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fix(mbedtls/aes): fix ESP32-S2 Crypto DMA stall on PSRAM output with partial blocks

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The ESP32-S2 Crypto DMA in-channel stalls silently when a receive
descriptor list transitions from external to internal RAM. The AES
driver hits this when a PSRAM-output operation has a trailing partial
block, as the internal stream descriptor is linked after the external
RAM data descriptors.

- esp_aes_process_dma(): process the block-aligned part and the partial
  block as two separate DMA operations, keeping each descriptor list
  uniform
- crypto_dma_ll_reset(): also reset the in-channel (per the TRM receive
  reset sequence), otherwise stale state from a preceding external-RAM
  operation corrupts the next operation's output

The GCM DMA path is unaffected; it never operates on PSRAM buffers.
This commit is contained in:
harshal.patil
2026-08-19 11:27:42 +05:30
parent d9a5f9ee1c
commit 6fe4f4f174
2 changed files with 22 additions and 2 deletions
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components/esp_hal_security/esp32s2/include/hal/crypto_dma_ll.h
+2 -2
View File
@@ -70,8 +70,8 @@ static inline void crypto_dma_ll_reset_register(void)
*/
static inline void crypto_dma_ll_reset(void)
{
SET_PERI_REG_MASK(CRYPTO_DMA_CONF0_REG, CONF0_REG_AHBM_RST | CONF0_REG_OUT_RST | CONF0_REG_AHBM_FIFO_RST);
CLEAR_PERI_REG_MASK(CRYPTO_DMA_CONF0_REG, CONF0_REG_AHBM_RST | CONF0_REG_OUT_RST | CONF0_REG_AHBM_FIFO_RST);
SET_PERI_REG_MASK(CRYPTO_DMA_CONF0_REG, CONF0_REG_AHBM_RST | CONF0_REG_IN_RST | CONF0_REG_OUT_RST | CONF0_REG_AHBM_FIFO_RST);
CLEAR_PERI_REG_MASK(CRYPTO_DMA_CONF0_REG, CONF0_REG_AHBM_RST | CONF0_REG_IN_RST | CONF0_REG_OUT_RST | CONF0_REG_AHBM_FIFO_RST);
}
/**