bgmac: fix *initial* chip reset to support BCM5358

While bringing hardware up we should perform a full reset including the
switch bit (BGMAC_BCMA_IOCTL_SW_RESET aka SICF_SWRST). It's what
specification says and what reference driver does.

This seems to be critical for the BCM5358. Without this hardware doesn't
get initialized properly and doesn't seem to transmit or receive any
packets.

Originally bgmac was calling bgmac_chip_reset() before setting
"has_robosw" property which resulted in expected behaviour. That has
changed as a side effect of adding platform device support which
regressed BCM5358 support.

Fixes: f6a95a24957a ("net: ethernet: bgmac: Add platform device support")
Cc: Jon Mason <jdmason@kudzu.us>
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20230227091156.19509-1-zajec5@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
index 3038386a5afd8c4297c801fb9c1642eb6a25f7c5..1761df8fb7f96888017e0a4f7cad0c22aad67c77 100644 (file)
--- a/drivers/net/ethernet/broadcom/bgmac.c
+++ b/drivers/net/ethernet/broadcom/bgmac.c
@@ -890,13 +890,13 @@ static void bgmac_chip_reset_idm_config(struct bgmac *bgmac)
 
                if (iost & BGMAC_BCMA_IOST_ATTACHED) {
                        flags = BGMAC_BCMA_IOCTL_SW_CLKEN;
-                       if (!bgmac->has_robosw)
+                       if (bgmac->in_init || !bgmac->has_robosw)
                                flags |= BGMAC_BCMA_IOCTL_SW_RESET;
                }
                bgmac_clk_enable(bgmac, flags);
        }
 
-       if (iost & BGMAC_BCMA_IOST_ATTACHED && !bgmac->has_robosw)
+       if (iost & BGMAC_BCMA_IOST_ATTACHED && (bgmac->in_init || !bgmac->has_robosw))
                bgmac_idm_write(bgmac, BCMA_IOCTL,
                                bgmac_idm_read(bgmac, BCMA_IOCTL) &
                                ~BGMAC_BCMA_IOCTL_SW_RESET);
@@ -1490,6 +1490,8 @@ int bgmac_enet_probe(struct bgmac *bgmac)
        struct net_device *net_dev = bgmac->net_dev;
        int err;
 
+       bgmac->in_init = true;
+
        bgmac_chip_intrs_off(bgmac);
 
        net_dev->irq = bgmac->irq;
@@ -1542,6 +1544,8 @@ int bgmac_enet_probe(struct bgmac *bgmac)
        /* Omit FCS from max MTU size */
        net_dev->max_mtu = BGMAC_RX_MAX_FRAME_SIZE - ETH_FCS_LEN;
 
+       bgmac->in_init = false;
+
        err = register_netdev(bgmac->net_dev);
        if (err) {
                dev_err(bgmac->dev, "Cannot register net device\n");

diff --git a/drivers/net/ethernet/broadcom/bgmac.h b/drivers/net/ethernet/broadcom/bgmac.h
index e05ac92c0650406012915460ea22c96743bcf128..d73ef262991d61a13ddedaf288678386ebb4d256 100644 (file)
--- a/drivers/net/ethernet/broadcom/bgmac.h
+++ b/drivers/net/ethernet/broadcom/bgmac.h
@@ -472,6 +472,8 @@ struct bgmac {
        int irq;
        u32 int_mask;
 
+       bool in_init;
+
        /* Current MAC state */
        int mac_speed;
        int mac_duplex;