TX2 NX SPI not working

Autonomous Machines Jetson & Embedded Systems Jetson TX2
1

Hi:
I’m using JetPack 4.5.1 on TX2 NX, test with spidev_test, SPI0 is working, SPI1 is not.
I have not modified pinmux configuration : bootloader/t186ref/BCT/tegra186-mb1-bct-pinmux-p3636-0001-a00.cfg, because I think the 2 SPI are all configured correctly:

pinmux.0x0243d018 = 0x00000446; # gpio_wan5_ph0: spi1, pull-down, tristate-disable, input-enable, lpdr-disable
pinmux.0x0243d010 = 0x00000446; # gpio_wan6_ph1: spi1, pull-down, tristate-disable, input-enable, lpdr-disable
pinmux.0x0243d008 = 0x00000446; # gpio_wan7_ph2: spi1, pull-down, tristate-disable, input-enable, lpdr-disable
pinmux.0x0243d000 = 0x0000044a; # gpio_wan8_ph3: spi1, pull-up, tristate-disable, input-enable, lpdr-disable
pinmux.0x0c302050 = 0x00000444; # gpio_sen1_pv1: spi2, pull-down, tristate-disable, input-enable, lpdr-disable
pinmux.0x0c302058 = 0x00000444; # gpio_sen2_pv2: spi2, pull-down, tristate-disable, input-enable, lpdr-disable
pinmux.0x0c302060 = 0x00000444; # gpio_sen3_pv3: spi2, pull-down, tristate-disable, input-enable, lpdr-disable
pinmux.0x0c302068 = 0x00000448; # gpio_sen4_pv4: spi2, pull-up, tristate-disable, input-enable, lpdr-disable

test output:

# ./spidev_test  -D /dev/spidev3.0
spi mode: 0x3
bits per word: 8
max speed: 500000 Hz (500 KHz)
RX | 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  | ................................
3

Hi,
Please using jetson-io to configure those pin to try again.

Thanks

4

Hi,
I did, nothing changed.

  =================== Jetson Expansion Header Tool ===================
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 |                Select desired functions (for pins):                |
 |                                                                    |
 |                  [ ] aud_mclk       (7)                            |
 |                  [ ] extperiph3_clk (29)                           |
 |                  [*] i2s1           (12,35,38,40)                  |
 |                  [ ] pwm1           (32)                           |
 |                  [ ] pwm3           (33)                           |
 |                  [*] spi1           (19,21,23,24)                  |
 |                  [*] spi2           (13,18,22,37)                  |
 |                  [ ] touch_clk      (31)                           |
 |                  [*] uartc-cts/rts  (11,36)                        |
 |                                                                    |
 |                                Back                                |
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  ====================================================================
5

Did you short pin 19/21 for loopback test?

6

19/21 is SPI0, it’s working.
22/37 is SPI1, it’s not.
Both are shorted.

7

I just check on J4.6.1(r32.7.1) without problem after enable by jetson-io.

nvidia@tegra-ubuntu:~$ sudo ./spidev_test -D /dev/spidev1.0 -g 32 -s 1100000000 -zzz
using device: /dev/spidev1.0
setting spi mode for read,write
setting spi bpw
setting max speed for rd/wr
spi mode: 0
bits per word: 8 bytes per word: 1
max speed: 1100000000 Hz (1100000 KHz)
no. runs: 1
Using seed:0x62440751
loop count = 0
using sequential pattern ....
transfer bytes [32]
0000: 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
0010: 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F
transfer: Return actual transfer length: 32
receive bytes [32]
0000: 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
0010: 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F
transfer: received packet size:32 len:32 stat:0
/dev/spidev1.0: TEST PASSED
====== Transfer stats ====
Transmit:
       total: 32B (0KiB 0MiB)
       total: 1P
       ioerr: 0B (0KiB 0MiB)
       ioerr: 0P
 Rate:
  wire total: -1B/s (0KB/s)
       total: -1B/s (0KB/s)
  wire total: -1P/s
       total: -1P/s
Receive:
       total: 32B (0KiB 0MiB)
       total: 1P
        good: 32B (0KiB 0MiB)
        good: 1P
       ioerr: 0P
     dataerr: 0P
 Rate:
        good: -1B/s (0KB/s)
        good: -1P/s
 packet drop: -1/10000

  Total time: 0.000861s
8

Hi, /dev/spidev1.0 is SPI0, can you test /dev/spidev3.0 or /dev/spidev3.1 ?

9

For Jetson TX2 NX only have spi1/spi2 aka spidev0.x/spidev1.0

              [*] spi1           (19,21,23,24)                  |
              [*] spi2           (13,18,22,37)
10

I’m working on Jetpack 4.5.1, it’s a bug, here is the patch:

diff --git a/kernel-dts/common/tegra186-p3636-0001-common.dtsi b/kernel-dts/common/tegra186-p3636-0001-common.dtsi
index a0e922b..d5f3a88 100644
--- a/kernel-dts/common/tegra186-p3636-0001-common.dtsi
+++ b/kernel-dts/common/tegra186-p3636-0001-common.dtsi
-       spi@3240000 {
                status = "okay";
                spi@0 {
                        compatible = "spidev";
                        reg = <0x0>;
@@ -126,7 +124,243 @@
                };
        };
 
+       spi@c260000 {
                 status = "okay";
                 spi@0 {
                         compatible = "spidev";
11

So after apply the patch now doesn’t have problem for this topic?

12

Yes. the bug is also fixed in Jetpack 4.6.1

14

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