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mmc: use mmc modes to select the correct bus speed

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Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Jean-Jacques Hiblot 2017-09-21 16:29:55 +02:00 committed by Jaehoon Chung
parent 4c9d2aaa7e
commit 05038576e0
1 changed files with 28 additions and 11 deletions
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39
drivers/mmc/mmc.c
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@ -174,9 +174,34 @@ const char *mmc_mode_name(enum bus_mode mode)
}
#endif
static uint mmc_mode2freq(struct mmc *mmc, enum bus_mode mode)
{
static const int freqs[] = {
[SD_LEGACY] = 25000000,
[MMC_HS] = 26000000,
[SD_HS] = 50000000,
[UHS_SDR12] = 25000000,
[UHS_SDR25] = 50000000,
[UHS_SDR50] = 100000000,
[UHS_SDR104] = 208000000,
[UHS_DDR50] = 50000000,
[MMC_HS_52] = 52000000,
[MMC_DDR_52] = 52000000,
[MMC_HS_200] = 200000000,
};
if (mode == MMC_LEGACY)
return mmc->legacy_speed;
else if (mode >= MMC_MODES_END)
return 0;
else
return freqs[mode];
}
static int mmc_select_mode(struct mmc *mmc, enum bus_mode mode)
{
mmc->selected_mode = mode;
mmc->tran_speed = mmc_mode2freq(mmc, mode);
debug("selecting mode %s (freq : %d MHz)\n", mmc_mode_name(mode),
mmc->tran_speed / 1000000);
return 0;
@ -1195,13 +1220,10 @@ static int sd_select_bus_freq_width(struct mmc *mmc)
if (err)
return err;
if (mmc->card_caps & MMC_MODE_HS) {
if (mmc->card_caps & MMC_MODE_HS)
mmc_select_mode(mmc, SD_HS);
mmc->tran_speed = 50000000;
} else {
else
mmc_select_mode(mmc, SD_LEGACY);
mmc->tran_speed = 25000000;
}
return 0;
}
@ -1323,11 +1345,8 @@ static int mmc_select_bus_freq_width(struct mmc *mmc)
mmc_select_mode(mmc, MMC_DDR_52);
else
mmc_select_mode(mmc, MMC_HS_52);
mmc->tran_speed = 52000000;
} else if (mmc->card_caps & MMC_MODE_HS) {
} else if (mmc->card_caps & MMC_MODE_HS)
mmc_select_mode(mmc, MMC_HS);
mmc->tran_speed = 26000000;
}
return err;
}
@ -1599,7 +1618,6 @@ static int mmc_startup(struct mmc *mmc)
mult = multipliers[((cmd.response[0] >> 3) & 0xf)];
mmc->legacy_speed = freq * mult;
mmc->tran_speed = mmc->legacy_speed;
mmc_select_mode(mmc, MMC_LEGACY);
mmc->dsr_imp = ((cmd.response[1] >> 12) & 0x1);
@ -1674,7 +1692,6 @@ static int mmc_startup(struct mmc *mmc)
if (err)
return err;
mmc_set_clock(mmc, mmc->tran_speed);
/* Fix the block length for DDR mode */
if (mmc->ddr_mode) {