Hi Greg,

On 2020-09-22 15:16, Robin Murphy wrote:

Hi all,

Here's a quick v2 with the tags so far picked up and some inline commentary about the shareability domains for the pagetable code.

Robin.

Robin Murphy (3): iommu/io-pgtable-arm: Support coherency for Mali LPAE drm/panfrost: Support cache-coherent integrations arm64: dts: meson: Describe G12b GPU as coherent

Please would you consider applying these patches to 5.10 stable? The mainline commit IDs are now:

728da60da7c1 iommu/io-pgtable-arm: Support coherency for Mali LPAE 268af50f38b1 drm/panfrost: Support cache-coherent integrations 03544505cb10 arm64: dts: meson: Describe G12b GPU as coherent

and I've checked that they cherry-pick to the current 5.10.y branch (5.10.12) cleanly.

Amlogic-based boards that require this support are quite popular, and end-users are now starting to run into the weird behaviour that ensues without it, which is all to easy to misattribute to the userspace driver in Mesa, e.g. [1],[2]. Fortunately 5.10 also happens to be the first kernel version to start probing the particular GPU models on these SoCs anyway, and I'm not aware of any other significant systems that are affected, so I don't believe we will need to worry about any other stable versions.

Thanks, Robin.

[1] https://gitlab.freedesktop.org/mesa/mesa/-/issues/4157 [2] https://gitlab.freedesktop.org/mesa/mesa/-/issues/4160

arch/arm64/boot/dts/amlogic/meson-g12b.dtsi | 4 ++++ drivers/gpu/drm/panfrost/panfrost_device.h | 1 + drivers/gpu/drm/panfrost/panfrost_drv.c | 2 ++ drivers/gpu/drm/panfrost/panfrost_gem.c | 2 ++ drivers/gpu/drm/panfrost/panfrost_mmu.c | 1 + drivers/iommu/io-pgtable-arm.c | 11 ++++++++++- 6 files changed, 20 insertions(+), 1 deletion(-)