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mediatek: add support for swapping the polarity on usxgmii interfaces 

This patch comes from the MTK SDK.

Signed-off-by: John Crispin <john@phrozen.org>
This commit is contained in:
John Crispin 2024-10-29 13:40:11 +01:00
parent cfe8e6e75f
commit ddfae94a14
1 changed files with 58 additions and 0 deletions
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58
target/linux/mediatek/patches-6.6/736-net-pcs-mtk_usxgmii-add-polarity-control.patch Normal file
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@ -0,0 +1,58 @@
diff --git a/drivers/net/pcs/pcs-mtk-usxgmii.c b/drivers/net/pcs/pcs-mtk-usxgmii.c
index 9af9035..9caab92 100644
--- a/drivers/net/pcs/pcs-mtk-usxgmii.c
+++ b/drivers/net/pcs/pcs-mtk-usxgmii.c
@@ -52,6 +52,12 @@
#define USXGMII_LPA GENMASK(15, 0)
#define USXGMII_LPA_LATCH BIT(31)
+/* Register to control PCS polarity */
+#define RG_PHY_TOP_CTRL0 0x82C
+#define USXGMII_PN_SWAP_MASK GENMASK(1, 0)
+#define USXGMII_PN_SWAP_RX BIT(1)
+#define USXGMII_PN_SWAP_TX BIT(0)
+
/* Register to read PCS link status */
#define RG_PCS_RX_STATUS0 0x904
#define RG_PCS_RX_STATUS_UPDATE BIT(16)
@@ -74,6 +80,7 @@ struct mtk_usxgmii_pcs {
struct clk *clk;
struct reset_control *reset;
phy_interface_t interface;
+ unsigned int polarity;
unsigned int neg_mode;
struct list_head node;
};
@@ -155,6 +162,10 @@ static int mtk_usxgmii_pcs_config(struct phylink_pcs *pcs, unsigned int neg_mode
mtk_usxgmii_reset(mpcs);
+ /* Configure the interface polarity */
+ mtk_m32(mpcs, RG_PHY_TOP_CTRL0,
+ USXGMII_PN_SWAP_MASK, mpcs->polarity);
+
/* Setup USXGMII AN ctrl */
mtk_m32(mpcs, RG_PCS_AN_CTRL0,
USXGMII_AN_SYNC_CNT | USXGMII_AN_ENABLE,
@@ -332,6 +343,7 @@ static const struct phylink_pcs_ops mtk_usxgmii_pcs_ops = {
static int mtk_usxgmii_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
struct mtk_usxgmii_pcs *mpcs;
mpcs = devm_kzalloc(dev, sizeof(*mpcs), GFP_KERNEL);
@@ -342,6 +354,13 @@ static int mtk_usxgmii_probe(struct platform_device *pdev)
if (IS_ERR(mpcs->base))
return PTR_ERR(mpcs->base);
+ if (of_property_read_bool(np->parent, "mediatek,pnswap"))
+ mpcs->polarity = USXGMII_PN_SWAP_TX | USXGMII_PN_SWAP_RX;
+ else if (of_property_read_bool(np, "mediatek,pnswap-tx"))
+ mpcs->polarity = USXGMII_PN_SWAP_TX;
+ else if (of_property_read_bool(np, "mediatek,pnswap-rx"))
+ mpcs->polarity = USXGMII_PN_SWAP_RX;
+
mpcs->dev = dev;
mpcs->pcs.ops = &mtk_usxgmii_pcs_ops;
mpcs->pcs.poll = true;