| Message ID | 20230126151618.225127-7-konrad.dybcio@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [01/14] drm/msm/a6xx: De-staticize sptprac en/disable functions | expand |
On 26.01.2023 16:16, Konrad Dybcio wrote: > Currently we only utilize the OPP table connected to the GPU for > getting (available) frequencies. We do however need to scale the > voltage rail(s) accordingly to ensure that we aren't trying to > run the GPU at 1GHz with a VDD_LOW vote, as that would result in > an otherwise inexplainable hang. > > Tell the OPP framework that we want to scale the "core" clock > and swap out the clk_set_rate to a dev_pm_opp_set_rate in > msm_devfreq_target() to enable usage of required-opps and by > extension proper voltage level/corner scaling. > > Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org> > --- Welp, as-is, this breaks devfreq on GPUs with a GMU.. Will fix.. Konrad > drivers/gpu/drm/msm/adreno/adreno_gpu.c | 3 +++ > drivers/gpu/drm/msm/msm_gpu_devfreq.c | 2 +- > 2 files changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c > index 817599766329..c85ae3845a4e 100644 > --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c > +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c > @@ -1047,6 +1047,9 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev, > const char *gpu_name; > u32 speedbin; > > + /* This can only be done here, or devm_pm_opp_set_supported_hw will WARN_ON() */ > + devm_pm_opp_set_clkname(dev, "core"); > + > adreno_gpu->funcs = funcs; > adreno_gpu->info = adreno_info(config->rev); > adreno_gpu->gmem = adreno_gpu->info->gmem; > diff --git a/drivers/gpu/drm/msm/msm_gpu_devfreq.c b/drivers/gpu/drm/msm/msm_gpu_devfreq.c > index e27dbf12b5e8..ea70c1c32d94 100644 > --- a/drivers/gpu/drm/msm/msm_gpu_devfreq.c > +++ b/drivers/gpu/drm/msm/msm_gpu_devfreq.c > @@ -48,7 +48,7 @@ static int msm_devfreq_target(struct device *dev, unsigned long *freq, > gpu->funcs->gpu_set_freq(gpu, opp, df->suspended); > mutex_unlock(&df->lock); > } else { > - clk_set_rate(gpu->core_clk, *freq); > + dev_pm_opp_set_rate(dev, *freq); > } > > dev_pm_opp_put(opp);
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c index 817599766329..c85ae3845a4e 100644 --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c @@ -1047,6 +1047,9 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev, const char *gpu_name; u32 speedbin; + /* This can only be done here, or devm_pm_opp_set_supported_hw will WARN_ON() */ + devm_pm_opp_set_clkname(dev, "core"); + adreno_gpu->funcs = funcs; adreno_gpu->info = adreno_info(config->rev); adreno_gpu->gmem = adreno_gpu->info->gmem; diff --git a/drivers/gpu/drm/msm/msm_gpu_devfreq.c b/drivers/gpu/drm/msm/msm_gpu_devfreq.c index e27dbf12b5e8..ea70c1c32d94 100644 --- a/drivers/gpu/drm/msm/msm_gpu_devfreq.c +++ b/drivers/gpu/drm/msm/msm_gpu_devfreq.c @@ -48,7 +48,7 @@ static int msm_devfreq_target(struct device *dev, unsigned long *freq, gpu->funcs->gpu_set_freq(gpu, opp, df->suspended); mutex_unlock(&df->lock); } else { - clk_set_rate(gpu->core_clk, *freq); + dev_pm_opp_set_rate(dev, *freq); } dev_pm_opp_put(opp);
Currently we only utilize the OPP table connected to the GPU for getting (available) frequencies. We do however need to scale the voltage rail(s) accordingly to ensure that we aren't trying to run the GPU at 1GHz with a VDD_LOW vote, as that would result in an otherwise inexplainable hang. Tell the OPP framework that we want to scale the "core" clock and swap out the clk_set_rate to a dev_pm_opp_set_rate in msm_devfreq_target() to enable usage of required-opps and by extension proper voltage level/corner scaling. Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org> --- drivers/gpu/drm/msm/adreno/adreno_gpu.c | 3 +++ drivers/gpu/drm/msm/msm_gpu_devfreq.c | 2 +- 2 files changed, 4 insertions(+), 1 deletion(-)