macb broken on HiFive Unleashed

[Claudiu.Beznea at microchip.com]

Hi Andreas,

On 08.03.2021 21:30, Andreas Schwab wrote:
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> 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

Thank you,
Claudiu Beznea

> Andreas.
> 
> --
> Andreas Schwab, schwab at linux-m68k.org
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