This is a note to let you know that I've just added the patch titled
net: stmmac: dwmac-qcom-ethqos: Fix drops in 10M SGMII RX
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-dwmac-qcom-ethqos-fix-drops-in-10m-sgmii-.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 06aba8a79aed14f486bf2bb12c9983603d206373
Author: Sneh Shah <quic_snehshah@xxxxxxxxxxx>
Date: Tue Dec 12 14:52:08 2023 +0530
net: stmmac: dwmac-qcom-ethqos: Fix drops in 10M SGMII RX
[ Upstream commit 981d947bcd382c3950a593690e0e13d194d65b1c ]
In 10M SGMII mode all the packets are being dropped due to wrong Rx clock.
SGMII 10MBPS mode needs RX clock divider programmed to avoid drops in Rx.
Update configure SGMII function with Rx clk divider programming.
Fixes: 463120c31c58 ("net: stmmac: dwmac-qcom-ethqos: add support for SGMII")
Tested-by: Andrew Halaney <ahalaney@xxxxxxxxxx>
Signed-off-by: Sneh Shah <quic_snehshah@xxxxxxxxxxx>
Reviewed-by: Bjorn Andersson <quic_bjorande@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231212092208.22393-1-quic_snehshah@xxxxxxxxxxx
Signed-off-by: Paolo Abeni <pabeni@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 d3bf42d0fceb6..31631e3f89d0a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
@@ -34,6 +34,7 @@
#define RGMII_CONFIG_LOOPBACK_EN BIT(2)
#define RGMII_CONFIG_PROG_SWAP BIT(1)
#define RGMII_CONFIG_DDR_MODE BIT(0)
+#define RGMII_CONFIG_SGMII_CLK_DVDR GENMASK(18, 10)
/* SDCC_HC_REG_DLL_CONFIG fields */
#define SDCC_DLL_CONFIG_DLL_RST BIT(30)
@@ -78,6 +79,8 @@
#define ETHQOS_MAC_CTRL_SPEED_MODE BIT(14)
#define ETHQOS_MAC_CTRL_PORT_SEL BIT(15)
+#define SGMII_10M_RX_CLK_DVDR 0x31
+
struct ethqos_emac_por {
unsigned int offset;
unsigned int value;
@@ -598,6 +601,9 @@ static int ethqos_configure_rgmii(struct qcom_ethqos *ethqos)
return 0;
}
+/* On interface toggle MAC registers gets reset.
+ * Configure MAC block for SGMII on ethernet phy link up
+ */
static int ethqos_configure_sgmii(struct qcom_ethqos *ethqos)
{
int val;
@@ -617,6 +623,10 @@ static int ethqos_configure_sgmii(struct qcom_ethqos *ethqos)
case SPEED_10:
val |= ETHQOS_MAC_CTRL_PORT_SEL;
val &= ~ETHQOS_MAC_CTRL_SPEED_MODE;
+ rgmii_updatel(ethqos, RGMII_CONFIG_SGMII_CLK_DVDR,
+ FIELD_PREP(RGMII_CONFIG_SGMII_CLK_DVDR,
+ SGMII_10M_RX_CLK_DVDR),
+ RGMII_IO_MACRO_CONFIG);
break;
}
