Re: [PATCH v2 0/7] remove different PHY fixups
Hi Russell, sorry for the noise of this arriving in your inbox twice. Apparently I messed up and replied in private in my last mail. Am Dienstag, dem 13.04.2021 um 11:51 +0100 schrieb Russell King - ARM Linux admin: > On Tue, Apr 13, 2021 at 12:00:45PM +0200, Lucas Stach wrote: > > I agree with the opinion that those PHY fixups introduce more harm than > > good. Essentially they are pushing board specific configuration values > > into the PHY, without any checks that the fixup is even running on the > > specific board it was targeted at. > > Yes and no. The problem is, that's an easy statement to make when one > doesn't understand what they're all doing. > > Some are "board specific" in that the normal setup for e.g. iMX6 would > be to enable clock output from the AR8035 PHY and feed that into the > iMX6 - as far as I'm aware, that's the only working configuration for > that SoC and PHY. However, it's also true that this fixup should not > be applied unconditionally. > > Then there's SmartEEE - it has been found that the PHY defaults for > this lead to link drops independent of the board and SoC that it is > connected to. It seems that the PHY is essentially broken - it powers > up with SmartEEE enabled, and when connected to another SmartEEE > supporting device, it seems guaranteed that it will result in link > drops in its default configuration. > > Freescale's approach has apparently been to unconditionally disable > SmartEEE for all their platforms because of this. With a bit of > research however (as has been done by Jon and myself) we've found > that increasing the Tw parameter for 1G connections results in a > much more stable link. > > So, just saying that these are bad without actually understanding what > they are doing is _also_ bad. I'm not saying the fixups are bad per se. What I'm saying is that they are inherently board specific and the right way to apply them is either via DT properties, or if absolutely necessary via a fixup that at least checks that it is running on the specific board it was targeted at. While SmartEEE disabling will cause no big harm, aside from a bit more power consumption, a wrong clock configuration can cause major confusion. Especially if the configuration in DT and values put into the PHY via fixups differ from each other. Regards, Lucas
Re: [PATCH v2 0/7] remove different PHY fixups
On Tue, Apr 13, 2021 at 12:00:45PM +0200, Lucas Stach wrote: > I agree with the opinion that those PHY fixups introduce more harm than > good. Essentially they are pushing board specific configuration values > into the PHY, without any checks that the fixup is even running on the > specific board it was targeted at. Yes and no. The problem is, that's an easy statement to make when one doesn't understand what they're all doing. Some are "board specific" in that the normal setup for e.g. iMX6 would be to enable clock output from the AR8035 PHY and feed that into the iMX6 - as far as I'm aware, that's the only working configuration for that SoC and PHY. However, it's also true that this fixup should not be applied unconditionally. Then there's SmartEEE - it has been found that the PHY defaults for this lead to link drops independent of the board and SoC that it is connected to. It seems that the PHY is essentially broken - it powers up with SmartEEE enabled, and when connected to another SmartEEE supporting device, it seems guaranteed that it will result in link drops in its default configuration. Freescale's approach has apparently been to unconditionally disable SmartEEE for all their platforms because of this. With a bit of research however (as has been done by Jon and myself) we've found that increasing the Tw parameter for 1G connections results in a much more stable link. So, just saying that these are bad without actually understanding what they are doing is _also_ bad. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
Re: [PATCH v2 0/7] remove different PHY fixups
Hi all, Am Dienstag, dem 09.03.2021 um 12:26 +0100 schrieb Oleksij Rempel: > changes v2: > - rebase against latest kernel > - fix networking on RIoTBoard > > This patch series tries to remove most of the imx6 and imx7 board > specific PHY configuration via fixup, as this breaks the PHYs when > connected to switch chips or USB Ethernet MACs. > > Each patch has the possibility to break boards, but contains a > recommendation to fix the problem in a more portable and future-proof > way. I agree with the opinion that those PHY fixups introduce more harm than good. Essentially they are pushing board specific configuration values into the PHY, without any checks that the fixup is even running on the specific board it was targeted at. While there is a real chance to break some out of tree boards or incomplete configs I think that's something we can accept here. If someone makes a case why they can absolutely not fixup their DT or kernel config we could even bring back some of those fixups with a proper board compatible check to avoid mashing things up for other boards with the same PHY. I guess the only realistic way to learn if someone can make such a case is to apply this series and look for any fallout. So for what it is worth: Acked-by: Lucas Stach > regards, > Oleksij > > Oleksij Rempel (7): > ARM: imx6q: remove PHY fixup for KSZ9031 > ARM: imx6q: remove TX clock delay of ar8031_phy_fixup() > ARM: imx6q: remove hand crafted PHY power up in ar8035_phy_fixup() > ARM: imx6q: remove clk-out fixup for the Atheros AR8031 and AR8035 > PHYs > ARM: imx6q: remove Atheros AR8035 SmartEEE fixup > ARM: imx6sx: remove Atheros AR8031 PHY fixup > ARM: imx7d: remove Atheros AR8031 PHY fixup > > arch/arm/boot/dts/imx6dl-riotboard.dts | 2 + > arch/arm/boot/dts/imx6q-dmo-edmqmx6.dts | 2 +- > arch/arm/mach-imx/mach-imx6q.c | 85 - > arch/arm/mach-imx/mach-imx6sx.c | 26 > arch/arm/mach-imx/mach-imx7d.c | 22 --- > 5 files changed, 3 insertions(+), 134 deletions(-) >
Re: [PATCH v2 0/7] remove different PHY fixups
Hello, On Tue, Mar 30, 2021 at 12:04:50PM -0300, Fabio Estevam wrote: > Hi Andrew, > > On Tue, Mar 30, 2021 at 11:30 AM Andrew Lunn wrote: > > > Hi Fabio > > > > I think it should be merged, and we fixup anything which does break. > > We are probably at the point where more is broken by not merging it > > than merging it. > > Thanks for your feedback. I agree. > > Shawn wants to collect some Acked-by for this series. > > Could you please give your Acked-by for this series? Andrew, can you please add you ACK? Shawn will it be enough or you need more ACKs? Regards, Oleksij -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0| Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917- |
Re: [PATCH v2 0/7] remove different PHY fixups
Hi Andrew, On Tue, Mar 30, 2021 at 11:30 AM Andrew Lunn wrote: > Hi Fabio > > I think it should be merged, and we fixup anything which does break. > We are probably at the point where more is broken by not merging it > than merging it. Thanks for your feedback. I agree. Shawn wants to collect some Acked-by for this series. Could you please give your Acked-by for this series? Thanks
Re: [PATCH v2 0/7] remove different PHY fixups
On Tue, Mar 30, 2021 at 11:00:52AM -0300, Fabio Estevam wrote: > Hi Oleksij, > > On Tue, Mar 9, 2021 at 8:26 AM Oleksij Rempel wrote: > > > > changes v2: > > - rebase against latest kernel > > - fix networking on RIoTBoard > > > > This patch series tries to remove most of the imx6 and imx7 board > > specific PHY configuration via fixup, as this breaks the PHYs when > > connected to switch chips or USB Ethernet MACs. > > > > Each patch has the possibility to break boards, but contains a > > recommendation to fix the problem in a more portable and future-proof > > way. > > I think this series moves us in the right direction, even with the > possibility to break old dtb's. > > Reviewed-by: Fabio Estevam > > Andrew, what do you think? Hi Fabio I think it should be merged, and we fixup anything which does break. We are probably at the point where more is broken by not merging it than merging it. Andrew
Re: [PATCH v2 0/7] remove different PHY fixups
Hi Oleksij, On Tue, Mar 9, 2021 at 8:26 AM Oleksij Rempel wrote: > > changes v2: > - rebase against latest kernel > - fix networking on RIoTBoard > > This patch series tries to remove most of the imx6 and imx7 board > specific PHY configuration via fixup, as this breaks the PHYs when > connected to switch chips or USB Ethernet MACs. > > Each patch has the possibility to break boards, but contains a > recommendation to fix the problem in a more portable and future-proof > way. I think this series moves us in the right direction, even with the possibility to break old dtb's. Reviewed-by: Fabio Estevam Andrew, what do you think? Thanks
Re: [PATCH v2 0/7] remove different PHY fixups
On Mon, Mar 29, 2021 at 08:44:59AM +0800, Shawn Guo wrote: > On Wed, Mar 24, 2021 at 06:54:24AM +0100, Oleksij Rempel wrote: > > Hi Shawn, > > > > ping, do this patches need some ACK from some one? > > As this will break existing DTBs, I need more ACKs from people to see > the consensus that this is the right thing to do. Do you need ACKs from some concrete people? Regards, Oleksij -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0| Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917- |
Re: [PATCH v2 0/7] remove different PHY fixups
On Wed, Mar 24, 2021 at 06:54:24AM +0100, Oleksij Rempel wrote: > Hi Shawn, > > ping, do this patches need some ACK from some one? As this will break existing DTBs, I need more ACKs from people to see the consensus that this is the right thing to do. Shawn > > Regards, > Oleksij > > On Tue, Mar 09, 2021 at 12:26:08PM +0100, Oleksij Rempel wrote: > > changes v2: > > - rebase against latest kernel > > - fix networking on RIoTBoard > > > > This patch series tries to remove most of the imx6 and imx7 board > > specific PHY configuration via fixup, as this breaks the PHYs when > > connected to switch chips or USB Ethernet MACs. > > > > Each patch has the possibility to break boards, but contains a > > recommendation to fix the problem in a more portable and future-proof > > way. > > > > regards, > > Oleksij > > > > Oleksij Rempel (7): > > ARM: imx6q: remove PHY fixup for KSZ9031 > > ARM: imx6q: remove TX clock delay of ar8031_phy_fixup() > > ARM: imx6q: remove hand crafted PHY power up in ar8035_phy_fixup() > > ARM: imx6q: remove clk-out fixup for the Atheros AR8031 and AR8035 > > PHYs > > ARM: imx6q: remove Atheros AR8035 SmartEEE fixup > > ARM: imx6sx: remove Atheros AR8031 PHY fixup > > ARM: imx7d: remove Atheros AR8031 PHY fixup > > > > arch/arm/boot/dts/imx6dl-riotboard.dts | 2 + > > arch/arm/boot/dts/imx6q-dmo-edmqmx6.dts | 2 +- > > arch/arm/mach-imx/mach-imx6q.c | 85 - > > arch/arm/mach-imx/mach-imx6sx.c | 26 > > arch/arm/mach-imx/mach-imx7d.c | 22 --- > > 5 files changed, 3 insertions(+), 134 deletions(-) > > > > -- > > 2.29.2 > > > > > > -- > Pengutronix e.K. | | > Steuerwalder Str. 21 | http://www.pengutronix.de/ | > 31137 Hildesheim, Germany | Phone: +49-5121-206917-0| > Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917- |
Re: [PATCH v2 0/7] remove different PHY fixups
Hi Shawn, ping, do this patches need some ACK from some one? Regards, Oleksij On Tue, Mar 09, 2021 at 12:26:08PM +0100, Oleksij Rempel wrote: > changes v2: > - rebase against latest kernel > - fix networking on RIoTBoard > > This patch series tries to remove most of the imx6 and imx7 board > specific PHY configuration via fixup, as this breaks the PHYs when > connected to switch chips or USB Ethernet MACs. > > Each patch has the possibility to break boards, but contains a > recommendation to fix the problem in a more portable and future-proof > way. > > regards, > Oleksij > > Oleksij Rempel (7): > ARM: imx6q: remove PHY fixup for KSZ9031 > ARM: imx6q: remove TX clock delay of ar8031_phy_fixup() > ARM: imx6q: remove hand crafted PHY power up in ar8035_phy_fixup() > ARM: imx6q: remove clk-out fixup for the Atheros AR8031 and AR8035 > PHYs > ARM: imx6q: remove Atheros AR8035 SmartEEE fixup > ARM: imx6sx: remove Atheros AR8031 PHY fixup > ARM: imx7d: remove Atheros AR8031 PHY fixup > > arch/arm/boot/dts/imx6dl-riotboard.dts | 2 + > arch/arm/boot/dts/imx6q-dmo-edmqmx6.dts | 2 +- > arch/arm/mach-imx/mach-imx6q.c | 85 - > arch/arm/mach-imx/mach-imx6sx.c | 26 > arch/arm/mach-imx/mach-imx7d.c | 22 --- > 5 files changed, 3 insertions(+), 134 deletions(-) > > -- > 2.29.2 > > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0| Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917- |
[PATCH v2 0/7] remove different PHY fixups
changes v2: - rebase against latest kernel - fix networking on RIoTBoard This patch series tries to remove most of the imx6 and imx7 board specific PHY configuration via fixup, as this breaks the PHYs when connected to switch chips or USB Ethernet MACs. Each patch has the possibility to break boards, but contains a recommendation to fix the problem in a more portable and future-proof way. regards, Oleksij Oleksij Rempel (7): ARM: imx6q: remove PHY fixup for KSZ9031 ARM: imx6q: remove TX clock delay of ar8031_phy_fixup() ARM: imx6q: remove hand crafted PHY power up in ar8035_phy_fixup() ARM: imx6q: remove clk-out fixup for the Atheros AR8031 and AR8035 PHYs ARM: imx6q: remove Atheros AR8035 SmartEEE fixup ARM: imx6sx: remove Atheros AR8031 PHY fixup ARM: imx7d: remove Atheros AR8031 PHY fixup arch/arm/boot/dts/imx6dl-riotboard.dts | 2 + arch/arm/boot/dts/imx6q-dmo-edmqmx6.dts | 2 +- arch/arm/mach-imx/mach-imx6q.c | 85 - arch/arm/mach-imx/mach-imx6sx.c | 26 arch/arm/mach-imx/mach-imx7d.c | 22 --- 5 files changed, 3 insertions(+), 134 deletions(-) -- 2.29.2
