[PATCH v4 0/2] Add SMI reset and clamp for MediaTek MT8188 SoC
Friday Yang
friday.yang at mediatek.com
Thu Feb 20 23:48:30 PST 2025
Based on tag: next-20250220, linux-next/master
On the MediaTek MT8188 SoC platform, we encountered power-off failures
and SMI bus hang issues during camera stress tests. The issue arises
because bus glitches are sometimes produced when MTCMOS powers on or
off. While this is fairly normal, the software must handle these
glitches to avoid mistaking them for transaction signals. What's
more, this issue emerged only after the initial upstreaming of SMI
driver.
The software solutions can be summarized as follows:
1. Use CLAMP to disable the SMI sub-common port after turning off the
LARB CG and before turning off the LARB MTCMOS.
2. Use CLAMP to disable/enable the SMI sub-common port.
3. Implement an AXI reset for SMI LARBs.
Changes v4:
- Use 'devm_reset_control_get_optional_exclusive' instead of
'devm_reset_control_get'.
v3:
https://lore.kernel.org/lkml/20250121064934.13482-2-
friday.yang at mediatek.com/
https://lore.kernel.org/lkml/20250121064934.13482-3-
friday.yang at mediatek.com/
friday.yang (2):
dt-bindings: memory: mediatek: Add SMI reset and clamp for MT8188
memory: mtk-smi: mt8188: Add SMI reset and clamp for MT8188
.../mediatek,smi-common.yaml | 2 +
.../memory-controllers/mediatek,smi-larb.yaml | 20 +++
drivers/memory/mtk-smi.c | 141 +++++++++++++++++-
3 files changed, 159 insertions(+), 4 deletions(-)
--
2.46.0
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