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

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Message-ID: <mlhohop2uifsdo3qxxzmuxbkjo735hdw6xcosvkmsx4eskfufz@5otklefey5k7>
Date: Thu, 30 Oct 2025 20:01:10 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: yuanjiey <yuanjie.yang@....qualcomm.com>
Cc: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        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 Wed, Oct 29, 2025 at 11:19:36AM +0800, 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},

I see DSI0, DSI1, DSI2, but DSI0_PHY and DSI1_PHY.

-- 
With best wishes
Dmitry