During card identification, run the bus at 400KHz, not the minimum
speed the bus claims to be capable of. The 400KHz speed is dictated by the SD and MMC standards.
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df736d55a1
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=254427
@ -106,6 +106,8 @@ struct mmc_ivars {
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#define CMD_RETRIES 3
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#define CARD_ID_FREQUENCY 400000 /* Spec requires 400KHz max during ID phase. */
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static SYSCTL_NODE(_hw, OID_AUTO, mmc, CTLFLAG_RD, NULL, "mmc driver");
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static int mmc_debug;
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@ -579,7 +581,7 @@ mmc_power_up(struct mmc_softc *sc)
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mmcbr_update_ios(dev);
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mmc_ms_delay(1);
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mmcbr_set_clock(dev, mmcbr_get_f_min(sc->dev));
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mmcbr_set_clock(dev, CARD_ID_FREQUENCY);
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mmcbr_set_timing(dev, bus_timing_normal);
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mmcbr_set_power_mode(dev, power_on);
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mmcbr_update_ios(dev);
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@ -1534,7 +1536,7 @@ mmc_go_discovery(struct mmc_softc *sc)
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mmc_idle_cards(sc);
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} else {
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mmcbr_set_bus_mode(dev, opendrain);
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mmcbr_set_clock(dev, mmcbr_get_f_min(dev));
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mmcbr_set_clock(dev, CARD_ID_FREQUENCY);
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mmcbr_update_ios(dev);
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/* XXX recompute vdd based on new cards? */
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}
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@ -1572,11 +1574,10 @@ static int
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mmc_calculate_clock(struct mmc_softc *sc)
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{
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int max_dtr, max_hs_dtr, max_timing;
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int nkid, i, f_min, f_max;
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int nkid, i, f_max;
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device_t *kids;
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struct mmc_ivars *ivar;
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f_min = mmcbr_get_f_min(sc->dev);
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f_max = mmcbr_get_f_max(sc->dev);
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max_dtr = max_hs_dtr = f_max;
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if ((mmcbr_get_caps(sc->dev) & MMC_CAP_HSPEED))
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