Re: [PATCH V5 RESEND 5/5] venus: pm_helpers: Use dev_pm_genpd_set_hwmode to switch GDSC mode on V6

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

On 13/04/2024 16:20, Jagadeesh Kona wrote:
> The Venus driver requires vcodec GDSC to be ON in SW mode for clock
> operations and move it back to HW mode to gain power benefits. Earlier,
> as there is no interface to switch the GDSC mode from GenPD framework,
> the GDSC is moved to HW control mode as part of GDSC enable callback and
> venus driver is writing to its POWER_CONTROL register to keep the GDSC ON
> from SW whereever required. But the POWER_CONTROL register addresses
> are not constant and can vary across the variants.
> 
> Also as per the HW recommendation, the GDSC mode switching needs to be
> controlled from respective GDSC register and this is a uniform approach
> across all the targets. Hence use dev_pm_genpd_set_hwmode() API which
> controls GDSC mode switching using its respective GDSC register.
> 
> In venus V6 variants, the vcodec gdsc gets enabled in SW mode by default
> with new HW_CTRL_TRIGGER flag and there is no need to switch it to SW
> mode again after enable, hence add check to avoid switching gdsc to SW mode
> again after gdsc enable. Similarly add check to avoid switching GDSC to HW
> mode before disabling the GDSC, so GDSC gets enabled in SW mode in the next
> enable.
> 
> Signed-off-by: Jagadeesh Kona <quic_jkona@quicinc.com>
> Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
> ---

When I tested this out on sm8250 a few months ago it was broken.

I don't quite see in your commit logs, how the breakage was addressed.

Can you provide some details ?

---
bod