diff options
Diffstat (limited to 'meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/1004-DTS_CPU-filter-first-zero-from-RdPkgConfig-10.patch')
| -rw-r--r-- | meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/1004-DTS_CPU-filter-first-zero-from-RdPkgConfig-10.patch | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/1004-DTS_CPU-filter-first-zero-from-RdPkgConfig-10.patch b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/1004-DTS_CPU-filter-first-zero-from-RdPkgConfig-10.patch new file mode 100644 index 000000000..aab6c3cea --- /dev/null +++ b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/1004-DTS_CPU-filter-first-zero-from-RdPkgConfig-10.patch @@ -0,0 +1,64 @@ +From 68db4c74c43d4042b0b32bcd133121ab39b9b310 Mon Sep 17 00:00:00 2001 +From: Zhikui Ren <zhikui.ren@intel.com> +Date: Tue, 2 Feb 2021 14:49:28 -0800 +Subject: [PATCH] DTS_CPU: filter first zero from RdPkgConfig 10 + +Peci command GetPkgConfig 10 can return 0 (hot) with cc 0x40 +after cpu reset. Once pcode run time image is loaded +and it returns 0x8000 as DTS margin data not ready +Discard the first zero reading and return -ENODATA. +Consecutive zeros will be returned so that real hot +condition will still be detected and logged but possibly delayed +by the sensor polling period, which is normally one second. + +Signed-off-by: Zhikui Ren <zhikui.ren@intel.com> +--- + drivers/hwmon/peci-cputemp.c | 18 ++++++++++++++++++ + 1 file changed, 18 insertions(+) + +diff --git a/drivers/hwmon/peci-cputemp.c b/drivers/hwmon/peci-cputemp.c +index 19002f02bd91..e1860779aa66 100644 +--- a/drivers/hwmon/peci-cputemp.c ++++ b/drivers/hwmon/peci-cputemp.c +@@ -17,6 +17,7 @@ struct temp_group { + struct peci_sensor_data die; + u32 die_raw_prev; + struct peci_sensor_data dts; ++ u32 dts_raw_prev; + struct peci_sensor_data tcontrol; + struct peci_sensor_data tthrottle; + struct peci_sensor_data tjmax; +@@ -168,6 +169,7 @@ static int get_dts(struct peci_cputemp *priv) + s32 dts_margin; + u8 pkg_cfg[4]; + int ret; ++ bool discard = false; + + if (!peci_sensor_need_update(&priv->temp.dts)) + return 0; +@@ -181,6 +183,22 @@ static int get_dts(struct peci_cputemp *priv) + + dts_margin = le16_to_cpup((__le16 *)pkg_cfg); + ++ /* There is a small window (500us) for read dts_margin (RdPkgConfig 10) ++ * to return cc 0x40, and dts_margin of 0 after cpu reset, before runtime ++ * image is loaded to set it to 0x8000 (dts reading not ready). ++ * DTS sensor is polled by user application at a slower rate than this window. ++ * Treat the first zero reading as data not available. ++ * Consecutive zeros will be returned so true hot condition ++ * is not be missed. ++ */ ++ if (dts_margin == 0 && priv->temp.dts_raw_prev != 0) { ++ pr_err("peci-cputemp_dts: discard first 0 reading from RdPkgConfig 10\n"); ++ discard = true; ++ } ++ priv->temp.dts_raw_prev = dts_margin; ++ if (discard) ++ return -ENODATA; ++ + /** + * Processors return a value of DTS reading in 10.6 format + * (10 bits signed decimal, 6 bits fractional). +-- +2.17.1 + |