diff options
| author | Ye Li <ye.li@nxp.com> | 2017-11-15 23:29:33 -0600 |
|---|---|---|
| committer | Ye Li <ye.li@nxp.com> | 2017-11-16 00:05:52 -0600 |
| commit | f340d0678d8f3576e769b87984ddddf71243a29b (patch) | |
| tree | 0430180ad86e4361b16809dcb1038fcf52c80b82 | |
| parent | c662e0a70cc1ec2d251ac7eac48a253710acf78b (diff) | |
MLK-16831 imx8m: Remove cpu-idle-states property from kernel FDT for rev A0
Since i.MX8M A0 has HW issue in CPU idle, we must disable the function
when running on A0 chip. This patch checks the CPU rev and remove the
"cpu-idle-states" from cpu nodes to disable the CPU idle.
Signed-off-by: Ye Li <ye.li@nxp.com>
Tested-by: Bai Ping <ping.bai@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
| -rw-r--r-- | arch/arm/cpu/armv8/imx8m/soc.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv8/imx8m/soc.c b/arch/arm/cpu/armv8/imx8m/soc.c index 1a1e908d00..8602c4a596 100644 --- a/arch/arm/cpu/armv8/imx8m/soc.c +++ b/arch/arm/cpu/armv8/imx8m/soc.c @@ -473,6 +473,37 @@ add_status: } } + /* Disable the CPU idle for A0 chip since the HW does not support it */ + if (is_soc_rev(CHIP_REV_1_0)) { + const char *nodes_path[] = { + "/cpus/cpu@0", + "/cpus/cpu@1", + "/cpus/cpu@2", + "/cpus/cpu@3", + }; + + int i = 0; + int rc; + int nodeoff; + + for (i = 0; i < ARRAY_SIZE(nodes_path); i++) { + nodeoff = fdt_path_offset(blob, nodes_path[i]); + if (nodeoff < 0) + continue; /* Not found, skip it */ + + printf("Found %s node\n", nodes_path[i]); + + rc = fdt_delprop(blob, nodeoff, "cpu-idle-states"); + if (rc) { + printf("Unable to update property %s:%s, err=%s\n", + nodes_path[i], "status", fdt_strerror(rc)); + } else { + printf("Remove %s:%s\n", + nodes_path[i], "cpu-idle-states"); + } + } + } + return ft_add_optee_node(blob, bd); } #endif |