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driver/spi: STM32 Revert while loop on tx only

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This commit reverted while loop on tx only.
This commit solves SPI loopback failure and SPI wrong behaviour on RX.
fix:
* zephyrproject-rtos/zephyr#35297
* zephyrproject-rtos/zephyr#35539

Revert "drivers/spi: STM32: This solves SPI infinite loop on Tranceive"

This reverts commit 50c2acbc03e7a48a09880b6fcb8c22256bffa70c.

Signed-off-by: Affrin Pinhero <affrin.pinhero@hcl.com>
This commit is contained in:
Affrin Pinhero 2021-05-26 13:23:42 +05:30 • committed by Kumar Gala
commit c1daae647e
1 changed files with 2 additions and 8 deletions
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10
drivers/spi/spi_ll_stm32.c
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@ -294,14 +294,8 @@ static void spi_stm32_shift_m(SPI_TypeDef *spi, struct spi_stm32_data *data)
spi_context_update_tx(&data->ctx, 2, 1);
}
if (data->ctx.rx_buf) {
while (!ll_func_rx_is_not_empty(spi)) {
/* NOP */
}
} else {
while (!ll_func_tx_is_empty(spi)) {
/* NOP */
}
while (!ll_func_rx_is_not_empty(spi)) {
/* NOP */
}
if (SPI_WORD_SIZE_GET(data->ctx.config->operation) == 8) {