This is a note to let you know that I've just added the patch titled
net: stmmac: qcom-ethqos: enable SGMII loopback during DMA reset on sa8775p-ride-r3
to the 6.6-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-stmmac-qcom-ethqos-enable-sgmii-loopback-during-.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7b700098c7713e8ec33c69a3e28641f6920cfaad
Author: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
Date: Wed Jul 3 20:14:59 2024 +0200
net: stmmac: qcom-ethqos: enable SGMII loopback during DMA reset on sa8775p-ride-r3
[ Upstream commit 3c466d6537b99f801b3f68af3d8124d4312437a0 ]
On sa8775p-ride-r3 the RX clocks from the AQR115C PHY are not available at
the time of the DMA reset. We can however extract the RX clock from the
internal SERDES block. Once the link is up, we can revert to the
previous state.
The AQR115C PHY doesn't support in-band signalling so we can count on
getting the link up notification and safely reuse existing callbacks
which are already used by another HW quirk workaround which enables the
functional clock to avoid a DMA reset due to timeout.
Only enable loopback on revision 3 of the board - check the phy_mode to
make sure.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
Reviewed-by: Andrew Lunn <andrew@xxxxxxx>
Link: https://patch.msgid.link/20240703181500.28491-3-brgl@xxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
index d5d2a4c776c1c..ded1bbda5266f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
@@ -21,6 +21,7 @@
#define RGMII_IO_MACRO_CONFIG2 0x1C
#define RGMII_IO_MACRO_DEBUG1 0x20
#define EMAC_SYSTEM_LOW_POWER_DEBUG 0x28
+#define EMAC_WRAPPER_SGMII_PHY_CNTRL1 0xf4
/* RGMII_IO_MACRO_CONFIG fields */
#define RGMII_CONFIG_FUNC_CLK_EN BIT(30)
@@ -79,6 +80,9 @@
#define ETHQOS_MAC_CTRL_SPEED_MODE BIT(14)
#define ETHQOS_MAC_CTRL_PORT_SEL BIT(15)
+/* EMAC_WRAPPER_SGMII_PHY_CNTRL1 bits */
+#define SGMII_PHY_CNTRL1_SGMII_TX_TO_RX_LOOPBACK_EN BIT(3)
+
#define SGMII_10M_RX_CLK_DVDR 0x31
struct ethqos_emac_por {
@@ -95,6 +99,7 @@ struct ethqos_emac_driver_data {
bool has_integrated_pcs;
u32 dma_addr_width;
struct dwmac4_addrs dwmac4_addrs;
+ bool needs_sgmii_loopback;
};
struct qcom_ethqos {
@@ -113,6 +118,7 @@ struct qcom_ethqos {
unsigned int num_por;
bool rgmii_config_loopback_en;
bool has_emac_ge_3;
+ bool needs_sgmii_loopback;
};
static int rgmii_readl(struct qcom_ethqos *ethqos, unsigned int offset)
@@ -187,8 +193,22 @@ ethqos_update_link_clk(struct qcom_ethqos *ethqos, unsigned int speed)
clk_set_rate(ethqos->link_clk, ethqos->link_clk_rate);
}
+static void
+qcom_ethqos_set_sgmii_loopback(struct qcom_ethqos *ethqos, bool enable)
+{
+ if (!ethqos->needs_sgmii_loopback ||
+ ethqos->phy_mode != PHY_INTERFACE_MODE_2500BASEX)
+ return;
+
+ rgmii_updatel(ethqos,
+ SGMII_PHY_CNTRL1_SGMII_TX_TO_RX_LOOPBACK_EN,
+ enable ? SGMII_PHY_CNTRL1_SGMII_TX_TO_RX_LOOPBACK_EN : 0,
+ EMAC_WRAPPER_SGMII_PHY_CNTRL1);
+}
+
static void ethqos_set_func_clk_en(struct qcom_ethqos *ethqos)
{
+ qcom_ethqos_set_sgmii_loopback(ethqos, true);
rgmii_updatel(ethqos, RGMII_CONFIG_FUNC_CLK_EN,
RGMII_CONFIG_FUNC_CLK_EN, RGMII_IO_MACRO_CONFIG);
}
@@ -273,6 +293,7 @@ static const struct ethqos_emac_driver_data emac_v4_0_0_data = {
.has_emac_ge_3 = true,
.link_clk_name = "phyaux",
.has_integrated_pcs = true,
+ .needs_sgmii_loopback = true,
.dma_addr_width = 36,
.dwmac4_addrs = {
.dma_chan = 0x00008100,
@@ -646,6 +667,7 @@ static void ethqos_fix_mac_speed(void *priv, unsigned int speed, unsigned int mo
{
struct qcom_ethqos *ethqos = priv;
+ qcom_ethqos_set_sgmii_loopback(ethqos, false);
ethqos->speed = speed;
ethqos_update_link_clk(ethqos, speed);
ethqos_configure(ethqos);
@@ -781,6 +803,7 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
ethqos->num_por = data->num_por;
ethqos->rgmii_config_loopback_en = data->rgmii_config_loopback_en;
ethqos->has_emac_ge_3 = data->has_emac_ge_3;
+ ethqos->needs_sgmii_loopback = data->needs_sgmii_loopback;
ethqos->link_clk = devm_clk_get(dev, data->link_clk_name ?: "rgmii");
if (IS_ERR(ethqos->link_clk))
