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Date: Tue, 10 Aug 2021 14:35:54 -0700 From: Stephen Boyd <swboyd@...omium.org> To: Kuogee Hsieh <khsieh@...eaurora.org>, dri-devel@...ts.freedesktop.org, robdclark@...il.com, sean@...rly.run Cc: abhinavk@...eaurora.org, aravindh@...eaurora.org, airlied@...ux.ie, daniel@...ll.ch, bjorn.andersson@...aro.org, linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v3 6/6] drm/msm/dp: do not end dp link training until video is ready Quoting Kuogee Hsieh (2021-08-05 13:44:55) > Initialize both pre-emphasis and voltage swing level to 0 before > start link training and do not end link training until video is > ready to reduce the period between end of link training and video > start to meet Link Layer CTS requirement. Some dongle main link > symbol may become unlocked again if host did not end link training > soon enough after completion of link training 2. Host have to re > train main link if loss of symbol locked detected before end link > training so that the coming video stream can be transmitted to sink > properly. This fixes Link Layer CTS cases 4.3.2.1, 4.3.2.2, 4.3.2.3 > and 4.3.2.4. > > Changes in v3: > -- merge retrain link if loss of symbol locked happen into this patch > -- replace dp_ctrl_loss_symbol_lock() with dp_ctrl_channel_eq_ok() > > Signed-off-by: Kuogee Hsieh <khsieh@...eaurora.org> > --- Reviewed-by: Stephen Boyd <swboyd@...omium.org>
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