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<blockquote type="cite">On 6 Apr 2023, at 1:02 AM, Guenter Roeck <linux@roeck-us.net> wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr"><span>Hi,</span><br>
<span></span><br>
<span>On Fri, Mar 24, 2023 at 04:16:55PM +0800, Michael Sit Wei Hong wrote:</span><br>
<blockquote type="cite"><span>After the introduction of the fixed-link support, the MAC driver</span><br>
</blockquote>
<blockquote type="cite"><span>no longer attempt to scan for a PHY to attach to. This causes the</span><br>
</blockquote>
<blockquote type="cite"><span>non fixed-link setups to stop working.</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>Using the phylink_expects_phy() to check and determine if the MAC</span><br>
</blockquote>
<blockquote type="cite"><span>should expect and attach a PHY.</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>Fixes: ab21cf920928 ("net: stmmac: make mdio register skips PHY scanning for fixed-link")</span><br>
</blockquote>
<blockquote type="cite"><span>Signed-off-by: Michael Sit Wei Hong <michael.wei.hong.sit@intel.com></span><br>
</blockquote>
<blockquote type="cite"><span>Signed-off-by: Lai Peter Jun Ann <peter.jun.ann.lai@intel.com></span><br>
</blockquote>
<span></span><br>
<span>With this patch in linux-next, the orangepi-pc qemu emulation fails to</span><br>
<span>bring up the Ethernet interface. The following error is seen.</span><br>
<span></span><br>
<span>[   12.482401] dwmac-sun8i 1c30000.ethernet eth0: Register MEM_TYPE_PAGE_POOL RxQ-0</span><br>
<span>[   12.487789] dwmac-sun8i 1c30000.ethernet eth0: PHY [mdio_mux-0.1:01] driver [Generic PHY] (irq=POLL)</span><br>
<span>[   12.488177] dwmac-sun8i 1c30000.ethernet eth0: no phy found</span><br>
<span>[   12.488295] dwmac-sun8i 1c30000.ethernet eth0: __stmmac_open: Cannot attach to PHY (error: -19)</span><br>
<span></span><br>
<span>Reverting this patch fixes the problem.</span><br>
<span></span><br>
<blockquote type="cite"><span>---</span><br>
</blockquote>
<blockquote type="cite"><span>drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 +++-</span><br>
</blockquote>
<blockquote type="cite"><span>1 file changed, 3 insertions(+), 1 deletion(-)</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c</span><br>
</blockquote>
<blockquote type="cite"><span>index 8f543c3ab5c5..41f0f3b74933 100644</span><br>
</blockquote>
<blockquote type="cite"><span>--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c</span><br>
</blockquote>
<blockquote type="cite"><span>+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c</span><br>
</blockquote>
<blockquote type="cite"><span>@@ -1135,6 +1135,7 @@ static int stmmac_init_phy(struct net_device *dev)</span><br>
</blockquote>
<blockquote type="cite"><span>{</span><br>
</blockquote>
<blockquote type="cite"><span>   struct stmmac_priv *priv = netdev_priv(dev);</span><br>
</blockquote>
<blockquote type="cite"><span>   struct fwnode_handle *fwnode;</span><br>
</blockquote>
<blockquote type="cite"><span>+    bool phy_needed;</span><br>
</blockquote>
<blockquote type="cite"><span>   int ret;</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>   fwnode = of_fwnode_handle(priv->plat->phylink_node);</span><br>
</blockquote>
<blockquote type="cite"><span>@@ -1144,10 +1145,11 @@ static int stmmac_init_phy(struct net_device *dev)</span><br>
</blockquote>
<blockquote type="cite"><span>   if (fwnode)</span><br>
</blockquote>
<blockquote type="cite"><span>       ret = phylink_fwnode_phy_connect(priv->phylink, fwnode, 0);</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>+    phy_needed = phylink_expects_phy(priv->phylink);</span><br>
</blockquote>
<blockquote type="cite"><span>   /* Some DT bindings do not set-up the PHY handle. Let's try to</span><br>
</blockquote>
<blockquote type="cite"><span>    * manually parse it</span><br>
</blockquote>
<blockquote type="cite"><span>    */</span><br>
</blockquote>
<blockquote type="cite"><span>-    if (!fwnode || ret) {</span><br>
</blockquote>
<blockquote type="cite"><span>+    if (!fwnode || phy_needed || ret) {</span><br>
</blockquote>
<span></span><br>
<span>I don't really understand this condition. It starts taking this path even if ret == 0</span><br>
<span>and fwnode != NULL if phy_needed is set. That means this path is now taken even if</span><br>
<span>phylink_fwnode_phy_connect() returned no error. That seems odd.</span><br>
<span></span><br>
<span>Guenter</span><br>
<span></span><br>
</div>
</blockquote>
Please try the patch here
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</tbody>
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</td>
</tr>
</tbody>
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</a></div>
</div>
<br>
<blockquote type="cite">
<div dir="ltr">
<blockquote type="cite"><span>       int addr = priv->plat->phy_addr;</span><br>
</blockquote>
<blockquote type="cite"><span>       struct phy_device *phydev;</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
<blockquote type="cite"><span>-- </span><br>
</blockquote>
<blockquote type="cite"><span>2.34.1</span><br>
</blockquote>
<blockquote type="cite"><span></span><br>
</blockquote>
</div>
</blockquote>
</div>
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