linux-kernel - Re: [PATCH 1/4] drm/msm/dp: Update msm_dp

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Message-ID: <7f61ee13-c73f-4b5b-918d-288368ac2cdc@oss.qualcomm.com>
Date: Fri, 26 Sep 2025 13:19:32 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Mani Chandana Ballary Kuntumalla <quic_mkuntuma@...cinc.com>,
        dmitry.baryshkov@....qualcomm.com, marijn.suijten@...ainline.org,
        swboyd@...omium.org, mripard@...nel.org, abel.vesa@...aro.org,
        andersson@...nel.org, konradybcio@...nel.org, robh@...nel.org,
        krzk+dt@...nel.org, conor+dt@...nel.org, robin.clark@....qualcomm.com,
        jessica.zhang@....qualcomm.com, abhinav.kumar@...ux.dev,
        sean@...rly.run, airlied@...il.com, simona@...ll.ch,
        alex.vinarskis@...il.com
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        freedreno@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        quic_rajeevny@...cinc.com, quic_vproddut@...cinc.com,
        quic_riteshk@...cnic.com, quic_amitsi@...cnic.com
Subject: Re: [PATCH 1/4] drm/msm/dp: Update msm_dp_controller IDs for sa8775p

On 9/26/25 1:18 PM, Konrad Dybcio wrote:
> On 9/26/25 10:59 AM, Mani Chandana Ballary Kuntumalla wrote:
>> The Qualcomm SA8775P platform comes with 2 DisplayPort controllers
>> for each mdss. Update controller id for DPTX0 and DPTX1 of mdss1.
>>
>> Signed-off-by: Mani Chandana Ballary Kuntumalla <quic_mkuntuma@...cinc.com>
>> ---
>>  drivers/gpu/drm/msm/dp/dp_display.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
>> index d87d47cc7ec3..f247aad55397 100644
>> --- a/drivers/gpu/drm/msm/dp/dp_display.c
>> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
>> @@ -133,8 +133,8 @@ struct msm_dp_desc {
>>  static const struct msm_dp_desc msm_dp_desc_sa8775p[] = {
>>  	{ .io_start = 0x0af54000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true },
>>  	{ .io_start = 0x0af5c000, .id = MSM_DP_CONTROLLER_1, .wide_bus_supported = true },
>> -	{ .io_start = 0x22154000, .id = MSM_DP_CONTROLLER_2, .wide_bus_supported = true },
>> -	{ .io_start = 0x2215c000, .id = MSM_DP_CONTROLLER_3, .wide_bus_supported = true },
>> +	{ .io_start = 0x22154000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true },
>> +	{ .io_start = 0x2215c000, .id = MSM_DP_CONTROLLER_1, .wide_bus_supported = true },
> 
> Well, did you see what happens when you try to plug in a display
> to a controller on MDSS0 and MDSS1 at once now?
> 
> (memory corruption)

No, my bad. I misread the code

Konrad