Re: [PATCH V2] thunderbolt: Fix Thunderbolt 3 display flickering issue on 2nd hot plug onwards

[Mika Westerberg <mika.westerberg@linux.intel.com>]

On Wed, Jul 12, 2023 at 01:16:19PM -0500, Sanjay R Mehta wrote:
> Previously, on unplug events, the TMU mode was disabled first
> followed by the Time Synchronization Handshake, irrespective of
> whether the tb_switch_tmu_rate_write() API was successful or not.
> 
> However, this caused a problem with Thunderbolt 3 (TBT3)
> devices, as the TSPacketInterval bits were always enabled by default,
> leading the host router to assume that the device router's TMU was
> already enabled and preventing it from initiating the Time
> Synchronization Handshake. As a result, TBT3 monitors experienced
> display flickering from the second hot plug onwards.
> 
> To address this issue, we have modified the code to only disable the
> Time Synchronization Handshake during TMU disable if the
> tb_switch_tmu_rate_write() function is successful. This ensures that
> the TBT3 devices function correctly and eliminates the display
> flickering issue.
> 
> Co-developed-by: Sanath S <Sanath.S@amd.com>
> Signed-off-by: Sanath S <Sanath.S@amd.com>
> Signed-off-by: Sanjay R Mehta <sanju.mehta@amd.com>

Looks good.

I suppose you want this in -stable too, right?