[PATCH net-next v2 3/7] net: stmmac: mediatek: add RX/TX delay stage divider in platform data

[Louis-Alexis Eyraud <louisalexis.eyraud@collabora.com>]

In preparation of newer SoC support, that have like MT8189 SoC
different RX and TX internal delay stage steps than MT8188/MT8195, add
the RX and TX delay stage divider values in the variant platform data
and replace the hardcoded value use in mt8195_set_delay.

Signed-off-by: Louis-Alexis Eyraud <louisalexis.eyraud@collabora.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
index f7eb85110df0..1c532cc3a975 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
@@ -100,6 +100,8 @@ struct mediatek_dwmac_variant {
 
 	u32 rx_delay_max;
 	u32 tx_delay_max;
+	u16 rx_delay_stage_div;
+	u16 tx_delay_stage_div;
 	u8 dma_bit_mask;
 };
 
@@ -300,13 +302,25 @@ static int mt8195_set_interface(struct mediatek_dwmac_plat_data *plat,
 
 static int mt8195_set_delay(struct mediatek_dwmac_plat_data *plat)
 {
+	u16 rx_delay_stage_div = plat->variant->rx_delay_stage_div;
+	u16 tx_delay_stage_div = plat->variant->tx_delay_stage_div;
 	struct mac_delay_struct *mac_delay = &plat->mac_delay;
-	u32 rx_delay_stage_val = mac_delay->rx_delay / MT8195_DLY_RXC_STAGE_DIV;
-	u32 tx_delay_stage_val = mac_delay->tx_delay / MT8195_DLY_TXC_STAGE_DIV;
+	u32 rx_delay_stage_val;
+	u32 tx_delay_stage_val;
 	u32 gtxc_delay_val = 0;
 	u32 rmii_delay_val = 0;
 	u32 delay_val = 0;
 
+	if (rx_delay_stage_div)
+		rx_delay_stage_val = mac_delay->rx_delay / rx_delay_stage_div;
+	else
+		rx_delay_stage_val = 0;
+
+	if (tx_delay_stage_div)
+		tx_delay_stage_val = mac_delay->tx_delay / tx_delay_stage_div;
+	else
+		tx_delay_stage_val = 0;
+
 	switch (plat->phy_mode) {
 	case PHY_INTERFACE_MODE_MII:
 		delay_val |= FIELD_PREP(MT8195_DLY_TXC_ENABLE,
@@ -415,6 +429,8 @@ static const struct mediatek_dwmac_variant mt8195_gmac_variant = {
 	.num_clks = ARRAY_SIZE(mt8195_dwmac_clk_l),
 	.rx_delay_max = MT8195_DLY_RXC_MAX,
 	.tx_delay_max = MT8195_DLY_TXC_MAX,
+	.rx_delay_stage_div = MT8195_DLY_RXC_STAGE_DIV,
+	.tx_delay_stage_div = MT8195_DLY_TXC_STAGE_DIV,
 	.dma_bit_mask = 35,
 };
 

-- 
2.55.0