linux-kernel - Re: [PATCH 01/12] drm/msm/dsi/phy: Add support for Kaanapali

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Message-ID: <c7c26f26-4e18-4f54-8c88-69ce97345e86@oss.qualcomm.com>
Date: Wed, 29 Oct 2025 10:48:33 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: yuanjiey <yuanjie.yang@....qualcomm.com>,
        Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
Cc: robin.clark@....qualcomm.com, lumag@...nel.org, abhinav.kumar@...ux.dev,
        sean@...rly.run, marijn.suijten@...ainline.org, airlied@...il.com,
        simona@...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_mkrishn@...cinc.com, jonathan@...ek.ca,
        quic_khsieh@...cinc.com, neil.armstrong@...aro.org,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, tingwei.zhang@....qualcomm.com,
        aiqun.yu@....qualcomm.com, yongxing.mou@....qualcomm.com
Subject: Re: [PATCH 01/12] drm/msm/dsi/phy: Add support for Kaanapali

On 10/29/25 4:19 AM, yuanjiey wrote:
> On Mon, Oct 27, 2025 at 03:29:40PM +0200, Dmitry Baryshkov wrote:
>> On Mon, Oct 27, 2025 at 02:20:26PM +0100, Konrad Dybcio wrote:
>>> On 10/27/25 2:14 PM, Dmitry Baryshkov wrote:
>>>> On Fri, Oct 24, 2025 at 11:27:53AM +0800, yuanjiey wrote:
>>>>> On Thu, Oct 23, 2025 at 02:02:45PM +0200, Konrad Dybcio wrote:
>>>>>> On 10/23/25 1:48 PM, Dmitry Baryshkov wrote:
>>>>>>> On Thu, Oct 23, 2025 at 03:53:50PM +0800, yuanjie yang wrote:
>>>>>>>> From: Yuanjie Yang <yuanjie.yang@....qualcomm.com>
>>>>>>>>
>>>>>>>> Add DSI PHY support for the Kaanapali platform.
>>>>>>>>
>>>>>>>> Signed-off-by: Yongxing Mou <yongxing.mou@....qualcomm.com>
>>>>>>>> Signed-off-by: Yuanjie Yang <yuanjie.yang@....qualcomm.com>
>>>>>>>> ---
>>>>>>
>>>>>> [...]
>>>>>>
>>>>>>>> +	.io_start = { 0x9ac1000, 0xae97000 },
>>>>>>>
>>>>>>> These two addresses are very strange. Would you care to explain? Other
>>>>>>> than that there is no difference from SM8750 entry.
>>>>>>
>>>>>> They're correct.
>>>>>> Although they correspond to DSI_0 and DSI_2..
>>>>>>
>>>>>> Yuanjie, none of the DSI patches mention that v2.10.0 is packed with
>>>>>> new features. Please provide some more context and how that impacts
>>>>>> the hw description.
>>>>>
>>>>> Thanks for your reminder.
>>>>>
>>>>> Correct here:
>>>>> io_start = { 0x9ac1000, 0x9ac4000 }  DSI_Phy0 DSI_phy1
>>>>>
>>>>> And v2.10.0 no clearly meaningful changes compared to v2.9.0.
>>>>> just some register address change.
>>>>
>>>> Addition of DSI2 is a meaningful change, which needs to be handled both
>>>> in the core and in the DSI / DSI PHY drivers.
>>>
>>> DSI2 was introduced in 8750 already, but it was done without any
>>> fanfare..
>>>
>>> I see a diagram that shows an XBAR with inputs from DSI0 and DSI2,
>>> and an output to DSI0_PHY (same thing on kaanapali - meaning this
>>> patch is potentially wrong and should ref DSI1_PHY instead?)
>>
> Yes, I check ipcata Doc, I see DSI0\DSI0_PHY DSI1\DSI1_PHY DSI2\DSI2_PHY in Kaanapali, 
> addition of DSI2\DSI2_PHY compared to SM8650.
> 
> look like I should add: config io_start = {DSI0_PHY, DSI1_PHY, DSI2_PHY},
> 
> Do you thinks this fix is OK?

The MDSS documentation says there are only two DSI PHYs, so perhaps one
is not exactly implemented. Let's get confirmation of which one that is
and keep the two functional ones.

Konrad