diff options
| -rw-r--r-- | board/kukui/emmc.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/board/kukui/emmc.c b/board/kukui/emmc.c index 36a9256817..af2d4b1701 100644 --- a/board/kukui/emmc.c +++ b/board/kukui/emmc.c @@ -89,13 +89,15 @@ static const struct dma_option dma_rx_option = { /* Setup DMA to transfer bootblock. */ static void bootblock_transfer(void) { + static int transfer_try; + dma_chan_t *txdma = dma_get_channel(STM32_DMAC_SPI_EMMC_TX); dma_prepare_tx(&dma_tx_option, sizeof(bootblock_raw_data), bootblock_raw_data); dma_go(txdma); - CPRINTS("transfer"); + CPRINTS("transfer %d", ++transfer_try); } /* Abort an ongoing transfer. */ @@ -106,8 +108,11 @@ static void bootblock_stop(void) /* * Wait a bit to for DMA to stop writing (we can't really wait for the * buffer to get empty, as the bus may not be clocked anymore). + * + * TODO(b:117253718): For some reason, a delay >=200us is necessary, + * else the SPI/DMA skips bytes when the transfer is resumed. */ - udelay(100); + udelay(200); /* Then flush SPI FIFO, and make sure DAT line stays idle (high). */ STM32_SPI_EMMC_REGS->dr = 0xff; |