[openwrt/openwrt] ipq40xx: 5.15: fix ar40xx driver

[LEDE Commits]

mans0n pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/1526ccebd427051dad01c81f34e0d176697c7990

commit 1526ccebd427051dad01c81f34e0d176697c7990
Author: Nick Hainke <vincent at systemli.org>
AuthorDate: Sun May 1 21:06:52 2022 +0200

    ipq40xx: 5.15: fix ar40xx driver
    
    Also apply commit ab7e53e5cce7 ("ipq40xx: 5.10: fix ar40xx driver") to
    5.15 driver.
    
    The commit fixes the data corruption on TX packets. Packets are
    transmitted, but their contents are replaced with zeros. This error is
    caused by the lack of guard (50 ms) intervals between calibration phases.
    This error is treated by adding mdelay(50) to the calibration function
    code. In the original qca-ssda code, these mdelays were existing, but in
    the ar41xx.c they are gone.
    
    Fixes: 87318eb17936 ("ipq40xx: 5:15: copy config and patch from 5.10")
    
    Signed-off-by: Nick Hainke <vincent at systemli.org>
---
 target/linux/ipq40xx/files-5.15/drivers/net/mdio/ar40xx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/target/linux/ipq40xx/files-5.15/drivers/net/mdio/ar40xx.c b/target/linux/ipq40xx/files-5.15/drivers/net/mdio/ar40xx.c
index f7ce42b9ff..d5ef7af151 100644
--- a/target/linux/ipq40xx/files-5.15/drivers/net/mdio/ar40xx.c
+++ b/target/linux/ipq40xx/files-5.15/drivers/net/mdio/ar40xx.c
@@ -936,6 +936,7 @@ ar40xx_malibu_psgmii_ess_reset(struct ar40xx_priv *priv)
 		  */
 		mdelay(2);
 	}
+	mdelay(50);
 
 	/*check malibu psgmii calibration done end..*/
 
@@ -954,6 +955,7 @@ ar40xx_malibu_psgmii_ess_reset(struct ar40xx_priv *priv)
 		/* Polling interval to check PSGMII PLL in ESS is ready */
 		mdelay(2);
 	}
+	mdelay(50);
 
 	/* check dakota psgmii calibration done end..*/
 
@@ -961,6 +963,7 @@ ar40xx_malibu_psgmii_ess_reset(struct ar40xx_priv *priv)
 	mdiobus_write(bus, 5, 0x1a, 0x3230);
 	/* release phy psgmii RX 20bit */
 	mdiobus_write(bus, 5, 0x0, 0x005f);
+	mdelay(200);
 }
 
 static void