[U-Boot] [PATCH] mvebu: turris_omnia: Fix PEX vs SATA detection for board topology

[Marek Behún]

The I2C reading in the PEX vs SATA detection code often fails on the
first try. Try three times, as the code for EEPROM reading does.

Signed-off-by: Marek Behun <marek.behun at nic.cz>
---
 board/CZ.NIC/turris_omnia/turris_omnia.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/board/CZ.NIC/turris_omnia/turris_omnia.c b/board/CZ.NIC/turris_omnia/turris_omnia.c
index 86926f8050..a4275091d2 100644
--- a/board/CZ.NIC/turris_omnia/turris_omnia.c
+++ b/board/CZ.NIC/turris_omnia/turris_omnia.c
@@ -90,7 +90,7 @@ static struct serdes_map board_serdes_map_sata[] = {
 static bool omnia_detect_sata(void)
 {
 	struct udevice *bus, *dev;
-	int ret;
+	int ret, retry = 3;
 	u16 mode;
 
 	puts("SERDES0 card detect: ");
@@ -106,8 +106,13 @@ static bool omnia_detect_sata(void)
 		return false;
 	}
 
-	ret = dm_i2c_read(dev, OMNIA_I2C_MCU_ADDR_STATUS, (uchar *) &mode, 2);
-	if (ret) {
+	for (; retry > 0; --retry) {
+		ret = dm_i2c_read(dev, OMNIA_I2C_MCU_ADDR_STATUS, (uchar *) &mode, 2);
+		if (!ret)
+			break;
+	}
+
+	if (!retry) {
 		puts("I2C read failed! Default PEX\n");
 		return false;
 	}
-- 
2.13.0