[PATCH] mmc: tmio: Check INFO1 for completion during DMA transfer

[Marek Vasut]

In case a CRC error occurs during DMA transfer, the transfer completion
flag is not set in TMIO_SD_DMA_INFO1 and the transfer would eventually
time out. The timeout could be very long in case the transfer consists
of a large amount of blocks, the base timeout is 10 seconds and every
block adds 100 us more.

In case a CRC error does occur, a completion flag is set in a different
register, TMIO_SD_INFO1. Use this other completion flag to detect DMA
transfer ended and stop waiting for TMIO_SD_DMA_INFO1 completion flag.
This reduces the lengthy timeout in case of an error. The unconditional
check of TMIO_SD_DMA_INFO2 register for DMA related errors must not be
skipped in any case to actually recognize the DMA error and report it.

Signed-off-by: Marek Vasut <marek.vasut+renesas at mailbox.org>
---
Cc: Hai Pham <hai.pham.ud at renesas.com>
Cc: Jaehoon Chung <jh80.chung at samsung.com>
Cc: Nobuhiro Iwamatsu <iwamatsu at nigauri.org>
Cc: Paul Barker <paul.barker.ct at bp.renesas.com>
Cc: Peng Fan <peng.fan at nxp.com>
Cc: Sean Anderson <seanga2 at gmail.com>
Cc: Tom Rini <trini at konsulko.com>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh at renesas.com>
---
 drivers/mmc/tmio-common.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/tmio-common.c b/drivers/mmc/tmio-common.c
index 890c496b535..719c4830bc3 100644
--- a/drivers/mmc/tmio-common.c
+++ b/drivers/mmc/tmio-common.c
@@ -299,7 +299,13 @@ static int tmio_sd_dma_wait_for_irq(struct udevice *dev, u32 flag,
 	struct tmio_sd_priv *priv = dev_get_priv(dev);
 	long wait = 1000000 + 10 * blocks;
 
-	while (!(tmio_sd_readl(priv, TMIO_SD_DMA_INFO1) & flag)) {
+	for (;;) {
+		if (tmio_sd_readl(priv, TMIO_SD_DMA_INFO1) & flag)
+			break;
+
+		if (tmio_sd_readl(priv, TMIO_SD_INFO1) & TMIO_SD_INFO1_CMP)
+			break;
+
 		if (wait-- < 0) {
 			dev_err(dev, "timeout during DMA\n");
 			return -ETIMEDOUT;
-- 
2.43.0