On Thu, 12 Nov 2020 20:26:08 +0200 Claudiu Manoil wrote:
> From: Alex Marginean <alexandru.margin...@nxp.com>
>
> Due to a hardware issue, an access to MDIO registers
> that is concurrent with other ENETC register accesses
> may lead to the MDIO access being dropped or corrupted.
> The workaround introduces locking for all register accesses
> to the ENETC register space. To reduce performance impact,
> a readers-writers locking scheme has been implemented.
> The writer in this case is the MDIO access code (irrelevant
> whether that MDIO access is a register read or write), and
> the reader is any access code to non-MDIO ENETC registers.
> Also, the datapath functions acquire the read lock fewer times
> and use _hot accessors. All the rest of the code uses the _wa
> accessors which lock every register access.
> The commit introducing MDIO support is -
> commit ebfcb23d62ab ("enetc: Add ENETC PF level external MDIO support")
> but due to subsequent refactoring this patch is applicable on
> top of a later commit.
>
> Fixes: 6517798dd343 ("enetc: Make MDIO accessors more generic and export to
> include/linux/fsl")
> Signed-off-by: Alex Marginean <alexandru.margin...@nxp.com>
> Signed-off-by: Vladimir Oltean <vladimir.olt...@nxp.com>
> Signed-off-by: Claudiu Manoil <claudiu.man...@nxp.com>
Applied.
