This is a note to let you know that I've just added the patch titled
net: phy: mscc: enable VSC8501/2 RGMII RX clock
to the 5.15-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-phy-mscc-enable-vsc8501-2-rgmii-rx-clock.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f43df598d867e5a7cad59723e565f87cb1acbc6a
Author: David Epping <david.epping@xxxxxxxxxxxxxxxxxxxxxxxxxx>
Date: Tue May 23 17:31:08 2023 +0200
net: phy: mscc: enable VSC8501/2 RGMII RX clock
[ Upstream commit 71460c9ec5c743e9ffffca3c874d66267c36345e ]
By default the VSC8501 and VSC8502 RGMII/GMII/MII RX_CLK output is
disabled. To allow packet forwarding towards the MAC it needs to be
enabled.
For other PHYs supported by this driver the clock output is enabled
by default.
Fixes: d3169863310d ("net: phy: mscc: add support for VSC8502")
Signed-off-by: David Epping <david.epping@xxxxxxxxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx>
Reviewed-by: Vladimir Oltean <olteanv@xxxxxxxxx>
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/phy/mscc/mscc.h b/drivers/net/phy/mscc/mscc.h
index a50235fdf7d99..055e4ca5b3b5c 100644
--- a/drivers/net/phy/mscc/mscc.h
+++ b/drivers/net/phy/mscc/mscc.h
@@ -179,6 +179,7 @@ enum rgmii_clock_delay {
#define VSC8502_RGMII_CNTL 20
#define VSC8502_RGMII_RX_DELAY_MASK 0x0070
#define VSC8502_RGMII_TX_DELAY_MASK 0x0007
+#define VSC8502_RGMII_RX_CLK_DISABLE 0x0800
#define MSCC_PHY_WOL_LOWER_MAC_ADDR 21
#define MSCC_PHY_WOL_MID_MAC_ADDR 22
diff --git a/drivers/net/phy/mscc/mscc_main.c b/drivers/net/phy/mscc/mscc_main.c
index 74f3aa752724f..cef43b1344a94 100644
--- a/drivers/net/phy/mscc/mscc_main.c
+++ b/drivers/net/phy/mscc/mscc_main.c
@@ -527,14 +527,27 @@ static int vsc85xx_mac_if_set(struct phy_device *phydev,
* * 2.0 ns (which causes the data to be sampled at exactly half way between
* clock transitions at 1000 Mbps) if delays should be enabled
*/
-static int vsc85xx_rgmii_set_skews(struct phy_device *phydev, u32 rgmii_cntl,
- u16 rgmii_rx_delay_mask,
- u16 rgmii_tx_delay_mask)
+static int vsc85xx_update_rgmii_cntl(struct phy_device *phydev, u32 rgmii_cntl,
+ u16 rgmii_rx_delay_mask,
+ u16 rgmii_tx_delay_mask)
{
u16 rgmii_rx_delay_pos = ffs(rgmii_rx_delay_mask) - 1;
u16 rgmii_tx_delay_pos = ffs(rgmii_tx_delay_mask) - 1;
u16 reg_val = 0;
- int rc;
+ u16 mask = 0;
+ int rc = 0;
+
+ /* For traffic to pass, the VSC8502 family needs the RX_CLK disable bit
+ * to be unset for all PHY modes, so do that as part of the paged
+ * register modification.
+ * For some family members (like VSC8530/31/40/41) this bit is reserved
+ * and read-only, and the RX clock is enabled by default.
+ */
+ if (rgmii_cntl == VSC8502_RGMII_CNTL)
+ mask |= VSC8502_RGMII_RX_CLK_DISABLE;
+
+ if (phy_interface_is_rgmii(phydev))
+ mask |= rgmii_rx_delay_mask | rgmii_tx_delay_mask;
mutex_lock(&phydev->lock);
@@ -545,10 +558,9 @@ static int vsc85xx_rgmii_set_skews(struct phy_device *phydev, u32 rgmii_cntl,
phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
reg_val |= RGMII_CLK_DELAY_2_0_NS << rgmii_tx_delay_pos;
- rc = phy_modify_paged(phydev, MSCC_PHY_PAGE_EXTENDED_2,
- rgmii_cntl,
- rgmii_rx_delay_mask | rgmii_tx_delay_mask,
- reg_val);
+ if (mask)
+ rc = phy_modify_paged(phydev, MSCC_PHY_PAGE_EXTENDED_2,
+ rgmii_cntl, mask, reg_val);
mutex_unlock(&phydev->lock);
@@ -557,19 +569,11 @@ static int vsc85xx_rgmii_set_skews(struct phy_device *phydev, u32 rgmii_cntl,
static int vsc85xx_default_config(struct phy_device *phydev)
{
- int rc;
-
phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
- if (phy_interface_mode_is_rgmii(phydev->interface)) {
- rc = vsc85xx_rgmii_set_skews(phydev, VSC8502_RGMII_CNTL,
- VSC8502_RGMII_RX_DELAY_MASK,
- VSC8502_RGMII_TX_DELAY_MASK);
- if (rc)
- return rc;
- }
-
- return 0;
+ return vsc85xx_update_rgmii_cntl(phydev, VSC8502_RGMII_CNTL,
+ VSC8502_RGMII_RX_DELAY_MASK,
+ VSC8502_RGMII_TX_DELAY_MASK);
}
static int vsc85xx_get_tunable(struct phy_device *phydev,
@@ -1766,13 +1770,11 @@ static int vsc8584_config_init(struct phy_device *phydev)
if (ret)
return ret;
- if (phy_interface_is_rgmii(phydev)) {
- ret = vsc85xx_rgmii_set_skews(phydev, VSC8572_RGMII_CNTL,
- VSC8572_RGMII_RX_DELAY_MASK,
- VSC8572_RGMII_TX_DELAY_MASK);
- if (ret)
- return ret;
- }
+ ret = vsc85xx_update_rgmii_cntl(phydev, VSC8572_RGMII_CNTL,
+ VSC8572_RGMII_RX_DELAY_MASK,
+ VSC8572_RGMII_TX_DELAY_MASK);
+ if (ret)
+ return ret;
ret = genphy_soft_reset(phydev);
if (ret)
