[PATCH net] r8169: consider that PHY reset may still be in progress after applying firmware

[PATCH net] r8169: consider that PHY reset may still be in progress after applying firmware

[Heiner Kallweit]

Some firmware files trigger a PHY soft reset and don't wait for it to
be finished. PHY register writes directly after applying the firmware
may fail or provide unexpected results therefore. Fix this by waiting
for bit BMCR_RESET to be cleared after applying firmware.

There's nothing wrong with the referenced change, it's just that the
fix will apply cleanly only after this change.

Fixes: 89fbd26cca7e ("r8169: fix firmware not resetting tp->ocp_base")
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 0fa99298a..9afd1ef57 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -2055,11 +2055,18 @@ static void rtl_release_firmware(struct rtl8169_private *tp)
 
 void r8169_apply_firmware(struct rtl8169_private *tp)
 {
+	int val;
+
 	/* TODO: release firmware if rtl_fw_write_firmware signals failure. */
 	if (tp->rtl_fw) {
 		rtl_fw_write_firmware(tp, tp->rtl_fw);
 		/* At least one firmware doesn't reset tp->ocp_base. */
 		tp->ocp_base = OCP_STD_PHY_BASE;
+
+		/* PHY soft reset may still be in progress */
+		phy_read_poll_timeout(tp->phydev, MII_BMCR, val,
+				      !(val & BMCR_RESET),
+				      50000, 600000, true);
 	}
 }
 
-- 
2.28.0

Re: [PATCH net] r8169: consider that PHY reset may still be in progress after applying firmware

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (refs/heads/master):

On Wed, 7 Oct 2020 13:34:51 +0200 you wrote:
> Some firmware files trigger a PHY soft reset and don't wait for it to
> be finished. PHY register writes directly after applying the firmware
> may fail or provide unexpected results therefore. Fix this by waiting
> for bit BMCR_RESET to be cleared after applying firmware.
> 
> There's nothing wrong with the referenced change, it's just that the
> fix will apply cleanly only after this change.
> 
> [...]

Here is the summary with links:
  - [net] r8169: consider that PHY reset may still be in progress after applying firmware
    https://git.kernel.org/netdev/net/c/47dda78671a3

You are awesome, thank you!
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