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imxrt/lpspi: Fix correct LPSPI DMA transfer size for 16-bit

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- Fix byte count calculation for 16-bit SPI words
  using shift-by-1 instead of shift-by-2
- Use word count instead of byte count for DMA
  iteration config on both RX and TX channels

Signed-off-by: Atsunori Saito <sai@yedo.com>
This commit is contained in:
Atsunori Saito
2026-02-17 14:10:32 +09:00
committed by Alan C. Assis
parent b4242042e1
commit fc1ae9b7be
1 changed files with 3 additions and 3 deletions
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arch/arm/src/imxrt/imxrt_lpspi.c
+3 -3
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@@ -1475,7 +1475,7 @@ static void imxrt_lpspi_exchange(struct spi_dev_s *dev,
/* Convert the number of word to a number of bytes */
nbytes = (priv->nbits > 8) ? nwords << 2 : nwords;
nbytes = (priv->nbits > 8) ? nwords << 1 : nwords;
/* Invalid DMA channels fall back to non-DMA method. */
@@ -1526,7 +1526,7 @@ static void imxrt_lpspi_exchange(struct spi_dev_s *dev,
config.daddr = (uint32_t) (rxbuffer ? rxbuffer : rxdummy);
config.soff = 0;
config.doff = rxbuffer ? adjust : 0;
config.iter = nbytes;
config.iter = nwords;
config.flags = EDMA_CONFIG_LINKTYPE_LINKNONE;
config.ssize = adjust == 1 ? EDMA_8BIT : EDMA_16BIT;
config.dsize = adjust == 1 ? EDMA_8BIT : EDMA_16BIT;
@@ -1540,7 +1540,7 @@ static void imxrt_lpspi_exchange(struct spi_dev_s *dev,
config.daddr = priv->spibase + IMXRT_LPSPI_TDR_OFFSET;
config.soff = txbuffer ? adjust : 0;
config.doff = 0;
config.iter = nbytes;
config.iter = nwords;
config.flags = EDMA_CONFIG_LINKTYPE_LINKNONE;
config.ssize = adjust == 1 ? EDMA_8BIT : EDMA_16BIT;
config.dsize = adjust == 1 ? EDMA_8BIT : EDMA_16BIT;