Implement gpu_busy based on the downstream msm-3.4 code [1]. This allows us to use devfreq on this old old old hardware! [1] https://github.com/LineageOS/android_kernel_sony_apq8064/blob/lineage-16.0/drivers/gpu/msm/adreno_a2xx.c#L1975 Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx> --- drivers/gpu/drm/msm/adreno/a2xx_gpu.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/drivers/gpu/drm/msm/adreno/a2xx_gpu.c b/drivers/gpu/drm/msm/adreno/a2xx_gpu.c index c67089a7ebc1..6258c98e5a88 100644 --- a/drivers/gpu/drm/msm/adreno/a2xx_gpu.c +++ b/drivers/gpu/drm/msm/adreno/a2xx_gpu.c @@ -481,6 +481,33 @@ a2xx_create_address_space(struct msm_gpu *gpu, struct platform_device *pdev) return aspace; } +/* While the precise size of this field is unknown, it holds at least these three values.. */ +#define PERF_MODE_CNT GENMASK(2, 0) + #define PERF_STATE_RESET 0x0 + #define PERF_STATE_ENABLE 0x1 + #define PERF_STATE_FREEZE 0x2 +static u64 a2xx_gpu_busy(struct msm_gpu *gpu, unsigned long *out_sample_rate) +{ + u64 busy_cycles; + + /* Freeze the counter */ + gpu_write(gpu, REG_A2XX_CP_PERFMON_CNTL, FIELD_PREP(PERF_MODE_CNT, PERF_STATE_FREEZE)); + + busy_cycles = gpu_read64(gpu, REG_A2XX_RBBM_PERFCOUNTER1_LO); + + /* Reset the counter */ + gpu_write(gpu, REG_A2XX_CP_PERFMON_CNTL, FIELD_PREP(PERF_MODE_CNT, PERF_STATE_RESET)); + + /* Re-enable the performance monitors */ + gpu_rmw(gpu, REG_A2XX_RBBM_PM_OVERRIDE2, BIT(6), BIT(6)); + gpu_write(gpu, REG_A2XX_RBBM_PERFCOUNTER1_SELECT, 1); + gpu_write(gpu, REG_A2XX_CP_PERFMON_CNTL, FIELD_PREP(PERF_MODE_CNT, PERF_STATE_ENABLE)); + + *out_sample_rate = clk_get_rate(gpu->core_clk); + + return busy_cycles; +} + static u32 a2xx_get_rptr(struct msm_gpu *gpu, struct msm_ringbuffer *ring) { ring->memptrs->rptr = gpu_read(gpu, REG_AXXX_CP_RB_RPTR); @@ -502,6 +529,7 @@ static const struct adreno_gpu_funcs funcs = { #if defined(CONFIG_DEBUG_FS) || defined(CONFIG_DEV_COREDUMP) .show = adreno_show, #endif + .gpu_busy = a2xx_gpu_busy, .gpu_state_get = a2xx_gpu_state_get, .gpu_state_put = adreno_gpu_state_put, .create_address_space = a2xx_create_address_space, -- 2.39.2
