[PATCH] mt76: Print error message when reading EEPROM from mtd failed

When the EEPROM data is stored on a MTD partition print an error message
when reading this MTD partition failed. This is currently happening
often in OpenWrt because the initial data was written with using a flash
driver which ignores the error detection data and now OpenWrt uses a
driver which checks it.

With this patch a better error message is shown:
[    8.986988] mt7915e 0000:01:00.0: WA Firmware Version: DEV_000000, Build Time: 20201105222323
[    9.100508] mt7915e 0000:01:00.0: reading EEPROM from mtd factory failed: -117
[    9.144289] mt7915e: probe of 0000:01:00.0 failed with error -22

mt7915 does not work without an EEPROM, MT7922 still works.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---

As an alternative we could also ignore the error EUCLEAN, which is 
printed when the error detection algorithm detected a problem.

 drivers/net/wireless/mediatek/mt76/eeprom.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mediatek/mt76/eeprom.c b/drivers/net/wireless/mediatek/mt76/eeprom.c
index 3b47e85e95e7..05579588af04 100644
--- a/drivers/net/wireless/mediatek/mt76/eeprom.c
+++ b/drivers/net/wireless/mediatek/mt76/eeprom.c

@@ -54,8 +54,11 @@ int mt76_get_of_eeprom(struct mt76_dev *dev, void *eep, int offset, int len)
 	offset = be32_to_cpup(list);
 	ret = mtd_read(mtd, offset, len, &retlen, eep);
 	put_mtd_device(mtd);
-	if (ret)
+	if (ret) {
+		dev_err(dev->dev, "reading EEPROM from mtd %s failed: %i\n",
+			part, ret);
 		goto out_put_node;
+	}
 
 	if (retlen < len) {
 		ret = -EINVAL;

-- 
2.30.2