This is one of the steps to enable DVFS with the Panfrost driver:
since Panfrost is already enabling the (required) MFG power domains
and since the mtk-pm-domains driver is already responsible for
actually enabling the SRAM PDN, it makes sense to make sure that
the VSRAM supply is ON when trying to reset/enable the SRAM.
For this reason, the MTK_SCPD_DOMAIN_SUPPLY flag was added to one
more MFG domain, ensuring that the SRAM is actually powered and
also not relying on the bootloader leaving this supply on; on the
other hand, this is also making possible to avoid setting a
sram-supply on the GPU node, making devfreq happy about having
only one supply and finally allowing DVFS to happen.
If no domain-supply is declared in devicetree, mtk-pm-domains driver
probe will anyway keep going, so this is not breaking old devicetrees.
No side effects either when this supply is declared for both a MFG
domain and Panfrost together.
This series has no dependencies.
AngeloGioacchino Del Regno (5):
soc: mediatek: mt8192-pm-domains: Allow probing vreg supply on MFG0/1
soc: mediatek: mt8183-pm-domains: Allow probing vreg supply on
MFG_ASYNC
soc: mediatek: mt8195-pm-domains: Allow probing vreg supply on MFG1
soc: mediatek: mt8186-pm-domains: Allow probing vreg supply on MFG1
arm64: dts: mediatek: mt8183-kukui: Assign sram supply to mfg_async pd
arch/arm64/boot/dts/mediatek/mt8183-kukui.dtsi | 4 ++++
arch/arm64/boot/dts/mediatek/mt8183.dtsi | 2 +-
drivers/soc/mediatek/mt8183-pm-domains.h | 1 +
drivers/soc/mediatek/mt8186-pm-domains.h | 2 +-
drivers/soc/mediatek/mt8192-pm-domains.h | 2 ++
drivers/soc/mediatek/mt8195-pm-domains.h | 2 +-
6 files changed, 10 insertions(+), 3 deletions(-)
--
2.35.1
