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[RFC,net-next,v4,14/14] net: stmmac: Activate Inband/PCS flag based on the selected iface

Message ID E1sauuS-000tvz-6E@rmk-PC.armlinux.org.uk (mailing list archive)
State RFC
Delegated to: Netdev Maintainers
Headers show
Series net: stmmac: convert stmmac "pcs" to phylink | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next, async
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: 29 this patch: 29
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 10 of 10 maintainers
netdev/build_clang success Errors and warnings before: 29 this patch: 29
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: 29 this patch: 29
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 22 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 38 this patch: 38
netdev/source_inline success Was 0 now: 0

Commit Message

Russell King (Oracle) Aug. 5, 2024, 10:25 a.m. UTC 
From: Serge Semin <fancer.lancer@gmail.com>

The HWFEATURE.PCSSEL flag is set if the PCS block has been synthesized
into the DW GMAC controller. It's always done if the controller supports
at least one of the SGMII, TBI, RTBI PHY interfaces. If none of these
interfaces support was activated during the IP-core synthesize the PCS
block won't be activated either and the HWFEATURE.PCSSEL flag won't be
set. Based on that the RGMII in-band status detection procedure
implemented in the driver hasn't been working for the devices with the
RGMII interface support and with none of the SGMII, TBI, RTBI PHY
interfaces available in the device.

Fix that just by dropping the dma_cap.pcs flag check from the conditional
statement responsible for the In-band/PCS functionality activation. If the
RGMII interface is supported by the device then the in-band link status
detection will be also supported automatically (it's always embedded into
the RGMII RTL code). If the SGMII interface is supported by the device
then the PCS block will be supported too (it's unconditionally synthesized
into the controller). The later is also correct for the TBI/RTBI PHY
interfaces.

Note while at it drop the netdev_dbg() calls since at the moment of the
stmmac_check_pcs_mode() invocation the network device isn't registered. So
the debug prints will be for the unknown/NULL device.

Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
[rmk: fix build errors, only use PCS for SGMII if priv->dma_cap.pcs is set]
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/stmmac_main.c    | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index a57f5028d8aa..4fd9daecef09 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1133,18 +1133,10 @@  static void stmmac_check_pcs_mode(struct stmmac_priv *priv)
 {
 	int interface = priv->plat->mac_interface;
 
-	if (priv->dma_cap.pcs) {
-		if ((interface == PHY_INTERFACE_MODE_RGMII) ||
-		    (interface == PHY_INTERFACE_MODE_RGMII_ID) ||
-		    (interface == PHY_INTERFACE_MODE_RGMII_RXID) ||
-		    (interface == PHY_INTERFACE_MODE_RGMII_TXID)) {
-			netdev_dbg(priv->dev, "PCS RGMII support enabled\n");
-			priv->hw->pcs = STMMAC_PCS_RGMII;
-		} else if (interface == PHY_INTERFACE_MODE_SGMII) {
-			netdev_dbg(priv->dev, "PCS SGMII support enabled\n");
-			priv->hw->pcs = STMMAC_PCS_SGMII;
-		}
-	}
+	if (phy_interface_mode_is_rgmii(interface))
+		priv->hw->pcs = STMMAC_PCS_RGMII;
+	else if (priv->dma_cap.pcs && interface == PHY_INTERFACE_MODE_SGMII)
+		priv->hw->pcs = STMMAC_PCS_SGMII;
 }
 
 /**