Re: [PATCH v4 2/4] drm/bridge: it6505: add INT status check while link auto training

[Dmitry Baryshkov]

On Tue, Sep 23, 2025 at 02:23:42PM +0800, Hermes Wu via B4 Relay wrote:
> From: Hermes Wu <Hermes.wu@xxxxxxxxxx>
> 
> When start link training, interrupt status INT_LINK_TRAIN_FAIL can use to
> check link training fail and no need to wait until timeout.
> 
> it6505_irq_link_train_fail() remove from interrupt and no longer used.
> 
> IT6505 HW auto link training which will write DPCD and check training
> status automatically.
> 
> In the case that driver set link rate at 2.7G and HW fail to training,
> it will change link configuration and try 1.65G. And this will cause
> INT_VID_FIFO_ERROR triggered when link clock is changed.
> 
> When video error occurs, video logic is reset and link training restart,
> this will cause endless auto link training.
> 
> when start  link auto training, disable INT_VID_FIFO_ERROR to avoid loop
> and check INT_LINK_TRAIN_FAIL event to abort wait training done.
> 
> Signed-off-by: Hermes Wu <Hermes.wu@xxxxxxxxxx>
> ---
>  drivers/gpu/drm/bridge/ite-it6505.c | 38 ++++++++++++++++++++++++++-----------
>  1 file changed, 27 insertions(+), 11 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>


-- 
With best wishes
Dmitry