linux-kernel - Re: [PATCH v6 1/2] drm/msm/dp: handle irq_hpd with sink

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Date:   Fri, 21 May 2021 15:15:09 -0700
From:   khsieh@...eaurora.org
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     agross@...nel.org, bjorn.andersson@...aro.org, robdclark@...il.com,
        sean@...rly.run, vkoul@...nel.org, abhinavk@...eaurora.org,
        aravindh@...eaurora.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 1/2] drm/msm/dp: handle irq_hpd with sink_count = 0
 correctly

On 2021-05-21 14:56, Stephen Boyd wrote:
> Quoting Kuogee Hsieh (2021-05-19 13:22:33)
>> irq_hpd interrupt should be handled after dongle plugged in and
>> before dongle unplugged. Hence irq_hpd interrupt is enabled at
>> the end of the plugin handle and disabled at the beginning of
>> unplugged handle. Current irq_hpd with sink_count = 0 is wrongly
>> handled same as the dongle unplugged which tears down the mainlink
>> and disables the phy. This patch fixes this problem by only tearing
>> down the mainlink but keeping phy enabled at irq_hpd with
>> sink_count = 0 handle so that next irq_hpd with sink_count =1 can be
>> handled by setup mainlink only. This patch also set dongle into D3
>> (power off) state at end of handling irq_hpd with sink_count = 0.
>> 
>> Changes in v2:
>> -- add ctrl->phy_Power_count
>> 
>> Changes in v3:
>> -- del ctrl->phy_Power_count
>> -- add phy_power_off to dp_ctrl_off_link_stream()
>> 
>> Changes in v4:
>> -- return immediately if clock disable failed at 
>> dp_ctrl_off_link_stream()
>> 
>> Changes in v5:
>> -- set dongle to D3 (power off) state at dp_ctrl_off_link_stream()
>> 
>> Changes in v6:
>> -- add Fixes tag
>> 
>> Fixes: 94e58e2d06e3 ("drm/msm/dp: reset dp controller only at boot up 
>> and pm_resume")
>> 
>> Signed-off-by: Kuogee Hsieh <khsieh@...eaurora.org>
>> ---
> 
> Tested-by: Stephen Boyd <swboyd@...omium.org>
> Reviewed-by: Stephen Boyd <swboyd@...omium.org>
> 
> We can resolve the lingering dual irq issue later on if you don't want
> to send another round of this. Also, the title says 1/2 so I wonder if
> there's another patch? Doesn't look like there is but I have to ask. If
> not, please generate patches with the right -<N> argument or revision
> range.
ok, thanks,
Sorry, the 2nd patch is the xlog debug patch.
I did not submit it.