diff options
Diffstat (limited to 'kernel/drivers/net/ieee802154/dw3000_stm.c')
| -rw-r--r-- | kernel/drivers/net/ieee802154/dw3000_stm.c | 50 |
1 files changed, 44 insertions, 6 deletions
diff --git a/kernel/drivers/net/ieee802154/dw3000_stm.c b/kernel/drivers/net/ieee802154/dw3000_stm.c index 40da614..5b85643 100644 --- a/kernel/drivers/net/ieee802154/dw3000_stm.c +++ b/kernel/drivers/net/ieee802154/dw3000_stm.c @@ -21,21 +21,50 @@ * Qorvo. Please contact Qorvo to inquire about licensing terms. */ #include <linux/version.h> +#include <linux/module.h> #include <linux/workqueue.h> #include <linux/sched.h> #include <linux/mutex.h> +#include <linux/of.h> #include "dw3000.h" #include "dw3000_core.h" -#define DW3000_MIN_CLAMP_VALUE 170 +#define DW3000_MIN_CLAMP_VALUE 460 /* First version with sched_setattr_nocheck: v4.16-rc1~164^2~5 */ #if (KERNEL_VERSION(4, 11, 0) <= LINUX_VERSION_CODE) #include <uapi/linux/sched/types.h> #endif -static inline int dw3000_set_sched_attr(struct task_struct *p) +static int dw3000_min_clamp_value = 0; + +module_param_named(min_clamp_value, dw3000_min_clamp_value, int, 0644); +MODULE_PARM_DESC(min_clamp_value, "Sets the minimum cpu frequency the dw3000 thread must run at"); + + +static void dw3000_get_clamp_from_dt(struct dw3000 *dw) { + int dt_clamp = DW3000_MIN_CLAMP_VALUE; + int ret; + + if (!dw->dev->of_node) + return; + /* debug value is priority */ + if (dw3000_min_clamp_value) { + dw->min_clamp_value = dw3000_min_clamp_value; + dev_info(dw->dev, "using debug min clamp=%d\n", dw->min_clamp_value); + return; + } + + ret = of_property_read_u32(dw->dev->of_node, "min_clamp", &dt_clamp); + if (ret) { + dev_err(dw->dev, "error reading dt_clamp ret=%d\n", ret); + } + dw->min_clamp_value = dt_clamp; + dev_info(dw->dev, "dt_clamp=%d\n", dw->min_clamp_value); +} + +static inline int dw3000_set_sched_attr(struct dw3000 *dw, struct task_struct *p) { #if (KERNEL_VERSION(5, 9, 0) > LINUX_VERSION_CODE) struct sched_param sched_par = { .sched_priority = MAX_RT_PRIO - 2 }; @@ -45,7 +74,7 @@ static inline int dw3000_set_sched_attr(struct task_struct *p) struct sched_attr attr = { .sched_policy = SCHED_FIFO, .sched_priority = MAX_RT_PRIO - 2, .sched_flags = SCHED_FLAG_UTIL_CLAMP_MIN, - .sched_util_min = DW3000_MIN_CLAMP_VALUE }; + .sched_util_min = dw->min_clamp_value }; return sched_setattr_nocheck(p, &attr); #endif } @@ -75,7 +104,7 @@ int dw3000_enqueue_generic(struct dw3000 *dw, struct dw3000_stm_command *cmd) return cmd->cmd(dw, cmd->in, cmd->out); } - /* Mutex is used in dw3000_enqueue_generic() + /* Mutex is used in dw3000_enqueue_generic() * This protection will work with the spinlock in order to allow * the CPU to sleep and avoid ressources wasting during spinning */ @@ -302,14 +331,18 @@ int dw3000_state_init(struct dw3000 *dw, int cpu) stm->mthread = kthread_create(dw3000_event_thread, dw, "dw3000-%s", dev_name(dw->dev)); if (IS_ERR(stm->mthread)) { - return PTR_ERR(stm->mthread); + int err = PTR_ERR(stm->mthread); + stm->mthread = NULL; + return err; } + get_task_struct(stm->mthread); if (cpu >= 0) kthread_bind(stm->mthread, (unsigned)cpu); dw->dw3000_pid = stm->mthread->pid; /* Increase thread priority */ - rc = dw3000_set_sched_attr(stm->mthread); + dw3000_get_clamp_from_dt(dw); + rc = dw3000_set_sched_attr(dw, stm->mthread); if (rc) dev_err(dw->dev, "dw3000_set_sched_attr failed: %d\n", rc); return 0; @@ -360,8 +393,13 @@ int dw3000_state_stop(struct dw3000 *dw) { struct dw3000_state *stm = &dw->stm; + if (stm->mthread == NULL) + return 0; /* already stopped or not created yet */ + /* Stop state machine thread */ kthread_stop(stm->mthread); + put_task_struct(stm->mthread); + stm->mthread = NULL; dev_dbg(dw->dev, "state machine stopped\n"); return 0; |