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soc: mediatek: mtk-infracfg: Disable ACP on MT8192

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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 <robin.murphy@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Cc: Nick Fan <Nick.Fan@mediatek.com>
Cc: Nicolas Boichat <drinkcat@chromium.org>
Cc: Chen-Yu Tsai <wenst@chromium.org>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220215184651.12168-1-alyssa.rosenzweig@collabora.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
This commit is contained in:
Alyssa Rosenzweig 2022-02-15 13:46:51 -05:00 committed by Matthias Brugger
parent 15f1768365
commit dcfd519256
2 changed files with 22 additions and 0 deletions
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19
drivers/soc/mediatek/mtk-infracfg.c
View file

@ -6,6 +6,7 @@
#include <linux/export.h>
#include <linux/jiffies.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include <linux/soc/mediatek/infracfg.h>
#include <asm/processor.h>
@ -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);

3
include/linux/soc/mediatek/infracfg.h
View file

@ -277,6 +277,9 @@
#define INFRA_TOPAXI_PROTECTEN_SET 0x0260
#define INFRA_TOPAXI_PROTECTEN_CLR 0x0264
#define MT8192_INFRA_CTRL 0x290
#define MT8192_INFRA_CTRL_DISABLE_MFG2ACP BIT(9)
#define REG_INFRA_MISC 0xf00
#define F_DDR_4GB_SUPPORT_EN BIT(13)