linux-kernel - [PATCH v4 14/19] arm64: dts: mediatek: mt8195: Add mfg_core

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Message-Id: <20230301095523.428461-15-angelogioacchino.delregno@collabora.com>
Date:   Wed,  1 Mar 2023 10:55:18 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     matthias.bgg@...il.com
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        angelogioacchino.delregno@...labora.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, wenst@...omium.org
Subject: [PATCH v4 14/19] arm64: dts: mediatek: mt8195: Add mfg_core_tmp clock to MFG1 domain

Similarly to what can be seen in MT8192, on MT8195 the mfg_core_tmp
clock is a mux used to switch between different "safe" (and slower)
clock sources for the GPU: this is used during MFGPLL reconfiguration
and eventually during idling at very low frequencies.

This clock getting turned off means that the GPU will occasionally be
unclocked, producing obvious consequences such as system crash or
unpredictable behavior: assigning it to the top level MFG power domain
will make sure that this stays on at all times during any operation on
the MFG domain (only GPU-related transactions).

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Reviewed-by: Chen-Yu Tsai <wenst@...omium.org>
---
 arch/arm64/boot/dts/mediatek/mt8195.dtsi | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/mediatek/mt8195.dtsi b/arch/arm64/boot/dts/mediatek/mt8195.dtsi
index 8f1264d5290b..d116830d6af3 100644
--- a/arch/arm64/boot/dts/mediatek/mt8195.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8195.dtsi
@@ -446,8 +446,9 @@ mfg0: power-domain@...195_POWER_DOMAIN_MFG0 {
 
 					power-domain@...195_POWER_DOMAIN_MFG1 {
 						reg = <MT8195_POWER_DOMAIN_MFG1>;
-						clocks = <&apmixedsys CLK_APMIXED_MFGPLL>;
-						clock-names = "mfg";
+						clocks = <&apmixedsys CLK_APMIXED_MFGPLL>,
+							 <&topckgen CLK_TOP_MFG_CORE_TMP>;
+						clock-names = "mfg", "alt";
 						mediatek,infracfg = <&infracfg_ao>;
 						#address-cells = <1>;
 						#size-cells = <0>;
-- 
2.39.2