From dcfd5192563909219f6304b4e3e10db071158eef Mon Sep 17 00:00:00 2001 From: Alyssa Rosenzweig Date: Tue, 15 Feb 2022 13:46:51 -0500 Subject: soc: mediatek: mtk-infracfg: Disable ACP on MT8192 MT8192 contains an experimental Accelerator Coherency Port implementation, which does not work correctly but was unintentionally enabled by default. For correct operation of the GPU, we must set a chicken bit disabling ACP on MT8192. Adapted from the following downstream change to the out-of-tree, legacy Mali GPU driver: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2781271/5 Note this change is required for both Panfrost and the legacy kernel driver. Co-developed-by: Robin Murphy Signed-off-by: Robin Murphy Signed-off-by: Alyssa Rosenzweig Cc: Nick Fan Cc: Nicolas Boichat Cc: Chen-Yu Tsai Cc: Stephen Boyd Cc: AngeloGioacchino Del Regno Tested-by: AngeloGioacchino Del Regno Link: https://lore.kernel.org/r/20220215184651.12168-1-alyssa.rosenzweig@collabora.com Signed-off-by: Matthias Brugger --- drivers/soc/mediatek/mtk-infracfg.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'drivers/soc') diff --git a/drivers/soc/mediatek/mtk-infracfg.c b/drivers/soc/mediatek/mtk-infracfg.c index 0590b68e0d78..2acf19676af2 100644 --- a/drivers/soc/mediatek/mtk-infracfg.c +++ b/drivers/soc/mediatek/mtk-infracfg.c @@ -6,6 +6,7 @@ #include #include #include +#include #include #include @@ -72,3 +73,21 @@ int mtk_infracfg_clear_bus_protection(struct regmap *infracfg, u32 mask, return ret; } + +static int __init mtk_infracfg_init(void) +{ + struct regmap *infracfg; + + /* + * MT8192 has an experimental path to route GPU traffic to the DSU's + * Accelerator Coherency Port, which is inadvertently enabled by + * default. It turns out not to work, so disable it to prevent spurious + * GPU faults. + */ + infracfg = syscon_regmap_lookup_by_compatible("mediatek,mt8192-infracfg"); + if (!IS_ERR(infracfg)) + regmap_set_bits(infracfg, MT8192_INFRA_CTRL, + MT8192_INFRA_CTRL_DISABLE_MFG2ACP); + return 0; +} +postcore_initcall(mtk_infracfg_init); -- cgit v1.2.3-73-gaa49b