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Commit 49e3b5a4 authored by Adrian Hunter's avatar Adrian Hunter Committed by Chris Ball
Browse files

mmc: refine DDR support 



One flaw with DDR support is that MMC core does not inform the driver
which DDR mode it has selected.  This patch expands the ios->ddr flag
to do that.

Signed-off-by: default avatarAdrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent 0f8d8ea6

drivers/mmc/core/core.c

+4 −3
Original line number Diff line number Diff line
@@ -653,10 +653,11 @@ void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode) 
/*

 * Change data bus width and DDR mode of a host.

 */

void mmc_set_bus_width_ddr(struct mmc_host *host, unsigned int width, int ddr)

void mmc_set_bus_width_ddr(struct mmc_host *host, unsigned int width,

			   unsigned int ddr)

{

	host->ios.bus_width = width;

	host->ios.ddr = ddr ? MMC_DDR_MODE : MMC_SDR_MODE;

	host->ios.ddr = ddr;

	mmc_set_ios(host);

}
@@ -665,7 +666,7 @@ void mmc_set_bus_width_ddr(struct mmc_host *host, unsigned int width, int ddr) 
 */

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

{

	mmc_set_bus_width_ddr(host, width, 0);

	mmc_set_bus_width_ddr(host, width, MMC_SDR_MODE);

}



/**

drivers/mmc/core/core.h

+2 −1
Original line number Diff line number Diff line
@@ -35,7 +35,8 @@ void mmc_set_chip_select(struct mmc_host *host, int mode); 
void mmc_set_clock(struct mmc_host *host, unsigned int hz);

void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode);

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

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

void mmc_set_bus_width_ddr(struct mmc_host *host, unsigned int width,

			   unsigned int ddr);

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

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

drivers/mmc/core/mmc.c

+3 −3
Original line number Diff line number Diff line
@@ -375,7 +375,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, 
	struct mmc_card *oldcard)

{

	struct mmc_card *card;

	int err, ddr = 0;

	int err, ddr = MMC_SDR_MODE;

	u32 cid[4];

	unsigned int max_dtr;
@@ -523,10 +523,10 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr, 
	if (mmc_card_highspeed(card)) {

		if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)

			&& (host->caps & (MMC_CAP_1_8V_DDR)))

				ddr = 1;

				ddr = MMC_1_8V_DDR_MODE;

		else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)

			&& (host->caps & (MMC_CAP_1_2V_DDR)))

				ddr = 1;

				ddr = MMC_1_2V_DDR_MODE;

	}



	/*

include/linux/mmc/host.h

+2 −1
Original line number Diff line number Diff line
@@ -54,7 +54,8 @@ struct mmc_ios { 
	unsigned char	ddr;			/* dual data rate used */



#define MMC_SDR_MODE		0

#define MMC_DDR_MODE		1

#define MMC_1_2V_DDR_MODE	1

#define MMC_1_8V_DDR_MODE	2

};



struct mmc_host_ops {