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fusee: actually obey the SD spec when switching voltage

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This commit is contained in:
Kate J. Temkin 2018-05-10 07:10:37 -07:00
parent 5b5aa38486
commit 402b69c549
1 changed files with 8 additions and 1 deletions
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9
fusee/fusee-primary/src/sdmmc.c
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@ -321,6 +321,8 @@ enum sdmmc_command_magic {
/* Misc constants */ /* Misc constants */
MMC_DEFAULT_BLOCK_ORDER = 9, MMC_DEFAULT_BLOCK_ORDER = 9,
MMC_VOLTAGE_SWITCH_TIME = 5000, // 5mS
MMC_POST_CLOCK_DELAY = 1000, // 1mS
}; };
@ -789,12 +791,17 @@ static int sdmmc1_switch_to_low_voltage(struct mmc *mmc)
} }
// Rerun the main clock calibration... // Rerun the main clock calibration...
rc = sdmmc_run_autocal(mmc, true); rc = sdmmc_run_autocal(mmc, false);
if (rc) if (rc)
mmc_print(mmc, "WARNING: failed to re-calibrate after voltage switch!"); mmc_print(mmc, "WARNING: failed to re-calibrate after voltage switch!");
// ... and ensure the host is set up to apply the relevant change. // ... and ensure the host is set up to apply the relevant change.
sdmmc_set_working_voltage(mmc, MMC_VOLTAGE_1V8); sdmmc_set_working_voltage(mmc, MMC_VOLTAGE_1V8);
udelay(MMC_VOLTAGE_SWITCH_TIME);
// Enable the SD clock.
sdmmc_clock_enable(mmc, true);
udelay(MMC_POST_CLOCK_DELAY);
mmc_debug(mmc, "now running from 1V8"); mmc_debug(mmc, "now running from 1V8");
return 0; return 0;