Hi Angelo,
Thanks for the review,
On 9/11/24 16:57, AngeloGioacchino Del Regno wrote:
[snip]
+/* for GPU SRAM */
+&mt6359_vsram_others_ldo_reg {
+ regulator-always-on;
No, that's not good. Like that, the GPU VSRAM will be subject to current
leakage.
Remove the regulator-always-on property.
The right way of doing that is to add the vgpu to the mfg0's domain
supply and
vsram to mfg1; that way all of the GPU regulators will be off at PM
suspend time.
Thanks for pointing this out, I'll send v2 to fix this.
&mt6359codec {
mediatek,mic-type-0 = <1>; /* ACC */
mediatek,mic-type-1 = <3>; /* DCC */
@@ -839,8 +851,8 @@ regulators {
mt6315_7_vbuck1: vbuck1 {
regulator-compatible = "vbuck1";
regulator-name = "Vgpu";
- regulator-min-microvolt = <300000>;
- regulator-max-microvolt = <1193750>;
+ regulator-min-microvolt = <546000>;
I'm okay with this constraint but are you sure that MTK-SVS won't go any
lower than 0.546V?
I'll see if I could confirm the maximum voltage drop that may be lowered
by mtk-svs for MT8395. There are 3 constraints that I am aware of:
- capability of Vgpu buck: 0.3V-1.193V
- sign-off voltage of the EVK board: 0.6V to 1.2V
- recommended operating voltage of MT8395 DVDD_GPU: 0.546V to 0.787V
For the device tree of the board, would you recommend set the regulator
voltage constraints in narrower range (because it's safer to keep in
recommended operating conditions), or in a wider range (leaving the
check to driver software for potential power saving?)
Thanks
