[PATCH 1/2] kernel: backports: mt7530: fix TRGMII mode after reset

Ilya Lipnitskiy ilya.lipnitskiy at gmail.com
Tue Mar 16 05:29:55 GMT 2021


Backport upstream patch that fixes TRGMII mode now that mt7530 is
actually resetting the switch on ramips devices.

Patches apply to both Linux 5.4 and 5.10, since TRGMII is broken on both.

Fixes: 69551a244292 ("ramips: manage low reset lines")
Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy at gmail.com>
---
 ...setup-core-clock-even-in-TRGMII-mode.patch | 84 +++++++++++++++++++
 ...setup-core-clock-even-in-TRGMII-mode.patch | 84 +++++++++++++++++++
 ...-net-dsa-mt7530-Support-EEE-features.patch |  6 +-
 ...-net-dsa-mt7530-Support-EEE-features.patch |  6 +-
 4 files changed, 174 insertions(+), 6 deletions(-)
 create mode 100644 target/linux/generic/backport-5.10/780-net-dsa-mt7530-setup-core-clock-even-in-TRGMII-mode.patch
 create mode 100644 target/linux/generic/backport-5.4/780-net-dsa-mt7530-setup-core-clock-even-in-TRGMII-mode.patch

diff --git a/target/linux/generic/backport-5.10/780-net-dsa-mt7530-setup-core-clock-even-in-TRGMII-mode.patch b/target/linux/generic/backport-5.10/780-net-dsa-mt7530-setup-core-clock-even-in-TRGMII-mode.patch
new file mode 100644
index 000000000000..951ae9c664c3
--- /dev/null
+++ b/target/linux/generic/backport-5.10/780-net-dsa-mt7530-setup-core-clock-even-in-TRGMII-mode.patch
@@ -0,0 +1,84 @@
+From c3b8e07909dbe67b0d580416c1a5257643a73be7 Mon Sep 17 00:00:00 2001
+From: Ilya Lipnitskiy <ilya.lipnitskiy at gmail.com>
+Date: Fri, 12 Mar 2021 00:07:03 -0800
+Subject: [PATCH] net: dsa: mt7530: setup core clock even in TRGMII mode
+
+A recent change to MIPS ralink reset logic made it so mt7530 actually
+resets the switch on platforms such as mt7621 (where bit 2 is the reset
+line for the switch). That exposed an issue where the switch would not
+function properly in TRGMII mode after a reset.
+
+Reconfigure core clock in TRGMII mode to fix the issue.
+
+Tested on Ubiquiti ER-X (MT7621) with TRGMII mode enabled.
+
+Fixes: 3f9ef7785a9c ("MIPS: ralink: manage low reset lines")
+Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy at gmail.com>
+Signed-off-by: David S. Miller <davem at davemloft.net>
+---
+ drivers/net/dsa/mt7530.c | 52 +++++++++++++++++++---------------------
+ 1 file changed, 25 insertions(+), 27 deletions(-)
+
+--- a/drivers/net/dsa/mt7530.c
++++ b/drivers/net/dsa/mt7530.c
+@@ -435,34 +435,32 @@ mt7530_pad_clk_setup(struct dsa_switch *
+ 			     TD_DM_DRVP(8) | TD_DM_DRVN(8));
+ 
+ 	/* Setup core clock for MT7530 */
+-	if (!trgint) {
+-		/* Disable MT7530 core clock */
+-		core_clear(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN);
+-
+-		/* Disable PLL, since phy_device has not yet been created
+-		 * provided for phy_[read,write]_mmd_indirect is called, we
+-		 * provide our own core_write_mmd_indirect to complete this
+-		 * function.
+-		 */
+-		core_write_mmd_indirect(priv,
+-					CORE_GSWPLL_GRP1,
+-					MDIO_MMD_VEND2,
+-					0);
+-
+-		/* Set core clock into 500Mhz */
+-		core_write(priv, CORE_GSWPLL_GRP2,
+-			   RG_GSWPLL_POSDIV_500M(1) |
+-			   RG_GSWPLL_FBKDIV_500M(25));
+-
+-		/* Enable PLL */
+-		core_write(priv, CORE_GSWPLL_GRP1,
+-			   RG_GSWPLL_EN_PRE |
+-			   RG_GSWPLL_POSDIV_200M(2) |
+-			   RG_GSWPLL_FBKDIV_200M(32));
+-
+-		/* Enable MT7530 core clock */
+-		core_set(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN);
+-	}
++	/* Disable MT7530 core clock */
++	core_clear(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN);
++
++	/* Disable PLL, since phy_device has not yet been created
++	 * provided for phy_[read,write]_mmd_indirect is called, we
++	 * provide our own core_write_mmd_indirect to complete this
++	 * function.
++	 */
++	core_write_mmd_indirect(priv,
++				CORE_GSWPLL_GRP1,
++				MDIO_MMD_VEND2,
++				0);
++
++	/* Set core clock into 500Mhz */
++	core_write(priv, CORE_GSWPLL_GRP2,
++		   RG_GSWPLL_POSDIV_500M(1) |
++		   RG_GSWPLL_FBKDIV_500M(25));
++
++	/* Enable PLL */
++	core_write(priv, CORE_GSWPLL_GRP1,
++		   RG_GSWPLL_EN_PRE |
++		   RG_GSWPLL_POSDIV_200M(2) |
++		   RG_GSWPLL_FBKDIV_200M(32));
++
++	/* Enable MT7530 core clock */
++	core_set(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN);
+ 
+ 	/* Setup the MT7530 TRGMII Tx Clock */
+ 	core_set(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN);
diff --git a/target/linux/generic/backport-5.4/780-net-dsa-mt7530-setup-core-clock-even-in-TRGMII-mode.patch b/target/linux/generic/backport-5.4/780-net-dsa-mt7530-setup-core-clock-even-in-TRGMII-mode.patch
new file mode 100644
index 000000000000..d48d7972942f
--- /dev/null
+++ b/target/linux/generic/backport-5.4/780-net-dsa-mt7530-setup-core-clock-even-in-TRGMII-mode.patch
@@ -0,0 +1,84 @@
+From c3b8e07909dbe67b0d580416c1a5257643a73be7 Mon Sep 17 00:00:00 2001
+From: Ilya Lipnitskiy <ilya.lipnitskiy at gmail.com>
+Date: Fri, 12 Mar 2021 00:07:03 -0800
+Subject: [PATCH] net: dsa: mt7530: setup core clock even in TRGMII mode
+
+A recent change to MIPS ralink reset logic made it so mt7530 actually
+resets the switch on platforms such as mt7621 (where bit 2 is the reset
+line for the switch). That exposed an issue where the switch would not
+function properly in TRGMII mode after a reset.
+
+Reconfigure core clock in TRGMII mode to fix the issue.
+
+Tested on Ubiquiti ER-X (MT7621) with TRGMII mode enabled.
+
+Fixes: 3f9ef7785a9c ("MIPS: ralink: manage low reset lines")
+Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy at gmail.com>
+Signed-off-by: David S. Miller <davem at davemloft.net>
+---
+ drivers/net/dsa/mt7530.c | 52 +++++++++++++++++++---------------------
+ 1 file changed, 25 insertions(+), 27 deletions(-)
+
+--- a/drivers/net/dsa/mt7530.c
++++ b/drivers/net/dsa/mt7530.c
+@@ -427,34 +427,32 @@ mt7530_pad_clk_setup(struct dsa_switch *
+ 			     TD_DM_DRVP(8) | TD_DM_DRVN(8));
+ 
+ 	/* Setup core clock for MT7530 */
+-	if (!trgint) {
+-		/* Disable MT7530 core clock */
+-		core_clear(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN);
+-
+-		/* Disable PLL, since phy_device has not yet been created
+-		 * provided for phy_[read,write]_mmd_indirect is called, we
+-		 * provide our own core_write_mmd_indirect to complete this
+-		 * function.
+-		 */
+-		core_write_mmd_indirect(priv,
+-					CORE_GSWPLL_GRP1,
+-					MDIO_MMD_VEND2,
+-					0);
+-
+-		/* Set core clock into 500Mhz */
+-		core_write(priv, CORE_GSWPLL_GRP2,
+-			   RG_GSWPLL_POSDIV_500M(1) |
+-			   RG_GSWPLL_FBKDIV_500M(25));
+-
+-		/* Enable PLL */
+-		core_write(priv, CORE_GSWPLL_GRP1,
+-			   RG_GSWPLL_EN_PRE |
+-			   RG_GSWPLL_POSDIV_200M(2) |
+-			   RG_GSWPLL_FBKDIV_200M(32));
+-
+-		/* Enable MT7530 core clock */
+-		core_set(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN);
+-	}
++	/* Disable MT7530 core clock */
++	core_clear(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN);
++
++	/* Disable PLL, since phy_device has not yet been created
++	 * provided for phy_[read,write]_mmd_indirect is called, we
++	 * provide our own core_write_mmd_indirect to complete this
++	 * function.
++	 */
++	core_write_mmd_indirect(priv,
++				CORE_GSWPLL_GRP1,
++				MDIO_MMD_VEND2,
++				0);
++
++	/* Set core clock into 500Mhz */
++	core_write(priv, CORE_GSWPLL_GRP2,
++		   RG_GSWPLL_POSDIV_500M(1) |
++		   RG_GSWPLL_FBKDIV_500M(25));
++
++	/* Enable PLL */
++	core_write(priv, CORE_GSWPLL_GRP1,
++		   RG_GSWPLL_EN_PRE |
++		   RG_GSWPLL_POSDIV_200M(2) |
++		   RG_GSWPLL_FBKDIV_200M(32));
++
++	/* Enable MT7530 core clock */
++	core_set(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN);
+ 
+ 	/* Setup the MT7530 TRGMII Tx Clock */
+ 	core_set(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN);
diff --git a/target/linux/generic/pending-5.10/761-net-dsa-mt7530-Support-EEE-features.patch b/target/linux/generic/pending-5.10/761-net-dsa-mt7530-Support-EEE-features.patch
index 3e4413db02f1..3e654f4b047e 100644
--- a/target/linux/generic/pending-5.10/761-net-dsa-mt7530-Support-EEE-features.patch
+++ b/target/linux/generic/pending-5.10/761-net-dsa-mt7530-Support-EEE-features.patch
@@ -9,7 +9,7 @@ Content-Transfer-Encoding: 8bit
 Signed-off-by: René van Dorst <opensource at vdorst.com>
 --- a/drivers/net/dsa/mt7530.c
 +++ b/drivers/net/dsa/mt7530.c
-@@ -2266,9 +2266,13 @@ static void mt753x_phylink_mac_link_up(s
+@@ -2264,9 +2264,13 @@ static void mt753x_phylink_mac_link_up(s
  	switch (speed) {
  	case SPEED_1000:
  		mcr |= PMCR_FORCE_SPEED_1000;
@@ -23,7 +23,7 @@ Signed-off-by: René van Dorst <opensource at vdorst.com>
  		break;
  	}
  	if (duplex == DUPLEX_FULL) {
-@@ -2509,6 +2513,54 @@ mt753x_phy_write(struct dsa_switch *ds,
+@@ -2507,6 +2511,54 @@ mt753x_phy_write(struct dsa_switch *ds,
  	return priv->info->phy_write(ds, port, regnum, val);
  }
  
@@ -78,7 +78,7 @@ Signed-off-by: René van Dorst <opensource at vdorst.com>
  static const struct dsa_switch_ops mt7530_switch_ops = {
  	.get_tag_protocol	= mtk_get_tag_protocol,
  	.setup			= mt753x_setup,
-@@ -2537,6 +2589,8 @@ static const struct dsa_switch_ops mt753
+@@ -2535,6 +2587,8 @@ static const struct dsa_switch_ops mt753
  	.phylink_mac_an_restart	= mt753x_phylink_mac_an_restart,
  	.phylink_mac_link_down	= mt753x_phylink_mac_link_down,
  	.phylink_mac_link_up	= mt753x_phylink_mac_link_up,
diff --git a/target/linux/generic/pending-5.4/761-net-dsa-mt7530-Support-EEE-features.patch b/target/linux/generic/pending-5.4/761-net-dsa-mt7530-Support-EEE-features.patch
index 1822647ff17b..b9ca691f6f11 100644
--- a/target/linux/generic/pending-5.4/761-net-dsa-mt7530-Support-EEE-features.patch
+++ b/target/linux/generic/pending-5.4/761-net-dsa-mt7530-Support-EEE-features.patch
@@ -9,7 +9,7 @@ Content-Transfer-Encoding: 8bit
 Signed-off-by: René van Dorst <opensource at vdorst.com>
 --- a/drivers/net/dsa/mt7530.c
 +++ b/drivers/net/dsa/mt7530.c
-@@ -1419,9 +1419,13 @@ static void mt7530_phylink_mac_config(st
+@@ -1417,9 +1417,13 @@ static void mt7530_phylink_mac_config(st
  	switch (state->speed) {
  	case SPEED_1000:
  		mcr_new |= PMCR_FORCE_SPEED_1000;
@@ -23,7 +23,7 @@ Signed-off-by: René van Dorst <opensource at vdorst.com>
  		break;
  	}
  	if (state->duplex == DUPLEX_FULL) {
-@@ -1557,6 +1561,54 @@ mt7530_phylink_mac_link_state(struct dsa
+@@ -1555,6 +1559,54 @@ mt7530_phylink_mac_link_state(struct dsa
  	return 1;
  }
  
@@ -78,7 +78,7 @@ Signed-off-by: René van Dorst <opensource at vdorst.com>
  static const struct dsa_switch_ops mt7530_switch_ops = {
  	.get_tag_protocol	= mtk_get_tag_protocol,
  	.setup			= mt7530_setup,
-@@ -1584,6 +1636,8 @@ static const struct dsa_switch_ops mt753
+@@ -1582,6 +1634,8 @@ static const struct dsa_switch_ops mt753
  	.phylink_mac_config	= mt7530_phylink_mac_config,
  	.phylink_mac_link_down	= mt7530_phylink_mac_link_down,
  	.phylink_mac_link_up	= mt7530_phylink_mac_link_up,
-- 
2.30.2




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