[PATCH 1/2] net: designware-imx: add fix_reset callback

[Steffen Trumtrar <s.trumtrar@pengutronix.de>]

The i.MX93 needs to set the RMII speed to successfully reset. Add a
callback that does this inspired by the linux patch:

    net: stmmac: dwmac-imx: use platform specific reset for imx93 SoCs

Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
---
 drivers/net/designware_eqos.c |  3 +++
 drivers/net/designware_eqos.h |  1 +
 drivers/net/designware_imx.c  | 21 +++++++++++++++++++++
 3 files changed, 25 insertions(+)

diff --git a/drivers/net/designware_eqos.c b/drivers/net/designware_eqos.c
index ccce51b6af..4a97cbb75e 100644
--- a/drivers/net/designware_eqos.c
+++ b/drivers/net/designware_eqos.c
@@ -431,6 +431,9 @@ static int eqos_start(struct eth_device *edev)
 	 */
 	setbits_le32(&eqos->dma_regs->mode, EQOS_DMA_MODE_SWR);
 
+	if (eqos->ops->fix_reset)
+		eqos->ops->fix_reset(eqos, &eqos->mac_regs->config);
+
 	ret = readl_poll_timeout(&eqos->dma_regs->mode, mode_set,
 				 !(mode_set & EQOS_DMA_MODE_SWR),
 				 100 * USEC_PER_MSEC);
diff --git a/drivers/net/designware_eqos.h b/drivers/net/designware_eqos.h
index 951565e8f9..9f2fc2fe6d 100644
--- a/drivers/net/designware_eqos.h
+++ b/drivers/net/designware_eqos.h
@@ -14,6 +14,7 @@ struct eqos_ops {
 	int (*get_ethaddr)(struct eth_device *dev, unsigned char *mac);
 	int (*set_ethaddr)(struct eth_device *edev, const unsigned char *mac);
 	void (*adjust_link)(struct eth_device *edev);
+	void (*fix_reset)(struct eqos *, unsigned int *reg);
 	unsigned long (*get_csr_clk_rate)(struct eqos *);
 
 	bool enh_desc;
diff --git a/drivers/net/designware_imx.c b/drivers/net/designware_imx.c
index c281d3b64b..ab60d98298 100644
--- a/drivers/net/designware_imx.c
+++ b/drivers/net/designware_imx.c
@@ -24,8 +24,11 @@
 #define MX93_GPR_ENET_QOS_INTF_SEL_RGMII	(0x1 << 1)
 #define MX93_GPR_ENET_QOS_CLK_GEN_EN		(0x1 << 0)
 
+#define RMII_RESET_SPEED			(0x3 << 14)
+
 struct eqos_imx_soc_data {
 	int (*set_interface_mode)(struct eqos *eqos);
+	void (*fix_soc_reset)(struct eqos *eqos, u32 *mac_regs);
 	bool mac_rgmii_txclk_auto_adj;
 };
 
@@ -82,6 +85,22 @@ static int eqos_set_txclk(struct eqos *eqos, int speed)
 	return ret;
 }
 
+static void eqos_fix_reset(struct eqos *eqos, u32 *reg)
+{
+	struct eqos_imx_priv *priv = eqos->priv;
+
+	if (priv->soc_data->fix_soc_reset)
+		priv->soc_data->fix_soc_reset(eqos, reg);
+}
+
+static void eqos_imx93_reset(struct eqos *eqos, u32 *mac_reg)
+{
+	if (eqos->interface == PHY_INTERFACE_MODE_RMII) {
+		udelay(200);
+		setbits_le32(mac_reg, RMII_RESET_SPEED);
+	}
+}
+
 static void eqos_adjust_link_imx(struct eth_device *edev)
 {
 	struct eqos *eqos = edev->priv;
@@ -184,6 +203,7 @@ static struct eqos_ops imx_ops = {
 	.set_ethaddr = eqos_set_ethaddr,
 	.adjust_link = eqos_adjust_link_imx,
 	.get_csr_clk_rate = eqos_get_csr_clk_rate_imx,
+	.fix_reset = eqos_fix_reset,
 
 	.clk_csr = EQOS_MDIO_ADDR_CR_250_300,
 	.config_mac = EQOS_MAC_RXQ_CTRL0_RXQ0EN_ENABLED_DCB,
@@ -240,6 +260,7 @@ static void eqos_remove_imx(struct device *dev)
 
 static struct eqos_imx_soc_data imx93_soc_data = {
 	.set_interface_mode = eqos_imx93_set_interface_mode,
+	.fix_soc_reset = eqos_imx93_reset,
 	.mac_rgmii_txclk_auto_adj = true,
 };
 

-- 
2.43.2