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xtensa/esp32: Fix buffer size word-alignment for DMA transfers

This commit is contained in:
Gustavo Henrique Nihei 2021-03-19 16:10:56 -03:00 committed by Xiang Xiao
parent bfc551484a
commit 27e2da33b4
1 changed files with 8 additions and 1 deletions
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9
arch/xtensa/src/esp32/esp32_dma.c
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@ -72,6 +72,7 @@ uint32_t esp32_dma_init(struct esp32_dmadesc_s *dmadesc, uint32_t num,
uint32_t bytes = len;
uint8_t *pdata = pbuf;
uint32_t data_len;
uint32_t buf_len;
DEBUGASSERT(dmadesc != NULL);
DEBUGASSERT(pbuf != NULL);
@ -81,8 +82,14 @@ uint32_t esp32_dma_init(struct esp32_dmadesc_s *dmadesc, uint32_t num,
{
data_len = MIN(bytes, ESP32_DMA_DATALEN_MAX);
/* Round the number of bytes to the nearest word, since the buffer
* length must be word-aligned.
*/
buf_len = (data_len + sizeof(uintptr_t) - 1) / sizeof(uintptr_t);
dmadesc[i].ctrl = (data_len << DMA_CTRL_DATALEN_S) |
(data_len << DMA_CTRL_BUFLEN_S) |
(buf_len << DMA_CTRL_BUFLEN_S) |
DMA_CTRL_OWN;
dmadesc[i].pbuf = pdata;
dmadesc[i].next = &dmadesc[i + 1];