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bsp/imx: Allow gapless SPI transfers.

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This uses the tx-threshold to reduce gaps in SPI transmissions.

Update #3869.
This commit is contained in:
Christian Mauderer
2020-02-10 10:35:15 +01:00
parent 9c7bffb541
commit d00d690557
1 changed files with 6 additions and 1 deletions
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7
bsps/arm/imx/spi/imx-ecspi.c
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@@ -174,12 +174,14 @@ static void imx_ecspi_config(
uint32_t conreg;
uint32_t testreg;
uint32_t configreg;
uint32_t dmareg;
uint32_t cs_bit;
conreg = IMX_ECSPI_CONREG_CHANNEL_MODE(0xf)
| IMX_ECSPI_CONREG_SMC | IMX_ECSPI_CONREG_EN;
testreg = regs->testreg;
configreg = regs->configreg;
dmareg = regs->dmareg;
cs_bit = 1U << cs;
conreg |= imx_ecspi_conreg_divider(bus, speed_hz);
@@ -213,8 +215,11 @@ static void imx_ecspi_config(
testreg &= ~IMX_ECSPI_TESTREG_LBC;
}
dmareg = IMX_ECSPI_DMAREG_TX_THRESHOLD_SET(dmareg, IMX_ECSPI_FIFO_SIZE/2);
regs->conreg = conreg;
regs->testreg = testreg;
regs->dmareg = dmareg;
regs->configreg = configreg;
bus->conreg = conreg;
@@ -287,7 +292,7 @@ static void imx_ecspi_next_msg(imx_ecspi_bus *bus, volatile imx_ecspi *regs)
bus->tx_buf = msg->tx_buf;
imx_ecspi_set_push_pop(bus, msg->len, msg->bits_per_word);
imx_ecspi_push(bus, regs);
regs->intreg = IMX_ECSPI_TE;
regs->intreg = IMX_ECSPI_TE | IMX_ECSPI_TDR;
} else {
regs->intreg = 0;
imx_ecspi_done(bus);