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Date: Fri, 29 Dec 2017 13:04:24 +0100
From: Emiliano Ingrassia <ingrassia@...genesys.com>
To: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc: linus.luessing@...3.blue, Neil Armstrong <narmstrong@...libre.com>,
netdev@...r.kernel.org, peppe.cavallaro@...com,
alexandre.torgue@...com, khilman@...libre.com,
linux-amlogic@...ts.infradead.org, jbrunet@...libre.com
Subject: Re: [RFT net-next v3 0/5] dwmac-meson8b: RGMII clock fixes for
Meson8b
Hi Martin,
On Fri, Dec 29, 2017 at 08:48:54AM +0100, Martin Blumenstingl wrote:
> Hi Emiliano,
>
> On Fri, Dec 29, 2017 at 2:31 AM, Emiliano Ingrassia
> <ingrassia@...genesys.com> wrote:
> > Hi Martin, Hi Dave,
> >
> > On Thu, Dec 28, 2017 at 11:21:23PM +0100, Martin Blumenstingl wrote:
> >> Hi Dave,
> >>
> >> please do not apply this series until it got a Tested-by from Emiliano.
> >>
> >>
> >> Hi Emiliano,
> >>
> >> you reported [0] that you couldn't get dwmac-meson8b to work on your
> >> Odroid-C1. With your findings (register dumps, clk_summary output, etc.)
> >> I think I was able to find a fix: it consists of two patches (which you
> >> find in this series)
> >>
> >> Unfortunately I don't have any Meson8b boards with RGMII PHY so I could
> >> only partially test this (I could only check if the clocks were
> >> calculated correctly when using a dummy 500002394Hz input clock instead
> >> of MPLL2).
> >>
> >> Could you please give this series a try and let me know about the
> >> results?
> >> You obviously still need your two "ARM: dts: meson8b" patches which
> >> - add the amlogic,meson8b-dwmac" compatible to meson8b.dtsi
> >> - enable Ethernet on the Odroid-C1
> >>
> >> When testing on Meson8b this also needs a fix for the MPLL clock driver:
> >> "clk: meson: mpll: use 64-bit maths in params_from_rate", see:
> >> https://patchwork.kernel.org/patch/10131677/
> >>
> >>
> >> I have tested this myself on a Khadas VIM (GXL SoC, internal RMII PHY)
> >> and a Khadas VIM2 (GXM SoC, external RGMII PHY). Both are still working
> >> fine (so let's hope that this also fixes your Meson8b issue :)).
> >>
> >>
> >> changes since v1 at [1]:
> >> - changed the subject of the cover-letter to indicate that this is all
> >> about the RGMII clock
> >> - added PATCH #1 which ensures that we don't unnecessarily change the
> >> parent clocks in RMII mode (and also makes the code easier to
> >> understand)
> >> - changed subject of PATCH #2 (formerly PATCH #1) to state that this
> >> is about the RGMII clock
> >> - added Jerome's Reviewed-by to PATCH #2 (formerly PATCH #1)
> >> - replaced PATCH #3 (formerly PATCH #2) with one that sets
> >> CLK_SET_RATE_PARENT on the mux and thus re-configures the MPLL2 clock
> >> on Meson8b correctly
> >>
> >> changes since v2 at [2]:
> >> - added PATCH #2 to make the following patch easier
> >> - Emiliano reported that there's currently another bug in the
> >> dwmac-meson8b driver which prevents it from working with RGMII PHYs on
> >> Meson8b: bit 10 of the PRG_ETH0 register is configures a clock gate
> >> (instead of a divide by 5 or divide by 10 clock divider). This has not
> >> been visible on GXBB and later due to the input clock which always led
> >> to a selection of "divide by 10" (which is done internally in the IP
> >> block, but the bit actually means "enable RGMII clock output").
> >> PATCH #3 was added to address this issue.
> >> - the commit message of PATCH #4 and #5 (formerly PATCH #2 and #3) were
> >> updated and the patch itself rebased because the m25_div clock was
> >> removed with the new PATCH #3 (so some of the statements were not
> >> valid anymore)
> >>
> >
> > Here is the clk_summary relative to ethernet on Odroid-C1+
> > with this new series applied:
> >
> > xtal 1 1 24000000 0 0
> > sys_pll 0 0 1200000000 0 0
> > cpu_clk 0 0 1200000000 0 0
> > vid_pll 0 0 732000000 0 0
> > fixed_pll 2 2 2550000000 0 0
> > mpll2 1 1 249999701 0 0
> > c9410000.ethernet#m250_sel 1 1 249999701 0 0
> > c9410000.ethernet#m250_div 1 1 249999701 0 0
> > c9410000.ethernet#fixed_div10 1 1 24999970 0 0
> > c9410000.ethernet#m25_en 1 1 24999970 0 0
> >
> > The ethernet prg0 register is set to 0x74A1 which should be correct with
> > respect to the information contained in the S805 SoC manual.
> > Actually, the ethernet is not yet fully functional.
> > Trying to ping the board, I can see ARP request from host to board using
> > tcpdump. However, the host can't see any response.
> great - we're getting closer!
>
> > Following the U-Boot value for prg0 register, which is 0x7d21, I also
> > tried to set bit 11. As expected, this did not have any influence.
> it *may* be something outside the PRG_ETH0 register than
> to confirm that: could you temporarily revert the last patch from this
> series ("net: stmmac: dwmac-meson8b: propagate rate changes to the
> parent clock")? this way MPLL2 will stay at ~500MHz and PRG_ETH0
> should be identical to what u-boot sets (apart from bit 11, but that
> is only relevant in RMII mode according to the datasheet)
>
Here is the clk_summary after your suggestion:
xtal 1 1 24000000 0 0
sys_pll 0 0 1200000000 0 0
cpu_clk 0 0 1200000000 0 0
vid_pll 0 0 732000000 0 0
fixed_pll 2 2 2550000000 0 0
mpll2 1 1 500002394 0 0
c9410000.ethernet#m250_sel 1 1 500002394 0 0
c9410000.ethernet#m250_div 1 1 166667465 0 0
c9410000.ethernet#fixed_div10 1 1 16666746 0 0
c9410000.ethernet#m25_en 1 1 16666746 0 0
which seems worse. Pinging the board, I still see ARP request/reply via
tcpdump. The host, however, can't see any.
> > Another thing that we should check is the "Ethernet Memory PD" (see S805
> > manual - sec. 5.4) register which bits 3-2 enable/disable ethernet
> > normal operation. However, those bits are already cleared by U-Boot.
> if the peripheral registers itself are configured correctly it's
> typically one of these issues:
> - gate clock not being enabled (can you confirm that you hav the
> "stmmaceth" with CLKID_ETH in the ethmac node?)
- yes, I have;
> - incorrect pinmux settings (as a hack I would remove all ethernet
> pinctrl properties/nodes from meson8b.dtsi and meson8b-odroidc1.dts.
> before booting the mainline kernel you'll need to use Ethernet from
> within u-boot once)
- tried; nothing changed;
> - incorrect TX delay (amlogic,tx-delay-ns = <2> should be defined in
> meson8b-odroidc1.dts, but the driver should auto-select that value if
> it's missing)
- defined as in odroid-c2 dts;
> - IP block being in some undefined state which can be brought back
> into a working state by adding the reset line (RESET_ETHERNET)
- I have it;
> - Ethernet PHY being in some undefined state can be brought back into
> a working state by adding the reset line (GPIOH_4, see
> meson-gxbb-odroidc2.dts how to use that)
- have it.
> - I have not seen that the power-domains ("Ethernet Memory PD") were a
> problem yet, but you already checked that
>
> maybe you can share your current .dts patch and a boot-log so others
> can have a look as well?
>
OK, no problem.
> > Thank you for the support.
> thank you for your patience as well, most people would have given up by now
>
> > Best regards,
> >
> > Emiliano
> >
> >>
> >> [0] http://lists.infradead.org/pipermail/linux-amlogic/2017-December/005596.html
> >> [1] http://lists.infradead.org/pipermail/linux-amlogic/2017-December/005848.html
> >> [2] http://lists.infradead.org/pipermail/linux-amlogic/2017-December/005861.html
> >>
> >>
> >> Martin Blumenstingl (5):
> >> net: stmmac: dwmac-meson8b: only configure the clocks in RGMII mode
> >> net: stmmac: dwmac-meson8b: simplify generating the clock names
> >> net: stmmac: dwmac-meson8b: fix internal RGMII clock configuration
> >> net: stmmac: dwmac-meson8b: fix setting the RGMII clock on Meson8b
> >> net: stmmac: dwmac-meson8b: propagate rate changes to the parent clock
> >>
> >> .../net/ethernet/stmicro/stmmac/dwmac-meson8b.c | 119 +++++++++++----------
> >> 1 file changed, 63 insertions(+), 56 deletions(-)
> >>
> >> --
> >> 2.15.1
> >>
>
>
> Regards
> Martin
>
Regards,
Emiliano
> _______________________________________________
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