Missing patch in kernel sources spi-tegra114.c - JP7.2

[sevm89]

Dear Nvidia Team

For JetPack 7.1, in order to make a MCP2518FD Chip work with the spi-tegra114.ko module, we had to apply the patch here:

Jetson orin nano SPI Speed not changing

Is the CS pin working not as expected? If not, please apply the following patch to check if it could help in your case. diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c --- a/drivers/spi/spi-tegra114.c +++ b/drivers/spi/spi-tegra114.c @@ -870,6 +870,8 @@ static u32 tegra_spi_setup_transfer_one(struct spi_device *spi, else command1 &= ~SPI_CS_SW_VAL; } + tspi->use_hw_based_cs = true; + command1 &= ~(SPI_CS_SW_HW | SPI_CS_SW_VAL); if (!tspi->prod_list) { …

Please see the old case we opened for JetPack 7.1:

MCP2518FD - CAN receive works, sending does not work

Hi sevm89, What’s the Jetpack version in use? Have you configured the pinmux for SPI before use? Do you verify SPI loopback test working before porting MCP2515FD? Please share the full dmesg and device tree for further check.

In the kernel sources “spi-tegra114.c” for JetPack 7.2, this patch is still missing. Is it not needed or is it still not applied?

Thank you for your support.

[KevinFFF]

Hi sevm89,

Sorry that the fixes were not integrated to JP7.2.

For both JP7.1 and JP7.2, you may need to apply the following 2 patches.
0001-NVIDIA-SAUCE-spi-tegra114-Force-SW-CS-for-multi-xfer.patch (3.7 KB)
0002-NVIDIA-SAUCE-spi-tegra114-Preserve-SW-CS-across-bus-.patch (5.0 KB)