Eric Lee / smarc-uboot

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Commit aff5d3c83fb8c294b3c4b97c5b6386306b47f1a0

Authored by Kishon Vijay Abraham I
Committed by Jaehoon Chung
1 parent 2a4d212f71
Exists in smarc_8mq_lf_v2020.04 and in 20 other branches 8qm-imx_v2020.04_5.4.70_2.3.0, emb_lf-6.6.52-2.2.0, emb_lf_v2022.04, emb_lf_v2023.04, emb_lf_v2024.04, pitx_8mp_lf_v2020.04, smarc-8m-android-10.0.0_2.6.0, smarc-8m-android-11.0.0_2.0.0, smarc-8mp-android-11.0.0_2.0.0, smarc-imx6_v2018.03_4.14.98_2.0.0_ga, smarc-imx7_v2018.03_4.14.98_2.0.0_ga, smarc-imx_v2018.03_4.14.78_1.0.0_ga, smarc_8m-imx_v2018.03_4.14.98_2.0.0_ga, smarc_8m-imx_v2019.04_4.19.35_1.1.0, smarc_8m_00d0-imx_v2018.03_4.14.98_2.0.0_ga, smarc_8mm-imx_v2018.03_4.14.98_2.0.0_ga, smarc_8mm-imx_v2019.04_4.19.35_1.1.0, smarc_8mm-imx_v2020.04_5.4.24_2.1.0, smarc_8mp_lf_v2020.04, smarc_8mq-imx_v2020.04_5.4.24_2.1.0

mmc: Enable signal voltage to be selected from mmc core 

Add a new function *mmc_set_signal_voltage* in mmc core
which can be used during mmc initialization to select the
signal voltage. Platform driver should use the set_ios
callback function to select the signal voltage.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>

Showing 2 changed files with 24 additions and 0 deletions Side-by-side Diff

... ... @@ -30,6 +30,8 @@
30 30 SZ_16M / 512, (SZ_16M + SZ_8M) / 512, SZ_32M / 512, SZ_64M / 512,
31 31 };
32 32  
  33 +static int mmc_set_signal_voltage(struct mmc *mmc, uint signal_voltage);
  34 +
33 35 #if CONFIG_IS_ENABLED(MMC_TINY)
34 36 static struct mmc mmc_static;
35 37 struct mmc *find_mmc_device(int dev_num)
... ... @@ -1257,6 +1259,12 @@
1257 1259 uint widths;
1258 1260 };
1259 1261  
  1262 +static int mmc_set_signal_voltage(struct mmc *mmc, uint signal_voltage)
  1263 +{
  1264 + mmc->signal_voltage = signal_voltage;
  1265 + return mmc_set_ios(mmc);
  1266 +}
  1267 +
1260 1268 static const struct mode_width_tuning sd_modes_by_pref[] = {
1261 1269 {
1262 1270 .mode = SD_HS,
... ... @@ -1964,6 +1972,14 @@
1964 1972 return err;
1965 1973 #endif
1966 1974 mmc->ddr_mode = 0;
  1975 +
  1976 + /* First try to set 3.3V. If it fails set to 1.8V */
  1977 + err = mmc_set_signal_voltage(mmc, MMC_SIGNAL_VOLTAGE_330);
  1978 + if (err != 0)
  1979 + err = mmc_set_signal_voltage(mmc, MMC_SIGNAL_VOLTAGE_180);
  1980 + if (err != 0)
  1981 + printf("failed to set signal voltage\n");
  1982 +
1967 1983 mmc_set_bus_width(mmc, 1);
1968 1984 mmc_set_clock(mmc, 1);
1969 1985  
... ... @@ -272,6 +272,13 @@
272 272 #define ENHNCD_SUPPORT (0x2)
273 273 #define PART_ENH_ATTRIB (0x1f)
274 274  
  275 +enum mmc_voltage {
  276 + MMC_SIGNAL_VOLTAGE_000 = 0,
  277 + MMC_SIGNAL_VOLTAGE_120,
  278 + MMC_SIGNAL_VOLTAGE_180,
  279 + MMC_SIGNAL_VOLTAGE_330
  280 +};
  281 +
275 282 /* Maximum block size for MMC */
276 283 #define MMC_MAX_BLOCK_LEN 512
277 284  
... ... @@ -457,6 +464,7 @@
457 464 int high_capacity;
458 465 uint bus_width;
459 466 uint clock;
  467 + enum mmc_voltage signal_voltage;
460 468 uint card_caps;
461 469 uint ocr;
462 470 uint dsr;