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Message-Id: <20230331214549.756660-11-ahalaney@redhat.com>
Date: Fri, 31 Mar 2023 16:45:47 -0500
From: Andrew Halaney <ahalaney@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
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Andrew Halaney <ahalaney@...hat.com>
Subject: [PATCH net-next v3 10/12] net: stmmac: dwmac-qcom-ethqos: Respect phy-mode and TX delay
The driver currently sets a MAC TX delay of 2 ns no matter what the
phy-mode is. If the phy-mode indicates the phy is in charge of the
TX delay (rgmii-txid, rgmii-id), don't do it in the MAC.
Signed-off-by: Andrew Halaney <ahalaney@...hat.com>
---
Changes since v2:
* Fix spacing, reverse xmas tree (Jakub)
Changes since v1:
* Use a consistent subject prefix with other stmmac changes in series (myself)
.../stmicro/stmmac/dwmac-qcom-ethqos.c | 20 ++++++++++++++-----
1 file changed, 15 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
index 32763566c214..abec6dd27992 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
@@ -279,6 +279,17 @@ static int ethqos_dll_configure(struct qcom_ethqos *ethqos)
static int ethqos_rgmii_macro_init(struct qcom_ethqos *ethqos)
{
+ int phase_shift;
+ int phy_mode;
+
+ /* Determine if the PHY adds a 2 ns TX delay or the MAC handles it */
+ phy_mode = device_get_phy_mode(ðqos->pdev->dev);
+ if (phy_mode == PHY_INTERFACE_MODE_RGMII_ID ||
+ phy_mode == PHY_INTERFACE_MODE_RGMII_TXID)
+ phase_shift = 0;
+ else
+ phase_shift = RGMII_CONFIG2_TX_CLK_PHASE_SHIFT_EN;
+
/* Disable loopback mode */
rgmii_updatel(ethqos, RGMII_CONFIG2_TX_TO_RX_LOOPBACK_EN,
0, RGMII_IO_MACRO_CONFIG2);
@@ -300,9 +311,9 @@ static int ethqos_rgmii_macro_init(struct qcom_ethqos *ethqos)
RGMII_CONFIG_PROG_SWAP, RGMII_IO_MACRO_CONFIG);
rgmii_updatel(ethqos, RGMII_CONFIG2_DATA_DIVIDE_CLK_SEL,
0, RGMII_IO_MACRO_CONFIG2);
+
rgmii_updatel(ethqos, RGMII_CONFIG2_TX_CLK_PHASE_SHIFT_EN,
- RGMII_CONFIG2_TX_CLK_PHASE_SHIFT_EN,
- RGMII_IO_MACRO_CONFIG2);
+ phase_shift, RGMII_IO_MACRO_CONFIG2);
rgmii_updatel(ethqos, RGMII_CONFIG2_RSVD_CONFIG15,
0, RGMII_IO_MACRO_CONFIG2);
rgmii_updatel(ethqos, RGMII_CONFIG2_RX_PROG_SWAP,
@@ -336,8 +347,7 @@ static int ethqos_rgmii_macro_init(struct qcom_ethqos *ethqos)
rgmii_updatel(ethqos, RGMII_CONFIG2_DATA_DIVIDE_CLK_SEL,
0, RGMII_IO_MACRO_CONFIG2);
rgmii_updatel(ethqos, RGMII_CONFIG2_TX_CLK_PHASE_SHIFT_EN,
- RGMII_CONFIG2_TX_CLK_PHASE_SHIFT_EN,
- RGMII_IO_MACRO_CONFIG2);
+ phase_shift, RGMII_IO_MACRO_CONFIG2);
rgmii_updatel(ethqos, RGMII_CONFIG_MAX_SPD_PRG_2,
BIT(6), RGMII_IO_MACRO_CONFIG);
rgmii_updatel(ethqos, RGMII_CONFIG2_RSVD_CONFIG15,
@@ -375,7 +385,7 @@ static int ethqos_rgmii_macro_init(struct qcom_ethqos *ethqos)
rgmii_updatel(ethqos, RGMII_CONFIG2_DATA_DIVIDE_CLK_SEL,
0, RGMII_IO_MACRO_CONFIG2);
rgmii_updatel(ethqos, RGMII_CONFIG2_TX_CLK_PHASE_SHIFT_EN,
- 0, RGMII_IO_MACRO_CONFIG2);
+ phase_shift, RGMII_IO_MACRO_CONFIG2);
rgmii_updatel(ethqos, RGMII_CONFIG_MAX_SPD_PRG_9,
BIT(12) | GENMASK(9, 8),
RGMII_IO_MACRO_CONFIG);
--
2.39.2
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