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mmc: refine DDR support

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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: Adrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Adrian Hunter 2010-10-11 12:43:50 +03:00 committed by Chris Ball
parent 0f8d8ea64e
commit 49e3b5a44f
4 changed files with 11 additions and 8 deletions
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7
drivers/mmc/core/core.c
View File

@ -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);
}
/**

3
drivers/mmc/core/core.h
View File

@ -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);

6
drivers/mmc/core/mmc.c
View File

@ -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;
}
/*

3
include/linux/mmc/host.h
View File

@ -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 {