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From: khsieh@codeaurora.org
To: Stephen Boyd <swboyd@chromium.org>
Cc: dri-devel@lists.freedesktop.org, robdclark@gmail.com,
	sean@poorly.run, abhinavk@codeaurora.org,
	aravindh@codeaurora.org, airlied@linux.ie, daniel@ffwll.ch,
	bjorn.andersson@linaro.org, linux-arm-msm@vger.kernel.org,
	freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 5/7] drm/msm/dp: return correct edid checksum after corrupted edid checksum read
Date: Thu, 29 Jul 2021 09:17:45 -0700	[thread overview]
Message-ID: <ef1a1d24e0afe5455d841054660f1e3c@codeaurora.org> (raw)
In-Reply-To: <CAE-0n539r5zQx7zX9bECspKUAypQ8VucgeMNTmqAjHOCemVmOg@mail.gmail.com>

On 2021-07-22 12:23, Stephen Boyd wrote:
> Quoting Kuogee Hsieh (2021-07-13 08:54:05)
>> diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c 
>> b/drivers/gpu/drm/msm/dp/dp_panel.c
>> index 88196f7..0fdb551 100644
>> --- a/drivers/gpu/drm/msm/dp/dp_panel.c
>> +++ b/drivers/gpu/drm/msm/dp/dp_panel.c
>> @@ -303,7 +303,12 @@ void dp_panel_handle_sink_request(struct dp_panel 
>> *dp_panel)
>>         panel = container_of(dp_panel, struct dp_panel_private, 
>> dp_panel);
>> 
>>         if (panel->link->sink_request & DP_TEST_LINK_EDID_READ) {
>> -               u8 checksum = 
>> dp_panel_get_edid_checksum(dp_panel->edid);
>> +               u8 checksum;
>> +
>> +               if (dp_panel->edid)
>> +                       checksum = 
>> dp_panel_get_edid_checksum(dp_panel->edid);
>> +               else
>> +                       checksum = 
>> dp_panel->connector->real_edid_checksum;
> 
> Is there any reason why we can't use connector->real_edid_checksum all
> the time?
> 
real_edid_checksum only calculated by drm when edid checksum 
vitrification failed after edid read.
In the good edid checksum case (edid verification succeed), 
real_edid_checksum is not calculated by drm.
>> 
>>                 dp_link_send_edid_checksum(panel->link, checksum);
>>                 dp_link_send_test_response(panel->link);

  reply	other threads:[~2021-07-29 16:18 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-13 15:54 [PATCH v2 0/7] add fixes to pass DP Link Layer compliance test cases Kuogee Hsieh
2021-07-13 15:54 ` [PATCH v2 1/7] drm/msm/dp: use dp_ctrl_off_link_stream during PHY compliance test run Kuogee Hsieh
2021-07-22 19:01   ` Stephen Boyd
2021-07-13 15:54 ` [PATCH v2 2/7] drm/msm/dp: reduce link rate if failed at link training 1 Kuogee Hsieh
2021-07-22 19:05   ` Stephen Boyd
2021-07-13 15:54 ` [PATCH v2 3/7] drm/msm/dp: reset aux controller after dp_aux_cmd_fifo_tx() failed Kuogee Hsieh
2021-07-22 19:08   ` Stephen Boyd
2021-07-13 15:54 ` [PATCH v2 4/7] drm/msm/dp: replug event is converted into an unplug followed by an plug events Kuogee Hsieh
2021-07-22 19:24   ` Stephen Boyd
2021-07-13 15:54 ` [PATCH v2 5/7] drm/msm/dp: return correct edid checksum after corrupted edid checksum read Kuogee Hsieh
2021-07-22 19:23   ` Stephen Boyd
2021-07-29 16:17     ` khsieh [this message]
2021-07-13 15:54 ` [PATCH v2 6/7] drm/msm/dp: do not end dp link training until video is ready Kuogee Hsieh
2021-07-22 19:15   ` Stephen Boyd
2021-07-13 15:54 ` [PATCH v2 7/7] drm/msm/dp: retrain link when loss of symbol lock detected Kuogee Hsieh
2021-07-22 19:14   ` Stephen Boyd

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