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 <smasetty@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index 5f36b8d..e4ac95f 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 <linux/devfreq.h>
+
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,
};
