By hardware, the first and second core of the video decoder IP
need the VDEC_SOC to be powered up in order to be able to be
accessed (both internally, by firmware, and externally, by the
kernel).
Similarly, for the video encoder IP, the second core needs the
first core to be powered up in order to be accessible.

Fix that by reparenting the VDEC1/2 power domains to be children
of VDEC0 (VDEC_SOC), and the VENC1 to be a child of VENC0.

Fixes: 2b515194bf0c ("arm64: dts: mt8195: Add power domains controller")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
---
 arch/arm64/boot/dts/mediatek/mt8195.dtsi | 50 +++++++++++++-----------
 1 file changed, 27 insertions(+), 23 deletions(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt8195.dtsi b/arch/arm64/boot/dts/mediatek/mt8195.dtsi
index 0cb96cba727a..aeca7eeb4067 100644
--- a/arch/arm64/boot/dts/mediatek/mt8195.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8195.dtsi
@@ -619,22 +619,6 @@ power-domain@MT8195_POWER_DOMAIN_VPPSYS0 {
 					#size-cells = <0>;
 					#power-domain-cells = <1>;
 
-					power-domain@MT8195_POWER_DOMAIN_VDEC1 {
-						reg = <MT8195_POWER_DOMAIN_VDEC1>;
-						clocks = <&vdecsys CLK_VDEC_LARB1>;
-						clock-names = "vdec1-0";
-						mediatek,infracfg = <&infracfg_ao>;
-						#power-domain-cells = <0>;
-					};
-
-					power-domain@MT8195_POWER_DOMAIN_VENC_CORE1 {
-						reg = <MT8195_POWER_DOMAIN_VENC_CORE1>;
-						clocks = <&vencsys_core1 CLK_VENC_CORE1_LARB>;
-						clock-names = "venc1-larb";
-						mediatek,infracfg = <&infracfg_ao>;
-						#power-domain-cells = <0>;
-					};
-
 					power-domain@MT8195_POWER_DOMAIN_VDOSYS0 {
 						reg = <MT8195_POWER_DOMAIN_VDOSYS0>;
 						clocks = <&topckgen CLK_TOP_CFG_VDO0>,
@@ -680,15 +664,25 @@ power-domain@MT8195_POWER_DOMAIN_VDEC0 {
 							clocks = <&vdecsys_soc CLK_VDEC_SOC_LARB1>;
 							clock-names = "vdec0-0";
 							mediatek,infracfg = <&infracfg_ao>;
+							#address-cells = <1>;
+							#size-cells = <0>;
 							#power-domain-cells = <0>;
-						};
 
-						power-domain@MT8195_POWER_DOMAIN_VDEC2 {
-							reg = <MT8195_POWER_DOMAIN_VDEC2>;
-							clocks = <&vdecsys_core1 CLK_VDEC_CORE1_LARB1>;
-							clock-names = "vdec2-0";
-							mediatek,infracfg = <&infracfg_ao>;
-							#power-domain-cells = <0>;
+							power-domain@MT8195_POWER_DOMAIN_VDEC1 {
+								reg = <MT8195_POWER_DOMAIN_VDEC1>;
+								clocks = <&vdecsys CLK_VDEC_LARB1>;
+								clock-names = "vdec1-0";
+								mediatek,infracfg = <&infracfg_ao>;
+								#power-domain-cells = <0>;
+							};
+
+							power-domain@MT8195_POWER_DOMAIN_VDEC2 {
+								reg = <MT8195_POWER_DOMAIN_VDEC2>;
+								clocks = <&vdecsys_core1 CLK_VDEC_CORE1_LARB1>;
+								clock-names = "vdec2-0";
+								mediatek,infracfg = <&infracfg_ao>;
+								#power-domain-cells = <0>;
+							};
 						};
 
 						power-domain@MT8195_POWER_DOMAIN_VENC {
@@ -696,7 +690,17 @@ power-domain@MT8195_POWER_DOMAIN_VENC {
 							clocks = <&vencsys CLK_VENC_LARB>;
 							clock-names = "venc0-larb";
 							mediatek,infracfg = <&infracfg_ao>;
+							#address-cells = <1>;
+							#size-cells = <0>;
 							#power-domain-cells = <0>;
+
+							power-domain@MT8195_POWER_DOMAIN_VENC_CORE1 {
+								reg = <MT8195_POWER_DOMAIN_VENC_CORE1>;
+								clocks = <&vencsys_core1 CLK_VENC_CORE1_LARB>;
+								clock-names = "venc1-larb";
+								mediatek,infracfg = <&infracfg_ao>;
+								#power-domain-cells = <0>;
+							};
 						};
 
 						power-domain@MT8195_POWER_DOMAIN_VDOSYS1 {
-- 
2.48.1

On Wed, Apr 2, 2025 at 5:11 PM AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com> wrote:
>
> By hardware, the first and second core of the video decoder IP
> need the VDEC_SOC to be powered up in order to be able to be
> accessed (both internally, by firmware, and externally, by the
> kernel).
> Similarly, for the video encoder IP, the second core needs the
> first core to be powered up in order to be accessible.
>
> Fix that by reparenting the VDEC1/2 power domains to be children
> of VDEC0 (VDEC_SOC), and the VENC1 to be a child of VENC0.
>
> Fixes: 2b515194bf0c ("arm64: dts: mt8195: Add power domains controller")
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Changes look correct. Would need MediaTek to confirm whether the power
domain hierarchy matches what is claimed here.

Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>