This bit is necessary to enable packets on the interface. Without this
bit set, ethernet behaves as if it is working but no activity occurs.

The vendor SDK sets this bit along with the PHY_ID bits. u-boot will set
this bit as well but if u-boot is not compiled with networking, the
interface will not work.

Fixes: 9a24e1ff4326 ("net: mdio: add amlogic gxl mdio mux support");

Signed-off-by: Da Xue <da@libre.computer>
---
 drivers/net/mdio/mdio-mux-meson-gxl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mdio/mdio-mux-meson-gxl.c
b/drivers/net/mdio/mdio-mux-meson-gxl.c
index 89554021b5cc..b2bd57f54034 100644
--- a/drivers/net/mdio/mdio-mux-meson-gxl.c
+++ b/drivers/net/mdio/mdio-mux-meson-gxl.c
@@ -17,6 +17,7 @@
 #define  REG2_LEDACT GENMASK(23, 22)
 #define  REG2_LEDLINK GENMASK(25, 24)
 #define  REG2_DIV4SEL BIT(27)
+#define  REG2_RESERVED_28 BIT(28)
 #define  REG2_ADCBYPASS BIT(30)
 #define  REG2_CLKINSEL BIT(31)
 #define ETH_REG3 0x4
@@ -65,7 +66,7 @@ static void gxl_enable_internal_mdio(struct
gxl_mdio_mux *priv)
  * The only constraint is that it must match the one in
  * drivers/net/phy/meson-gxl.c to properly match the PHY.
  */
- writel(FIELD_PREP(REG2_PHYID, EPHY_GXL_ID),
+ writel(REG2_RESERVED_28 | FIELD_PREP(REG2_PHYID, EPHY_GXL_ID),
         priv->regs + ETH_REG2);

  /* Enable the internal phy */
-- 
2.39.2

On Tue, May 21, 2024 at 02:56:45PM -0400, Da Xue wrote:
> @@ -65,7 +66,7 @@ static void gxl_enable_internal_mdio(struct
> gxl_mdio_mux *priv)
>   * The only constraint is that it must match the one in
>   * drivers/net/phy/meson-gxl.c to properly match the PHY.
>   */
> - writel(FIELD_PREP(REG2_PHYID, EPHY_GXL_ID),
> + writel(REG2_RESERVED_28 | FIELD_PREP(REG2_PHYID, EPHY_GXL_ID),
>          priv->regs + ETH_REG2);
> 
>   /* Enable the internal phy */

In addition to what Andrew said, you need to look at how you're sending
patches - this patch looks like it has been whitespace damaged, which
means it can't be applied.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!

On Tue, May 21, 2024 at 3:24 PM Russell King (Oracle)
<linux@armlinux.org.uk> wrote:
>
> On Tue, May 21, 2024 at 02:56:45PM -0400, Da Xue wrote:
> > @@ -65,7 +66,7 @@ static void gxl_enable_internal_mdio(struct
> > gxl_mdio_mux *priv)
> >   * The only constraint is that it must match the one in
> >   * drivers/net/phy/meson-gxl.c to properly match the PHY.
> >   */
> > - writel(FIELD_PREP(REG2_PHYID, EPHY_GXL_ID),
> > + writel(REG2_RESERVED_28 | FIELD_PREP(REG2_PHYID, EPHY_GXL_ID),
> >          priv->regs + ETH_REG2);
> >
> >   /* Enable the internal phy */
>
> In addition to what Andrew said, you need to look at how you're sending
> patches - this patch looks like it has been whitespace damaged, which
> means it can't be applied.

Thanks for the feedback. There's 2 reserved ranges in that register
with no further descriptions available.
If naming the bit offset after the field range is OK, I will make edit
and submit a V2 though send-email.

>
> --
> RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
> FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!

On Tue, May 21, 2024 at 02:56:45PM -0400, Da Xue wrote:
> This bit is necessary to enable packets on the interface. Without this
> bit set, ethernet behaves as if it is working but no activity occurs.
> 
> The vendor SDK sets this bit along with the PHY_ID bits. u-boot will set
> this bit as well but if u-boot is not compiled with networking, the
> interface will not work.
> 
> Fixes: 9a24e1ff4326 ("net: mdio: add amlogic gxl mdio mux support");
> 
> Signed-off-by: Da Xue <da@libre.computer>

Please don't put blank lines between tags.

If you intend that this patch is backported to stable, please add

Cc: stable@vger.kernel.org

Also please read:

https://www.kernel.org/doc/html/latest/process/maintainer-netdev.html#netdev-faq

particularly the bit about indicating the tree in the Subject:

    Andrew

---
pw-bot: cr