On 22/02/2023 23:47, Konrad Dybcio wrote:
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
These should go into a2xx.xml.h
LGTM otherwise.
+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,
--
With best wishes
Dmitry
