linux-kernel - Re: [PATCH 5/5] drm/msm/dp: Add DisplayPort controller for SA8775P

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Message-ID: <b2d94fa5-6924-46f6-95cf-bde315ccbdbd@quicinc.com>
Date: Tue, 17 Sep 2024 13:42:54 +0530
From: Soutrik Mukhopadhyay <quic_mukhopad@...cinc.com>
To: Bjorn Andersson <quic_bjorande@...cinc.com>
CC: <vkoul@...nel.org>, <kishon@...nel.org>, <konradybcio@...nel.org>,
        <andersson@...nel.org>, <simona@...ll.ch>,
        <dmitry.baryshkov@...aro.org>, <abel.vesa@...aro.org>,
        <robdclark@...il.com>, <quic_abhinavk@...cinc.com>, <sean@...rly.run>,
        <marijn.suijten@...ainline.org>, <airlied@...il.com>,
        <daniel@...ll.ch>, <maarten.lankhorst@...ux.intel.com>,
        <mripard@...nel.org>, <tzimmermann@...e.de>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <quic_khsieh@...cinc.com>,
        <konrad.dybcio@...aro.org>, <quic_parellan@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-phy@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <quic_riteshk@...cinc.com>, <quic_vproddut@...cinc.com>
Subject: Re: [PATCH 5/5] drm/msm/dp: Add DisplayPort controller for SA8775P


On 9/14/2024 2:54 AM, Bjorn Andersson wrote:
> On Thu, Sep 12, 2024 at 03:34:05PM +0530, Soutrik Mukhopadhyay wrote:
>> On 9/12/2024 1:32 AM, Bjorn Andersson wrote:
>>> On Wed, Sep 11, 2024 at 03:38:13PM +0530, Soutrik Mukhopadhyay wrote:
>>>> The Qualcomm SA8775P platform comes with a DisplayPort controller
>>>> with a different base offset than the previous SoCs,
>>>> add support for this in the DisplayPort driver.
> Please check the line wrapping of this as well; the lines here should be
> wrapped at 75 columns.


Yes, it is within 75 columns, we ran checkpatch.pl before posting the patch.


>
>>>> Signed-off-by: Soutrik Mukhopadhyay <quic_mukhopad@...cinc.com>
>>>> ---
>>>>    drivers/gpu/drm/msm/dp/dp_display.c | 7 +++++++
>>>>    1 file changed, 7 insertions(+)
>>>>
>>>> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
>>>> index e1228fb093ee..e4954fd99eb0 100644
>>>> --- a/drivers/gpu/drm/msm/dp/dp_display.c
>>>> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
>>>> @@ -118,6 +118,12 @@ struct msm_dp_desc {
>>>>    	bool wide_bus_supported;
>>>>    };
>>>> +static const struct msm_dp_desc sa8775p_dp_descs[] = {
>>>> +	{ .io_start = 0xaf54000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true },
>>>> +	{ .io_start = 0xaf5c000, .id = MSM_DP_CONTROLLER_1, .wide_bus_supported = true },
>>> Why is this list incomplete?
>>>
>>> Regards,
>>> Bjorn
>>
>> Do you mean to add for mdss_1 as well?
>>
> I don't see a reason for not submitting them as well.


Sure, we will add for mdss_1 as well.


>
>> We only added dp controllers for mdss_0 as we plan to validate and enable
>> only these.
>>
> As far as I can tell there are 5 DPTX blocks on mdss_0.
>
>
> It is perfectly fine that you just state in the commit message that
> "Only MDSS0 DPTX0 and DPTX1 have been validated", but please add the
> others as well in this commit.
>
> Regards,
> Bjorn


We cross-checked the mdss architecture and found that there are only 2 
dp controllers for each mdss.

We will add all 4 and mention in the commit message that "Only MDSS0 
DPTX0 and DPTX1 have been validated".


>
>>>> +	{}
>>>> +};
>>>> +
>>>>    static const struct msm_dp_desc sc7180_dp_descs[] = {
>>>>    	{ .io_start = 0x0ae90000, .id = MSM_DP_CONTROLLER_0, .wide_bus_supported = true },
>>>>    	{}
>>>> @@ -162,6 +168,7 @@ static const struct msm_dp_desc x1e80100_dp_descs[] = {
>>>>    };
>>>>    static const struct of_device_id dp_dt_match[] = {
>>>> +	{ .compatible = "qcom,sa8775p-dp", .data = &sa8775p_dp_descs },
>>>>    	{ .compatible = "qcom,sc7180-dp", .data = &sc7180_dp_descs },
>>>>    	{ .compatible = "qcom,sc7280-dp", .data = &sc7280_dp_descs },
>>>>    	{ .compatible = "qcom,sc7280-edp", .data = &sc7280_dp_descs },
>>>> -- 
>>>> 2.17.1
>>>>