[PATCH net] net: dsa: mt7530: setup core clock even in TRGMII mode

Subsystems: mediatek switch driver, networking drivers, networking [dsa], the rest

STALE1994d

5 messages, 4 authors, 2021-03-19 · open the first message on its own page

[PATCH net] net: dsa: mt7530: setup core clock even in TRGMII mode

From: Ilya Lipnitskiy <hidden>
Date: 2021-03-11 01:21:48

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 <redacted>
---
 drivers/net/dsa/mt7530.c | 52 +++++++++++++++++++---------------------
 1 file changed, 25 insertions(+), 27 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index f06f5fa2f898..9871d7cff93a 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c

@@ -436,34 +436,32 @@ mt7530_pad_clk_setup(struct dsa_switch *ds, phy_interface_t interface)
 			     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));
+	/* Disable MT7530 core clock */
+	core_clear(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN);
 
-		/* 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 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);

-- 
2.30.2

Re: [PATCH net] net: dsa: mt7530: setup core clock even in TRGMII mode

From: Florian Fainelli <f.fainelli@gmail.com>
Date: 2021-03-11 03:22:08


On 3/10/2021 5:21 PM, Ilya Lipnitskiy wrote:

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 <redacted>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
-- 
Florian

[PATCH net,v2] net: dsa: mt7530: setup core clock even in TRGMII mode

From: Ilya Lipnitskiy <hidden>
Date: 2021-03-12 08:08:40

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 <redacted>
---
 drivers/net/dsa/mt7530.c | 52 +++++++++++++++++++---------------------
 1 file changed, 25 insertions(+), 27 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index f06f5fa2f898..9871d7cff93a 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c

@@ -436,34 +436,32 @@ mt7530_pad_clk_setup(struct dsa_switch *ds, phy_interface_t interface)
 			     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));
+	/* Disable MT7530 core clock */
+	core_clear(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN);
 
-		/* 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 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);

-- 
2.30.2

Re: [PATCH net,v2] net: dsa: mt7530: setup core clock even in TRGMII mode

From: René van Dorst <hidden>
Date: 2021-03-19 10:32:41

Quoting Ilya Lipnitskiy [off-list ref]:

quoted hunk

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 <redacted>
---
 drivers/net/dsa/mt7530.c | 52 +++++++++++++++++++---------------------
 1 file changed, 25 insertions(+), 27 deletions(-)

diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index f06f5fa2f898..9871d7cff93a 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c

@@ -436,34 +436,32 @@ mt7530_pad_clk_setup(struct dsa_switch *ds,

phy_interface_t interface)
 			     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));
+	/* Disable MT7530 core clock */
+	core_clear(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN);

-		/* 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 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);
--
2.30.2

Hi Ilya,

Thanks for fixing this issue.

I remember that Frank also had an issue with TRGMII on his MT7623 ARM board.
I never found why it did not work but this may be also fix his issue  
on the MT7623 devices.

Added Frank to CC.

Tested on Ubiquiti ER-X-SFP (MT7621) with and without TRGMII mode enabled.

Tested-by: René van Dorst <redacted>

Greats,

René

Aw: Re: [PATCH net,v2] net: dsa: mt7530: setup core clock even in TRGMII mode

From: Frank Wunderlich <hidden>
Date: 2021-03-19 12:51:22

Hi René,Ilya

Gesendet: Freitag, 19. März 2021 um 11:25 Uhr
Von: "René van Dorst" [off-list ref]
Hi Ilya,

Thanks for fixing this issue.

I remember that Frank also had an issue with TRGMII on his MT7623 ARM board.
I never found why it did not work but this may be also fix his issue  
on the MT7623 devices.

Added Frank to CC.

thanks for pointing me here. my issue was after getting trgmii working with phylink-patches (5.3) that i only got only 940Mbit over the switch/gmac0 (using multiple clients to one iperf3-server), trgmii afair supports ~2.1 Gbit/s, so nearly twice bandwidth possible in theory. this maybe can clock-related

I'm not sure if it is the same issue ilya fixes here, but i try to test this on my bananapi-r2

regards Frank

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