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

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Message-ID: <pzwwlv4epiy36t7k66ymhbcetyz47tzvx2kxwmbqzdn7kygori@gwwxchq52mkw>
Date: Tue, 23 Sep 2025 12:03:53 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Hermes.wu@....com.tw
Cc: Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
        Allen Chen <allen.chen@....com.tw>, Pet.Weng@....com.tw,
        Kenneth.Hung@....com.tw, treapking@...omium.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/4] drm/bridge: it6505: add INT status check while
 link auto training

On Tue, Sep 23, 2025 at 02:23:42PM +0800, Hermes Wu via B4 Relay wrote:
> From: Hermes Wu <Hermes.wu@....com.tw>
> 
> 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@....com.tw>
> ---
>  drivers/gpu/drm/bridge/ite-it6505.c | 38 ++++++++++++++++++++++++++-----------
>  1 file changed, 27 insertions(+), 11 deletions(-)
> 

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


-- 
With best wishes
Dmitry