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Code Issues Releases Activity

fusee: correct computation of tuning block size

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This commit is contained in:
Kate J. Temkin 2018-05-20 07:21:49 -06:00
parent d5411b5b1f
commit add03d5774
2 changed files with 10 additions and 11 deletions
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20
fusee/fusee-primary/src/sdmmc.c
View file

@ -463,8 +463,11 @@ enum sdmmc_command_magic {
MMC_DEFAULT_BLOCK_ORDER = 9,
MMC_VOLTAGE_SWITCH_TIME = 5000, // 5mS
MMC_POST_CLOCK_DELAY = 1000, // 1mS
MMC_TUNING_TIMEOUT = 150 * 1000, // 150mS
MMC_SPEED_MMC_OFFSET = 10,
MMC_TUNING_TIMEOUT = 150 * 1000, // 150mS
MMC_TUNING_BLOCK_ORDER_4BIT = 6,
MMC_TUNING_BLOCK_ORDER_8BIT = 7,
};
@ -1208,18 +1211,12 @@ static int sdmmc_tune_clock(struct mmc *mmc, enum sdmmc_tuning_attempts iteratio
// Stores the current timeout; we'll restore it in a bit.
int original_timeout = mmc->timeout;
// Figure out the block order to be used for communciations.
// XXX: where does this come from
int target_block_order = 6;
// The SDMMC host spec suggests tuning should occur over 40 iterations, so we'll stick to that.
// Vendors seem to deviate from this, so this is a possible area to look into if something doesn't
// wind up working correctly.
int attempts_remaining = sdmmc_tuning_iterations[iterations];
mmc_debug(mmc, "executing tuning (%d iterations)", attempts_remaining);
// These values come from the vendor's recommended values in the TRM.
// Allow the tuning hardware to control e.g. our clock taps.
mmc->regs->vendor_tuning_cntrl0 |= MMC_VENDOR_TUNING_SET_BY_HW;
@ -1239,7 +1236,7 @@ static int sdmmc_tune_clock(struct mmc *mmc, enum sdmmc_tuning_attempts iteratio
// Momentarily step down to a smaller block size, so we don't
// have to allocate a huge buffer for this command.
mmc->read_block_order = target_block_order;
mmc->read_block_order = mmc->tuning_block_order;
// Step down to the timeout recommended in the specification.
mmc->timeout = MMC_TUNING_TIMEOUT;
@ -2773,11 +2770,10 @@ static int sdmmc_mmc_optimize_speed(struct mmc *mmc)
if (mmc->operating_voltage == MMC_VOLTAGE_1V8) {
//if (hs400_support && !sdmmc_switch_bus_speed(mmc, SDMMC_SPEED_HS400))
// return 0;
//if (hs200_support && !sdmmc_switch_bus_speed(mmc, SDMMC_SPEED_HS200))
// return 0;
if (hs200_support && !sdmmc_switch_bus_speed(mmc, SDMMC_SPEED_HS200))
return 0;
(void)hs400_support;
(void)hs200_support;
}
// Next, try the legacy "high speed" mode.
@ -3310,6 +3306,7 @@ static int sdmmc_initialize_defaults(struct mmc *mmc)
case SWITCH_EMMC:
mmc->name = "eMMC";
mmc->max_bus_width = MMC_BUS_WIDTH_8BIT;
mmc->tuning_block_order = MMC_TUNING_BLOCK_ORDER_8BIT;
mmc->operating_voltage = MMC_VOLTAGE_1V8;
// Set up function pointers for each of our per-instance functions.
@ -3330,6 +3327,7 @@ static int sdmmc_initialize_defaults(struct mmc *mmc)
mmc->name = "uSD";
mmc->card_type = MMC_CARD_SD;
mmc->max_bus_width = SD_BUS_WIDTH_4BIT;
mmc->tuning_block_order = MMC_TUNING_BLOCK_ORDER_4BIT;
mmc->operating_voltage = MMC_VOLTAGE_3V3;
mmc->card_detect_gpio = GPIO_MICROSD_CARD_DETECT;

1
fusee/fusee-primary/src/sdmmc.h
View file

@ -188,6 +188,7 @@ struct mmc {
uint8_t read_block_order;
uint8_t write_block_order;
uint8_t tuning_block_order;
bool uses_block_addressing;
/* Current operation status flags */