[U-Boot] [PATCH 07/22] mmc: use mmc modes to select the correct bus speed

[Jean-Jacques Hiblot]

Signed-off-by: Jean-Jacques Hiblot <jjhib...@ti.com>
---
 drivers/mmc/mmc.c | 40 +++++++++++++++++++++++++++++-----------
 1 file changed, 29 insertions(+), 11 deletions(-)

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 5d418c5..dc7985f 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -171,9 +171,35 @@ const char *mmc_mode_name(enum bus_mode mode)
        else
                return names[mode];
 }
+
+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;
@@ -1185,13 +1211,10 @@ 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;
 }
@@ -1310,11 +1333,8 @@ 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;
 }
@@ -1584,7 +1604,6 @@ 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);
@@ -1659,7 +1678,6 @@ 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) {
-- 
1.9.1

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