arm64: dts: renesas: r9a09g047: Enable Tx coe support

The GBETH IPs found on RZ/G3E SoC family are compatible with the stmmac
driver.  They have a MAC HW feature register used by this driver to
enable respective features.  While the register advertises Tx coe
support, it was not enabled by the driver due to the
'snps,force_thresh_dma_mode' dtsi property.

Switch from 'snps,force_thresh_dma_mode' to 'snps,force_sf_dma_mode' to
enable Tx checksum offload support on both GBETH IPs.  While at it, also
switch from 'snps,fixed-burst' to 'snps,mixed-burst' and remove
'snps,no-pbl-x8' for optimal DMA configuration.  This improvement
results in a measurable TCP Tx performance gain, increasing throughput
by 20Mbps.

Signed-off-by: John Madieu <john.madieu.xa@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20250814153456.268208-1-john.madieu.xa@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

diff --git a/arch/arm64/boot/dts/renesas/r9a09g047.dtsi b/arch/arm64/boot/dts/renesas/r9a09g047.dtsi
index e5b24e46d6457592e3fad13fe1aa514b26ccf1ad..47d843c79021215cde564990d1421677af2ec50a 100644 (file)
--- a/arch/arm64/boot/dts/renesas/r9a09g047.dtsi
+++ b/arch/arm64/boot/dts/renesas/r9a09g047.dtsi
@@ -927,9 +927,8 @@
                        snps,perfect-filter-entries = <128>;
                        rx-fifo-depth = <8192>;
                        tx-fifo-depth = <8192>;
-                       snps,fixed-burst;
-                       snps,no-pbl-x8;
-                       snps,force_thresh_dma_mode;
+                       snps,mixed-burst;
+                       snps,force_sf_dma_mode;
                        snps,axi-config = <&stmmac_axi_setup>;
                        snps,mtl-rx-config = <&mtl_rx_setup0>;
                        snps,mtl-tx-config = <&mtl_tx_setup0>;
@@ -1028,9 +1027,8 @@
                        snps,perfect-filter-entries = <128>;
                        rx-fifo-depth = <8192>;
                        tx-fifo-depth = <8192>;
-                       snps,fixed-burst;
-                       snps,no-pbl-x8;
-                       snps,force_thresh_dma_mode;
+                       snps,mixed-burst;
+                       snps,force_sf_dma_mode;
                        snps,axi-config = <&stmmac_axi_setup>;
                        snps,mtl-rx-config = <&mtl_rx_setup1>;
                        snps,mtl-tx-config = <&mtl_tx_setup1>;