diff options
Diffstat (limited to 'arch/arm/mach-ux500/pm/performance.c')
| -rw-r--r-- | arch/arm/mach-ux500/pm/performance.c | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/arch/arm/mach-ux500/pm/performance.c b/arch/arm/mach-ux500/pm/performance.c index 4f9fe381fd9..e919e01614c 100644 --- a/arch/arm/mach-ux500/pm/performance.c +++ b/arch/arm/mach-ux500/pm/performance.c @@ -16,6 +16,7 @@ #include <linux/kernel.h> #include <linux/mfd/dbx500-prcmu.h> #include <linux/cpu.h> +#include <linux/pm_qos_params.h> #include <mach/irqs.h> @@ -47,6 +48,8 @@ static struct delayed_work work_mmc; static struct delayed_work work_wlan_workaround; +static struct pm_qos_request_list wlan_pm_qos_latency; +static bool wlan_pm_qos_is_latency_0; static void wlan_load(struct work_struct *work) { @@ -58,12 +61,31 @@ static void wlan_load(struct work_struct *work) num_irqs += kstat_irqs_cpu(IRQ_DB8500_SDMMC1, cpu); if ((num_irqs > old_num_irqs) && - (num_irqs - old_num_irqs) > WLAN_LIMIT) + (num_irqs - old_num_irqs) > WLAN_LIMIT) { prcmu_qos_update_requirement(PRCMU_QOS_ARM_OPP, "wlan", 125); - else + if (!wlan_pm_qos_is_latency_0) { + /* + * The wake up latency is set to 0 to prevent + * the system from going to sleep. This improves + * the wlan throughput in DMA mode. + * The wake up latency from sleep adds ~5% overhead + * for TX in some cases. + * This change doesn't increase performance for wlan + * PIO since the CPU usage prevents sleep in this mode. + */ + pm_qos_add_request(&wlan_pm_qos_latency, + PM_QOS_CPU_DMA_LATENCY, 0); + wlan_pm_qos_is_latency_0 = true; + } + } else { prcmu_qos_update_requirement(PRCMU_QOS_ARM_OPP, "wlan", 25); + if (wlan_pm_qos_is_latency_0) { + pm_qos_remove_request(&wlan_pm_qos_latency); + wlan_pm_qos_is_latency_0 = false; + } + } old_num_irqs = num_irqs; |