Re: [PATCH RESEND v3 5/5] venus: pm_helpers: Use dev_pm_genpd_set_hwmode to switch GDSC mode

[Bryan O'Donoghue <bryan.odonoghue@linaro.org>]

On 01/11/2023 09:04, Abel Vesa wrote:
> From: Jagadeesh Kona <quic_jkona@quicinc.com>
> 
> This change demonstrates the use of dev_pm_genpd_set_hwmode API from
> video driver to switch the video mvs0 gdsc to SW/HW modes at runtime
> based on requirement.
> 
> This change adds a new boolean array member vcodec_pmdomains_hwctrl in
> venus_resources structure to indicate if GDSC's have HW control support
> or not. This data is used in vcodec_control_v4() to check if GDSC has
> support to switch to HW control mode and then call dev_pm_genpd_set_hwmode
> to switch the GDSC mode.
> 
> Before the GDSC HWCTL was available to the consumer, the venus driver
> needed to somehow keep the power from collapsing while under the driver
> control. The only way to do that was to clear the CORE_PWR_DISABLE bit
> (in wrapper POWER_CONTROL register) and, respectively, set it back after
> the driver control was completed.
> 
> Now, that there is a way to switch the GDSC HW/SW control back and
> forth, the CORE_PWR_DISABLE toggling can be dropped.
> 
> Signed-off-by: Jagadeesh Kona <quic_jkona@quicinc.com>
> Signed-off-by: Abel Vesa <abel.vesa@linaro.org>

So I plan to give this a test on rb5 and db410c

My q here though is - has anybody on the submission list tested this 
through suspend/resume and vdd min ?

---
bod