[PATCH 02/16] board: traverse: ten64: ensure retimer reset is done on new board revisions

[Mathew McBride]

Board revision C (production) and later require the SFP+
retimer to be turned on (or reset) on boot, by way of issuing
a command to the board's microcontroller (via I2C).

The comparison statement here was incorrect, as the board
ID decrements every revision (from 0xFF downwards),
so this was matching board RevA,B,C instead of Rev >= C.

Another oops that transpired when working on this issue,
is that if the board controller is not called (such as
CONFIG_TEN64_CONTROLLER=n or earlier board rev), then
the retimer udevice was not obtained. So the board
version check has to be moved inside board_cycle_retimer
(which probes/fetches the retimer device) as well.

Signed-off-by: Mathew McBride <matt at traverse.com.au>
---
 board/traverse/ten64/ten64.c | 37 ++++++++++++++++++------------------
 1 file changed, 19 insertions(+), 18 deletions(-)

diff --git a/board/traverse/ten64/ten64.c b/board/traverse/ten64/ten64.c
index 88f22e85d7..df44baf24f 100644
--- a/board/traverse/ten64/ten64.c
+++ b/board/traverse/ten64/ten64.c
@@ -341,20 +341,27 @@ static int board_cycle_retimer(struct udevice **retim_dev)
 	u8 loop;
 	struct udevice *uc_dev;
 	struct udevice *i2cbus;
+	u32 board_rev = ten64_get_board_rev();
 
 	ret = ten64_get_micro_udevice(&uc_dev, &i2cbus);
 	if (ret)
 		return ret;
 
-	ret = dm_i2c_probe(i2cbus, I2C_RETIMER_ADDR, 0, retim_dev);
-	if (ret == 0) {
-		puts("(retimer on, resetting...) ");
+	/* Retimer power cycle not implemented on early board
+	 * revisions/controller firmwares
+	 */
+	if (IS_ENABLED(CONFIG_TEN64_CONTROLLER) &&
+	    board_rev <= TEN64_BOARD_REV_C) {
+		ret = dm_i2c_probe(i2cbus, I2C_RETIMER_ADDR, 0, retim_dev);
+		if (ret == 0) {
+			puts("(retimer on, resetting...) ");
 
-		ret = misc_call(uc_dev, TEN64_CNTRL_10G_OFF, NULL, 0, NULL, 0);
-		mdelay(1000);
-	}
+			ret = misc_call(uc_dev, TEN64_CNTRL_10G_OFF, NULL, 0, NULL, 0);
+			mdelay(1000);
+		}
 
-	ret = misc_call(uc_dev, TEN64_CNTRL_10G_ON, NULL, 0, NULL, 0);
+		ret = misc_call(uc_dev, TEN64_CNTRL_10G_ON, NULL, 0, NULL, 0);
+	}
 
 	// Wait for retimer to come back
 	for (loop = 0; loop < 5; loop++) {
@@ -375,19 +382,13 @@ static void ten64_board_retimer_ds110df410_init(void)
 	u8 reg;
 	int ret;
 	struct udevice *retim_dev;
-	u32 board_rev = ten64_get_board_rev();
 
 	puts("Retimer: ");
-	/* Retimer power cycle not implemented on early board
-	 * revisions/controller firmwares
-	 */
-	if (IS_ENABLED(CONFIG_TEN64_CONTROLLER) &&
-	    board_rev >= TEN64_BOARD_REV_C) {
-		ret = board_cycle_retimer(&retim_dev);
-		if (ret) {
-			puts("Retimer power on failed\n");
-			return;
-		}
+
+	ret = board_cycle_retimer(&retim_dev);
+	if (ret) {
+		puts("Retimer power on failed\n");
+		return;
 	}
 
 	/* Access to Control/Shared register */
-- 
2.30.1