| From b58874d5848b6758330aa4ffb27086659beba791 Mon Sep 17 00:00:00 2001 |
| From: Sasha Levin <sashal@kernel.org> |
| Date: Sun, 11 Jul 2021 23:40:23 +0200 |
| Subject: ARM: dts: meson8: Use a higher default GPU clock frequency |
| |
| From: Martin Blumenstingl <martin.blumenstingl@googlemail.com> |
| |
| [ Upstream commit 44cf630bcb8c5ec78125805c9447dd5766792224 ] |
| |
| We are seeing "imprecise external abort (0x1406)" errors during boot |
| (which then cause the whole board to hang) on Meson8 (but not Meson8m2). |
| These are observed while trying to access the GPU's registers when the |
| MALI clock is running at it's default setting of 24MHz. The 3.10 vendor |
| kernel uses 318.75MHz as "default" GPU frequency. Using that makes the |
| "imprecise external aborts" go away. |
| Add the assigned-clocks and assigned-clock-rates properties to also bump |
| the MALI clock to 318.75MHz before accessing any of it's registers. |
| |
| Fixes: 7d3f6b536e72c9 ("ARM: dts: meson8: add the Mali-450 MP6 GPU") |
| Reported-by: Demetris Ierokipides <ierokipides.dem@gmail.com> |
| Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> |
| Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> |
| Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> |
| Link: https://lore.kernel.org/r/20210711214023.2163565-1-martin.blumenstingl@googlemail.com |
| Signed-off-by: Sasha Levin <sashal@kernel.org> |
| --- |
| arch/arm/boot/dts/meson8.dtsi | 5 +++++ |
| 1 file changed, 5 insertions(+) |
| |
| diff --git a/arch/arm/boot/dts/meson8.dtsi b/arch/arm/boot/dts/meson8.dtsi |
| index 04688e8abce2..740a6c816266 100644 |
| --- a/arch/arm/boot/dts/meson8.dtsi |
| +++ b/arch/arm/boot/dts/meson8.dtsi |
| @@ -251,8 +251,13 @@ |
| "pp2", "ppmmu2", "pp4", "ppmmu4", |
| "pp5", "ppmmu5", "pp6", "ppmmu6"; |
| resets = <&reset RESET_MALI>; |
| + |
| clocks = <&clkc CLKID_CLK81>, <&clkc CLKID_MALI>; |
| clock-names = "bus", "core"; |
| + |
| + assigned-clocks = <&clkc CLKID_MALI>; |
| + assigned-clock-rates = <318750000>; |
| + |
| operating-points-v2 = <&gpu_opp_table>; |
| }; |
| }; |
| -- |
| 2.30.2 |
| |
