linux-kernel - Re: [PATCH net-next v2 00/21] net: ravb: Add suspend to RAM and runtime PM support for RZ/G3S

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Message-ID: <35e310fc-24ef-4af6-9d8d-52bb80914cec@tuxon.dev>
Date:   Thu, 14 Dec 2023 13:56:52 +0200
From:   claudiu beznea <claudiu.beznea@...on.dev>
To:     s.shtylyov@....ru, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, richardcochran@...il.com,
        p.zabel@...gutronix.de, yoshihiro.shimoda.uh@...esas.com,
        wsa+renesas@...g-engineering.com, geert+renesas@...der.be
Cc:     netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH net-next v2 00/21] net: ravb: Add suspend to RAM and
 runtime PM support for RZ/G3S



On 14.12.2023 13:45, Claudiu wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> Hi,
> 
> This series adds suspend to RAM and runtime PM support for Ethernet
> IP available on the RZ/G3S (R9A08G045) SoC.
> 
> As there are IP versions that switch to module standby when disabling
> the clocks, and because of module standby IP switches to reset and
> the register content is lost, to be able to have runtime PM supported
> for all IP variants, the configuration operations were moved all to
> ravb_open()/ravb_close() letting the ravb_probe() and ravb_remove()
> to deal with resource parsing and allocation/free.
> 
> The ethtool and IOCTL APIs that could have been run asyncronously
> were adapted to return if the interface is down. As explained in
> each individual commits description, this should be harmless.
> 
> Along with it, the series contains preparatory cleanups.
> 
> The series has been tested on the boards with the following device trees:
> - r8a7742-iwg21d-q7.dts
> - r8a774a1-hihope-rzg2m-ex.dts 
> - r9a07g043u11-smarc-rzg2ul.dts
> - r9a07g054l2-smarc-rzv2l.dts
> - r9a07g044l2-smarc-rzg2l.dts

And also (I forgot to mention):
- r9a08g045s33-smarc.dts (RZ/G3S).

> 
> Patches are based on series at [1].
> 
> Thank you,
> Claudiu Beznea
> 
> Changes in v2:
> - rework the driver (mainly, ravb_open() contains now only resource
>   allocation and parsing leaving the settings to ravb_open(); ravb_remove()
>   has been adapted accordingly) to be able to use runtime PM for all
>   IP variants; due to this number of patches increased
> - adjust previous series to review comments
> - collected tags
> - populated driver's own runtime PM ops with enable/disable of reference
>   clock
> 
> [1] https://lore.kernel.org/all/20231214113137.2450292-1-claudiu.beznea.uj@bp.renesas.com/
> 
> Claudiu Beznea (21):
>   net: ravb: Let IP-specific receive function to interrogate descriptors
>   net: ravb: Rely on PM domain to enable gptp_clk
>   net: ravb: Make reset controller support mandatory
>   net: ravb: Switch to SYSTEM_SLEEP_PM_OPS()/RUNTIME_PM_OPS() and
>     pm_ptr()
>   net: ravb: Use tabs instead of spaces
>   net: ravb: Assert/de-assert reset on suspend/resume
>   net: ravb: Move reference clock enable/disable on runtime PM APIs
>   net: ravb: Move the IRQs get and request in the probe function
>   net: ravb: Split GTI computation and set operations
>   net: ravb: Move delay mode set in the driver's ndo_open API
>   net: ravb: Move DBAT configuration to the driver's ndo_open API
>   net: ravb: Move ptp initialization in the driver's ndo_open API for
>     ccc_gac platorms
>   net: ravb: Set config mode in ndo_open and reset mode in ndo_close
>   net: ravb: Simplify ravb_suspend()
>   net: ravb: Simplify ravb_resume()
>   net: ravb: Keep the reverse order of operations in ravb_close()
>   net: ravb: Keep clock request operations grouped together
>   net: ravb: Return cached statistics if the interface is down
>   net: ravb: Do not set promiscuous mode if the interface is down
>   net: ravb: Do not apply RX CSUM settings to hardware if the interface
>     is down
>   net: ravb: Add runtime PM support
> 
>  drivers/net/ethernet/renesas/ravb.h      |   2 +
>  drivers/net/ethernet/renesas/ravb_main.c | 783 ++++++++++++-----------
>  2 files changed, 417 insertions(+), 368 deletions(-)
>