From a2c3c0a54d4cccb35e8071a11e203c4ac06f9e4e Mon Sep 17 00:00:00 2001 From: Sharat Masetty Date: Thu, 4 Oct 2018 15:11:43 +0530 Subject: drm/msm/a6xx: Add devfreq support for a6xx Implement routines to estimate GPU busy time and fetching the current frequency for the polling interval. This is required by the devfreq framework which recommends a frequency change if needed. The driver code then tries to set this new frequency on the GPU by sending an Out Of Band(OOB) request to the GMU. Signed-off-by: Sharat Masetty Signed-off-by: Rob Clark --- drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'drivers/gpu/drm/msm/adreno/a6xx_gpu.c') diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c index 5f36b8d88240..e4ac95f20ca7 100644 --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c @@ -7,6 +7,8 @@ #include "a6xx_gpu.h" #include "a6xx_gmu.xml.h" +#include + static inline bool _a6xx_check_idle(struct msm_gpu *gpu) { struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu); @@ -682,6 +684,8 @@ static int a6xx_pm_resume(struct msm_gpu *gpu) gpu->needs_hw_init = true; + msm_gpu_resume_devfreq(gpu); + return ret; } @@ -690,6 +694,8 @@ static int a6xx_pm_suspend(struct msm_gpu *gpu) struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu); struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu); + devfreq_suspend_device(gpu->devfreq.devfreq); + /* * Make sure the GMU is idle before continuing (because some transitions * may use VBIF @@ -753,6 +759,24 @@ static void a6xx_destroy(struct msm_gpu *gpu) kfree(a6xx_gpu); } +static unsigned long a6xx_gpu_busy(struct msm_gpu *gpu) +{ + struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu); + struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu); + u64 busy_cycles; + unsigned long busy_time; + + busy_cycles = gmu_read64(&a6xx_gpu->gmu, + REG_A6XX_GMU_CX_GMU_POWER_COUNTER_XOCLK_0_L, + REG_A6XX_GMU_CX_GMU_POWER_COUNTER_XOCLK_0_H); + + busy_time = ((busy_cycles - gpu->devfreq.busy_cycles) * 10) / 192; + + gpu->devfreq.busy_cycles = busy_cycles; + + return busy_time; +} + static const struct adreno_gpu_funcs funcs = { .base = { .get_param = adreno_get_param, @@ -768,6 +792,9 @@ static const struct adreno_gpu_funcs funcs = { #if defined(CONFIG_DEBUG_FS) || defined(CONFIG_DEV_COREDUMP) .show = a6xx_show, #endif + .gpu_busy = a6xx_gpu_busy, + .gpu_get_freq = a6xx_gmu_get_freq, + .gpu_set_freq = a6xx_gmu_set_freq, }, .get_timestamp = a6xx_get_timestamp, }; -- cgit v1.2.3