From: Cooper Jr., Franklin <fcooper@ti.com>
Date: Thu, 20 Apr 2017 15:25:45 +0000 (-0500)
Subject: ti: common: board_detect: Set alen to expected value before i2c read
X-Git-Url: http://git.dujemihanovic.xyz/%22http:/www.sics.se/static/git-logo.png?a=commitdiff_plain;h=e25ae3224f0119bf65eac8bf4e15e887e29940e8;p=u-boot.git

ti: common: board_detect: Set alen to expected value before i2c read

In non DM I2C read operations the address length passed in during a read
operation will be used automatically. However, in DM I2C the address length
is set to a default value of one which causes problems when trying to
perform a read with a differing alen. Therefore, before the first read in a
series of read operations set the alen to the correct value.

Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
---

diff --git a/board/ti/common/board_detect.c b/board/ti/common/board_detect.c
index 1e695f4256..6fdcb6172c 100644
--- a/board/ti/common/board_detect.c
+++ b/board/ti/common/board_detect.c
@@ -83,7 +83,17 @@ static int __maybe_unused ti_i2c_eeprom_init(int i2c_bus, int dev_addr)
 static int __maybe_unused ti_i2c_eeprom_read(int dev_addr, int offset,
 					     uchar *ep, int epsize)
 {
-	return i2c_read(dev_addr, offset, 2, ep, epsize);
+	int bus_num, rc, alen;
+
+	bus_num = i2c_get_bus_num();
+
+	alen = 2;
+
+	rc = ti_i2c_set_alen(bus_num, dev_addr, alen);
+	if (rc)
+		return rc;
+
+	return i2c_read(dev_addr, offset, alen, ep, epsize);
 }
 
 /**
@@ -125,6 +135,11 @@ static int __maybe_unused ti_i2c_eeprom_get(int bus_addr, int dev_addr,
 	 * Read the header first then only read the other contents.
 	 */
 	byte = 2;
+
+	rc = ti_i2c_set_alen(bus_addr, dev_addr, byte);
+	if (rc)
+		return rc;
+
 	rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read, 4);
 	if (rc)
 		return rc;
@@ -137,9 +152,14 @@ static int __maybe_unused ti_i2c_eeprom_get(int bus_addr, int dev_addr,
 		 * 1 byte address (some legacy boards need this..)
 		 */
 		byte = 1;
-		if (rc)
+		if (rc) {
+			rc = ti_i2c_set_alen(bus_addr, dev_addr, byte);
+			if (rc)
+				return rc;
+
 			rc = i2c_read(dev_addr, 0x0, byte, (uint8_t *)&hdr_read,
 				      4);
+		}
 		if (rc)
 			return rc;
 	}