Re: [PATCH RESEND v5 0/4] i2c: designware: Improve device disable handling

[Mika Westerberg]

Hi,

On Wed, May 27, 2026 at 08:09:48PM +0000, William A. Kennington III wrote:
> When the I2C controller attempts a new transaction while the target
> controller is shutting down or restarting, it can lead to bus lockups
> and system bootloops if the hardware enters an inconsistent state.
> 
> This patch series addresses this by ensuring that the internal state
> machines are properly cleared when disabling the controller if target
> activity is detected.
> 
> Additionally, it adds a shutdown hook that gracefully sets the target
> disable bit before disabling the controller. This guarantees that any
> incoming requests from the controller are immediately NACKed during
> shutdown, preventing the bus from hanging.
> 
> Signed-off-by: William A. Kennington III <william@xxxxxxxxxxxxxxx>
> ---
> Changes in v5:
> - Fixed one last inclusive language mistake
> - Link to v4: https://lore.kernel.org/r/20260507-dw-i2c-v4-0-9a447b23bfdf@xxxxxxxxxxxxxxx
> Changes in v4:
> - Updated language to use inclusive terms
> - Refactored some minor comment / code nits
> - Link to v3: https://lore.kernel.org/r/20260504-dw-i2c-v3-0-57e56135d602@xxxxxxxxxxxxxxx
> Changes in v3:
> - Split the monolithic patch into 4 logical patches
> - Reverted stray formatting change in the PCI driver's dw_i2c_driver struct.
> Changes in v2:
> - Fix description footers
> - Fix emails
> 
> ---
> William A. Kennington III (4):
>       i2c: designware: Introduce shutdown exported function
>       i2c: designware: Convert PCI driver to use shutdown hook
>       i2c: designware: Convert platform driver to use shutdown hook
>       i2c: designware: Handle active target cleanly

For the series,

Acked-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>