| Message ID | 20231220-sa8295p-gpu-v2-2-4763246b72c0@quicinc.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | arm64: dts: qcom: sa8295p: Enable GPU | expand |
On 22.12.2023 05:39, Bjorn Andersson wrote: > The GX GDSC is modelled to aid the GMU in powering down the GPU in the > event that the GPU crashes, so that it can be restarted again. But in > the event that the power-domain is supplied through a dedicated > regulator (in contrast to being a subdomin of another power-domain), > something needs to turn that regulator on, both to make sure things are > powered and to match the operation in gdsc_disable(). > > Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com> > --- Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org> Konrad
diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c index 5358e28122ab..e7a4068b9f39 100644 --- a/drivers/clk/qcom/gdsc.c +++ b/drivers/clk/qcom/gdsc.c @@ -557,7 +557,15 @@ void gdsc_unregister(struct gdsc_desc *desc) */ int gdsc_gx_do_nothing_enable(struct generic_pm_domain *domain) { - /* Do nothing but give genpd the impression that we were successful */ - return 0; + struct gdsc *sc = domain_to_gdsc(domain); + int ret = 0; + + /* Enable the parent supply, when controlled through the regulator framework. */ + if (sc->rsupply) + ret = regulator_enable(sc->rsupply); + + /* Do nothing with the GDSC itself */ + + return ret; } EXPORT_SYMBOL_GPL(gdsc_gx_do_nothing_enable);
The GX GDSC is modelled to aid the GMU in powering down the GPU in the event that the GPU crashes, so that it can be restarted again. But in the event that the power-domain is supplied through a dedicated regulator (in contrast to being a subdomin of another power-domain), something needs to turn that regulator on, both to make sure things are powered and to match the operation in gdsc_disable(). Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com> --- drivers/clk/qcom/gdsc.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)