On Sat, 2025-02-22 at 10:45 +0100, Krzysztof Kozlowski wrote:

External email : Please do not click links or open attachments until
you have verified the sender or the content.


On Fri, Feb 21, 2025 at 03:48:30PM +0800, Friday Yang wrote:

quoted

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-

That's not a valid link. Fix your email client.

Sorry for the inconvenience. The Web link is quite long, so I have
split it into two lines. Please copy the entire link and paste it into
the browser, it sholuld work. 

Best regards,
Krzysztof