diff mbox series

[net-next,v3,1/2] net: dsa: vsc73xx: make RGMII delays configurable

Message ID 20240729210200.279798-1-paweldembicki@gmail.com (mailing list archive)
State Accepted
Commit 3b91b03271c5dbf156301ff5028b36925f00e102
Delegated to: Netdev Maintainers
Headers show
Series [net-next,v3,1/2] net: dsa: vsc73xx: make RGMII delays configurable | expand

Checks

Context Check Description
netdev/series_format success Single patches do not need cover letters
netdev/tree_selection success Clearly marked for net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 42 this patch: 42
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 7 of 7 maintainers
netdev/build_clang success Errors and warnings before: 43 this patch: 43
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 43 this patch: 43
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 82 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest success net-next-2024-07-31--09-00 (tests: 706)

Commit Message

Pawel Dembicki July 29, 2024, 9:01 p.m. UTC 
This patch switches hardcoded RGMII transmit/receive delay to
a configurable value. Delay values are taken from the properties of
the CPU port: 'tx-internal-delay-ps' and 'rx-internal-delay-ps'.

The default value is configured to 2.0 ns to maintain backward
compatibility with existing code.

Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>

---
v3:
  - added 'Reviewed-by:' only
v2:
  - return -EINVAL when value is wrong
  - info about default value are silenced
---
 drivers/net/dsa/vitesse-vsc73xx-core.c | 70 ++++++++++++++++++++++++--
 1 file changed, 66 insertions(+), 4 deletions(-)

Comments

patchwork-bot+netdevbpf@kernel.org July 31, 2024, 9:30 a.m. UTC | #1 
Hello:

This series was applied to netdev/net-next.git (main)
by David S. Miller <davem@davemloft.net>:

On Mon, 29 Jul 2024 23:01:59 +0200 you wrote:
> This patch switches hardcoded RGMII transmit/receive delay to
> a configurable value. Delay values are taken from the properties of
> the CPU port: 'tx-internal-delay-ps' and 'rx-internal-delay-ps'.
> 
> The default value is configured to 2.0 ns to maintain backward
> compatibility with existing code.
> 
> [...]

Here is the summary with links:
  - [net-next,v3,1/2] net: dsa: vsc73xx: make RGMII delays configurable
    https://git.kernel.org/netdev/net-next/c/3b91b03271c5
  - [net-next,v3,2/2] dt-bindings: net: dsa: vsc73xx: add {rx,tx}-internal-delay-ps
    https://git.kernel.org/netdev/net-next/c/b735154aeb33

You are awesome, thank you!
diff mbox series

Patch

diff --git a/drivers/net/dsa/vitesse-vsc73xx-core.c b/drivers/net/dsa/vitesse-vsc73xx-core.c
index d9d3e30fd47a..07b704a1557e 100644
--- a/drivers/net/dsa/vitesse-vsc73xx-core.c
+++ b/drivers/net/dsa/vitesse-vsc73xx-core.c
@@ -684,6 +684,67 @@  vsc73xx_update_vlan_table(struct vsc73xx *vsc, int port, u16 vid, bool set)
 	return vsc73xx_write_vlan_table_entry(vsc, vid, portmap);
 }
 
+static int vsc73xx_configure_rgmii_port_delay(struct dsa_switch *ds)
+{
+	/* Keep 2.0 ns delay for backward complatibility */
+	u32 tx_delay = VSC73XX_GMIIDELAY_GMII0_GTXDELAY_2_0_NS;
+	u32 rx_delay = VSC73XX_GMIIDELAY_GMII0_RXDELAY_2_0_NS;
+	struct dsa_port *dp = dsa_to_port(ds, CPU_PORT);
+	struct device_node *port_dn = dp->dn;
+	struct vsc73xx *vsc = ds->priv;
+	u32 delay;
+
+	if (!of_property_read_u32(port_dn, "tx-internal-delay-ps", &delay)) {
+		switch (delay) {
+		case 0:
+			tx_delay = VSC73XX_GMIIDELAY_GMII0_GTXDELAY_NONE;
+			break;
+		case 1400:
+			tx_delay = VSC73XX_GMIIDELAY_GMII0_GTXDELAY_1_4_NS;
+			break;
+		case 1700:
+			tx_delay = VSC73XX_GMIIDELAY_GMII0_GTXDELAY_1_7_NS;
+			break;
+		case 2000:
+			break;
+		default:
+			dev_err(vsc->dev,
+				"Unsupported RGMII Transmit Clock Delay\n");
+			return -EINVAL;
+		}
+	} else {
+		dev_dbg(vsc->dev,
+			"RGMII Transmit Clock Delay isn't configured, set to 2.0 ns\n");
+	}
+
+	if (!of_property_read_u32(port_dn, "rx-internal-delay-ps", &delay)) {
+		switch (delay) {
+		case 0:
+			rx_delay = VSC73XX_GMIIDELAY_GMII0_RXDELAY_NONE;
+			break;
+		case 1400:
+			rx_delay = VSC73XX_GMIIDELAY_GMII0_RXDELAY_1_4_NS;
+			break;
+		case 1700:
+			rx_delay = VSC73XX_GMIIDELAY_GMII0_RXDELAY_1_7_NS;
+			break;
+		case 2000:
+			break;
+		default:
+			dev_err(vsc->dev,
+				"Unsupported RGMII Receive Clock Delay value\n");
+			return -EINVAL;
+		}
+	} else {
+		dev_dbg(vsc->dev,
+			"RGMII Receive Clock Delay isn't configured, set to 2.0 ns\n");
+	}
+
+	/* MII delay, set both GTX and RX delay */
+	return vsc73xx_write(vsc, VSC73XX_BLOCK_SYSTEM, 0, VSC73XX_GMIIDELAY,
+			     tx_delay | rx_delay);
+}
+
 static int vsc73xx_setup(struct dsa_switch *ds)
 {
 	struct vsc73xx *vsc = ds->priv;
@@ -746,10 +807,11 @@  static int vsc73xx_setup(struct dsa_switch *ds)
 			      VSC73XX_MAC_CFG, VSC73XX_MAC_CFG_RESET);
 	}
 
-	/* MII delay, set both GTX and RX delay to 2 ns */
-	vsc73xx_write(vsc, VSC73XX_BLOCK_SYSTEM, 0, VSC73XX_GMIIDELAY,
-		      VSC73XX_GMIIDELAY_GMII0_GTXDELAY_2_0_NS |
-		      VSC73XX_GMIIDELAY_GMII0_RXDELAY_2_0_NS);
+	/* Configure RGMII delay */
+	ret = vsc73xx_configure_rgmii_port_delay(ds);
+	if (ret)
+		return ret;
+
 	/* Ingess VLAN reception mask (table 145) */
 	vsc73xx_write(vsc, VSC73XX_BLOCK_ANALYZER, 0, VSC73XX_VLANMASK,
 		      0xff);