Re: [PATCH net] net: phy: mediatek: fix TX blink masks using the RX bits

[Andrew Lunn <andrew@lunn.ch>]

On Tue, Aug 04, 2026 at 10:32:38PM +0400, Ahmed Naseef wrote:
> On Tue, Aug 04, 2026 at 08:11:21PM +0200, Andrew Lunn wrote:
> > On Tue, Aug 04, 2026 at 03:35:11PM +0400, Ahmed Naseef wrote:
> > > MTK_GPHY_LED_TX_BLINK_SET and MTK_2P5GPHY_LED_TX_BLINK_SET are built
> > > from the RX blink bits instead of the TX ones, so both TX masks are
> > > identical to their RX counterparts. The TX bits they should be using,
> > > MTK_PHY_LED_BLINK_{10,100,1000,2500}TX, are otherwise only referenced
> > > by the per-speed branch of mtk_phy_led_hw_ctrl_set().
> > > 
> > > A TX trigger selected without a link trigger therefore programs the RX
> > > blink bits, and the LED blinks on received traffic. The masks are also
> > > used to decode the blink register in mtk_phy_led_hw_ctrl_get(), which
> > > as a result cannot tell the two triggers apart: an RX-only
> > > configuration reads back as RX and TX, and a TX-only configuration
> > > reads back as neither.
> > > 
> > > Fixes: 7f9c320c98db ("net: phy: mediatek: Move LED helper functions into mtk phy lib")
> > 
> > Was this bug introduced in this commit, or did this commit just move
> > the code around and it was broken before? The Fixes should go back to
> > where the bug was added, which could be earlier.
> 
> It was introduced by that commit. Before it, mtk-ge-soc.c correctly had:
> 
>   #define   MTK_PHY_LED_BLINK_TX      (MTK_PHY_LED_BLINK_10TX |\
>                                        MTK_PHY_LED_BLINK_100TX |\
>                                        MTK_PHY_LED_BLINK_1000TX)

Thanks for checking.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

    Andrew