linux-kernel - Re: [PATCH net-next 1/1] net: stmmac: xgmac: EST interrupts handling

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Message-Id: <20231201064909.28399-1-rohan.g.thomas@intel.com>
Date:   Fri,  1 Dec 2023 14:49:09 +0800
From:   Rohan G Thomas <rohan.g.thomas@...el.com>
To:     fancer.lancer@...il.com
Cc:     alexandre.torgue@...s.st.com, andriy.shevchenko@...ux.intel.com,
        davem@...emloft.net, edumazet@...gle.com, joabreu@...opsys.com,
        kuba@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        mcoquelin.stm32@...il.com, netdev@...r.kernel.org,
        pabeni@...hat.com, rohan.g.thomas@...el.com
Subject: Re: [PATCH net-next 1/1] net: stmmac: xgmac: EST interrupts handling

On Fri, 6 Oct 2023 13:08:33 +0300 Serge Semin wrote:
> Hi Rohan, Jakub
> ...
> Interesting thing. My DW QoS Eth _v5.10a_ HW manual explicitly states that
> it's multiplied by _6_ in nanoseconds (just rechecked). So either there is a
> difference between the minor DW QoS Eth IP-core releases or the older HW-
> manuals have had a typo in the MTL_EST_CONTROL.PTOV field description.
> Synopsys normally describes such changes (whether it was a mistake or a
> functional change) in the IP-core release notes. The release notes document
> is supplied as a separate pdf file. Alas I don't have one.( Even if I had it it
> would have been useless since the change was introduced in the newer QoS
> IP-cores. Rohan, do you happen to have the release notes for DW QoS Eth IP-
> core v5.30 at hands?
> Something like DWC_ether_qos_rc_relnotes.pdf?

Hi Serge,

Sorry for the delay. Sends out another version with the suggested changes.

Managed to get DWC_ether_qos_relnotes.pdf for v5.20a and v5.30a. But I couldn't
find anything related to this. So for refactoring, I'm keeping the logic as in
the upstream code to avoid any regression.

> 
> Also please double check that your DW QoS Eth v5.30a for sure states that
> MTL_EST_CONTROL.PTOV contains value multiplied by _6_. So we wouldn't
> be wasting time trying to workaround a more complex problem than we
> already have.

Yes, I checked this again. For DW QoS Eth v5.30a the multiplier for 
MTL_EST_CONTROL.PTOV is _9_ as per the databook.

Also noticed a similar difference for MTL_EST_Status.BTRL field length. As per
the upstream code and DW QoS Eth v5.10a databook this field covers bit 8 to bit
11. But for the xgmac IP and DW QoS Eth v5.30a databook this field covers bit 8
to bit 15. Again nothing mentioned in the release notes. Here also I'm keeping
the logic as in the upstream code to avoid any regression.

> 
> -Serge(y)
> 

Best Regards,
Rohan