net: mtk_eth_soc: add pcs_get_state() implementation

Add a pcs_get_state() implementation which uses the advertisements
to compute the resulting link modes, and BMSR contents to determine
negotiation and link status.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/mediatek/mtk_sgmii.c b/drivers/net/ethernet/mediatek/mtk_sgmii.c
index 7637ba1..63785bd 100644 (file)
--- a/drivers/net/ethernet/mediatek/mtk_sgmii.c
+++ b/drivers/net/ethernet/mediatek/mtk_sgmii.c
@@ -19,6 +19,20 @@ static struct mtk_pcs *pcs_to_mtk_pcs(struct phylink_pcs *pcs)
        return container_of(pcs, struct mtk_pcs, pcs);
 }
 
+static void mtk_pcs_get_state(struct phylink_pcs *pcs,
+                             struct phylink_link_state *state)
+{
+       struct mtk_pcs *mpcs = pcs_to_mtk_pcs(pcs);
+       unsigned int bm, adv;
+
+       /* Read the BMSR and LPA */
+       regmap_read(mpcs->regmap, SGMSYS_PCS_CONTROL_1, &bm);
+       regmap_read(mpcs->regmap, SGMSYS_PCS_ADVERTISE, &adv);
+
+       phylink_mii_c22_pcs_decode_state(state, FIELD_GET(SGMII_BMSR, bm),
+                                        FIELD_GET(SGMII_LPA, adv));
+}
+
 /* For SGMII interface mode */
 static void mtk_pcs_setup_mode_an(struct mtk_pcs *mpcs)
 {
@@ -117,6 +131,7 @@ static void mtk_pcs_link_up(struct phylink_pcs *pcs, unsigned int mode,
 }
 
 static const struct phylink_pcs_ops mtk_pcs_ops = {
+       .pcs_get_state = mtk_pcs_get_state,
        .pcs_config = mtk_pcs_config,
        .pcs_an_restart = mtk_pcs_restart_an,
        .pcs_link_up = mtk_pcs_link_up,