[U-Boot] [PATCH] mmc: tmio: renesas: Add 1uS delay after DMA completion on older IPs

[Marek Vasut]

The internal DMAC asserts DMA transfer end bit too early on older
version of the TMIO IPs which use bit 17 for DTRAEND. Add 1uS
delay after the completion of DMA transfer and before invalidating
the cache to let the DMAC fully complete the transfer. Otherwise,
it could happen that the last few bytes of a transferred data are
not available.

A test case to trigger this behavior is the following command, ran
on the U-Boot command line, with Sandisk 16 GiB UHS-I card inserted
into SDHI slot 0 and with first partition being of type FAT:
=> while true ; do mmc rescan ; fstype mmc 0:1 ; done

Signed-off-by: Marek Vasut <marek.vasut+renesas at gmail.com>
Cc: Masahiro Yamada <yamada.masahiro at socionext.com>
---
 drivers/mmc/tmio-common.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mmc/tmio-common.c b/drivers/mmc/tmio-common.c
index 0b6a284f2e..2421915a07 100644
--- a/drivers/mmc/tmio-common.c
+++ b/drivers/mmc/tmio-common.c
@@ -367,6 +367,9 @@ static int tmio_sd_dma_xfer(struct udevice *dev, struct mmc_data *data)
 
 	ret = tmio_sd_dma_wait_for_irq(dev, poll_flag, data->blocks);
 
+	if (poll_flag == TMIO_SD_DMA_INFO1_END_RD)
+		udelay(1);
+
 	__dma_unmap_single(dma_addr, len, dir);
 
 	return ret;
-- 
2.19.2