[PATCH net] net: stmmac: Apply redundant write work around on 4.xx too

[Simon Horman]

On Fri, Jul 21, 2023 at 03:39:20PM +0200, Vincent Whitchurch wrote:
> commit a3a57bf07de23fe1ff779e0fdf710aa581c3ff73 ("net: stmmac: work
> around sporadic tx issue on link-up") worked around a problem with TX
> sometimes not working after a link-up by avoiding a redundant write to
> MAC_CTRL_REG (aka GMAC_CONFIG), since the IP appeared to have problems
> with handling multiple writes to that register in some cases.
> 
> That commit however only added the work around to dwmac_lib.c (apart
> from the common code in stmmac_main.c), but my systems with version
> 4.21a of the IP exhibit the same problem, so add the work around to
> dwmac4_lib.c too.
> 
> Fixes: a3a57bf07de2 ("net: stmmac: work around sporadic tx issue on link-up")
> Signed-off-by: Vincent Whitchurch <vincent.whitchurch at axis.com>

Reviewed-by: Simon Horman <simon.horman at corigine.com>