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sdmmc: I/O phase adjustments

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1. Fix incorrect meaning of SDMMC.clock bits, synchronize the names
   with the TRM.
2. Choose input and output phases to satisfy typical timing
   requirements.
3. Move use_hold_reg setting into the host driver, since it is related
   to timing.

Closes https://github.com/espressif/esp-idf/issues/8521
Related to https://github.com/espressif/esp-idf/issues/8257
This commit is contained in:
Ivan Grokhotkov
2022-03-12 00:53:43 +01:00
committed by Armando
parent ad46b43c2c
commit e9badf51c7
4 changed files with 21 additions and 23 deletions
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35
components/driver/sdmmc/sdmmc_host.c
View File

@@ -116,33 +116,29 @@ esp_err_t sdmmc_host_reset(void)
static void sdmmc_host_set_clk_div(int div)
{
// Set frequency to 160MHz / div
// div = p + 1
// duty cycle = (h + 1)/(p + 1) (should be = 1/2)
// div = l + 1
// duty cycle = (h + 1)/(l + 1) (should be = 1/2)
assert (div > 1 && div <= 16);
int p = div - 1;
int l = div - 1;
int h = div / 2 - 1;
SDMMC.clock.div_factor_p = p;
SDMMC.clock.div_factor_h = h;
SDMMC.clock.div_factor_m = p;
SDMMC.clock.div_factor_l = l;
SDMMC.clock.div_factor_n = l;
// Make sure 160 MHz source clock is used
#if SOC_SDMMC_SUPPORT_XTAL_CLOCK
SDMMC.clock.clk_sel = 1;
#endif
#if SOC_SDMMC_USE_GPIO_MATRIX
// 90 degree phase on input and output clocks
const int inout_clock_phase = 1;
#else
// 180 degree phase on input and output clocks
const int inout_clock_phase = 4;
#endif
// Set phases for in/out clocks
SDMMC.clock.phase_dout = inout_clock_phase;
SDMMC.clock.phase_din = inout_clock_phase;
SDMMC.clock.phase_core = 0;
// Wait for the clock to propagate
esp_rom_delay_us(10);
/* 90 deg. delay for cclk_out to satisfy large hold time for SDR12 (up to 25MHz) and SDR25 (up to 50MHz) modes.
* Whether this delayed clock will be used depends on use_hold_reg bit in CMD structure,
* determined when sending out the command.
*/
SDMMC.clock.phase_dout = 1;
SDMMC.clock.phase_din = 0;
esp_rom_delay_us(1);
}
static void sdmmc_host_input_clk_disable(void)
@@ -300,7 +296,7 @@ esp_err_t sdmmc_host_get_real_freq(int slot, int* real_freq_khz)
return ESP_ERR_INVALID_ARG;
}
int host_div = SDMMC.clock.div_factor_p + 1;
int host_div = SDMMC.clock.div_factor_l + 1;
int card_div = slot == 0 ? SDMMC.clkdiv.div0 : SDMMC.clkdiv.div1;
*real_freq_khz = sdmmc_host_calc_freq(host_div, card_div);
@@ -317,6 +313,9 @@ esp_err_t sdmmc_host_start_command(int slot, sdmmc_hw_cmd_t cmd, uint32_t arg) {
if (cmd.data_expected && cmd.rw && (SDMMC.wrtprt.cards & BIT(slot)) != 0) {
return ESP_ERR_INVALID_STATE;
}
/* Outputs should be synchronized to cclk_out */
cmd.use_hold_reg = 1;
int64_t t0 = esp_timer_get_time();
while (SDMMC.cmd.start_command == 1) {
if (esp_timer_get_time() - t0 > SDMMC_HOST_START_CMD_TIMEOUT_US) {

1
components/driver/sdmmc/sdmmc_transaction.c
View File

@@ -305,7 +305,6 @@ static sdmmc_hw_cmd_t make_hw_cmd(sdmmc_command_t* cmd)
if (cmd->flags & SCF_RSP_CRC) {
res.check_response_crc = 1;
}
res.use_hold_reg = 1;
if (cmd->data) {
res.data_expected = 1;
if ((cmd->flags & SCF_CMD_READ) == 0) {