[PATCH v2] ARM: dts: sun7i: a20: bananapro: Fix ethernet node

BPi Pro needs TX and RX delay for Gbit to work reliable and avoid high
packet loss rates. The realtek phy driver overrides the settings of the
pull ups for the delays, so fix this for Banana Pro.

Signed-off-by: Hermann Lauer <redacted>
---
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/sun7i-a20-bananapro.dts b/arch/arm/boot/dts/sun7i-a20-bananapro.dts
--- a/arch/arm/boot/dts/sun7i-a20-bananapro.dts
+++ b/arch/arm/boot/dts/sun7i-a20-bananapro.dts

@@ -110,7 +110,7 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&gmac_rgmii_pins>;
 	phy-handle = <&phy1>;
-	phy-mode = "rgmii";
+	phy-mode = "rgmii-id";
 	phy-supply = <&reg_gmac_3v3>;
 	status = "okay";
 };

Dne četrtek, 21. januar 2021 ob 18:08:36 CET je Hermann Lauer napisal(a):

BPi Pro needs TX and RX delay for Gbit to work reliable and avoid high
packet loss rates. The realtek phy driver overrides the settings of the
pull ups for the delays, so fix this for Banana Pro.

Signed-off-by: Hermann Lauer <redacted>

Much better. Now the only thing missing is "Fixes" tag, which references 
commit which introduced the issue. Probably this will be the commit which 
added ethernet node. This tag is important for deciding which commits should 
be backported to stable releases. Take a look in v1 for M2U fixes tag.

Btw, each version should have changelog under "---" line, so maintainers and 
reviewers know what changed.

Best regards,
Jernej

On Fri, Jan 22, 2021 at 3:54 AM Jernej Škrabec [off-list ref] wrote:

Dne četrtek, 21. januar 2021 ob 18:08:36 CET je Hermann Lauer napisal(a):

quoted

BPi Pro needs TX and RX delay for Gbit to work reliable and avoid high
packet loss rates. The realtek phy driver overrides the settings of the
pull ups for the delays, so fix this for Banana Pro.

Signed-off-by: Hermann Lauer <redacted>

Much better. Now the only thing missing is "Fixes" tag, which references
commit which introduced the issue. Probably this will be the commit which
added ethernet node. This tag is important for deciding which commits should
be backported to stable releases. Take a look in v1 for M2U fixes tag.

Btw, each version should have changelog under "---" line, so maintainers and
reviewers know what changed.

The subject line should also be more concise. "Fix ethernet phy-mode" reads
much better than "Fix ethernet node", which could mean a number of things.

ChenYu

BPi Pro needs TX and RX delay for Gbit to work reliable and avoid high
packet loss rates. The realtek phy driver overrides the settings of the
pull ups for the delays, so fix this for BananaPro.

Fixes: 10662a33dcd9 ("ARM: dts: sun7i: Add dts file for Bananapro board")
Signed-off-by: Hermann Lauer <redacted>
---
 arch/arm/boot/dts/sun7i-a20-bananapro.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/sun7i-a20-bananapro.dts b/arch/arm/boot/dts/sun7i-a20-bananapro.dts
--- a/arch/arm/boot/dts/sun7i-a20-bananapro.dts
+++ b/arch/arm/boot/dts/sun7i-a20-bananapro.dts

@@ -110,7 +110,7 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&gmac_rgmii_pins>;
 	phy-handle = <&phy1>;
-	phy-mode = "rgmii";
+	phy-mode = "rgmii-id";
 	phy-supply = <&reg_gmac_3v3>;
 	status = "okay";
 };

BPi Pro needs TX and RX delay for Gbit to work reliable and avoid high
packet loss rates. The realtek phy driver overrides the settings of the
pull ups for the delays, so fix this for BananaPro.
    
Fix the phy-mode description to correctly reflect this so that the
implementation doesn't reconfigure the delays incorrectly. This
happened with commit bbc4d71d6354 ("net: phy: realtek: fix rtl8211e
rx/tx delay config").

Fixes: 10662a33dcd9 ("ARM: dts: sun7i: Add dts file for Bananapro board")
Signed-off-by: Hermann Lauer <redacted>
---
 arch/arm/boot/dts/sun7i-a20-bananapro.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/sun7i-a20-bananapro.dts b/arch/arm/boot/dts/sun7i-a20-bananapro.dts
--- a/arch/arm/boot/dts/sun7i-a20-bananapro.dts
+++ b/arch/arm/boot/dts/sun7i-a20-bananapro.dts

@@ -110,7 +110,7 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&gmac_rgmii_pins>;
 	phy-handle = <&phy1>;
-	phy-mode = "rgmii";
+	phy-mode = "rgmii-id";
 	phy-supply = <&reg_gmac_3v3>;
 	status = "okay";
 };

On Thu, Jan 28, 2021 at 12:18:42PM +0100, Hermann.Lauer@uni-heidelberg.de wrote:

BPi Pro needs TX and RX delay for Gbit to work reliable and avoid high
packet loss rates. The realtek phy driver overrides the settings of the
pull ups for the delays, so fix this for BananaPro.
    
Fix the phy-mode description to correctly reflect this so that the
implementation doesn't reconfigure the delays incorrectly. This
happened with commit bbc4d71d6354 ("net: phy: realtek: fix rtl8211e
rx/tx delay config").

Fixes: 10662a33dcd9 ("ARM: dts: sun7i: Add dts file for Bananapro board")
Signed-off-by: Hermann Lauer <redacted>

Applied since it's a fix simple enough, but please provide a changelog
between versions.

Maxime

On Thu, Jan 28, 2021 at 03:59:37PM +0100, Maxime Ripard wrote:

On Thu, Jan 28, 2021 at 12:18:42PM +0100, Hermann.Lauer@uni-heidelberg.de wrote:

quoted

BPi Pro needs TX and RX delay for Gbit to work reliable and avoid high
packet loss rates. The realtek phy driver overrides the settings of the
pull ups for the delays, so fix this for BananaPro.
    
Fix the phy-mode description to correctly reflect this so that the
implementation doesn't reconfigure the delays incorrectly. This
happened with commit bbc4d71d6354 ("net: phy: realtek: fix rtl8211e
rx/tx delay config").

Fixes: 10662a33dcd9 ("ARM: dts: sun7i: Add dts file for Bananapro board")
Signed-off-by: Hermann Lauer <redacted>

Applied since it's a fix simple enough, but please provide a changelog
between versions.

v3 added the correct fixes tag, where the problem originated (initial commit
of banana pro device tree). That worked in the past until a change in
the phy device driver for realtek phy on banana pro overrode the
phyical configuration of the hardware pull-ups.

v4 added the commit which implemented that driver change (shamelessly stolen
from the commit of the fix of the identical problem on the banana pi)

Thanks,
 greetings
  Hermann

-- 
Administration/Zentrale Dienste, Interdiziplinaeres 
Zentrum fuer wissenschaftliches Rechnen der Universitaet Heidelberg
IWR; INF 205; 69120 Heidelberg; Tel: (06221)54-14405 Fax: -14427
Email: Hermann.Lauer@iwr.uni-heidelberg.de

On Mon, Feb 01, 2021 at 01:08:03PM +0100, Hermann Lauer wrote:

On Thu, Jan 28, 2021 at 03:59:37PM +0100, Maxime Ripard wrote:

quoted

On Thu, Jan 28, 2021 at 12:18:42PM +0100, Hermann.Lauer@uni-heidelberg.de wrote:

quoted

BPi Pro needs TX and RX delay for Gbit to work reliable and avoid high
packet loss rates. The realtek phy driver overrides the settings of the
pull ups for the delays, so fix this for BananaPro.
    
Fix the phy-mode description to correctly reflect this so that the
implementation doesn't reconfigure the delays incorrectly. This
happened with commit bbc4d71d6354 ("net: phy: realtek: fix rtl8211e
rx/tx delay config").

Fixes: 10662a33dcd9 ("ARM: dts: sun7i: Add dts file for Bananapro board")
Signed-off-by: Hermann Lauer <redacted>

Applied since it's a fix simple enough, but please provide a changelog
between versions.

v3 added the correct fixes tag, where the problem originated (initial commit
of banana pro device tree). That worked in the past until a change in
the phy device driver for realtek phy on banana pro overrode the
phyical configuration of the hardware pull-ups.

v4 added the commit which implemented that driver change (shamelessly stolen
from the commit of the fix of the identical problem on the banana pi)

Thanks :)

For future patches make sure to have that description either in a cover
letter or below the --- after your commit log

Maxime