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

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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@xxxxxxxxxxx>
Signed-off-by: Abel Vesa <abel.vesa@xxxxxxxxxx>
---

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





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