/mmc/core/core.h

+2 −2
Original line number Diff line number Diff line
@@ -40,8 +40,8 @@ void mmc_set_ungated(struct mmc_host *host); 
void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode);

void mmc_set_bus_width(struct mmc_host *host, unsigned int width);

u32 mmc_select_voltage(struct mmc_host *host, u32 ocr);

int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage,

			   bool cmd11);

int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage);

int __mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage);

void mmc_set_timing(struct mmc_host *host, unsigned int timing);

void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type);

void mmc_power_off(struct mmc_host *host);

drivers/mmc/core/mmc.c

+4 −4
Original line number Diff line number Diff line
@@ -769,11 +769,11 @@ static int mmc_select_hs200(struct mmc_card *card) 


	if (card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_2V &&

			host->caps2 & MMC_CAP2_HS200_1_2V_SDR)

		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120, 0);

		err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120);



	if (err && card->ext_csd.card_type & EXT_CSD_CARD_TYPE_SDR_1_8V &&

			host->caps2 & MMC_CAP2_HS200_1_8V_SDR)

		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, 0);

		err = __mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);



	/* If fails try again during next card power cycle */

	if (err)
@@ -1221,8 +1221,8 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, 
			 * WARNING: eMMC rules are NOT the same as SD DDR

			 */

			if (ddr == MMC_1_2V_DDR_MODE) {

				err = mmc_set_signal_voltage(host,

					MMC_SIGNAL_VOLTAGE_120, 0);

				err = __mmc_set_signal_voltage(host,

					MMC_SIGNAL_VOLTAGE_120);

				if (err)

					goto err;

			}

drivers/mmc/core/sd.c

+1 −1
Original line number Diff line number Diff line
@@ -757,7 +757,7 @@ int mmc_sd_get_cid(struct mmc_host *host, u32 ocr, u32 *cid, u32 *rocr) 
	 */

	if (!mmc_host_is_spi(host) && rocr &&

	   ((*rocr & 0x41000000) == 0x41000000)) {

		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180, true);

		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);

		if (err) {

			ocr &= ~SD_OCR_S18R;

			goto try_again;

drivers/mmc/core/sdio.c

+1 −2
Original line number Diff line number Diff line
@@ -647,8 +647,7 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr, 
	 * it.

	 */

	if ((ocr & R4_18V_PRESENT) && mmc_host_uhs(host)) {

		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,

				true);

		err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180);

		if (err) {

			ocr &= ~R4_18V_PRESENT;

			host->ocr &= ~R4_18V_PRESENT;