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Date: Thu, 22 Jul 2021 19:08:03 +0000 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 v2 3/7] drm/msm/dp: reset aux controller after dp_aux_cmd_fifo_tx() failed. Quoting Kuogee Hsieh (2021-07-13 08:54:03) > Aux hardware calibration sequence requires resetting the aux controller > in order for the new setting to take effect. However resetting the AUX > controller will also clear HPD interrupt status which may accidentally > cause pending unplug interrupt to get lost. Therefore reset aux > controller only when link is in connection state when dp_aux_cmd_fifo_tx() > fail. This fixes Link Layer CTS cases 4.2.1.1 and 4.2.1.2. > > Signed-off-by: Kuogee Hsieh <khsieh@...eaurora.org> > --- Reviewed-by: Stephen Boyd <swboyd@...omium.org>
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