This is a note to let you know that I've just added the patch titled
net: bcmasp: Bring up unimac after PHY link up
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-bcmasp-bring-up-unimac-after-phy-link-up.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 852dd25681292e8ee431ef28f61b0e041f242429
Author: Justin Chen <justin.chen@xxxxxxxxxxxx>
Date: Mon Mar 25 12:30:24 2024 -0700
net: bcmasp: Bring up unimac after PHY link up
[ Upstream commit dfd222e2aef68818320a57b13a1c52a44c22bc80 ]
The unimac requires the PHY RX clk during reset or it may be put
into a bad state. Bring up the unimac after link up to ensure the
PHY RX clk exists.
Fixes: 490cb412007d ("net: bcmasp: Add support for ASP2.0 Ethernet controller")
Signed-off-by: Justin Chen <justin.chen@xxxxxxxxxxxx>
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
index 6ad1366270f79..78901e2e73032 100644
--- a/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
+++ b/drivers/net/ethernet/broadcom/asp2/bcmasp_intf.c
@@ -391,7 +391,9 @@ static void umac_reset(struct bcmasp_intf *intf)
umac_wl(intf, 0x0, UMC_CMD);
umac_wl(intf, UMC_CMD_SW_RESET, UMC_CMD);
usleep_range(10, 100);
- umac_wl(intf, 0x0, UMC_CMD);
+ /* We hold the umac in reset and bring it out of
+ * reset when phy link is up.
+ */
}
static void umac_set_hw_addr(struct bcmasp_intf *intf,
@@ -411,6 +413,8 @@ static void umac_enable_set(struct bcmasp_intf *intf, u32 mask,
u32 reg;
reg = umac_rl(intf, UMC_CMD);
+ if (reg & UMC_CMD_SW_RESET)
+ return;
if (enable)
reg |= mask;
else
@@ -429,7 +433,6 @@ static void umac_init(struct bcmasp_intf *intf)
umac_wl(intf, 0x800, UMC_FRM_LEN);
umac_wl(intf, 0xffff, UMC_PAUSE_CNTRL);
umac_wl(intf, 0x800, UMC_RX_MAX_PKT_SZ);
- umac_enable_set(intf, UMC_CMD_PROMISC, 1);
}
static int bcmasp_tx_poll(struct napi_struct *napi, int budget)
@@ -656,6 +659,12 @@ static void bcmasp_adj_link(struct net_device *dev)
UMC_CMD_HD_EN | UMC_CMD_RX_PAUSE_IGNORE |
UMC_CMD_TX_PAUSE_IGNORE);
reg |= cmd_bits;
+ if (reg & UMC_CMD_SW_RESET) {
+ reg &= ~UMC_CMD_SW_RESET;
+ umac_wl(intf, reg, UMC_CMD);
+ udelay(2);
+ reg |= UMC_CMD_TX_EN | UMC_CMD_RX_EN | UMC_CMD_PROMISC;
+ }
umac_wl(intf, reg, UMC_CMD);
intf->eee.eee_active = phy_init_eee(phydev, 0) >= 0;
@@ -1063,9 +1072,6 @@ static int bcmasp_netif_init(struct net_device *dev, bool phy_connect)
umac_init(intf);
- /* Disable the UniMAC RX/TX */
- umac_enable_set(intf, (UMC_CMD_RX_EN | UMC_CMD_TX_EN), 0);
-
umac_set_hw_addr(intf, dev->dev_addr);
intf->old_duplex = -1;
@@ -1085,9 +1091,6 @@ static int bcmasp_netif_init(struct net_device *dev, bool phy_connect)
bcmasp_enable_rx(intf, 1);
- /* Turn on UniMAC TX/RX */
- umac_enable_set(intf, (UMC_CMD_RX_EN | UMC_CMD_TX_EN), 1);
-
intf->crc_fwd = !!(umac_rl(intf, UMC_CMD) & UMC_CMD_CRC_FWD);
bcmasp_netif_start(dev);
@@ -1324,7 +1327,14 @@ static void bcmasp_suspend_to_wol(struct bcmasp_intf *intf)
if (intf->wolopts & WAKE_FILTER)
bcmasp_netfilt_suspend(intf);
- /* UniMAC receive needs to be turned on */
+ /* Bring UniMAC out of reset if needed and enable RX */
+ reg = umac_rl(intf, UMC_CMD);
+ if (reg & UMC_CMD_SW_RESET)
+ reg &= ~UMC_CMD_SW_RESET;
+
+ reg |= UMC_CMD_RX_EN | UMC_CMD_PROMISC;
+ umac_wl(intf, reg, UMC_CMD);
+
umac_enable_set(intf, UMC_CMD_RX_EN, 1);
if (intf->parent->wol_irq > 0) {
