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During card identification, run the bus at 400KHz, not the minimum

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speed the bus claims to be capable of.  The 400KHz speed is dictated
by the SD and MMC standards.
This commit is contained in:
Ian Lepore 2013-08-16 20:32:56 +00:00
parent 9bb8ccd642
commit df736d55a1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=254427
1 changed files with 5 additions and 4 deletions
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9
sys/dev/mmc/mmc.c
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@ -106,6 +106,8 @@ struct mmc_ivars {
#define CMD_RETRIES 3
#define CARD_ID_FREQUENCY 400000 /* Spec requires 400KHz max during ID phase. */
static SYSCTL_NODE(_hw, OID_AUTO, mmc, CTLFLAG_RD, NULL, "mmc driver");
static int mmc_debug;
@ -579,7 +581,7 @@ mmc_power_up(struct mmc_softc *sc)
mmcbr_update_ios(dev);
mmc_ms_delay(1);
mmcbr_set_clock(dev, mmcbr_get_f_min(sc->dev));
mmcbr_set_clock(dev, CARD_ID_FREQUENCY);
mmcbr_set_timing(dev, bus_timing_normal);
mmcbr_set_power_mode(dev, power_on);
mmcbr_update_ios(dev);
@ -1534,7 +1536,7 @@ mmc_go_discovery(struct mmc_softc *sc)
mmc_idle_cards(sc);
} else {
mmcbr_set_bus_mode(dev, opendrain);
mmcbr_set_clock(dev, mmcbr_get_f_min(dev));
mmcbr_set_clock(dev, CARD_ID_FREQUENCY);
mmcbr_update_ios(dev);
/* XXX recompute vdd based on new cards? */
}
@ -1572,11 +1574,10 @@ static int
mmc_calculate_clock(struct mmc_softc *sc)
{
int max_dtr, max_hs_dtr, max_timing;
int nkid, i, f_min, f_max;
int nkid, i, f_max;
device_t *kids;
struct mmc_ivars *ivar;
f_min = mmcbr_get_f_min(sc->dev);
f_max = mmcbr_get_f_max(sc->dev);
max_dtr = max_hs_dtr = f_max;
if ((mmcbr_get_caps(sc->dev) & MMC_CAP_HSPEED))