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[5.10,12/57] arm64: dts: meson: Describe G12b GPU as coherent

Message ID 20210205140656.505146441@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH Feb. 5, 2021, 2:06 p.m. UTC
From: Robin Murphy <robin.murphy@arm.com>

commit 03544505cb10ddc73df3b6176e71cdb366834134 upstream.

According to a downstream commit I found in the Khadas vendor kernel,
the GPU on G12b is wired up for ACE-lite, so (now that Panfrost knows
how to handle this properly) we should describe it as such. Otherwise
the mismatch leads to all manner of fun with mismatched attributes and
inadvertently snooping stale data from caches, which would account for
at least some of the brokenness observed on this platform.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/765446e529e50b304af63432da7836c4d31eb8d4.1600780574.git.robin.murphy@arm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/arm64/boot/dts/amlogic/meson-g12b.dtsi |    4 ++++
 1 file changed, 4 insertions(+)
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Patch

--- a/arch/arm64/boot/dts/amlogic/meson-g12b.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-g12b.dtsi
@@ -135,3 +135,7 @@ 
 		};
 	};
 };
+
+&mali {
+	dma-coherent;
+};