macb broken on HiFive Unleashed

[Willy Tarreau]

Hi,

On Tue, Mar 09, 2021 at 08:55:10AM +0000, Claudiu.Beznea at microchip.com wrote:
> Hi Andreas,
> 
> On 08.03.2021 21:30, Andreas Schwab wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> > 
> > One of the changes to the macb driver between 5.10 and 5.11 has broken
> > the SiFive HiFive Unleashed.  These are the last messages before the
> > system hangs:
> > 
> > [   12.468674] libphy: Fixed MDIO Bus: probed
> > [   12.746518] macb 10090000.ethernet: Registered clk switch 'sifive-gemgxl-mgmt'
> > [   12.753119] macb 10090000.ethernet: GEM doesn't support hardware ptp.
> > [   12.760178] libphy: MACB_mii_bus: probed
> > [   12.881792] MACsec IEEE 802.1AE
> > [   12.944426] macb 10090000.ethernet eth0: Cadence GEM rev 0x10070109 at 0x10090000 irq 16 (70:b3:d5:92:f1:07)
> > 
> 
> I don't have a SiFive HiFive Unleashed to investigate this. Can you check
> if reverting commits on macb driver b/w 5.10 and 5.11 solves your issues:
> 
> git log --oneline v5.10..v5.11 -- drivers/net/ethernet/cadence/
> 1d0d561ad1d7 net: macb: Correct usage of MACB_CAPS_CLK_HW_CHG flag
> 1d608d2e0d51 Revert "macb: support the two tx descriptors on at91rm9200"
> 700d566e8171 net: macb: add support for sama7g5 emac interface
> ec771de654e4 net: macb: add support for sama7g5 gem interface
> f4de93f03ed8 net: macb: unprepare clocks in case of failure
> 38493da4e6a8 net: macb: add function to disable all macb clocks
> daafa1d33cc9 net: macb: add capability to not set the clock rate
> edac63861db7 net: macb: add userio bits as platform configuration
> 9e6cad531c9d net: macb: Fix passing zero to 'PTR_ERR'
> 0012eeb370f8 net: macb: fix NULL dereference due to no pcs_config method
> e4e143e26ce8 net: macb: add support for high speed interface

In addition, it's worth mentioning that the driver has multiple rx/tx/irq
functions depending on the platforms or chip variants, and that based on
this it should be easy to further reduce this list.

Just my two cents,
Willy